1 /* Threads compatibility routines for libgcc2 and libobjc. */
2 /* Compile this one with gcc. */
3 /* Copyright (C) 1997, 1999, 2000, 2001 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* As a special exception, if you link this library with other files,
23 some of which are compiled with GCC, to produce an executable,
24 this library does not by itself cause the resulting executable
25 to be covered by the GNU General Public License.
26 This exception does not however invalidate any other reasons why
27 the executable file might be covered by the GNU General Public License. */
29 #ifndef GCC_GTHR_POSIX_H
30 #define GCC_GTHR_POSIX_H
32 /* POSIX threads specific definitions.
33 Easy, since the interface is just one-to-one mapping. */
40 typedef pthread_key_t __gthread_key_t;
41 typedef pthread_once_t __gthread_once_t;
42 typedef pthread_mutex_t __gthread_mutex_t;
44 #define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
45 #define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT
47 #if SUPPORTS_WEAK && GTHREAD_USE_WEAK
49 #pragma weak pthread_once
50 #pragma weak pthread_key_create
51 #pragma weak pthread_key_delete
52 #pragma weak pthread_getspecific
53 #pragma weak pthread_setspecific
54 #pragma weak pthread_create
56 #pragma weak pthread_mutex_lock
57 #pragma weak pthread_mutex_trylock
58 #pragma weak pthread_mutex_unlock
62 #pragma weak pthread_cond_broadcast
63 #pragma weak pthread_cond_destroy
64 #pragma weak pthread_cond_init
65 #pragma weak pthread_cond_signal
66 #pragma weak pthread_cond_wait
67 #pragma weak pthread_exit
68 #pragma weak pthread_mutex_init
69 #pragma weak pthread_mutex_destroy
70 #pragma weak pthread_self
71 /* These really should be protected by _POSIX_PRIORITY_SCHEDULING, but
72 we use them inside a _POSIX_THREAD_PRIORITY_SCHEDULING block. */
73 #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
74 #pragma weak sched_get_priority_max
75 #pragma weak sched_get_priority_min
76 #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
77 #pragma weak sched_yield
78 #pragma weak pthread_attr_destroy
79 #pragma weak pthread_attr_init
80 #pragma weak pthread_attr_setdetachstate
81 #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
82 #pragma weak pthread_getschedparam
83 #pragma weak pthread_setschedparam
84 #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
88 __gthread_active_p (void)
90 static void *const __gthread_active_ptr = (void *) &pthread_create;
91 return __gthread_active_ptr != 0;
94 #else /* not SUPPORTS_WEAK */
97 __gthread_active_p (void)
102 #endif /* SUPPORTS_WEAK */
106 /* This is the config.h file in libobjc/ */
113 /* Key structure for maintaining thread specific storage */
114 static pthread_key_t _objc_thread_storage;
115 static pthread_attr_t _objc_thread_attribs;
117 /* Thread local storage for a single thread */
118 static void *thread_local_storage = NULL;
120 /* Backend initialization functions */
122 /* Initialize the threads subsystem. */
124 __gthread_objc_init_thread_system(void)
126 if (__gthread_active_p ())
128 /* Initialize the thread storage key */
129 if (pthread_key_create(&_objc_thread_storage, NULL) == 0)
131 /* The normal default detach state for threads is
132 * PTHREAD_CREATE_JOINABLE which causes threads to not die
133 * when you think they should. */
134 if (pthread_attr_init(&_objc_thread_attribs) == 0
135 && pthread_attr_setdetachstate(&_objc_thread_attribs,
136 PTHREAD_CREATE_DETACHED) == 0)
144 /* Close the threads subsystem. */
146 __gthread_objc_close_thread_system(void)
148 if (__gthread_active_p ()
149 && pthread_key_delete(_objc_thread_storage) == 0
150 && pthread_attr_destroy(&_objc_thread_attribs) == 0)
156 /* Backend thread functions */
158 /* Create a new thread of execution. */
159 static inline objc_thread_t
160 __gthread_objc_thread_detach(void (*func)(void *), void *arg)
162 objc_thread_t thread_id;
163 pthread_t new_thread_handle;
165 if (!__gthread_active_p ())
168 if ( !(pthread_create(&new_thread_handle, NULL, (void *)func, arg)) )
169 thread_id = (objc_thread_t) new_thread_handle;
176 /* Set the current thread's priority. */
178 __gthread_objc_thread_set_priority(int priority)
180 if (!__gthread_active_p())
183 #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
184 pthread_t thread_id = pthread_self();
186 struct sched_param params;
187 int priority_min, priority_max;
189 if (pthread_getschedparam(thread_id, &policy, ¶ms) == 0)
191 if ((priority_max = sched_get_priority_max(policy)) == -1)
194 if ((priority_min = sched_get_priority_min(policy)) == -1)
197 if (priority > priority_max)
198 priority = priority_max;
199 else if (priority < priority_min)
200 priority = priority_min;
201 params.sched_priority = priority;
204 * The solaris 7 and several other man pages incorrectly state that
205 * this should be a pointer to policy but pthread.h is universally
208 if (pthread_setschedparam(thread_id, policy, ¶ms) == 0)
211 #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
216 /* Return the current thread's priority. */
218 __gthread_objc_thread_get_priority(void)
