1 /* Threads compatibility routines for libgcc2 and libobjc. */
2 /* Compile this one with gcc. */
3 /* Copyright (C) 1997, 1999, 2000, 2001, 2002, 2003
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
23 /* As a special exception, if you link this library with other files,
24 some of which are compiled with GCC, to produce an executable,
25 this library does not by itself cause the resulting executable
26 to be covered by the GNU General Public License.
27 This exception does not however invalidate any other reasons why
28 the executable file might be covered by the GNU General Public License. */
30 #ifndef GCC_GTHR_POSIX_H
31 #define GCC_GTHR_POSIX_H
33 /* POSIX threads specific definitions.
34 Easy, since the interface is just one-to-one mapping. */
38 /* Some implementations of <pthread.h> require this to be defined. */
46 typedef pthread_key_t __gthread_key_t;
47 typedef pthread_once_t __gthread_once_t;
48 typedef pthread_mutex_t __gthread_mutex_t;
49 typedef pthread_mutex_t __gthread_recursive_mutex_t;
51 #define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
52 #define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT
53 #if defined(PTHREAD_RECURSIVE_MUTEX_INITIALIZER)
54 #define __GTHREAD_RECURSIVE_MUTEX_INIT PTHREAD_RECURSIVE_MUTEX_INITIALIZER
55 #elif defined(PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP)
56 #define __GTHREAD_RECURSIVE_MUTEX_INIT PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
58 #define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
61 #if SUPPORTS_WEAK && GTHREAD_USE_WEAK
63 #pragma weak pthread_once
64 #pragma weak pthread_key_create
65 #pragma weak pthread_key_delete
66 #pragma weak pthread_getspecific
67 #pragma weak pthread_setspecific
68 #pragma weak pthread_create
70 #pragma weak pthread_mutex_lock
71 #pragma weak pthread_mutex_trylock
72 #pragma weak pthread_mutex_unlock
74 #if defined(_LIBOBJC) || defined(_LIBOBJC_WEAK)
76 #pragma weak pthread_cond_broadcast
77 #pragma weak pthread_cond_destroy
78 #pragma weak pthread_cond_init
79 #pragma weak pthread_cond_signal
80 #pragma weak pthread_cond_wait
81 #pragma weak pthread_exit
82 #pragma weak pthread_mutex_init
83 #pragma weak pthread_mutex_destroy
84 #pragma weak pthread_self
85 #ifdef _POSIX_PRIORITY_SCHEDULING
86 #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
87 #pragma weak sched_get_priority_max
88 #pragma weak sched_get_priority_min
89 #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
90 #endif /* _POSIX_PRIORITY_SCHEDULING */
91 #pragma weak sched_yield
92 #pragma weak pthread_attr_destroy
93 #pragma weak pthread_attr_init
94 #pragma weak pthread_attr_setdetachstate
95 #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
96 #pragma weak pthread_getschedparam
97 #pragma weak pthread_setschedparam
98 #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
99 #endif /* _LIBOBJC || _LIBOBJC_WEAK */
102 __gthread_active_p (void)
104 static void *const __gthread_active_ptr = (void *) &pthread_create;
105 return __gthread_active_ptr != 0;
108 #else /* not SUPPORTS_WEAK */
111 __gthread_active_p (void)
116 #endif /* SUPPORTS_WEAK */
120 /* This is the config.h file in libobjc/ */
127 /* Key structure for maintaining thread specific storage */
128 static pthread_key_t _objc_thread_storage;
129 static pthread_attr_t _objc_thread_attribs;
131 /* Thread local storage for a single thread */
132 static void *thread_local_storage = NULL;
134 /* Backend initialization functions */
136 /* Initialize the threads subsystem. */
138 __gthread_objc_init_thread_system (void)
140 if (__gthread_active_p ())
142 /* Initialize the thread storage key */
143 if (pthread_key_create (&_objc_thread_storage, NULL) == 0)
145 /* The normal default detach state for threads is
146 * PTHREAD_CREATE_JOINABLE which causes threads to not die
147 * when you think they should. */
