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Visual C++

ChangeLog：源码内容

2006-12-20 Ross Johnson <ross.johnson@homemail.com.au>
* sem_destroy.c: Fix the race involving invalidation of the sema;
fix incorrect return of EBUSY resulting from the mutex trylock
on the private mutex guard.
* sem_wait.c: Add check for invalid sem_t after acquiring the
sem_t state guard mutex and before affecting changes to sema state.
* sem_trywait.c: Likewise.
* sem_timedwait.c: Likewise.
* sem_getvalue.c: Likewise.
* sem_post.c: Similar.
* sem_post_multiple.c: Likewise.
* sem_init.c: Set max Win32 semaphore count to SEM_VALUE_MAX (was
_POSIX_SEM_VALUE_MAX, which is a lower value - the minimum).
* pthread_win32_attach_detach_np.c (pthread_win32_process_attach_np): Load COREDLL.DLL under WINCE to check existence of InterlockedCompareExchange() routine. This used to be done to test for TryEnterCriticalSection() but was removed when this was no longer needed.
2006-01-25 Prashant Thakre <prashant.thakre at gmail.com>
* pthread_cancel.c: Added _M_IA64 register context support.
2005-05-13 Ross Johnson <ross at callisto.canberra.edu.au>
* pthread_kill.c (pthread_kill): Remove check for Win32 thread
priority (to confirm HANDLE validity). Useless since thread HANDLEs
a not recycle-unique.
2005-05-30 Vladimir Kliatchko <vladimir at kliatchko.com>
* pthread_once.c: Re-implement using an MCS queue-based lock. The form
of pthread_once is as proposed by Alexander Terekhov (see entry of
2005-03-13). The MCS lock implementation does not require a unique
'name' to identify the lock between threads. Attempts to get the Event
or Semaphore based versions of pthread_once to a satisfactory level
of robustness have thus far failed. The last problem (avoiding races
involving non recycle-unique Win32 HANDLEs) was giving everyone
grey hair trying to solve it.
* ptw32_MCS_lock.c: New MCS queue-based lock implementation. These
locks are efficient: they have very low overhead in the uncontended case;
are efficient in contention and minimise cache-coherence updates in
managing the user level FIFO queue; do not require an ABI change in the
library.
2005-05-27 Alexander Gottwald <alexander.gottwald at s1999.tu-chemnitz.de>
* pthread.h: Some things, like HANDLE, were only defined if
PTW32_LEVEL was >= 3. They should always be defined.
2005-05-25 Vladimir Kliatchko <vladimir at kliatchko.com>
* pthread_once.c: Eliminate all priority operations and other
complexity by replacing the event with a semaphore. The advantage
of the change is the ability to release just one waiter if the
init_routine thread is cancelled yet still release all waiters when
done. Simplify once_control state checks to improve efficiency
further.
2005-05-24 Mikael Magnusson <mikaelmagnusson at glocalnet.net>
* GNUmakefile: Patched to allow cross-compile with mingw32 on Linux.
It uses macros instead of referencing dlltool, gcc and g++ directly;
added a call to ranlib. For example the GC static library can be
built with:
make CC=i586-mingw32msvc-gcc RC=i586-mingw32msvc-windres
RANLIB=i586-mingw32msvc-ranlib clean GC-static
2005-05-13 Ross Johnson <ross at callisto.canberra.edu.au>
* pthread_win32_attach_detach_np.c (pthread_win32_thread_detach_np):
Move on-exit-only stuff from ptw32_threadDestroy() to here.
* ptw32_threadDestroy.c: It's purpose is now only to reclaim thread
resources for detached threads, or via pthread_join() or
pthread_detach() on joinable threads.
* ptw32_threadStart.c: Calling user destruct routines has moved to
pthread_win32_thread_detach_np(); call pthread_win32_thread_detach_np()
directly if statically linking, otherwise do so via dllMain; store
thread return value in thread struct for all cases, including
cancellation and exception exits; thread abnormal exits go via
pthread_win32_thread_detach_np.
* pthread_join.c (pthread_join): Don't try to get return code from
Win32 thread - always get it from he thread struct.
* pthread_detach.c (pthread_detach): reduce extent of the thread
existence check since we now don't care if the Win32 thread HANDLE has
been closed; reclaim thread resources if the thread has exited already.
* ptw32_throw.c (ptw32_throw): For Win32 threads that are not implicit,
only Call thread cleanup if statically linking, otherwise leave it to
dllMain.
* sem_post.c (_POSIX_SEM_VALUE_MAX): Change to SEM_VALUE_MAX.
* sem_post_multiple.c: Likewise.
* sem_init.c: Likewise.
2005-05-10 Ross Johnson <ross at callisto.canberra.edu.au>
* pthread_join.c (pthread_join): Add missing check for thread ID
reference count in thread existence test; reduce extent of the
existence test since we don't care if the Win32 thread HANDLE has
been closed.
2005-05-09 Ross Johnson <ross at callisto.canberra.edu.au>
* ptw32_callUserDestroyRoutines.c: Run destructor process (i.e.
loop over all keys calling destructors) up to
PTHREAD_DESTRUCTOR_ITERATIONS times if TSD value isn't NULL yet;
modify assoc management.
* pthread_key_delete.c: Modify assoc management.
* ptw32_tkAssocDestroy.c: Fix error in assoc removal from chains.
* pthread.h
(_POSIX_THREAD_DESTRUCTOR_ITERATIONS): Define to value specified by
POSIX.
(_POSIX_THREAD_KEYS_MAX): Define to value specified by POSIX.
(PTHREAD_KEYS_MAX): Redefine [upward] to minimum required by POSIX.
(SEM_NSEMS_MAX): Define to implementation value.
(SEM_VALUE_MAX): Define to implementation value.
(_POSIX_SEM_NSEMS_MAX): Redefine to value specified by POSIX.
(_POSIX_SEM_VALUE_MAX): Redefine to value specified by POSIX.
2005-05-06 Ross Johnson <ross at callisto.canberra.edu.au>
* signal.c (sigwait): Add a cancellation point to this otherwise
no-op.
* sem_init.c (sem_init): Check for and return ERANGE error.
* sem_post.c (sem_post): Likewise.
* sem_post_multiple.c (sem_post_multiple): Likewise.
* manual (directory): Added; see ChangeLog inside.
2005-05-02 Ross Johnson <ross at callisto.canberra.edu.au>
* implement.h (struct pthread_key_t_): Change threadsLock to keyLock
so as not to be confused with the per thread lock 'threadlock';
change all references to it.
* implement.h (struct ThreadKeyAssoc): Remove lock; add prevKey
and prevThread pointers; re-implemented all routines that use this
struct. The effect of this is to save one handle per association,
which could potentially equal the number of keys multiplied by the
number of threads, accumulating over time - and to free the
association memory as soon as it is no longer referenced by either
the key or the thread. Previously, the handle and memory were
released only after BOTH key and thread no longer referenced the
association. That is, often no association resources were released
until the process itself exited. In addition, at least one race
condition has been removed - where two threads could attempt to
release the association resources simultaneously - one via
ptw32_callUserDestroyRoutines and the other via
pthread_key_delete.
- thanks to Richard Hughes at Aculab for discovering the problem.
* pthread_key_create.c: See above.
* pthread_key_delete.c: See above.
* pthread_setspecific.c: See above.
* ptw32_callUserDestroyRoutines.c: See above.
* ptw32_tkAssocCreate.c: See above.
* ptw32_tkAssocDestroy.c: See above.
2005-04-27 Ross Johnson <ross at callisto.canberra.edu.au>
* sem_wait.c (ptw32_sem_wait_cleanup): after cancellation re-attempt
to acquire the semaphore to avoid a race with a late sem_post.
* sem_timedwait.c: Modify comments.
2005-04-25 Ross Johnson <ross at callisto.canberra.edu.au>
* ptw32_relmillisecs.c: New module; converts future abstime to
milliseconds relative to 'now'.
* pthread_mutex_timedlock.c: Use new ptw32_relmillisecs routine in
place of internal code; remove the NEED_SEM code - this routine is now
implemented for builds that define NEED_SEM (WinCE etc)
* sem_timedwait.c: Likewise; after timeout or cancellation,
re-attempt to acquire the semaphore in case one has been posted since
the timeout/cancel occurred. Thanks to Stefan Mueller.
* Makefile: Add ptw32_relmillisecs.c module; remove
ptw32_{in,de}crease_semaphore.c modules.
* GNUmakefile: Likewise.
* Bmakefile: Likewise.
* sem_init.c: Re-write the NEED_SEM code to be consistent with the
non-NEED_SEM code, but retaining use of an event in place of the w32 sema
for w32 systems that don't include semaphores (WinCE);
the NEED_SEM versions of semaphores has been broken for a long time but is
now fixed and supports all of the same routines as the non-NEED_SEM case.
* sem_destroy.c: Likewise.
* sem_wait.c: Likewise.
* sem_post.c: Likewise.
* sem_post_multple.c: Likewise.
* implement.h: Likewise.
* sem_timedwait.c: Likewise; this routine is now
implemented for builds that define NEED_SEM (WinCE etc).
* sem_trywait.c: Likewise.
* sem_getvalue.c: Likewise.
* pthread_once.c: Yet more changes, reverting closer to Gottlob Frege's
first design, but retaining cancellation, priority boosting, and adding
preservation of W32 error codes to make pthread_once transparent to
GetLastError.
2005-04-11 Ross Johnson <ross at callisto.canberra.edu.au>
* pthread_once.c (pthread_once): Added priority boosting to
solve starvation problem after once_routine cancellation.
See notes in file.
2005-04-06 Kevin Lussier <Kevin at codegreennetworks.com>
* Makefile: Added debug targets for all versions of the library.
2005-04-01 Ross Johnson <ross at callisto.canberra.edu.au>
* GNUmakefile: Add target to build libpthreadGC1.a as a static link
library.
* Makefile: Likewise for pthreadGC1.lib.
2005-04-01 Kevin Lussier <Kevin at codegreennetworks.com>
* sem_timedwait.c (sem_timedwait): Increase size of temp variables to
avoid int overflows for large timeout values.
* implement.h (int64_t): Include or define.
2005-03-31 Dimitar Panayotov <develop at mail.bg>^M
* pthread.h: Fix conditional defines for static linking.
* sched.h: Liekwise.
* semaphore.h: Likewise.
* dll.c (PTW32_STATIC_LIB): Module is conditionally included
in the build.
2005-03-16 Ross Johnson <ross at callisto.canberra.edu.au>^M
* pthread_setcancelstate.c: Undo the last change.
2005-03-16 Ross Johnson <ross at callisto.canberra.edu.au>^M
* pthread_setcancelstate.c: Don't check for an async cancel event
if the library is using alertable async cancel..
2005-03-14 Ross Johnson <ross at callisto.canberra.edu.au>
* pthread_once.c (pthread_once): Downgrade interlocked operations to simple
memory operations where these are protected by the critical section; edit
comments.
2005-03-13 Ross Johnson <rpj at callisto.canberra.edu.au>
* pthread_once.c (pthread_once): Completely redesigned; a change was
required to the ABI (pthread_once_t_), and resulting in a version
compatibility index increment.
NOTES:
The design (based on pseudo code contributed by Gottlob Frege) avoids
creating a kernel object if there is no contention. See URL for details:-
http://sources.redhat.com/ml/pthreads-win32/2005/msg00029.html
This uses late initialisation similar to the technique already used for
pthreads-win32 mutexes and semaphores (from Alexander Terekhov).
The subsequent cancelation cleanup additions (by rpj) could not be implemented
without sacrificing some of the efficiency in Gottlob's design. In particular,
although each once_control uses it's own event to block on, a global CS is
required to manage it - since the event must be either re-usable or
re-creatable under cancelation. This is not needed in the non-cancelable
design because it is able to mark the event as closed (forever).
When uncontested, a CS operation is equivalent to an Interlocked operation
in speed. So, in the final design with cancelability, an uncontested
once_control operation involves a minimum of five interlocked operations
(including the LeaveCS operation).
ALTERNATIVES:
An alternative design from Alexander Terekhov proposed using a named mutex,
as sketched below:-
if (!once_control) { // May be in TLS
named_mutex::guard guard(&once_control2);
if (!once_control2) {
<init>
once_control2 = true;
}
once_control = true;
}
A more detailed description of this can be found here:-
http://groups.yahoo.com/group/boost/message/15442
[Although the definition of a suitable PTHREAD_ONCE_INIT precludes use of the
TLS located flag, this is not critical.]
