1 /* GLIB - Library of useful routines for C programming
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
4 * gthread.c: posix thread system implementation
5 * Copyright 1998 Sebastian Wilhelmi; University of Karlsruhe
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
24 * Modified by the GLib Team and others 1997-2000. See the AUTHORS
25 * file for a list of people on the GLib Team. See the ChangeLog
26 * files for a list of changes. These files are distributed with
27 * GLib at ftp://ftp.gtk.org/pub/gtk/.
37 #ifdef HAVE_SYS_TIME_H
38 # include <sys/time.h>
48 #define posix_check_err(err, name) G_STMT_START{ \
51 g_error ("file %s: line %d (%s): error '%s' during '%s'", \
52 __FILE__, __LINE__, G_GNUC_PRETTY_FUNCTION, \
53 g_strerror (error), name); \
56 #define posix_check_cmd(cmd) posix_check_err (posix_error (cmd), #cmd)
59 static gboolean posix_check_cmd_prio_warned = FALSE;
60 # define posix_check_cmd_prio(cmd) G_STMT_START{ \
61 int err = posix_error (cmd); \
64 if (!posix_check_cmd_prio_warned) \
66 posix_check_cmd_prio_warned = TRUE; \
67 g_warning ("Priorities can only be changed " \
68 "(resp. increased) by root."); \
72 posix_check_err (err, #cmd); \
74 #else /* G_ENABLE_DEBUG */
75 # define posix_check_cmd_prio(cmd) G_STMT_START{ \
76 int err = posix_error (cmd); \
78 posix_check_err (err, #cmd); \
80 #endif /* G_ENABLE_DEBUG */
82 #if defined(G_THREADS_IMPL_POSIX)
83 # define posix_error(what) (what)
84 # define mutexattr_default NULL
85 # define condattr_default NULL
86 #elif defined(G_THREADS_IMPL_DCE)
87 # define posix_error(what) ((what) == -1 ? errno : 0)
88 # define pthread_key_create(a, b) pthread_keycreate (a, b)
89 # define pthread_attr_init(a) pthread_attr_create (a)
90 # define pthread_attr_destroy(a) pthread_attr_delete (a)
91 # define pthread_create(a, b, c, d) pthread_create (a, *b, c, d)
92 # define mutexattr_default (pthread_mutexattr_default)
93 # define condattr_default (pthread_condattr_default)
94 #else /* neither G_THREADS_IMPL_POSIX nor G_THREADS_IMPL_DCE are defined */
95 # error This should not happen. Contact the GLib team.
98 #if defined (POSIX_MIN_PRIORITY) && defined (POSIX_MAX_PRIORITY)
99 # define HAVE_PRIORITIES 1
100 # define PRIORITY_LOW_VALUE POSIX_MIN_PRIORITY
101 # define PRIORITY_URGENT_VALUE POSIX_MAX_PRIORITY
102 #endif /* POSIX_MIN_PRIORITY && POSIX_MAX_PRIORITY */
104 static gulong g_thread_min_stack_size = 0;
106 #define G_MUTEX_SIZE (sizeof (pthread_mutex_t))
108 #ifdef _SC_THREAD_STACK_MIN
109 #define HAVE_G_THREAD_IMPL_INIT
113 g_thread_min_stack_size = MAX (sysconf (_SC_THREAD_STACK_MIN), 0);
115 #endif /* _SC_THREAD_STACK_MIN */
118 g_mutex_new_posix_impl (void)
120 GMutex *result = (GMutex *) g_new (pthread_mutex_t, 1);
121 posix_check_cmd (pthread_mutex_init ((pthread_mutex_t *) result,
127 g_mutex_free_posix_impl (GMutex * mutex)
129 posix_check_cmd (pthread_mutex_destroy ((pthread_mutex_t *) mutex));
133 /* NOTE: the functions g_mutex_lock and g_mutex_unlock may not use
134 functions from gmem.c and gmessages.c; */
136 /* pthread_mutex_lock, pthread_mutex_unlock can be taken directly, as
137 signature and semantic are right, but without error check then!!!!,
138 we might want to change this therefore. */
141 g_mutex_trylock_posix_impl (GMutex * mutex)
145 result = pthread_mutex_trylock ((pthread_mutex_t *) mutex);
147 #ifdef G_THREADS_IMPL_POSIX
150 #else /* G_THREADS_IMPL_DCE */
155 posix_check_err (posix_error (result), "pthread_mutex_trylock");
160 g_cond_new_posix_impl (void)
162 GCond *result = (GCond *) g_new (pthread_cond_t, 1);
163 posix_check_cmd (pthread_cond_init ((pthread_cond_t *) result,
168 /* pthread_cond_signal, pthread_cond_broadcast and pthread_cond_wait
169 can be taken directly, as signature and semantic are right, but
170 without error check then!!!!, we might want to change this
173 #define G_NSEC_PER_SEC 1000000000
176 g_cond_timed_wait_posix_impl (GCond * cond,
177 GMutex * entered_mutex,
181 struct timespec end_time;
184 g_return_val_if_fail (cond != NULL, FALSE);
185 g_return_val_if_fail (entered_mutex != NULL, FALSE);
189 g_cond_wait (cond, entered_mutex);
193 end_time.tv_sec = abs_time->tv_sec;
194 end_time.tv_nsec = abs_time->tv_usec * (G_NSEC_PER_SEC / G_USEC_PER_SEC);