148 if (pthread_attr_init (&_objc_thread_attribs) == 0
149 && pthread_attr_setdetachstate (&_objc_thread_attribs,
150 PTHREAD_CREATE_DETACHED) == 0)
158 /* Close the threads subsystem. */
160 __gthread_objc_close_thread_system (void)
162 if (__gthread_active_p ()
163 && pthread_key_delete (_objc_thread_storage) == 0
164 && pthread_attr_destroy (&_objc_thread_attribs) == 0)
170 /* Backend thread functions */
172 /* Create a new thread of execution. */
173 static inline objc_thread_t
174 __gthread_objc_thread_detach (void (*func)(void *), void *arg)
176 objc_thread_t thread_id;
177 pthread_t new_thread_handle;
179 if (!__gthread_active_p ())
182 if (!(pthread_create (&new_thread_handle, NULL, (void *) func, arg)))
183 thread_id = (objc_thread_t) new_thread_handle;
190 /* Set the current thread's priority. */
192 __gthread_objc_thread_set_priority (int priority)
194 if (!__gthread_active_p ())
198 #ifdef _POSIX_PRIORITY_SCHEDULING
199 #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
200 pthread_t thread_id = pthread_self ();
202 struct sched_param params;
203 int priority_min, priority_max;
205 if (pthread_getschedparam (thread_id, &policy, ¶ms) == 0)
207 if ((priority_max = sched_get_priority_max (policy)) == -1)
210 if ((priority_min = sched_get_priority_min (policy)) == -1)
213 if (priority > priority_max)
214 priority = priority_max;
215 else if (priority < priority_min)
216 priority = priority_min;
217 params.sched_priority = priority;
220 * The solaris 7 and several other man pages incorrectly state that
221 * this should be a pointer to policy but pthread.h is universally
224 if (pthread_setschedparam (thread_id, policy, ¶ms) == 0)
227 #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
228 #endif /* _POSIX_PRIORITY_SCHEDULING */
233 /* Return the current thread's priority. */
235 __gthread_objc_thread_get_priority (void)
237 #ifdef _POSIX_PRIORITY_SCHEDULING
238 #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
239 if (__gthread_active_p ())
242 struct sched_param params;
244 if (pthread_getschedparam (pthread_self (), &policy, ¶ms) == 0)
245 return params.sched_priority;
250 #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
251 #endif /* _POSIX_PRIORITY_SCHEDULING */
252 return OBJC_THREAD_INTERACTIVE_PRIORITY;
255 /* Yield our process time to another thread. */
257 __gthread_objc_thread_yield (void)
259 if (__gthread_active_p ())
263 /* Terminate the current thread. */
265 __gthread_objc_thread_exit (void)
267 if (__gthread_active_p ())
268 /* exit the thread */
269 pthread_exit (&__objc_thread_exit_status);
271 /* Failed if we reached here */
275 /* Returns an integer value which uniquely describes a thread. */
276 static inline objc_thread_t
277 __gthread_objc_thread_id (void)
279 if (__gthread_active_p ())
280 return (objc_thread_t) pthread_self ();
282 return (objc_thread_t) 1;
285 /* Sets the thread's local storage pointer. */
287 __gthread_objc_thread_set_data (void *value)
289 if (__gthread_active_p ())
290 return pthread_setspecific (_objc_thread_storage, value);
293 thread_local_storage = value;
298 /* Returns the thread's local storage pointer. */
300 __gthread_objc_thread_get_data (void)
302 if (__gthread_active_p ())
303 return pthread_getspecific (_objc_thread_storage);
305 return thread_local_storage;
308 /* Backend mutex functions */
310 /* Allocate a mutex. */
312 __gthread_objc_mutex_allocate (objc_mutex_t mutex)
314 if (__gthread_active_p ())
316 mutex->backend = objc_malloc (sizeof (pthread_mutex_t));
318 if (pthread_mutex_init ((pthread_mutex_t *) mutex->backend, NULL))
320 objc_free (mutex->backend);
321 mutex->backend = NULL;
329 /* Deallocate a mutex. */
331 __gthread_objc_mutex_deallocate (objc_mutex_t mutex)
333 if (__gthread_active_p ())
338 * Posix Threads specifically require that the thread be unlocked
339 * for pthread_mutex_destroy to work.