There are three primary concerns though:-
1) The [named] mutex is 'created' even in the uncontended case.
2) A system wide unique name must be generated.
3) Win32 mutexes are VERY slow even in the uncontended case. An uncontested
Win32 mutex lock operation can be 50 (or more) times slower than an
uncontested EnterCS operation.
Ultimately, the named mutex trick is making use of the global locks maintained
by the kernel.
* pthread.h (pthread_once_t_): One flag and an event HANDLE added.
(PTHREAD_ONCE_INIT): Additional values included.
2005-03-08 Ross Johnson <rpj at callisto.canberra.edu.au>
* pthread_once.c (pthread_once): Redesigned to elliminate potential
starvation problem.
- reported by Gottlob Frege <gottlobfrege at gmail.com>
* ptw32_threadDestroy.c (ptw32_threadDestroy): Implicit threads were
not closing their Win32 thread duplicate handle.
- reported by Dmitrii Semii <bogolt at gmail.com>
2005-01-25 Ralf Kubis <RKubis at mc.com>
* Attempted acquisition of recursive mutex was causing waiting
threads to not be woken when the mutex is released.
* GNUmakefile (GCE): Generate correct version resource comments.
2005-01-01 Konstantin Voronkov <beowinkle at yahoo.com>
* pthread_mutex_lock.c (pthread_mutex_lock): The new atomic exchange
mutex algorithm is known to allow a thread to steal the lock off
FIFO waiting threads. The next waiting FIFO thread gets a spurious
wake-up and must attempt to re-acquire the lock. The woken thread
was setting itself as the mutex's owner before the re-acquisition.
2004-11-22 Ross Johnson <rpj at callisto.canberra.edu.au>
* pthread_cond_wait.c (ptw32_cond_wait_cleanup): Undo change
from 2004-11-02.
* Makefile (DLL_VER): Added for DLL naming suffix - see README.
* GNUmakefile (DLL_VER): Likewise.
* Wmakefile (DLL_VER): Likewise.
* Bmakefile (DLL_VER): Likewise.
* pthread.dsw (version.rc): Added to MSVS workspace.
2004-11-20 Boudewijn Dekker <b.dekker at ellipsis.nl>
* pthread_getspecific.c (pthread_getspecific): Check for
invalid (NULL) key argument.
2004-11-19 Ross Johnson <rpj at callisto.canberra.edu.au>
* config.h (PTW32_THREAD_ID_REUSE_INCREMENT): Added to allow
building the library for either unique thread IDs like Solaris
or non-unique thread IDs like Linux; allows application developers
to override the library's default insensitivity to some apps
that may not be strictly POSIX compliant.
* version.rc: New resource module to encode version information
within the DLL.
* pthread.h: Added PTW32_VERSION* defines and grouped sections
required by resource compiler together; bulk of file is skipped
if RC_INVOKED. Defined some error numbers and other names for
Borland compiler.
2004-11-02 Ross Johnson <rpj at callisto.canberra.edu.au>
* pthread_cond_wait.c (ptw32_cond_wait_cleanup): Lock CV mutex at
start of cleanup handler rather than at the end.
* implement.h (PTW32_THREAD_REUSE_EMPTY): Renamed from *_BOTTOM.
(ptw32_threadReuseBottom): New global variable.
* global.c (ptw32_threadReuseBottom): Declare new variable.
* ptw32_reuse.c (ptw32_reuse): Change reuse LIFO stack to LILO queue
to more evenly distribute use of reusable thread IDs; use renamed
PTW32_THREAD_REUSE_EMPTY.
* ptw32_processTerminate.c (ptw2_processTerminate): Use renamed
PTW32_THREAD_REUSE_EMPTY.
2004-10-31 Ross Johnson <rpj at callisto.canberra.edu.au>
* implement.h (PThreadState): Add new state value
'PThreadStateCancelPending'.
* pthread_testcancel.c (pthread_testcancel): Use new thread
'PThreadStateCancelPending' state as short cut to avoid entering
kernel space via WaitForSingleObject() call. This was obviated
by user space sema acquisition in sem_wait() and sem_timedwait(),
which are also cancelation points. A call to pthread_testcancel()
was required, which introduced a kernel call, effectively nullifying
any gains made by the user space sem acquisition checks.
* pthread_cancel.c (pthread_cancel): Set new thread
'PThreadStateCancelPending' state.
2004-10-29 Ross Johnson <rpj at callisto.canberra.edu.au>
* implement.h (pthread_t): Renamed to ptw32_thread_t; struct contains
all thread state.
* pthread.h (ptw32_handle_t): New general purpose struct to serve
as a handle for various reusable object IDs - currently only used
by pthread_t; contains a pointer to ptw32_thread_t (thread state)
and a general purpose uint for use as a reuse counter or flags etc.
(pthread_t): typedef'ed to ptw32_handle_t; the uint is the reuse
counter that allows the library to maintain unique POSIX thread IDs.
When the pthread struct reuse stack was introduced, threads would
often acquire an identical ID to a previously destroyed thread. The
same was true for the pre-reuse stack library, by virtue of pthread_t
being the address of the thread struct. The new pthread_t retains
the reuse stack but provides virtually unique thread IDs.
* sem_wait.c (ptw32_sem_wait_cleanup): New routine used for
cancelation cleanup.
* sem_timedwait.c (ptw32_sem_timedwait_cleanup): Likewise.
2004-10-22 Ross Johnson <rpj at callisto.canberra.edu.au>
* sem_init.c (sem_init): Introduce a 'lock' element in order to
replace the interlocked operations with conventional serialisation.
This is needed in order to be able to atomically modify the sema
value and perform Win32 sema release operations. Win32 semaphores are
used instead of events in order to support efficient multiple posting.
If the whole modify/release isn't atomic, a race between
sem_timedwait() and sem_post() could result in a release when there is
no waiting semaphore, which would cause too many threads to proceed.
* sem_wait.c (sem_wait): Use new 'lock'element.
* sem_timedwait.c (sem_timedwait): Likewise.
* sem_trywait.c (sem_trywait): Likewise.
* sem_post.c (sem_post): Likewise.
* sem_post_multiple.c (sem_post_multiple): Likewise.
* sem_getvalue.c (sem_getvalue): Likewise.
* ptw32_semwait.c (ptw32_semwait): Likewise.
* sem_destroy.c (sem_destroy): Likewise; also tightened the conditions
for semaphore destruction; in particular, a semaphore will not be
destroyed if it has waiters.
* sem_timedwait.c (sem_timedwait): Added cancel cleanup handler to
restore sema value when cancelled.
* sem_wait.c (sem_wait): Likewise.
2004-10-21 Ross Johnson <rpj at callisto.canberra.edu.au>
* pthread_mutex_unlock.c (pthread_mutex_unlock): Must use PulseEvent()
rather than SetEvent() to reset the event if there are no waiters.
2004-10-19 Ross Johnson <rpj at callisto.canberra.edu.au>
* sem_init.c (sem_init): New semaphore model based on the same idea
as mutexes, i.e. user space interlocked check to avoid
unnecessarily entering kernel space. Wraps the Win32 semaphore and
keeps it's own counter. Although the motivation to do this has existed
for a long time, credit goes to Alexander Terekhov for providing
the logic. I have deviated slightly from AT's logic to add the waiters
count, which has made the code more complicated by adding cancelation
cleanup. This also appears to have broken the VCE (C++ EH) version of
the library (the same problem as previously reported - see BUGS #2),
only apparently not fixable using the usual workaround, nor by turning
all optimisation off. The GCE version works fine, so it is presumed to
be a bug in MSVC++ 6.0. The cancelation exception is thrown and caught
correctly, but the cleanup class destructor is never called. The failing
test is testssemaphore4.c.
* sem_wait.c (sem_wait): Implemented user space check model.
* sem_post.c (sem_post): Likewise.
* sem_trywait.c (sem_trywait): Likewise.
* sem_timedwait.c (sem_timedwait): Likewise.
* sem_post_multiple.c (sem_post_multiple): Likewise.
* sem_getvalue.c (sem_getvalue): Likewise.
* ptw32_semwait.c (ptw32_semwait): Likewise.
* implement.h (sem_t_): Add counter element.
2004-10-15 Ross Johnson <rpj at callisto.canberra.edu.au>
* implement.h (pthread_mutex_t_): Use an event in place of
the POSIX semaphore.
* pthread_mutex_init.c: Create the event; remove semaphore init.
* pthread_mutex_destroy.c: Delete the event.
* pthread_mutex_lock.c: Replace the semaphore wait with the event wait.
* pthread_mutex_trylock.c: Likewise.
* pthread_mutex_timedlock.c: Likewise.
* pthread_mutex_unlock.c: Set the event.
2004-10-14 Ross Johnson <rpj at callisto.canberra.edu.au>
* pthread_mutex_lock.c (pthread_mutex_lock): New algorithm using
Terekhov's xchg based variation of Drepper's cmpxchg model.
Theoretically, xchg uses fewer clock cycles than cmpxchg (using IA-32
as a reference), however, in my opinion bus locking dominates the
equation on smp systems, so the model with the least number of bus
lock operations in the execution path should win, which is Terekhov's
variant. On IA-32 uni-processor systems, it's faster to use the
CMPXCHG instruction without locking the bus than to use the XCHG
instruction, which always locks the bus. This makes the two variants
equal for the non-contended lock (fast lane) execution path on up
IA-32. Testing shows that the xchg variant is faster on up IA-32 as
well if the test forces higher lock contention frequency, even though
kernel calls should be dominating the times (on up IA-32, both
variants used CMPXCHG instructions and neither locked the bus).
* pthread_mutex_timedlock.c pthread_mutex_timedlock(): Similarly.
* pthread_mutex_trylock.c (pthread_mutex_trylock): Similarly.
* pthread_mutex_unlock.c (pthread_mutex_unlock): Similarly.
* ptw32_InterlockedCompareExchange.c (ptw32_InterlockExchange): New
function.
(PTW32_INTERLOCKED_EXCHANGE): Sets up macro to use inlined
ptw32_InterlockedExchange.
* implement.h (PTW32_INTERLOCKED_EXCHANGE): Set default to
InterlockedExchange().
* Makefile: Building using /Ob2 so that asm sections within inline
functions are inlined.
2004-10-08 Ross Johnson <rpj at callisto.canberra.edu.au>
* pthread_mutex_destroy.c (pthread_mutex_destroy): Critical Section
element is no longer required.
* pthread_mutex_init.c (pthread_mutex_init): Likewise.
* pthread_mutex_lock.c (pthread_mutex_lock): New algorithm following
Drepper's paper at http://people.redhat.com/drepper/futex.pdf, but
using the existing semaphore in place of the futex described in the
paper. Idea suggested by Alexander Terekhov - see:
http://sources.redhat.com/ml/pthreads-win32/2003/msg00108.html
* pthread_mutex_timedlock.c pthread_mutex_timedlock(): Similarly.
* pthread_mutex_trylock.c (pthread_mutex_trylock): Similarly.
* pthread_mutex_unlock.c (pthread_mutex_unlock): Similarly.
* pthread_barrier_wait.c (pthread_barrier_wait): Use inlined version
of InterlockedCompareExchange() if possible - determined at
build-time.
* pthread_spin_destroy.c pthread_spin_destroy(): Likewise.
* pthread_spin_lock.c pthread_spin_lock():Likewise.
* pthread_spin_trylock.c (pthread_spin_trylock):Likewise.
* pthread_spin_unlock.c (pthread_spin_unlock):Likewise.
* ptw32_InterlockedCompareExchange.c: Sets up macro for inlined use.
* implement.h (pthread_mutex_t_): Remove Critical Section element.
(PTW32_INTERLOCKED_COMPARE_EXCHANGE): Set to default non-inlined
version of InterlockedCompareExchange().
* private.c: Include ptw32_InterlockedCompareExchange.c first for
inlining.
* GNUmakefile: Add commandline option to use inlined
InterlockedCompareExchange().
* Makefile: Likewise.