220 #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
221 if (__gthread_active_p ())
224 struct sched_param params;
226 if (pthread_getschedparam(pthread_self(), &policy, ¶ms) == 0)
227 return params.sched_priority;
232 #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
233 return OBJC_THREAD_INTERACTIVE_PRIORITY;
236 /* Yield our process time to another thread. */
238 __gthread_objc_thread_yield(void)
240 if (__gthread_active_p ())
244 /* Terminate the current thread. */
246 __gthread_objc_thread_exit(void)
248 if (__gthread_active_p ())
249 /* exit the thread */
250 pthread_exit(&__objc_thread_exit_status);
252 /* Failed if we reached here */
256 /* Returns an integer value which uniquely describes a thread. */
257 static inline objc_thread_t
258 __gthread_objc_thread_id(void)
260 if (__gthread_active_p ())
261 return (objc_thread_t) pthread_self();
263 return (objc_thread_t) 1;
266 /* Sets the thread's local storage pointer. */
268 __gthread_objc_thread_set_data(void *value)
270 if (__gthread_active_p ())
271 return pthread_setspecific(_objc_thread_storage, value);
274 thread_local_storage = value;
279 /* Returns the thread's local storage pointer. */
281 __gthread_objc_thread_get_data(void)
283 if (__gthread_active_p ())
284 return pthread_getspecific(_objc_thread_storage);
286 return thread_local_storage;
289 /* Backend mutex functions */
291 /* Allocate a mutex. */
293 __gthread_objc_mutex_allocate(objc_mutex_t mutex)
295 if (__gthread_active_p ())
297 mutex->backend = objc_malloc(sizeof(pthread_mutex_t));
299 if (pthread_mutex_init((pthread_mutex_t *)mutex->backend, NULL))
301 objc_free(mutex->backend);
302 mutex->backend = NULL;
310 /* Deallocate a mutex. */
312 __gthread_objc_mutex_deallocate(objc_mutex_t mutex)
314 if (__gthread_active_p ())
319 * Posix Threads specifically require that the thread be unlocked
320 * for pthread_mutex_destroy to work.
325 count = pthread_mutex_unlock((pthread_mutex_t *)mutex->backend);
331 if (pthread_mutex_destroy((pthread_mutex_t *)mutex->backend))
334 objc_free(mutex->backend);
335 mutex->backend = NULL;
340 /* Grab a lock on a mutex. */
342 __gthread_objc_mutex_lock(objc_mutex_t mutex)
344 if (__gthread_active_p ()
345 && pthread_mutex_lock((pthread_mutex_t *)mutex->backend) != 0)
353 /* Try to grab a lock on a mutex. */
355 __gthread_objc_mutex_trylock(objc_mutex_t mutex)
357 if (__gthread_active_p ()
358 && pthread_mutex_trylock((pthread_mutex_t *)mutex->backend) != 0)
366 /* Unlock the mutex */
368 __gthread_objc_mutex_unlock(objc_mutex_t mutex)
370 if (__gthread_active_p ()
371 && pthread_mutex_unlock((pthread_mutex_t *)mutex->backend) != 0)
379 /* Backend condition mutex functions */
381 /* Allocate a condition. */
383 __gthread_objc_condition_allocate(objc_condition_t condition)
385 if (__gthread_active_p ())
387 condition->backend = objc_malloc(sizeof(pthread_cond_t));
389 if (pthread_cond_init((pthread_cond_t *)condition->backend, NULL))
391 objc_free(condition->backend);
392 condition->backend = NULL;
400 /* Deallocate a condition. */
402 __gthread_objc_condition_deallocate(objc_condition_t condition)
404 if (__gthread_active_p ())
406 if (pthread_cond_destroy((pthread_cond_t *)condition->backend))
409 objc_free(condition->backend);
410 condition->backend = NULL;
415 /* Wait on the condition */
417 __gthread_objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
419 if (__gthread_active_p ())
420 return pthread_cond_wait((pthread_cond_t *)condition->backend,
421 (pthread_mutex_t *)mutex->backend);
426 /* Wake up all threads waiting on this condition. */
428 __gthread_objc_condition_broadcast(objc_condition_t condition)
430 if (__gthread_active_p ())
431 return pthread_cond_broadcast((pthread_cond_t *)condition->backend);
436 /* Wake up one thread waiting on this condition. */
438 __gthread_objc_condition_signal(objc_condition_t condition)
440 if (__gthread_active_p ())
441 return pthread_cond_signal((pthread_cond_t *)condition->backend);
449 __gthread_once (__gthread_once_t *once, void (*func) (void))
451 if (__gthread_active_p ())
452 return pthread_once (once, func);
458 __gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
460 return pthread_key_create (key, dtor);
464 __gthread_key_dtor (__gthread_key_t key, void *ptr)
466 /* Just reset the key value to zero. */
468 return pthread_setspecific (key, 0);
474 __gthread_key_delete (__gthread_key_t key)
476 return pthread_key_delete (key);
480 __gthread_getspecific (__gthread_key_t key)
482 return pthread_getspecific (key);
486 __gthread_setspecific (__gthread_key_t key, const void *ptr)
488 return pthread_setspecific (key, ptr);
492 __gthread_mutex_lock (__gthread_mutex_t *mutex)
494 if (__gthread_active_p ())
495 return pthread_mutex_lock (mutex);
501 __gthread_mutex_trylock (__gthread_mutex_t *mutex)
503 if (__gthread_active_p ())
504 return pthread_mutex_trylock (mutex);
510 __gthread_mutex_unlock (__gthread_mutex_t *mutex)
512 if (__gthread_active_p ())
513 return pthread_mutex_unlock (mutex);
518 #endif /* _LIBOBJC */
520 #endif /* ! GCC_GTHR_POSIX_H */