thr-win32.c
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上传日期:2013-05-12
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- /* GNU Objective C Runtime Thread Interface - Win32 Implementation
- Copyright (C) 1996, 1997 Free Software Foundation, Inc.
- Contributed by Galen C. Hunt (gchunt@cs.rochester.edu)
- This file is part of GNU CC.
- GNU CC is free software; you can redistribute it and/or modify it under the
- terms of the GNU General Public License as published by the Free Software
- Foundation; either version 2, or (at your option) any later version.
- GNU CC is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
- details.
- You should have received a copy of the GNU General Public License along with
- GNU CC; see the file COPYING. If not, write to the Free Software
- Foundation, 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
- /* As a special exception, if you link this library with files compiled with
- GCC to produce an executable, this does not cause the resulting executable
- to be covered by the GNU General Public License. This exception does not
- however invalidate any other reasons why the executable file might be
- covered by the GNU General Public License. */
- #include <objc/thr.h>
- #include "runtime.h"
- #ifndef __OBJC__
- #define __OBJC__
- #endif
- #include <windows.h>
- /* Key structure for maintaining thread specific storage */
- static DWORD __objc_data_tls = (DWORD)-1;
- /* Backend initialization functions */
- /* Initialize the threads subsystem. */
- int
- __objc_init_thread_system(void)
- {
- /* Initialize the thread storage key */
- if ((__objc_data_tls = TlsAlloc()) != (DWORD)-1)
- return 0;
- else
- return -1;
- }
- /* Close the threads subsystem. */
- int
- __objc_close_thread_system(void)
- {
- if (__objc_data_tls != (DWORD)-1)
- TlsFree(__objc_data_tls);
- return 0;
- }
- /* Backend thread functions */
- /* Create a new thread of execution. */
- objc_thread_t
- __objc_thread_detach(void (*func)(void *arg), void *arg)
- {
- DWORD thread_id = 0;
- HANDLE win32_handle;
- if (!(win32_handle = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)func,
- arg, 0, &thread_id)))
- thread_id = 0;
-
- return (objc_thread_t)thread_id;
- }
- /* Set the current thread's priority. */
- int
- __objc_thread_set_priority(int priority)
- {
- int sys_priority = 0;
- switch (priority)
- {
- case OBJC_THREAD_INTERACTIVE_PRIORITY:
- sys_priority = THREAD_PRIORITY_NORMAL;
- break;
- default:
- case OBJC_THREAD_BACKGROUND_PRIORITY:
- sys_priority = THREAD_PRIORITY_BELOW_NORMAL;
- break;
- case OBJC_THREAD_LOW_PRIORITY:
- sys_priority = THREAD_PRIORITY_LOWEST;
- break;
- }
- /* Change priority */
- if (SetThreadPriority(GetCurrentThread(), sys_priority))
- return 0;
- else
- return -1;
- }
- /* Return the current thread's priority. */
- int
- __objc_thread_get_priority(void)
- {
- int sys_priority;
- sys_priority = GetThreadPriority(GetCurrentThread());
-
- switch (sys_priority)
- {
- case THREAD_PRIORITY_HIGHEST:
- case THREAD_PRIORITY_TIME_CRITICAL:
- case THREAD_PRIORITY_ABOVE_NORMAL:
- case THREAD_PRIORITY_NORMAL:
- return OBJC_THREAD_INTERACTIVE_PRIORITY;
- default:
- case THREAD_PRIORITY_BELOW_NORMAL:
- return OBJC_THREAD_BACKGROUND_PRIORITY;
-
- case THREAD_PRIORITY_IDLE:
- case THREAD_PRIORITY_LOWEST:
- return OBJC_THREAD_LOW_PRIORITY;
- }
- /* Couldn't get priority. */
- return -1;
- }
- /* Yield our process time to another thread. */
- void
- __objc_thread_yield(void)
- {
- Sleep(0);
- }
- /* Terminate the current thread. */
- int
- __objc_thread_exit(void)
- {
- /* exit the thread */
- ExitThread(__objc_thread_exit_status);
- /* Failed if we reached here */
- return -1;
- }
- /* Returns an integer value which uniquely describes a thread. */
- objc_thread_t
- __objc_thread_id(void)
- {
- return (objc_thread_t)GetCurrentThreadId();
- }
- /* Sets the thread's local storage pointer. */
- int
- __objc_thread_set_data(void *value)
- {
- if (TlsSetValue(__objc_data_tls, value))
- return 0;
- else
- return -1;
- }
- /* Returns the thread's local storage pointer. */
- void *
- __objc_thread_get_data(void)
- {
- return TlsGetValue(__objc_data_tls); /* Return thread data. */
- }
- /* Backend mutex functions */
- /* Allocate a mutex. */
- int
- __objc_mutex_allocate(objc_mutex_t mutex)
- {
- if ((mutex->backend = (void *)CreateMutex(NULL, 0, NULL)) == NULL)
- return -1;
- else
- return 0;
- }
- /* Deallocate a mutex. */
- int
- __objc_mutex_deallocate(objc_mutex_t mutex)
- {
- CloseHandle((HANDLE)(mutex->backend));
- return 0;
- }
- /* Grab a lock on a mutex. */
- int
- __objc_mutex_lock(objc_mutex_t mutex)
- {
- int status;
- status = WaitForSingleObject((HANDLE)(mutex->backend), INFINITE);
- if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED)
- return -1;
- else
- return 0;
- }
- /* Try to grab a lock on a mutex. */
- int
- __objc_mutex_trylock(objc_mutex_t mutex)
- {
- int status;
- status = WaitForSingleObject((HANDLE)(mutex->backend), 0);
- if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED)
- return -1;
- else
- return 0;
- }
- /* Unlock the mutex */
- int
- __objc_mutex_unlock(objc_mutex_t mutex)
- {
- if (ReleaseMutex((HANDLE)(mutex->backend)) == 0)
- return -1;
- else
- return 0;
- }
- /* Backend condition mutex functions */
- /* Allocate a condition. */
- int
- __objc_condition_allocate(objc_condition_t condition)
- {
- /* Unimplemented. */
- return -1;
- }
- /* Deallocate a condition. */
- int
- __objc_condition_deallocate(objc_condition_t condition)
- {
- /* Unimplemented. */
- return -1;
- }
- /* Wait on the condition */
- int
- __objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
- {
- /* Unimplemented. */
- return -1;
- }
- /* Wake up all threads waiting on this condition. */
- int
- __objc_condition_broadcast(objc_condition_t condition)
- {
- /* Unimplemented. */
- return -1;
- }
- /* Wake up one thread waiting on this condition. */
- int
- __objc_condition_signal(objc_condition_t condition)
- {
- /* Unimplemented. */
- return -1;
- }
- /* End of File */