2004-09-27 Ross Johnson <rpj at callisto.canberra.edu.au>
* pthread_mutex_lock.c (pthread_mutex_lock): Separate
PTHREAD_MUTEX_NORMAL logic since we do not need to keep or check some
state required by other mutex types; do not check mutex pointer arg
for validity - leave this to the system since we are only checking
for NULL pointers. This should improve speed of NORMAL mutexes and
marginally improve speed of other type.
* pthread_mutex_trylock.c (pthread_mutex_trylock): Likewise.
* pthread_mutex_unlock.c (pthread_mutex_unlock): Likewise; also avoid
entering the critical section for the no-waiters case, with approx.
30% reduction in lock/unlock overhead for this case.
* pthread_mutex_timedlock.c (pthread_mutex_timedlock): Likewise; also
no longer keeps mutex if post-timeout second attempt succeeds - this
will assist applications that wish to impose strict lock deadlines,
rather than simply to escape from frozen locks.
2004-09-09 Tristan Savatier <tristan at mpegtv.com>
* pthread.h (struct pthread_once_t_): Qualify the 'done' element
as 'volatile'.
* pthread_once.c: Concerned about possible race condition,
specifically on MPU systems re concurrent access to multibyte types.
[Maintainer's note: the race condition is harmless on SPU systems
and only a problem on MPU systems if concurrent access results in an
exception (presumably generated by a hardware interrupt). There are
other instances of similar harmless race conditions that have not
been identified as issues.]
2004-09-09 Ross Johnson <rpj at callisto.canberra.edu.au>
* pthread.h: Declare additional types as volatile.
2004-08-27 Ross Johnson <rpj at callisto.canberra.edu.au>
* pthread_barrier_wait.c (pthread_barrier_wait): Remove excessive code
by substituting the internal non-cancelable version of sem_wait
(ptw32_semwait).
2004-08-25 Ross Johnson <rpj at callisto.canberra.edu.au>
* pthread_join.c (pthread_join): Rewrite and re-order the conditional
tests in an attempt to improve efficiency and remove a race
condition.
2004-08-23 Ross Johnson <rpj at callisto.canberra.edu.au>
* create.c (pthread_create): Don't create a thread if the thread
id pointer location (first arg) is inaccessible. A memory
protection fault will result if the thread id arg isn't an accessible
location. This is consistent with GNU/Linux but different to
Solaris or MKS (and possibly others), which accept NULL as meaning
'don't return the created thread's ID'. Applications that run
using pthreads-win32 will run on all other POSIX threads
implementations, at least w.r.t. this feature.
It was decided not to copy the Solaris et al behaviour because,
although it would have simplified some application porting (but only
from Solaris to Windows), the feature is not technically necessary,
and the alternative segfault behaviour helps avoid buggy application
code.
2004-07-01 Anuj Goyal <anuj.goyal at gmail.com>
* builddmc.bat: New; Windows bat file to build the library.
* config.h (__DMC__): Support for Digital Mars compiler.
* create.c (__DMC__): Likewise.
* pthread_exit.c (__DMC__): Likewise.
* pthread_join.c (__DMC__): Likewise.
* ptw32_threadDestroy.c (__DMC__): Likewise.
* ptw32_threadStart.c (__DMC__): Likewise.
* ptw32_throw.c (__DMC__): Likewise.
2004-06-29 Anuj Goyal <anuj.goyal at gmail.com>
* pthread.h (__DMC__): Initial support for Digital Mars compiler.
2004-06-29 Will Bryant <will.bryant at ecosm.com>
* README.Borland: New; description of Borland changes.
* Bmakefile: New makefile for the Borland make utility.
* ptw32_InterlockedCompareExchange.c:
Add Borland compatible asm code.
2004-06-26 Jason Bard <BardJA at Npt.NUWC.Navy.Mil>
* pthread.h (HAVE_STRUCT_TIMESPEC): If undefined, define it
to avoid timespec struct redefined errors elsewhere in an
application.
2004-06-21 Ross Johnson <rpj at callisto.canberra.edu.au>
* pthread.h (PTHREAD_RECURSIVE_MUTEX_INITIALIZER): Mutex
initialiser added for compatibility with Linux threads and
others; currently not included in SUSV3.
* pthread.h (PTHREAD_ERRORCHECK_MUTEX_INITIALIZER): Likewise.
* pthread.h (PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP): Likewise.
* pthread.h (PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP): Likewise.
* ptw32_mutex_check_need_init.c (ptw32_mutex_check_need_init):
Add new initialisers.
* pthread_mutex_lock.c (pthread_mutex_lock): Check for new
initialisers.
* pthread_mutex_trylock.c (pthread_mutex_trylock): Likewise.
* pthread_mutex_timedlock.c (pthread_mutex_timedlock): Likewise.
* pthread_mutex_unlock.c (pthread_mutex_unlock): Likewise.
* pthread_mutex_destroy.c (pthread_mutex_destroy): Likewise.
2004-05-20 Ross Johnson <rpj at callisto.canberra.edu.au>
* README.NONPORTABLE: Document pthread_win32_test_features_np().
* FAQ: Update various answers.
2004-05-19 Ross Johnson <rpj at callisto.canberra.edu.au>
* Makefile: Don't define _WIN32_WINNT on compiler command line.
* GNUmakefile: Likewise.
2004-05-16 Ross Johnson <rpj at callisto.canberra.edu.au>
* pthread_cancel.c (pthread_cancel): Adapted to use auto-detected
QueueUserAPCEx features at run-time.
(ptw32_RegisterCancelation): Drop in replacement for QueueUserAPCEx()
if it can't be used. Provides older style non-preemptive async
cancelation.
* pthread_win32_attach_detach_np.c (pthread_win32_attach_np):
Auto-detect quserex.dll and the availability of alertdrv.sys;
initialise and close on process attach/detach.
* global.c (ptw32_register_cancelation): Pointer to either
QueueUserAPCEx() or ptw32_RegisterCancelation() depending on
availability. QueueUserAPCEx makes pre-emptive async cancelation
possible.
* implement.h: Add definitions and prototypes related to QueueUserAPC.
2004-05-16 Panagiotis E. Hadjidoukas <peh at hpclab.ceid.upatras.gr>
* QueueUserAPCEx (separate contributed package): Provides preemptive
APC feature.
* pthread_cancel.c (pthread_cancel): Initial integration of
QueueUserAPCEx into pthreads-win32 to provide true pre-emptive
async cancelation of threads, including blocked threads.
2004-05-06 Makoto Kato <raven at oldskool.jp>
* pthread.h (DWORD_PTR): Define typedef for older MSVC.
* pthread_cancel.c (AMD64): Add architecture specific Context register.
* ptw32_getprocessors.c: Use correct types (DWORD_PTR) for mask
variables.
2004-04-06 P. van Bruggen <pietvb at newbridges.nl>
* ptw32_threadDestroy.c: Destroy threadLock mutex to
close a memory leak.
2004-02-13 Gustav Hallberg <gustav at virtutech.com>
* pthread_equal.c: Remove redundant equality logic.
2003-12-10 Philippe Di Cristo <philipped at voicebox.com>
* sem_timedwait.c (sem_timedwait): Fix timeout calculations.
2003-10-20 Alexander Terekhov <TEREKHOV at de.ibm.com>
* pthread_mutex_timedlock.c (ptw32_semwait): Move to individual module.
* ptw32_semwait.c: New module.
* pthread_cond_wait.c (ptw32_cond_wait_cleanup): Replace cancelable
sem_wait() call with non-cancelable ptw32_semwait() call.
* pthread.c (private.c): Re-order for inlining. GNU C warned that
function ptw32_semwait() was defined 'inline' after it was called.
* pthread_cond_signal.c (ptw32_cond_unblock): Likewise.
* pthread_delay_np.c: Disable Watcom warning with comment.
* *.c (process.h): Remove include from .c files. This is conditionally
included by the common project include files.
2003-10-20 James Ewing <james.ewing at sveasoft.com>
* ptw32_getprocessors.c: Some Win32 environments don't have
GetProcessAffinityMask(), so always return CPU count = 1 for them.
* config.h (NEED_PROCESSOR_AFFINITY_MASK): Define for WinCE.
2003-10-15 Ross Johnson <ross at callisto.canberra.edu.au>
* Re-indented all .c files using default GNU style to remove assorted
editor ugliness (used GNU indent utility in default style).
2003-10-15 Alex Blanco <Alex.Blanco at motorola.com>
* sem_init.c (sem_init): Would call CreateSemaphore even if the sema
struct calloc failed; was not freeing calloced memory if either
CreateSemaphore or CreateEvent failed.
2003-10-14 Ross Johnson <ross at callisto.canberra.edu.au>
* pthread.h: Add Watcom compiler compatibility. Esssentially just add
the cdecl attribute to all exposed function prototypes so that Watcom
generates function call code compatible with non-Watcom built libraries.
By default, Watcom uses registers to pass function args if possible rather
than pushing to stack.
* semaphore.h: Likewise.
* sched.h: Likewise.
* pthread_cond_wait.c (ptw32_cond_wait_cleanup): Define with cdecl attribute
for Watcom compatibility. This routine is called via pthread_cleanup_push so
it had to match function arg definition.
* Wmakefile: New makefile for Watcom builds.
2003-09-14 Ross Johnson <rpj at callisto.canberra.edu.au>
* pthread_setschedparam.c (pthread_setschedparam): Attempt to map
all priority levels between max and min (as returned by
sched_get_priority_min/max) to reasonable Win32 priority levels - i.e.
levels between THREAD_PRIORITY_LOWEST/IDLE to THREAD_PRIORITY_LOWEST and
between THREAD_PRIORITY_HIGHEST/TIME_CRITICAL to THREAD_PRIORITY_HIGHEST
while others remain unchanged; record specified thread priority level
for return by pthread_getschedparam.
Note that, previously, specified levels not matching Win32 priority levels
would silently leave the current thread priority unaltered.
* pthread_getschedparam.c (pthread_getschedparam): Return the priority
level specified by the latest pthread_setschedparam or pthread_create rather
than the actual running thread priority as returned by GetThreadPriority - as
required by POSIX. I.e. temporary or adjusted actual priority levels are not
returned by this routine.
* pthread_create.c (pthread_create): For priority levels specified via
pthread attributes, attempt to map all priority levels between max and
min (as returned by sched_get_priority_min/max) to reasonable Win32
priority levels; record priority level given via attributes, or
inherited from parent thread, for later return by pthread_getschedparam.
* ptw32_new.c (ptw32_new): Initialise pthread_t_ sched_priority element.
* pthread_self.c (pthread_self): Set newly created implicit POSIX thread
sched_priority to Win32 thread's current actual priority. Temporarily
altered priorities can't be avoided in this case.
* implement.h (struct pthread_t_): Add new sched_priority element.
2003-09-12 Ross Johnson <rpj at callisto.canberra.edu.au>
* sched_get_priority_min.c (sched_get_priority_min): On error should return -1
with errno set.
* sched_get_priority_max.c (sched_get_priority_max): Likewise.
2003-09-03 Ross Johnson <rpj at callisto.canberra.edu.au>
* w32_cancelableWait.c (ptw32_cancelable_wait): Allow cancelation
of implicit POSIX threads as well.
2003-09-02 Ross Johnson <rpj at callisto.canberra.edu.au>
* pthread_win32_attach_detach_np.c (pthread_win32_thread_detach_np):
Add comment.
* pthread_exit.c (pthread_exit): Fix to recycle the POSIX thread handle in
addition to calling user TSD destructors. Move the implicit POSIX thread exit
handling to ptw32_throw to centralise the logic.
* ptw32_throw.c (ptw32_throw): Implicit POSIX threads have no point
to jump or throw to, so cleanup and exit the thread here in this case. For
processes using the C runtime, the exit code will be set to the POSIX
reason for the throw (i.e. PTHREAD_CANCEL or the value given to pthread_exit).
Note that pthread_exit() already had similar logic, which has been moved to
here.
* ptw32_threadDestroy.c (ptw32_threadDestroy): Don't close the Win32 handle
of implicit POSIX threads - expect this to be done by Win32?
2003-09-01 Ross Johnson <rpj at callisto.canberra.edu.au>
* pthread_self.c (pthread_self): The newly aquired pthread_t must be
assigned to the reuse stack, not freed, if the routine fails somehow.
2003-08-13 Ross Johnson <rpj at ise.canberra.edu.au>
* pthread_getschedparam.c (pthread_getschedparam): An invalid thread ID
parameter was returning an incorrect error value; now uses a more exhaustive
check for validity.
