thr-dce.c
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上传日期:2013-05-12
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文件大小:6k
- /* GNU Objective C Runtime Thread Interface
- 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 <pthread.h>
- #include <thr.h>
- #include "runtime.h"
- /* Key structure for maintaining thread specific storage */
- static pthread_key_t _objc_thread_storage;
- /* Backend initialization functions */
- /* Initialize the threads subsystem. */
- int
- __objc_init_thread_system(void)
- {
- /* Initialize the thread storage key */
- return pthread_keycreate(&_objc_thread_storage, NULL);
- }
- /* Close the threads subsystem. */
- int
- __objc_close_thread_system(void)
- {
- /* Destroy the thread storage key */
- /* Not implemented yet */
- /* return pthread_key_delete(&_objc_thread_storage); */
- return 0;
- }
- /* Backend thread functions */
- /* Create a new thread of execution. */
- objc_thread_t
- __objc_thread_detach(void (*func)(void *arg), void *arg)
- {
- objc_thread_t thread_id;
- pthread_t new_thread_handle;
- if (pthread_create(&new_thread_handle, pthread_attr_default,
- (void *)func, arg) == 0)
- {
- /* ??? May not work! (64bit) */
- thread_id = *(objc_thread_t *)&new_thread_handle;
- pthread_detach(&new_thread_handle); /* Fully detach thread. */
- }
- else
- thread_id = NULL;
-
- return 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 = (PRI_FG_MIN_NP + PRI_FG_MAX_NP) / 2;
- break;
- default:
- case OBJC_THREAD_BACKGROUND_PRIORITY:
- sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;
- break;
- case OBJC_THREAD_LOW_PRIORITY:
- sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;
- break;
- }
-
- /* Change the priority. */
- if (pthread_setprio(pthread_self(), sys_priority) >= 0)
- return 0;
- else
- /* Failed */
- return -1;
- }
- /* Return the current thread's priority. */
- int
- __objc_thread_get_priority(void)
- {
- int sys_priority;
-
- if ((sys_priority = pthread_getprio(pthread_self())) >= 0) {
- if (sys_priority >= PRI_FG_MIN_NP && sys_priority <= PRI_FG_MAX_NP)
- return OBJC_THREAD_INTERACTIVE_PRIORITY;
- if (sys_priority >= PRI_BG_MIN_NP && sys_priority <= PRI_BG_MAX_NP)
- return OBJC_THREAD_BACKGROUND_PRIORITY;
- return OBJC_THREAD_LOW_PRIORITY;
- }
- /* Failed */
- return -1;
- }
- /* Yield our process time to another thread. */
- void
- __objc_thread_yield(void)
- {
- pthread_yield();
- }
- /* Terminate the current thread. */
- int
- __objc_thread_exit(void)
- {
- /* exit the thread */
- pthread_exit(&__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)
- {
- pthread_t self = pthread_self();
- return (objc_thread_t) pthread_getunique_np (&self);
- }
- /* Sets the thread's local storage pointer. */
- int
- __objc_thread_set_data(void *value)
- {
- return pthread_setspecific(_objc_thread_storage, value);
- }
- /* Returns the thread's local storage pointer. */
- void *
- __objc_thread_get_data(void)
- {
- void *value = NULL;
- if ( !(pthread_getspecific(_objc_thread_storage, &value)) )
- return value;
- return NULL;
- }
- /* Backend mutex functions */
- /* Allocate a mutex. */
- int
- __objc_mutex_allocate(objc_mutex_t mutex)
- {
- if (pthread_mutex_init((pthread_mutex_t *)(&(mutex->backend)),
- pthread_mutexattr_default))
- return -1;
- else
- return 0;
- }
- /* Deallocate a mutex. */
- int
- __objc_mutex_deallocate(objc_mutex_t mutex)
- {
- if (pthread_mutex_destroy((pthread_mutex_t *)(&(mutex->backend))))
- return -1;
- else
- return 0;
- }
- /* Grab a lock on a mutex. */
- int
- __objc_mutex_lock(objc_mutex_t mutex)
- {
- return pthread_mutex_lock((pthread_mutex_t *)(&(mutex->backend)));
- }
- /* Try to grab a lock on a mutex. */
- int
- __objc_mutex_trylock(objc_mutex_t mutex)
- {
- if (pthread_mutex_trylock((pthread_mutex_t *)(&(mutex->backend))) != 1)
- return -1;
- else
- return 0;
- }
- /* Unlock the mutex */
- int
- __objc_mutex_unlock(objc_mutex_t mutex)
- {
- return pthread_mutex_unlock((pthread_mutex_t *)(&(mutex->backend)));
- }
- /* Backend condition mutex functions */
- /* Allocate a condition. */
- int
- __objc_condition_allocate(objc_condition_t condition)
- {
- /* Unimplemented. */
- return -1;
- /*
- if (pthread_cond_init((pthread_cond_t *)(&(condition->backend)), NULL))
- return -1;
- else
- return 0;
- */
- }
- /* Deallocate a condition. */
- int
- __objc_condition_deallocate(objc_condition_t condition)
- {
- /* Unimplemented. */
- return -1;
- /*
- return pthread_cond_destroy((pthread_cond_t *)(&(condition->backend)));
- */
- }
- /* Wait on the condition */
- int
- __objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
- {
- /* Unimplemented. */
- return -1;
- /*
- return pthread_cond_wait((pthread_cond_t *)(&(condition->backend)),
- (pthread_mutex_t *)(&(mutex->backend)));
- */
- }
- /* Wake up all threads waiting on this condition. */
- int
- __objc_condition_broadcast(objc_condition_t condition)
- {
- /* Unimplemented. */
- return -1;
- /*
- return pthread_cond_broadcast((pthread_cond_t *)(&(condition->backend)));
- */
- }
- /* Wake up one thread waiting on this condition. */
- int
- __objc_condition_signal(objc_condition_t condition)
- {
- /* Unimplemented. */
- return -1;
- /*
- return pthread_cond_signal((pthread_cond_t *)(&(condition->backend)));
- */
- }
- /* End of File */