344 count = pthread_mutex_unlock ((pthread_mutex_t *) mutex->backend);
350 if (pthread_mutex_destroy ((pthread_mutex_t *) mutex->backend))
353 objc_free (mutex->backend);
354 mutex->backend = NULL;
359 /* Grab a lock on a mutex. */
361 __gthread_objc_mutex_lock (objc_mutex_t mutex)
363 if (__gthread_active_p ()
364 && pthread_mutex_lock ((pthread_mutex_t *) mutex->backend) != 0)
372 /* Try to grab a lock on a mutex. */
374 __gthread_objc_mutex_trylock (objc_mutex_t mutex)
376 if (__gthread_active_p ()
377 && pthread_mutex_trylock ((pthread_mutex_t *) mutex->backend) != 0)
385 /* Unlock the mutex */
387 __gthread_objc_mutex_unlock (objc_mutex_t mutex)
389 if (__gthread_active_p ()
390 && pthread_mutex_unlock ((pthread_mutex_t *) mutex->backend) != 0)
398 /* Backend condition mutex functions */
400 /* Allocate a condition. */
402 __gthread_objc_condition_allocate (objc_condition_t condition)
404 if (__gthread_active_p ())
406 condition->backend = objc_malloc (sizeof (pthread_cond_t));
408 if (pthread_cond_init ((pthread_cond_t *) condition->backend, NULL))
410 objc_free (condition->backend);
411 condition->backend = NULL;
419 /* Deallocate a condition. */
421 __gthread_objc_condition_deallocate (objc_condition_t condition)
423 if (__gthread_active_p ())
425 if (pthread_cond_destroy ((pthread_cond_t *) condition->backend))
428 objc_free (condition->backend);
429 condition->backend = NULL;
434 /* Wait on the condition */
436 __gthread_objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex)
438 if (__gthread_active_p ())
439 return pthread_cond_wait ((pthread_cond_t *) condition->backend,
440 (pthread_mutex_t *) mutex->backend);
445 /* Wake up all threads waiting on this condition. */
447 __gthread_objc_condition_broadcast (objc_condition_t condition)
449 if (__gthread_active_p ())
450 return pthread_cond_broadcast ((pthread_cond_t *) condition->backend);
455 /* Wake up one thread waiting on this condition. */
457 __gthread_objc_condition_signal (objc_condition_t condition)
459 if (__gthread_active_p ())
460 return pthread_cond_signal ((pthread_cond_t *) condition->backend);
468 __gthread_once (__gthread_once_t *once, void (*func) (void))
470 if (__gthread_active_p ())
471 return pthread_once (once, func);
477 __gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
479 return pthread_key_create (key, dtor);
483 __gthread_key_delete (__gthread_key_t key)
485 return pthread_key_delete (key);
489 __gthread_getspecific (__gthread_key_t key)
491 return pthread_getspecific (key);
495 __gthread_setspecific (__gthread_key_t key, const void *ptr)
497 return pthread_setspecific (key, ptr);
501 __gthread_mutex_lock (__gthread_mutex_t *mutex)
503 if (__gthread_active_p ())
504 return pthread_mutex_lock (mutex);
510 __gthread_mutex_trylock (__gthread_mutex_t *mutex)
512 if (__gthread_active_p ())
513 return pthread_mutex_trylock (mutex);
519 __gthread_mutex_unlock (__gthread_mutex_t *mutex)
521 if (__gthread_active_p ())
522 return pthread_mutex_unlock (mutex);
527 #ifndef PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
529 __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex)
531 if (__gthread_active_p ())
533 pthread_mutexattr_t attr;
536 r = pthread_mutexattr_init (&attr);
538 r = pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE);
540 r = pthread_mutex_init (mutex, &attr);
542 r = pthread_mutexattr_destroy (&attr);
549 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex)
551 return __gthread_mutex_lock (mutex);
555 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex)
557 return __gthread_mutex_trylock (mutex);
561 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex)
563 return __gthread_mutex_unlock (mutex);
566 #endif /* _LIBOBJC */
568 #endif /* ! GCC_GTHR_POSIX_H */