* pthread_setschedparam.c (pthread_setschedparam): Likewise.
* pthread_join.c (pthread_join): Now uses a more exhaustive
check for validity.
* pthread_detach.c (pthread_detach): Likewise.
* pthread_cancel.c (pthread_cancel): Likewise.
* ptw32_threadDestroy.c (ptw32_threadDestroy): pthread_t structs are
never freed - push them onto a stack for reuse.
* ptw32_new.c (ptw32_new): Check for reusable pthread_t before dynamically
allocating new memory for the struct.
* pthread_kill.c (pthread_kill): New file; new routine; takes only a zero
signal arg so that applications can check the thread arg for validity; checks
that the underlying Win32 thread HANDLE is valid.
* pthread.h (pthread_kill): Add prototype.
* ptw32_reuse.c (ptw32_threadReusePop): New file; new routine; pop a
pthread_t off the reuse stack. pthread_t_ structs that have been destroyed, i.e.
have exited detached or have been joined, are cleaned up and put onto a reuse
stack. Consequently, thread IDs are no longer freed once calloced. The library
will attempt to get a struct off this stack before asking the system to alloc
new memory when creating threads. The stack is guarded by a global mutex.
(ptw32_threadReusePush): New routine; push a pthread_t onto the reuse stack.
* implement.h (ptw32_threadReusePush): Add new prototype.
(ptw32_threadReusePop): Likewise.
(pthread_t): Add new element.
* ptw32_processTerminate.c (ptw32_processTerminate): Delete the thread
reuse lock; free all thread ID structs on the thread reuse stack.
* ptw32_processInitialize.c (ptw32_processInitialize): Initialise the
thread reuse lock.
2003-07-19 Ross Johnson <rpj at ise.canberra.edu.au>
* GNUmakefile: modified to work under MsysDTK environment.
* pthread_spin_lock.c (pthread_spin_lock): Check for NULL arg.
* pthread_spin_unlock.c (pthread_spin_unlock): Likewise.
* pthread_spin_trylock.c (pthread_spin_trylock): Likewise;
fix incorrect pointer value if lock is dynamically initialised by
this function.
* sem_init.c (sem_init): Initialise sem_t value to quell compiler warning.
* sem_destroy.c (sem_destroy): Likewise.
* ptw32_threadStart.c (non-MSVC code sections): Include <exception> rather
than old-style <new.h>; fix all std:: namespace entities such as
std::terminate_handler instances and associated methods.
* ptw32_callUserDestroyRoutines.c (non-MSVC code sections): Likewise.
2003-06-24 Piet van Bruggen <pietvb at newbridges.nl>
* pthread_spin_destroy.c (pthread_spin_destroy): Was not freeing the
spinlock struct.
2003-06-22 Nicolas Barry <boozai at yahoo.com>
* pthread_mutex_destroy.c (pthread_mutex_destroy): When called
with a recursive mutex that was locked by the current thread, the
function was failing with a success return code.
2003-05-15 Steven Reddie <Steven.Reddie at ca.com>
* pthread_win32_attach_detach_np.c (pthread_win32_process_detach_np):
NULLify ptw32_selfThreadKey after the thread is destroyed, otherwise
destructors calling pthreads routines might resurrect it again, creating
memory leaks. Call the underlying Win32 Tls routine directly rather than
pthread_setspecific().
(pthread_win32_thread_detach_np): Likewise.
2003-05-14 Viv <vcotirlea at hotmail.com>
* pthread.dsp: Change /MT compile flag to /MD.
2003-03-04 Alexander Terekhov <TEREKHOV at de.ibm.com>
* pthread_mutex_timedlock.c (pthread_mutex_timedlock): Fix failure to
set ownership of mutex on second grab after abstime timeout.
- bug reported by Robert Strycek <strycek at posam.sk>
2002-12-17 Thomas Pfaff <tpfaff at gmx.net>
* pthread_mutex_lock.c (ptw32_semwait): New static routine to provide
a non-cancelable sem_wait() function. This is consistent with the
way that pthread_mutex_timedlock.c does it.
(pthread_mutex_lock): Use ptw32_semwait() instead of sem_wait().
2002-12-11 Thomas Pfaff <tpfaff at gmx.net>
* pthread_mutex_trylock.c: Should return EBUSY rather than EDEADLK.
* pthread_mutex_destroy.c: Remove redundant ownership test (the
trylock call does this for us); do not destroy a recursively locked
mutex.
2002-09-20 Michael Johnson <michaelj at maine.rr.com>
* pthread_cond_destroy.c (pthread_cond_destroy):
When two different threads exist, and one is attempting to
destroy a condition variable while the other is attempting to
initialize a condition variable that was created with
PTHREAD_COND_INITIALIZER, a deadlock can occur. Shrink
the ptw32_cond_list_lock critical section to fix it.
2002-07-31 Ross Johnson <rpj at special.ise.canberra.edu.au>
* ptw32_threadStart.c (ptw32_threadStart): Thread cancelLock
destruction moved to ptw32_threadDestroy().
* ptw32_threadDestroy.c (ptw32_threadDestroy): Destroy
the thread's cancelLock. Moved here from ptw32_threadStart.c
to cleanup implicit threads as well.
2002-07-30 Alexander Terekhov <TEREKHOV at de.ibm.com>
* pthread_cond_wait.c (ptw32_cond_wait_cleanup):
Remove code designed to avoid/prevent spurious wakeup
problems. It is believed that the sem_timedwait() call
is consuming a CV signal that it shouldn't and this is
breaking the avoidance logic.
2002-07-30 Ross Johnson <rpj at ise.canberra.edu.au>
* sem_timedwait.c (sem_timedwait): Tighten checks for
unreasonable abstime values - that would result in
unexpected timeout values.
* w32_CancelableWait.c (ptw32_cancelable_wait):
Tighten up return value checking and add comments.
2002-06-08 Ross Johnson <rpj at special.ise.canberra.edu.au>
* sem_getvalue.c (sem_getvalue): Now returns a value for the
NEED_SEM version (i.e. earlier versions of WinCE).
2002-06-04 Rob Fanner <rfanner at stonethree.com>
* sem_getvalue.c (sem_getvalue): The Johnson M. Hart
approach didn't work - we are forced to take an
intrusive approach. We try to decrement the sema
and then immediately release it again to get the
value. There is a small probability that this may
block other threads, but only momentarily.
2002-06-03 Ross Johnson <rpj at ise.canberra.edu.au>
* sem_init.c (sem_init): Initialise Win32 semaphores
to _POSIX_SEM_VALUE_MAX (which this implementation
defines in pthread.h) so that sem_getvalue() can use
the trick described in the comments in sem_getvalue().
* pthread.h (_POSIX_SEM_VALUE_MAX): Defined.
(_POSIX_SEM_NSEMS_MAX): Defined - not used but may be
useful for source code portability.
2002-06-03 Rob Fanner <rfanner at stonethree.com>
* sem_getvalue.c (sem_getvalue): Did not work on NT.
Use approach suggested by Johnson M. Hart in his book
"Win32 System Programming".
2002-02-28 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* errno.c: Compiler directive was incorrectly including code.
* pthread.h: Conditionally added some #defines from config.h
needed when not building the library. e.g. NEED_ERRNO, NEED_SEM.
(PTW32_DLLPORT): Now only defined if _DLL defined.
(_errno): Compiler directive was incorrectly including prototype.
* sched.h: Conditionally added some #defines from config.h
needed when not building the library.
* semaphore.h: Replace an instance of NEED_SEM that should
have been NEED_ERRNO. This change currently has nil effect.
* GNUmakefile: Correct some recent changes.
* Makefile: Add rule to generate pre-processor output.
2002-02-23 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* pthread_rwlock_timedrdlock.c: New - untested.
* pthread_rwlock_timedwrlock.c: New - untested.
* Testsuite passed (except known MSVC++ problems)
* pthread_cond_destroy.c: Expand the time change
critical section to solve deadlock problem.
* pthread.c: Add all remaining C modules.
* pthread.h: Use dllexport/dllimport attributes on functions
to avoid using pthread.def.
* sched.h: Likewise.
* semaphore.h: Likewise.
* GNUmakefile: Add new targets for single translation
unit build to maximise inlining potential; generate
pthread.def automatically.
* Makefile: Likewise, but no longer uses pthread.def.
2002-02-20 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* pthread_cond_destroy.c (pthread_cond_destroy):
Enter the time change critical section earlier.
2002-02-17 Ross Johnson <rpj at setup1.ise.canberra.edu.au
* Testsuite passed.
* pthread_timechange_handler_np.c: New; following
a suggestion from Alexander Terekhov that CVs should
be broadcast so that they all re-evaluate their
condition variables and reset a new timeout if
required, whenever an application receives a
WM_TIMECHANGE message. This message indicates that
the system time has been changed. Therefore, CVs
waiting for a timeout set as an abs_time will possibly
not wake up at the expected time. Some applications
may not be tolerant of this.
* pthread_cond_init.c: Add CV to linked list.
* pthread_cond_destroy.c: Remove CV from linked list.
* global.c (ptw32_cond_list_head): New variable.
(ptw32_cond_list_tail): New variable.
(ptw32_cond_list_cs): New critical section.
* ptw32_processInitialize (ptw32_cond_list_cs): Initialize.
* ptw32_processTerminate (ptw32_cond_list_cs): Delete.
* Reduce executable size.
-----------------------
When linking with the static library, only those
routines actually called, either directly or indirectly
should be included.
[Gcc has the -ffunction-segments option to do this but MSVC
doesn't have this feature as far as I can determine. Other
compilers are undetermined as well. - rpj]
* spin.c: Split file into function segments.
* ptw32_spinlock_check_need_init.c: Separated routine from spin.c.
* pthread_spin_init.c: Likewise.
* pthread_spin_destroy.c: Likewise.
* pthread_spin_lock.c: Likewise.
* pthread_spin_unlock.c: Likewise.
* pthread_spin_trylock.c: Likewise.
* sync.c: Split file into function segments.
* pthread_detach.c: Separated routine from sync.c.
* pthread_join.c: Likewise.
* tsd.c: Split file into function segments.
* pthread_key_create.c: Separated routine from tsd.c.
* pthread_key_delete.c: Likewise.
* pthread_setspecific.c: Likewise.
* pthread_getspecific.c: Likewise.
* sched.c: Split file into function segments.
* pthread_attr_setschedpolicy.c: Separated routine from sched.c.
* pthread_attr_getschedpolicy.c: Likewise.
* pthread_attr_setschedparam.c: Likewise.
* pthread_attr_getschedparam.c: Likewise.
* pthread_attr_setinheritsched.c: Likewise.
* pthread_attr_getinheritsched.c: Likewise.
* pthread_setschedparam.c: Likewise.
* pthread_getschedparam.c: Likewise.
* sched_get_priority_max.c: Likewise.
* sched_get_priority_min.c: Likewise.
* sched_setscheduler.c: Likewise.
* sched_getscheduler.c: Likewise.
* sched_yield.c: Likewise.
2002-02-16 Ross Johnson <rpj at setup1.ise.canberra.edu.au
Reduce executable size.
-----------------------
When linking with the static library, only those
routines actually called, either directly or indirectly
should be included.
[Gcc has the -ffunction-segments option to do this but MSVC
doesn't have this feature as far as I can determine. Other
compilers are undetermined as well. - rpj]
* mutex.c: Split file into function segments.
* pthread_mutexattr_destroy.c: Separated routine from mutex.c
* pthread_mutexattr_getpshared.c: Likewise.
* pthread_mutexattr_gettype.c: Likewise.
* pthread_mutexattr_init.c: Likewise.
* pthread_mutexattr_setpshared.c: Likewise.
* pthread_mutexattr_settype.c: Likewise.
* ptw32_mutex_check_need_init.c: Likewise.
* pthread_mutex_destroy.c: Likewise.
* pthread_mutex_init.c: Likewise.
* pthread_mutex_lock.c: Likewise.
* pthread_mutex_timedlock.c: Likewise.
* pthread_mutex_trylock.c: Likewise.
* pthread_mutex_unlock.c: Likewise.
* private.c: Split file into function segments.
* ptw32_InterlockedCompareExchange.c: Separated routine from private.c
* ptw32_callUserDestroyRoutines.c: Likewise.
* ptw32_getprocessors.c: Likewise.
* ptw32_processInitialize.c: Likewise.
* ptw32_processTerminate.c: Likewise.
* ptw32_threadDestroy.c: Likewise.
* ptw32_threadStart.c: Likewise.
* ptw32_throw.c: Likewise.
* ptw32_timespec.c: Likewise.
* ptw32_tkAssocCreate.c: Likewise.
* ptw32_tkAssocDestroy.c: Likewise.
* rwlock.c: Split file into function segments.
* pthread_rwlockattr_destroy.c: Separated routine from rwlock.c
* pthread_rwlockattr_getpshared.c: Likewise.
* pthread_rwlockattr_init.c: Likewise.
* pthread_rwlockattr_setpshared.c: Likewise.
* ptw32_rwlock_check_need_init.c: Likewise.
* pthread_rwlock_destroy.c: Likewise.
* pthread_rwlock_init.c: Likewise.
* pthread_rwlock_rdlock.c: Likewise.
* pthread_rwlock_tryrdlock.c: Likewise.
* pthread_rwlock_trywrlock.c: Likewise.
* pthread_rwlock_unlock.c: Likewise.
* pthread_rwlock_wrlock.c: Likewise.
2002-02-10 Ross Johnson <rpj at setup1.ise.canberra.edu.au
Reduce executable size.
-----------------------
When linking with the static library, only those
routines actually called, either directly or indirectly
should be included.
[Gcc has the -ffunction-segments option to do this but MSVC
doesn't have this feature as far as I can determine. Other
compilers are undetermined as well. - rpj]
* nonportable.c: Split file into function segments.
* np_delay.c: Separated routine from nonportable.c
* np_getw32threadhandle.c: Likewise.
* np_mutexattr_setkind.c: Likewise.
* np_mutexattr_getkind.c: Likewise.
* np_num_processors.c: Likewise.
* np_win32_attach_detach.c: Likewise.
* misc.c: Split file into function segments.
* pthread_equal.c: Separated routine from nonportable.c.
* pthread_getconcurrency.c: Likewise.
* pthread_once.c: Likewise.
* pthread_self.c: Likewise.
* pthread_setconcurrency.c: Likewise.
* ptw32_calloc.c: Likewise.
* ptw32_new.c: Likewise.
* w32_CancelableWait.c: Likewise.
2002-02-09 Ross Johnson <rpj at setup1.ise.canberra.edu.au
Reduce executable size.
-----------------------
When linking with the static library, only those
routines actually called, either directly or indirectly
should be included.
[Gcc has the -ffunction-segments option to do this but MSVC
doesn't have this feature as far as I can determine. Other
compilers are undetermined as well. - rpj]
* condvar.c: Split file into function segments.
* pthread_condattr_destroy.c: Separated routine from condvar.c.
* pthread_condattr_getpshared.c: Likewise.
* pthread_condattr_init.c: Likewise.
* pthread_condattr_setpshared.c: Likewise.
* ptw32_cond_check_need_init.c: Likewise.
* pthread_cond_destroy.c: Likewise.
* pthread_cond_init.c: Likewise.
* pthread_cond_signal.c: Likewise.
* pthread_cond_wait.c: Likewise.
2002-02-07 Alexander Terekhov<TEREKHOV at de.ibm.com>
* nonportable.c (pthread_delay_np): Make a true
cancelation point. Deferred cancels will interrupt the
wait.
2002-02-07 Ross Johnson <rpj at setup1.ise.canberra.edu.au
* misc.c (ptw32_new): Add creation of cancelEvent so that
implicit POSIX threads (Win32 threads with a POSIX face)
are cancelable; mainly so that pthread_delay_np doesn't fail
if called from the main thread.
* create.c (pthread_create): Remove creation of cancelEvent
from here; now in ptw32_new().
Reduce executable size.
-----------------------
When linking with the static library, only those
routines actually called, either directly or indirectly
should be included.
[Gcc has the -ffunction-segments option to do this but MSVC
doesn't have this feature as far as I can determine. Other
compilers are undetermined as well. - rpj]
* barrier.c: All routines are now in separate compilation units;
This file is used to congregate the separate modules for
potential inline optimisation and backward build compatibility.
* cancel.c: Likewise.
* pthread_barrierattr_destroy.c: Separated routine from cancel.c.
* pthread_barrierattr_getpshared.c: Likewise.
* pthread_barrierattr_init.c: Likewise.
* pthread_barrierattr_setpshared.c: Likewise.
* pthread_barrier_destroy.c: Likewise.
* pthread_barrier_init.c: Likewise.
* pthread_barrier_wait.c: Likewise.
* pthread_cancel.c: Likewise.
* pthread_setcancelstate.c: Likewise.
* pthread_setcanceltype.c: Likewise.
* pthread_testcancel.c: Likewise.
2002-02-04 Max Woodbury <mtew at cds.duke.edu>
Reduced name space pollution.
-----------------------------
When the appropriate symbols are defined, the headers
will restrict the definitions of new names. In particular,
it must be possible to NOT include the <windows.h>
header and related definitions with some combination
of symbol definitions. Secondly, it should be possible
that additional definitions should be limited to POSIX
compliant symbols by the definition of appropriate symbols.
* pthread.h: POSIX conditionals.
* sched.h: POSIX conditionals.
* semaphore.h: POSIX conditionals.
* semaphore.c: Included <limits.h>.
(sem_init): Changed magic 0x7FFFFFFFL to INT_MAX.
(sem_getvalue): Trial version.
Reduce executable size.
-----------------------
When linking with the static library, only those
routines actually called, either directly or indirectly
should be included.
[Gcc has the -ffunction-segments option to do this but MSVC
doesn't have this feature as far as I can determine. Other
compilers are undetermined as well. - rpj]
* semaphore.c: All routines are now in separate compilation units;
This file is used to congregate the separate modules for
potential inline optimisation and backward build compatibility.
* sem_close.c: Separated routine from semaphore.c.
* ptw32_decrease_semaphore.c: Likewise.
* sem_destroy.c: Likewise.
* sem_getvalue.c: Likewise.
* ptw32_increase_semaphore.c: Likewise.
* sem_init.c: Likewise.
* sem_open.c: Likewise.
* sem_post.c: Likewise.
* sem_post_multiple.c: Likewise.
* sem_timedwait.c: Likewise.
* sem_trywait.c: Likewise.
* sem_unlink.c: Likewise.
* sem_wait.c: Likewise.
2002-02-04 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
The following extends the idea above to the rest of pthreads-win32 - rpj
* attr.c: All routines are now in separate compilation units;
This file is used to congregate the separate modules for
potential inline optimisation and backward build compatibility.
* pthread_attr_destroy.c: Separated routine from attr.c.
* pthread_attr_getdetachstate.c: Likewise.
* pthread_attr_getscope.c: Likewise.
* pthread_attr_getstackaddr.c: Likewise.
* pthread_attr_getstacksize.c: Likewise.
* pthread_attr_init.c: Likewise.
* pthread_attr_is_attr.c: Likewise.
* pthread_attr_setdetachstate.c: Likewise.
* pthread_attr_setscope.c: Likewise.
* pthread_attr_setstackaddr.c: Likewise.
* pthread_attr_setstacksize.c: Likewise.
* pthread.c: Agregation of agregate modules for super-inlineability.
2002-02-02 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* cancel.c: Rearranged some code and introduced checks
to disable cancelation at the start of a thread's cancelation
run to prevent double cancelation. The main problem
arises if a thread is canceling and then receives a subsequent
async cancel request.
* private.c: Likewise.
* condvar.c: Place pragmas around cleanup_push/pop to turn
off inline optimisation (/Obn where n>0 - MSVC only). Various
optimisation switches in MSVC turn this on, which interferes with
the way that cleanup handlers are run in C++ EH and SEH
code. Application code compiled with inline optimisation must
also wrap cleanup_push/pop blocks with the pragmas, e.g.
#pragma inline_depth(0)
pthread_cleanup_push(...)
...
pthread_cleanup_pop(...)
#pragma inline_depth(8)
* rwlock.c: Likewise.
* mutex.c: Remove attempts to inline some functions.
* signal.c: Modify misleading comment.
2002-02-01 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* semaphore.c (sem_trywait): Fix missing errno return
for systems that define NEED_SEM (e.g. early WinCE).
* mutex.c (pthread_mutex_timedlock): Return ENOTSUP
for systems that define NEED_SEM since they don't
have sem_trywait().
2002-01-27 Ross Johnson <rpj at special.ise.canberra.edu.au>
* mutex.c (pthread_mutex_timedlock): New function suggested by
Alexander Terekhov. The logic required to implement this
properly came from Alexander, with some collaboration
with Thomas Pfaff.
(pthread_mutex_unlock): Wrap the waiters check and sema
post in a critical section to prevent a race with
pthread_mutex_timedlock.
(ptw32_timed_semwait): New function;
returns a special result if the absolute timeout parameter
represents a time already passed when called; used by
pthread_mutex_timedwait(). Have deliberately not reused
the name "ptw32_sem_timedwait" because they are not the same
routine.
* condvar.c (ptw32_cond_timedwait): Use the new sem_timedwait()
instead of ptw32_sem_timedwait(), which now has a different
function. See previous.
* implement.h: Remove prototype for ptw32_sem_timedwait.
See next.
(pthread_mutex_t_): Add critical section element for access
to lock_idx during mutex post-timeout processing.
* semaphore.h (sem_timedwait): See next.
* semaphore.c (sem_timedwait): See next.
* private.c (ptw32_sem_timedwait): Move to semaphore.c
and rename as sem_timedwait().
2002-01-18 Ross Johnson <rpj at special.ise.canberra.edu.au>
* sync.c (pthread_join): Was getting the exit code from the
calling thread rather than the joined thread if
defined(__MINGW32__) && !defined(__MSVCRT__).
2002-01-15 Ross Johnson <rpj at special.ise.canberra.edu.au>
* pthread.h: Unless the build explicitly defines __CLEANUP_SEH,
__CLEANUP_CXX, or __CLEANUP_C, then the build defaults to
__CLEANUP_C style cleanup. This style uses setjmp/longjmp
in the cancelation and thread exit implementations and therefore
won't do stack unwinding if linked to applications that have it
(e.g. C++ apps). This is currently consistent with most/all
commercial Unix POSIX threads implementations.
* spin.c (pthread_spin_init): Edit renamed function call.
* nonportable.c (pthread_num_processors_np): New.
(pthread_getprocessors_np): Renamed to ptw32_getprocessors
and moved to private.c.
* private.c (pthread_getprocessors): Moved here from
nonportable.c.
* pthread.def (pthread_getprocessors_np): Removed
from export list.
* rwlock.c (pthread_rwlockattr_init): New.
(pthread_rwlockattr_destroy): New.
(pthread_rwlockattr_getpshared): New.
(pthread_rwlockattr_setpshared): New.
2002-01-14 Ross Johnson <rpj at special.ise.canberra.edu.au>
* attr.c (pthread_attr_setscope): Fix struct pointer
indirection error introduced 2002-01-04.
(pthread_attr_getscope): Likewise.
2002-01-12 Ross Johnson <rpj at special.ise.canberra.edu.au>
* pthread.dsp (SOURCE): Add missing source files.
2002-01-08 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* mutex.c (pthread_mutex_trylock): use
ptw32_interlocked_compare_exchange function pointer
rather than ptw32_InterlockedCompareExchange() directly
to retain portability to non-iX86 processors,
e.g. WinCE etc. The pointer will point to the native
OS version of InterlockedCompareExchange() if the
OS supports it (see ChangeLog entry of 2001-10-17).
2002-01-07 Thomas Pfaff <tpfaff at gmx.net>, Alexander Terekhov <TEREKHOV at de.ibm.com>
* mutex.c (pthread_mutex_init): Remove critical
section calls.
(pthread_mutex_destroy): Likewise.
(pthread_mutex_unlock): Likewise.
(pthread_mutex_trylock): Likewise; uses
ptw32_InterlockedCompareExchange() to avoid need for
critical section; library is no longer i386 compatible;
recursive mutexes now increment the lock count rather
than return EBUSY; errorcheck mutexes return EDEADLCK
rather than EBUSY. This behaviour is consistent with the
Solaris pthreads implementation.
* implement.h (pthread_mutex_t_): Remove critical
section element - no longer needed.
2002-01-04 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* attr.c (pthread_attr_setscope): Add more error
checking and actually store the scope value even
though it's not really necessary.
(pthread_attr_getscope): Return stored value.
* implement.h (pthread_attr_t_): Add new scope element.
* ANNOUNCE: Fix out of date comment next to
pthread_attr_setscope in conformance section.
2001-12-21 Alexander Terekhov <TEREKHOV at de.ibm.com>
* mutex.c (pthread_mutex_lock): Decrementing lock_idx was
not thread-safe.
(pthread_mutex_trylock): Likewise.
2001-10-26 prionx@juno.com
* semaphore.c (sem_init): Fix typo and missing bracket
in conditionally compiled code. Only older versions of
WinCE require this code, hence it doesn't normally get
tested; somehow when sem_t reverted to an opaque struct
the calloc NULL check was left in the conditionally included
section.
(sem_destroy): Likewise, the calloced sem_t wasn't being freed.
2001-10-25 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* GNUmakefile (libwsock32): Add to linker flags for
WSAGetLastError() and WSASetLastError().
* Makefile (wsock32.lib): Likewise.
* create.c: Minor mostly inert changes.
* implement.h (PTW32_MAX): Move into here and renamed
from sched.h.
(PTW32_MIN): Likewise.
* GNUmakefile (TEST_ICE): Define if testing internal
implementation of InterlockedCompareExchange.
* Makefile (TEST_ICE): Likewise.
* private.c (TEST_ICE): Likewise.
2001-10-24 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* attr.c (pthread_attr_setstacksize): Quell warning
from LCC by conditionally compiling the stacksize
validity check. LCC correctly warns that the condition
(stacksize < PTHREAD_STACK_MIN) is suspicious
because STACK_MIN is 0 and stacksize is of type
size_t (or unsigned int).
2001-10-17 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* barrier.c: Move _LONG and _LPLONG defines into
implement.h; rename to PTW32_INTERLOCKED_LONG and
PTW32_INTERLOCKED_LPLONG respectively.
* spin.c: Likewise; ptw32_interlocked_compare_exchange used
in place of InterlockedCompareExchange directly.
* global.c (ptw32_interlocked_compare_exchange): Add
prototype for this new routine pointer to be used when
InterlockedCompareExchange isn't supported by Windows.
* nonportable.c (pthread_win32_process_attach_np): Check for
support of InterlockedCompareExchange in kernel32 and assign its
address to ptw32_interlocked_compare_exchange if it exists, or
our own ix86 specific implementation ptw32_InterlockedCompareExchange.
*private.c (ptw32_InterlockedCompareExchange): An
implementation of InterlockedCompareExchange() which is
specific to ix86; written directly in assembler for either
MSVC or GNU C; needed because Windows 95 doesn't support
InterlockedCompareExchange().
* sched.c (sched_get_priority_min): Extend to return
THREAD_PRIORITY_IDLE.
(sched_get_priority_max): Extend to return
THREAD_PRIORITY_CRITICAL.
2001-10-15 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* spin.c (pthread_spin_lock): PTHREAD_SPINLOCK_INITIALIZER
was causing a program fault.
(pthread_spin_init): Could have alloced memory
without freeing under some error conditions.
* mutex.c (pthread_mutex_init): Move memory
allocation of mutex struct after checking for
PROCESS_SHARED.
2001-10-12 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* spin.c (pthread_spin_unlock): Was not returning
EPERM if the spinlock was not locked, for multi CPU
machines.
2001-10-08 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* spin.c (pthread_spin_trylock): Was not returning
EBUSY for multi CPU machines.
2001-08-24 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* condvar.c (pthread_cond_destroy): Remove cv element
that is no longer used.
* implement.h: Likewise.
2001-08-23 Alexander Terekhov <TEREKHOV at de.ibm.com>
* condvar.c (pthread_cond_destroy): fix bug with
respect to deadlock in the case of concurrent
_destroy/_unblock; a condition variable can be destroyed
immediately after all the threads that are blocked on
it are awakened.
2001-08-23 Phil Frisbie, Jr. <phil at hawksoft.com>
* tsd.c (pthread_getspecific): Preserve the last
winsock error [from WSAGetLastError()].
2001-07-18 Scott McCaskill <scott at magruder.org>
* mutex.c (pthread_mutexattr_init): Return ENOMEM
immediately and don't dereference the NULL pointer
if calloc fails.
(pthread_mutexattr_getpshared): Don't dereference
a pointer that is possibly NULL.
* barrier.c (pthread_barrierattr_init): Likewise
(pthread_barrierattr_getpshared): Don't dereference
a pointer that is possibly NULL.
* condvar.c (pthread_condattr_getpshared): Don't dereference
a pointer that is possibly NULL.
2001-07-15 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* rwlock.c (pthread_rwlock_wrlock): Is allowed to be
a cancelation point; re-enable deferred cancelability
around the CV call.
2001-07-10 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* barrier.c: Still more revamping. The exclusive access
mutex isn't really needed so it has been removed and replaced
by an InterlockedDecrement(). nSerial has been removed.
iStep is now dual-purpose. The process shared attribute
is now stored in the barrier struct.
* implement.h (pthread_barrier_t_): Lost some/gained one
elements.
* private.c (ptw32_threadStart): Removed some comments.
2001-07-10 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* barrier.c: Revamped to fix the race condition. Two alternating
semaphores are used instead of the PulseEvent. Also improved
overall throughput by returning PTHREAD_BARRIER_SERIAL_THREAD
to the first waking thread.
* implement.h (pthread_barrier_t_): Revamped.
2001-07-09 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* barrier.c: Fix several bugs in all routines. Now passes
tests/barrier5.c which is fairly rigorous. There is still
a non-optimal work-around for a race condition between
the barrier breeched event signal and event wait. Basically
the last (signalling) thread to hit the barrier yields
to allow any other threads, which may have lost the race,
to complete.
2001-07-07 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* barrier.c: Changed synchronisation mechanism to a
Win32 manual reset Event and use PulseEvent to signal
waiting threads. If the implementation continued to use
a semaphore it would require a second semaphore and
some management to use them alternately as barriers. A
single semaphore allows threads to cascade from one barrier
through the next, leaving some threads blocked at the first.
* implement.h (pthread_barrier_t_): As per above.
* general: Made a number of other routines inlinable.
2001-07-07 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* spin.c: Revamped and working; included static initialiser.
Now beta level.
* barrier.c: Likewise.
* condvar.c: Macro constant change; inline auto init routine.
* mutex.c: Likewise.
* rwlock.c: Likewise.
* private.c: Add support for spinlock initialiser.
* global.c: Likewise.
* implement.h: Likewise.
* pthread.h (PTHREAD_SPINLOCK_INITIALIZER): Fix typo.
2001-07-05 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* barrier.c: Remove static initialisation - irrelevent
for this object.
* pthread.h (PTHREAD_BARRIER_INITIALIZER): Removed.
* rwlock.c (pthread_rwlock_wrlock): This routine is
not a cancelation point - disable deferred
cancelation around call to pthread_cond_wait().
2001-07-05 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* spin.c: New module implementing spin locks.
* barrier.c: New module implementing barriers.
* pthread.h (_POSIX_SPIN_LOCKS): defined.
(_POSIX_BARRIERS): Defined.
(pthread_spin_*): Defined.
(pthread_barrier*): Defined.
(PTHREAD_BARRIER_SERIAL_THREAD): Defined.
* implement.h (pthread_spinlock_t_): Defined.
(pthread_barrier_t_): Defined.
(pthread_barrierattr_t_): Defined.
* mutex.c (pthread_mutex_lock): Return with the error
if an auto-initialiser initialisation fails.
* nonportable.c (pthread_getprocessors_np): New; gets the
number of available processors for the current process.
2001-07-03 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* pthread.h (_POSIX_READER_WRITER_LOCKS): Define it
if not already defined.
2001-07-01 Alexander Terekhov <TEREKHOV at de.ibm.com>
* condvar.c: Fixed lost signal bug reported by Timur Aydin
(taydin@snet.net).
[RPJ (me) didn't translate the original algorithm
correctly.]
* semaphore.c: Added sem_post_multiple; this is a useful
routine, but it doesn't appear to be standard. For now it's
not an exported function.
2001-06-25 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* create.c (pthread_create): Add priority inheritance
attributes.
* mutex.c (pthread_mutex_lock): Remove some overhead for
PTHREAD_MUTEX_NORMAL mutex types. Specifically, avoid
calling pthread_self() and pthread_equal() to check/set
the mutex owner. Introduce a new pseudo owner for this
type. Test results suggest increases in speed of up to
90% for non-blocking locks.
This is the default type of mutex used internally by other
synchronising objects, ie. condition variables and
read-write locks. The test rwlock7.c shows about a
30-35% speed increase over snapshot 2001-06-06. The
price of this is that the application developer
must ensure correct behaviour, or explicitly set the
mutex to a safer type such as PTHREAD_MUTEX_ERRORCHECK.
For example, PTHREAD_MUTEX_NORMAL (or PTHREAD_MUTEX_DEFAULT)
type mutexes will not return an error if a thread which is not
the owner calls pthread_mutex_unlock. The call will succeed
in unlocking the mutex if it is currently locked, but a
subsequent unlock by the true owner will then fail with EPERM.
This is however consistent with some other implementations.
(pthread_mutex_unlock): Likewise.
(pthread_mutex_trylock): Likewise.
(pthread_mutex_destroy): Likewise.
* attr.c (pthread_attr_init): PTHREAD_EXPLICIT_SCHED is the
default inheritance attribute; THREAD_PRIORITY_NORMAL is
the default priority for new threads.
* sched.c (pthread_attr_setschedpolicy): Added routine.
(pthread_attr_getschedpolicy): Added routine.
(pthread_attr_setinheritsched): Added routine.
(pthread_attr_getinheritsched): Added routine.
* pthread.h (sched_rr_set_interval): Added as a macro;
returns -1 with errno set to ENOSYS.
2001-06-23 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
*sched.c (pthread_attr_setschedparam): Add priority range
check.
(sched_setscheduler): New function; checks for a valid
pid and policy; checks for permission to set information
in the target process; expects pid to be a Win32 process ID,
not a process handle; the only scheduler policy allowed is
SCHED_OTHER.
(sched_getscheduler): Likewise, but checks for permission
to query.
* pthread.h (SCHED_*): Moved to sched.h as defined in the
POSIX standard.
* sched.h (SCHED_*): Moved from pthread.h.
(pid_t): Defined if necessary.
(sched_setscheduler): Defined.
(sched_getscheduler): Defined.
* pthread.def (sched_setscheduler): Exported.
(sched_getscheduler): Likewise.
2001-06-23 Ralf Brese <Ralf.Brese at pdb4.siemens.de>
* create.c (pthread_create): Set thread priority from
thread attributes.
2001-06-18 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* Made organisational-only changes to UWIN additions.
* dll.c (dllMain): Moved UWIN process attach code
to pthread_win32_process_attach_np(); moved
instance of pthread_count to global.c.
* global.c (pthread_count): Moved from dll.c.
* nonportable.c (pthread_win32_process_attach_np):
Moved _UWIN code to here from dll.c.
* implement.h (pthread_count): Define extern int.
* create.c (pthread_count): Remove extern int.
* private.c (pthread_count): Likewise.
* exit.c (pthread_count): Likewise.
2001-06-18 David Korn <dgk at research.att.com>
* dll.c: Added changes necessary to work with UWIN.
* create.c: Likewise.
* pthread.h: Likewise.
* misc.c: Likewise.
* exit.c: Likewise.
* private.c: Likewise.
* implement.h: Likewise.
There is some room at the start of struct pthread_t_
to implement the signal semantics in UWIN's posix.dll
although this is not yet complete.
* Nmakefile: Compatible with UWIN's Nmake utility.
* Nmakefile.tests: Likewise - for running the tests.
2001-06-08 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* semaphore.h (sem_t): Fixed for compile and test.
* implement.h (sem_t_): Likewise.
* semaphore.c: Likewise.
* private.c (ptw32_sem_timedwait): Updated to use new
opaque sem_t.
2001-06-06 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* semaphore.h (sem_t): Is now an opaque pointer;
moved actual definition to implement.h.
* implement.h (sem_t_): Move here from semaphore.h;
was the definition of sem_t.
* semaphore.c: Wherever necessary, changed use of sem
from that of a pointer to a pointer-pointer; added
extra checks for a valid sem_t; NULL sem_t when
it is destroyed; added extra checks when creating
and destroying sem_t elements in the NEED_SEM
code branches; changed from using a pthread_mutex_t
((*sem)->mutex) to CRITICAL_SECTION ((*sem)->sem_lock_cs)
in NEED_SEM branches for access serialisation.
2001-06-06 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* mutex.c (pthread_mutexattr_init): Remove
ptw32_mutex_default_kind.
2001-06-05 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* nonportable.c (pthread_mutex_setdefaultkind_np):
Remove - should not have been included in the first place.
(pthread_mutex_getdefaultkind_np): Likewise.
* global.c (ptw32_mutex_default_kind): Likewise.
* mutex.c (pthread_mutex_init): Remove use of
ptw32_mutex_default_kind.
* pthread.h (pthread_mutex_setdefaultkind_np): Likewise.
(pthread_mutex_getdefaultkind_np): Likewise.
* pthread.def (pthread_mutexattr_setkind_np): Added.
(pthread_mutexattr_getkind_np): Likewise.
* README: Many changes that should have gone in before
the last snapshot.
* README.NONPORTABLE: New - referred to by ANNOUNCE
but never created; documents the non-portable routines
included in the library - moved from README with new
routines added.
* ANNOUNCE (pthread_mutexattr_setkind_np): Added to
compliance list.
(pthread_mutexattr_getkind_np): Likewise.
2001-06-04 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* condvar.c: Add original description of the algorithm as
developed by Terekhov and Thomas, plus reference to
README.CV.
2001-06-03 Alexander Terekhov <TEREKHOV at de.ibm.com>, Louis Thomas <lthomas at arbitrade.com>
* condvar.c (pthread_cond_init): Completely revamped.
(pthread_cond_destroy): Likewise.
(ptw32_cond_wait_cleanup): Likewise.
(ptw32_cond_timedwait): Likewise.
(ptw32_cond_unblock): New general signaling routine.
(pthread_cond_signal): Now calls ptw32_cond_unblock.
(pthread_cond_broadcast): Likewise.
* implement.h (pthread_cond_t_): Revamped.
* README.CV: New; explanation of the above changes.
2001-05-30 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* pthread.h (rand_r): Fake using _seed argument to quell
compiler warning (compiler should optimise this away later).
* GNUmakefile (OPT): Leave symbolic information out of the library
and increase optimisation level - for smaller faster prebuilt
dlls.
2001-05-29 Milan Gardian <Milan.Gardian at LEIBINGER.com>
* Makefile: fix typo.
* pthreads.h: Fix problems with stdcall/cdecl conventions, in particular
remove the need for PT_STDCALL everywhere; remove warning supression.
* (errno): Fix the longstanding "inconsistent dll linkage" problem
with errno; now also works with /MD debugging libs -
warnings emerged when compiling pthreads library with /MD (or /MDd)
compiler switch, instead of /MT (or /MTd) (i.e. when compiling pthreads
using Multithreaded DLL CRT instead of Multithreaded statically linked
CRT).
* create.c (pthread_create): Likewise; fix typo.
* private.c (ptw32_threadStart): Eliminate use of terminate() which doesn't
throw exceptions.
* Remove unnecessary #includes from a number of modules -
[I had to #include malloc.h in implement.h for gcc - rpj].
2001-05-29 Thomas Pfaff <tpfaff at gmx.net>
* pthread.h (PTHREAD_MUTEX_DEFAULT): New; equivalent to
PTHREAD_MUTEX_DEFAULT_NP.
* (PTHREAD_MUTEX_NORMAL): Similarly.
* (PTHREAD_MUTEX_ERRORCHECK): Similarly.
* (PTHREAD_MUTEX_RECURSIVE): Similarly.
* (pthread_mutex_setdefaultkind_np): New; Linux compatibility stub
for pthread_mutexattr_settype.
* (pthread_mutexattr_getkind_np): New; Linux compatibility stub
for pthread_mutexattr_gettype.
* mutex.c (pthread_mutexattr_settype): New; allow
the following types of mutex:
PTHREAD_MUTEX_DEFAULT_NP
PTHREAD_MUTEX_NORMAL_NP
PTHREAD_MUTEX_ERRORCHECK_NP
PTHREAD_MUTEX_RECURSIVE_NP
* Note that PTHREAD_MUTEX_DEFAULT is equivalent to
PTHREAD_MUTEX_NORMAL - ie. mutexes should no longer
be recursive by default, and a thread will deadlock if it
tries to relock a mutex it already owns. This is inline with
other pthreads implementations.
* (pthread_mutex_lock): Process the lock request
according to the mutex type.
* (pthread_mutex_init): Eliminate use of Win32 mutexes as the
basis of POSIX mutexes - instead, a combination of one critical section
and one semaphore are used in conjunction with Win32 Interlocked* routines.
* (pthread_mutex_destroy): Likewise.
* (pthread_mutex_lock): Likewise.
* (pthread_mutex_trylock): Likewise.
* (pthread_mutex_unlock): Likewise.
* Use longjmp/setjmp to implement cancelation when building the library
using a C compiler which doesn't support exceptions, e.g. gcc -x c (note
that gcc -x c++ uses exceptions).
* Also fixed some of the same typos and eliminated PT_STDCALL as
Milan Gardian's patches above.
2001-02-07 Alexander Terekhov <TEREKHOV at de.ibm.com>
* rwlock.c: Revamped.
* implement.h (pthread_rwlock_t_): Redefined.
This implementation does not have reader/writer starvation problem.
Rwlock attempts to behave more like a normal mutex with
races and scheduling policy determining who is more important;
It also supports recursive locking,
has less synchronization overhead (no broadcasts at all,
readers are not blocked on any condition variable) and seem to
be faster than the current implementation [W98 appears to be
approximately 15 percent faster at least - on top of speed increase
from Thomas Pfaff's changes to mutex.c - rpj].
2000-12-29 Ross Johnson <rpj at special.ise.canberra.edu.au>
* Makefile: Back-out "for" loops which don't work.
* GNUmakefile: Remove the fake.a target; add the "realclean"
target; don't remove built libs under the "clean" target.
* config.h: Add a guard against multiple inclusion.
* semaphore.h: Add some defines from config.h to make
semaphore.h independent of config.h when building apps.
* pthread.h (_errno): Back-out previous fix until we know how to
fix it properly.
* implement.h (lockCount): Add missing element to pthread_mutex_t_.
* sync.c (pthread_join): Spelling fix in comment.
* private.c (ptw32_threadStart): Reset original termination
function (C++).
(ptw32_threadStart): Cleanup detached threads early in case
the library is statically linked.
(ptw32_callUserDestroyRoutines): Remove [SEH] __try block from
destructor call so that unhandled exceptions will be passed through
to the system; call terminate() from [C++] try block for the same
reason.
* tsd.c (pthread_getspecific): Add comment.
* mutex.c (pthread_mutex_init): Initialise new elements in
pthread_mutex_t.
(pthread_mutex_unlock): Invert "pthread_equal()" test.
2000-12-28 Ross Johnson <rpj at special.ise.canberra.edu.au>
* semaphore.c (mode_t): Use ifndef HAVE_MODE_T to include definition.
* config.h.in (HAVE_MODE_T): Added.
(_UWIN): Start adding defines for the UWIN package.
* private.c (ptw32_threadStart): Unhandled exceptions are
now passed through to the system to deal with. This is consistent
with normal Windows behaviour. C++ applications may use
set_terminate() to override the default behaviour which is
to call ptw32_terminate(). Ptw32_terminate() cleans up some
POSIX thread stuff before calling the system default function
which calls abort(). The users termination function should conform
to standard C++ semantics which is to not return. It should
exit the thread (call pthread_exit()) or exit the application.
* private.c (ptw32_terminate): Added as the default set_terminate()
function. It calls the system default function after cleaning up
some POSIX thread stuff.
* implement.h (ptw32_try_enter_critical_section): Move
declaration.
* global.c (ptw32_try_enter_critical_section): Moved
from dll.c.
* dll.c: Move process and thread attach/detach code into
functions in nonportable.c.
* nonportable.c (pthread_win32_process_attach_np): Process
attach code from dll.c is now available to static linked
applications.
* nonportable.c (pthread_win32_process_detach_np): Likewise.
* nonportable.c (pthread_win32_thread_attach_np): Likewise.
* nonportable.c (pthread_win32_thread_detach_np): Likewise.
* pthread.h: Add new non-portable prototypes for static
linked applications.
* GNUmakefile (OPT): Increase optimisation flag and remove
debug info flag.
* pthread.def: Add new non-portable exports for static
linked applications.
2000-12-11 Ross Johnson <rpj at special.ise.canberra.edu.au>
* FAQ: Update Answer 6 re getting a fully working
Mingw32 built library.
2000-10-10 Steven Reddie <smr at essemer.com.au>
* misc.c (pthread_self): Restore Win32 "last error"
cleared by TlsGetValue() call in
pthread_getspecific()
2000-09-20 Arthur Kantor <akantor at bexusa.com>
* mutex.c (pthread_mutex_lock): Record the owner
of the mutex. This requires also keeping count of
recursive locks ourselves rather than leaving it
to Win32 since we need to know when to NULL the
thread owner when the mutex is unlocked.
(pthread_mutex_trylock): Likewise.
(pthread_mutex_unlock): Check that the calling
thread owns the mutex, decrement the recursive
lock count, and NULL the owner if zero. Return
EPERM if the mutex is owned by another thread.
* implement.h (pthread_mutex_t_): Add ownerThread
and lockCount members.
2000-09-13 Jef Gearhart <jgearhart at tpssys.com>
* mutex.c (pthread_mutex_init): Call
TryEnterCriticalSection through the pointer
rather than directly so that the dll can load
on Windows versions that can't resolve the
function, eg. Windows 95
2000-09-09 Ross Johnson <rpj at special.ise.canberra.edu.au>
* pthread.h (ctime_r): Fix arg.
2000-09-08 Ross Johnson <rpj at special.ise.canberra.edu.au>
* GNUmakefile(_WIN32_WINNT=0x400): Define in CFLAGS;
doesn't seem to be needed though.
* cancel.c (pthread_cancel): Must get "self" through
calling pthread_self() which will ensure a POSIX thread
struct is built for non-POSIX threads; return an error
if this fails
- Ollie Leahy <ollie at mpt.ie>
(pthread_setcancelstate): Likewise.
(pthread_setcanceltype): Likewise.
* misc.c (ptw32_cancelable_wait): Likewise.
* private.c (ptw32_tkAssocCreate): Remove unused #if 0
wrapped code.
* pthread.h (ptw32_get_exception_services_code):
Needed to be forward declared unconditionally.
2000-09-06 Ross Johnson <rpj at special.ise.canberra.edu.au>
* cancel.c (pthread_cancel): If called from the main
thread "self" would be NULL; get "self" via pthread_self()
instead of directly from TLS so that an implicit
pthread object is created.
* misc.c (pthread_equal): Strengthen test for NULLs.
2000-09-02 Ross Johnson <rpj at special.ise.canberra.edu.au>
* condvar.c (ptw32_cond_wait_cleanup): Ensure that all
waking threads check if they are the last, and notify
the broadcaster if so - even if an error occurs in the
waiter.
* semaphore.c (_decrease_semaphore): Should be
a call to ptw32_decrease_semaphore.
(_increase_semaphore): Should be a call to
ptw32_increase_semaphore.
* misc.c (ptw32_cancelable_wait): Renamed from
CancelableWait.
* rwlock.c (_rwlock_check*): Renamed to
ptw32_rwlock_check*.
* mutex.c (_mutex_check*): Renamed to ptw32_mutex_check*.
* condvar.c (cond_timed*): Renamed to ptw32_cond_timed*.
(_cond_check*): Renamed to ptw32_cond_check*.
(cond_wait_cleanup*): Rename to ptw32_cond_wait_cleanup*.
(ptw32_cond_timedwait): Add comments.
2000-08-22 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* private.c (ptw32_throw): Fix exception test;
move exceptionInformation declaration.
* tsd.c (pthread_key_create): newkey wrongly declared.
* pthread.h: Fix comment block.
2000-08-18 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* mutex.c (pthread_mutex_destroy): Check that the mutex isn't
held; invalidate the mutex as early as possible to avoid
contention; not perfect - FIXME!
* rwlock.c (pthread_rwlock_init): Remove redundant assignment
to "rw".
(pthread_rwlock_destroy): Invalidate the rwlock before
freeing up any of it's resources - to avoid contention.
* private.c (ptw32_tkAssocCreate): Change assoc->lock
to use a dynamically initialised mutex - only consumes
a W32 mutex or critical section when first used,
not before.
* mutex.c (pthread_mutex_init): Remove redundant assignment
to "mx".
(pthread_mutexattr_destroy): Set attribute to NULL
before freeing it's memory - to avoid contention.
* implement.h (PTW32_EPS_CANCEL/PTW32_EPS_EXIT):
Must be defined for all compilers - used as generic
exception selectors by ptw32_throw().
* Several: Fix typos from scripted edit session
yesterday.
* nonportable.c (pthread_mutexattr_setforcecs_np):
Moved this function from mutex.c.
(pthread_getw32threadhandle_np): New function to
return the win32 thread handle that the POSIX
thread is using.
* mutex.c (pthread_mutexattr_setforcecs_np):
Moved to new file "nonportable.c".
* pthread.h (PTW32_BUILD): Only redefine __except
and catch compiler keywords if we aren't building
the library (ie. PTW32_BUILD is not defined) -
this is safer than defining and then undefining
if not building the library.
* implement.h: Remove __except and catch undefines.
* Makefile (CFLAGS): Define PTW32_BUILD.
* GNUmakefile (CFLAGS): Define PTW32_BUILD.
* All appropriate: Change Pthread_exception* to
ptw32_exception* to be consistent with internal
identifier naming.
* private.c (ptw32_throw): New function to provide
a generic exception throw for all internal
exceptions and EH schemes.
(ptw32_threadStart): pthread_exit() value is now
returned via the thread structure exitStatus
element.
* exit.c (pthread_exit): pthread_exit() value is now
returned via the thread structure exitStatus
element.
* cancel.c (ptw32_cancel_self): Now uses ptw32_throw.
(pthread_setcancelstate): Ditto.
(pthread_setcanceltype): Ditto.
(pthread_testcancel): Ditto.
(pthread_cancel): Ditto.
* misc.c (CancelableWait): Ditto.
* exit.c (pthread_exit): Ditto.
* All applicable: Change PTW32_ prefix to
PTW32_ prefix to remove leading underscores
from private library identifiers.
2000-08-17 Ross Johnson <rpj at special.ise.canberra.edu.au>
* All applicable: Change _pthread_ prefix to
ptw32_ prefix to remove leading underscores
from private library identifiers (single
and double leading underscores are reserved in the
ANSI C standard for compiler implementations).
* tsd.c (pthread_create_key): Initialise temporary
key before returning it's address to avoid race
conditions.
2000-08-13 Ross Johnson <rpj at special.ise.canberra.edu.au>
* errno.c: Add _MD precompile condition; thus far
had no effect when using /MD compile option but I
thnk it should be there.
* exit.c: Add __cplusplus to various #if lines;
was compiling SEH code even when VC++ had
C++ compile options.
* private.c: ditto.
* create.c (pthread_create): Add PT_STDCALL macro to
function pointer arg in _beginthread().
* pthread.h: PT_STDCALL really does need to be defined
in both this and impliment.h; don't set it to __cdecl
- this macro is only used to extend function pointer
casting for functions that will be passed as parameters.
(~PThreadCleanup): add cast and group expression.
(_errno): Add _MD compile conditional.
(PtW32NoCatchWarn): Change pragma message.
* implement.h: Move and change PT_STDCALL define.
* need_errno.h: Add _MD to compilation conditional.
* GNUmakefile: Substantial rewrite for new naming
convention; set for nil optimisation (turn it up
when we have a working library build; add target
"fake.a" to build a libpthreadw32.a from the VC++
built DLL pthreadVCE.dll.
* pthread.def (LIBRARY): Don't specify in the .def
file - it is specified on the linker command line
since we now use the same .def file for variously
named .dlls.
* Makefile: Substantial rewrite for new naming
convention; default nmake target only issues a
help message; run nmake with specific target
corresponding to the EH scheme being used.
* README: Update information; add naming convention
explanation.
* ANNOUNCE: Update information.
2000-08-12 Ross Johnson <rpj at special.ise.canberra.edu.au>
* pthread.h: Add compile-time message when using
MSC_VER compiler and C++ EH to warn application
programmers to use PtW32Catch instead of catch(...)
if they want cancelation and pthread_exit to work.
* implement.h: Remove #include <semaphore.h>; we
use our own local semaphore.h.
2000-08-10 Ross Johnson <rpj at special.ise.canberra.edu.au>
* cleanup.c (pthread_pop_cleanup): Remove _pthread
prefix from __except and catch keywords; implement.h
now simply undefines ptw32__except and
ptw32_catch if defined; VC++ was not textually
substituting ptw32_catch etc back to catch as
it was redefined; the reason for using the prefixed
version was to make it clear that it was not using
the pthread.h redefined catch keyword.
* private.c (ptw32_threadStart): Ditto.
(ptw32_callUserDestroyRoutines): Ditto.
* implement.h (ptw32__except): Remove #define.
(ptw32_catch): Remove #define.
* GNUmakefile (pthread.a): New target to build
libpthread32.a from pthread.dll using dlltool.
* buildlib.bat: Duplicate cl commands with args to
build C++ EH version of pthread.dll; use of .bat
files is redundant now that nmake compatible
Makefile is included; used as a kludge only now.
* Makefile: Localise some macros and fix up the clean:
target to extend it and work properly.
* CONTRIBUTORS: Add contributors.
* ANNOUNCE: Updated.
* README: Updated.
2000-08-06 Ross Johnson <rpj at special.ise.canberra.edu.au>
* pthread.h: Remove #warning - VC++ doesn't accept it.
2000-08-05 Ross Johnson <rpj at special.ise.canberra.edu.au>
* pthread.h (PtW32CatchAll): Add macro. When compiling
applications using VC++ with C++ EH rather than SEH
'PtW32CatchAll' must be used in place of any 'catch( ... )'
if the application wants pthread cancelation or
pthread_exit() to work.
2000-08-03 Ross Johnson <rpj at special.ise.canberra.edu.au>
* pthread.h: Add a base class ptw32_exception for
library internal exceptions and change the "catch"
re-define macro to use it.
2000-08-02 Ross Johnson <rpj at special.ise.canberra.edu.au>
* GNUmakefile (CFLAGS): Add -mthreads.
Add new targets to generate cpp and asm output.
* sync.c (pthread_join): Remove dead code.
2000-07-25 Tristan Savatier <tristan at mpegtv.com>
* sched.c (sched_get_priority_max): Handle different WinCE and
Win32 priority values together.
(sched_get_priority_min): Ditto.
2000-07-25 Ross Johnson <rpj at special.ise.canberra.edu.au>
* create.c (pthread_create): Force new threads to wait until
pthread_create has the new thread's handle; we also retain
a local copy of the handle for internal use until
pthread_create returns.
* private.c (ptw32_threadStart): Initialise ei[].
(ptw32_threadStart): When beginthread is used to start the
thread, force waiting until the creator thread had the
thread handle.
* cancel.c (ptw32_cancel_thread): Include context switch
code for defined(_X86_) environments in addition to _M_IX86.
* rwlock.c (pthread_rwlock_destroy): Assignment changed
to avoid compiler warning.
* private.c (ptw32_get_exception_services_code): Cast
NULL return value to avoid compiler warning.
* cleanup.c (pthread_pop_cleanup): Initialise "cleanup" variable
to avoid compiler warnings.
* misc.c (ptw32_new): Change "new" variable to "t" to avoid
confusion with the C++ keyword of the same name.
* condvar.c (cond_wait_cleanup): Initialise lastWaiter variable.
(cond_timedwait): Remove unused local variables. to avoid
compiler warnings.
* dll.c (dllMain): Remove 2000-07-21 change - problem
appears to be in pthread_create().
2000-07-22 Ross Johnson <rpj at special.ise.canberra.edu.au>
* tsd.c (pthread_key_create): If a destructor was given
and the pthread_mutex_init failed, then would try to
reference a NULL pointer (*key); eliminate this section of
code by using a dynamically initialised mutex
(PTHREAD_MUTEX_INITIALIZER).
* tsd.c (pthread_setspecific): Return an error if
unable to set the value; simplify cryptic conditional.
* tsd.c (pthread_key_delete): Locking threadsLock relied
on mutex_lock returning an error if the key has no destructor.
ThreadsLock is only initialised if the key has a destructor.
Making this mutex a static could reduce the number of mutexes
used by an application since it is actually created only at
first use and it's often destroyed soon after.
2000-07-22 Ross Johnson <rpj at special.ise.canberra.edu.au>
* FAQ: Added Q5 and Q6.
2000-07-21 David Baggett <dmb at itasoftware.com>
* dll.c: Include resource leakage work-around. This is a
partial FIXME which doesn't stop all leakage. The real
problem needs to be found and fixed.
2000-07-21 Ross Johnson <rpj at setup1.ise.canberra.edu.au>
* create.c (pthread_create): Set threadH to 0 (zero)
everywhere. Some assignments were using NULL. Maybe
it should be NULL everywhere - need to check. (I know
they are nearly always the same thing - but not by
definition.)
* misc.c (pthread_self): Try to catch NULL thread handles
at the point where they might be generated, even though
they should always be valid at this point.
* tsd.c (pthread_setspecific): return an error value if
pthread_self() returns NULL.
* sync.c (pthread_join): return an error value if
pthread_self() returns NULL.
* signal.c (pthread_sigmask): return an error value if
pthread_self() returns NULL.
2000-03-02 Ross Johnson <rpj at special.ise.canberra.edu.au>
* attr.c (pthread_attr_init): Set default stacksize to zero (0)
rather than PTHREAD_STACK_MIN even though these are now the same.
* pthread.h (PTHREAD_STACK_MIN): Lowered to 0.
2000-01-28 Ross Johnson <rpj at special.ise.canberra.edu.au>
* mutex.c (pthread_mutex_init): Free mutex if it has been alloced;
if critical sections can be used instead of Win32 mutexes, test
that the critical section works and return an error if not.
2000-01-07 Ross Johnson <rpj at special.ise.canberra.edu.au>
* cleanup.c (pthread_pop_cleanup): Include SEH code only if MSC is not
compiling as C++.
(pthread_push_cleanup): Include SEH code only if MSC is not
compiling as C++.
* pthread.h: Include SEH code only if MSC is not
compiling as C++.
* implement.h: Include SEH code only if MSC is not
compiling as C++.
* cancel.c (ptw32_cancel_thread): Add _M_IX86 check.
(pthread_testcancel): Include SEH code only if MSC is not
compiling as C++.
(ptw32_cancel_self): Include SEH code only if MSC is not
compiling as C++.
2000-01-06 Erik Hensema <erik.hensema at group2000.nl>
* Makefile: Remove inconsistencies in 'cl' args
2000-01-04 Ross Johnson <rpj at special.ise.canberra.edu.au>
* private.c (ptw32_get_exception_services_code): New; returns
value of EXCEPTION_PTW32_SERVICES.
(ptw32_processInitialize): Remove initialisation of
ptw32_exception_services which is no longer needed.
* pthread.h (ptw32_exception_services): Remove extern.
(ptw32_get_exception_services_code): Add function prototype;
use this to return EXCEPTION_PTW32_SERVICES value instead of
using the ptw32_exception_services variable which I had
trouble exporting through pthread.def.
* global.c (ptw32_exception_services): Remove declaration.
1999-11-22 Ross Johnson <rpj at special.ise.canberra.edu.au>
* implement.h: Forward declare ptw32_new();
* misc.c (ptw32_new): New; alloc and initialise a new pthread_t.
(pthread_self): New thread struct is generated by new routine
ptw32_new().
* create.c (pthread_create): New thread struct is generated
by new routine ptw32_new().
1999-11-21 Ross Johnson <rpj at special.ise.canberra.edu.au>
* global.c (ptw32_exception_services): Declare new variable.
* private.c (ptw32_threadStart): Destroy thread's
cancelLock mutex; make 'catch' and '__except' usageimmune to
redfinitions in pthread.h.