195 g_assert (end_time.tv_nsec < G_NSEC_PER_SEC);
196 result = pthread_cond_timedwait ((pthread_cond_t *) cond,
197 (pthread_mutex_t *) entered_mutex,
200 #ifdef G_THREADS_IMPL_POSIX
201 timed_out = (result == ETIMEDOUT);
202 #else /* G_THREADS_IMPL_DCE */
203 timed_out = (result == -1) && (errno = EAGAIN);
207 posix_check_err (posix_error (result), "pthread_cond_timedwait");
212 g_cond_free_posix_impl (GCond * cond)
214 posix_check_cmd (pthread_cond_destroy ((pthread_cond_t *) cond));
219 g_private_new_posix_impl (GDestroyNotify destructor)
221 GPrivate *result = (GPrivate *) g_new (pthread_key_t, 1);
222 posix_check_cmd (pthread_key_create ((pthread_key_t *) result, destructor));
226 /* NOTE: the functions g_private_get and g_private_set may not use
227 functions from gmem.c and gmessages.c */
230 g_private_set_posix_impl (GPrivate * private_key, gpointer value)
234 pthread_setspecific (*(pthread_key_t *) private_key, value);
238 g_private_get_posix_impl (GPrivate * private_key)
242 #ifdef G_THREADS_IMPL_POSIX
243 return pthread_getspecific (*(pthread_key_t *) private_key);
244 #else /* G_THREADS_IMPL_DCE */
247 posix_check_cmd (pthread_getspecific (*(pthread_key_t *) private_key,
255 g_thread_create_posix_impl (GThreadFunc thread_func,
260 GThreadPriority priority,
267 g_return_if_fail (thread_func);
268 g_return_if_fail (priority >= G_THREAD_PRIORITY_LOW);
269 g_return_if_fail (priority <= G_THREAD_PRIORITY_URGENT);
271 posix_check_cmd (pthread_attr_init (&attr));
273 #ifdef HAVE_PTHREAD_ATTR_SETSTACKSIZE
276 stack_size = MAX (g_thread_min_stack_size, stack_size);
277 posix_check_cmd (pthread_attr_setstacksize (&attr, stack_size));
279 #endif /* HAVE_PTHREAD_ATTR_SETSTACKSIZE */
281 #ifdef PTHREAD_SCOPE_SYSTEM
283 /* No error check here, because some systems can't do it and we
284 * simply don't want threads to fail because of that. */
285 pthread_attr_setscope (&attr, PTHREAD_SCOPE_SYSTEM);
286 #endif /* PTHREAD_SCOPE_SYSTEM */
288 #ifdef G_THREADS_IMPL_POSIX
289 posix_check_cmd (pthread_attr_setdetachstate (&attr,
290 joinable ? PTHREAD_CREATE_JOINABLE : PTHREAD_CREATE_DETACHED));
291 #endif /* G_THREADS_IMPL_POSIX */
293 #ifdef HAVE_PRIORITIES
294 # ifdef G_THREADS_IMPL_POSIX
296 struct sched_param sched;
297 posix_check_cmd (pthread_attr_getschedparam (&attr, &sched));
298 sched.sched_priority = g_thread_priority_map [priority];
299 posix_check_cmd_prio (pthread_attr_setschedparam (&attr, &sched));
301 # else /* G_THREADS_IMPL_DCE */
303 (pthread_attr_setprio (&attr, g_thread_priority_map [priority]));
304 # endif /* G_THREADS_IMPL_DCE */
305 #endif /* HAVE_PRIORITIES */
306 ret = posix_error (pthread_create (thread, &attr,
307 (void* (*)(void*))thread_func, arg));
309 posix_check_cmd (pthread_attr_destroy (&attr));
313 g_set_error (error, G_THREAD_ERROR, G_THREAD_ERROR_AGAIN,
314 "Error creating thread: %s", g_strerror (ret));
318 posix_check_err (ret, "pthread_create");
320 #ifdef G_THREADS_IMPL_DCE
322 posix_check_cmd (pthread_detach (thread));
323 #endif /* G_THREADS_IMPL_DCE */
327 g_thread_yield_posix_impl (void)
333 g_thread_join_posix_impl (gpointer thread)
336 posix_check_cmd (pthread_join (*(pthread_t*)thread, &ignore));
340 g_thread_exit_posix_impl (void)
346 g_thread_set_priority_posix_impl (gpointer thread, GThreadPriority priority)
348 g_return_if_fail (priority >= G_THREAD_PRIORITY_LOW);
349 g_return_if_fail (priority <= G_THREAD_PRIORITY_URGENT);
350 #ifdef HAVE_PRIORITIES
351 # ifdef G_THREADS_IMPL_POSIX
353 struct sched_param sched;
355 posix_check_cmd (pthread_getschedparam (*(pthread_t*)thread, &policy,
357 sched.sched_priority = g_thread_priority_map [priority];
358 posix_check_cmd_prio (pthread_setschedparam (*(pthread_t*)thread, policy,
361 # else /* G_THREADS_IMPL_DCE */
362 posix_check_cmd_prio (pthread_setprio (*(pthread_t*)thread,
363 g_thread_priority_map [priority]));
365 #endif /* HAVE_PRIORITIES */
369 g_thread_self_posix_impl (gpointer thread)
371 *(pthread_t*)thread = pthread_self();
374 static GThreadFunctions g_thread_functions_for_glib_use_default =
376 g_mutex_new_posix_impl,
377 (void (*)(GMutex *)) pthread_mutex_lock,
378 g_mutex_trylock_posix_impl,
379 (void (*)(GMutex *)) pthread_mutex_unlock,
380 g_mutex_free_posix_impl,
381 g_cond_new_posix_impl,
382 (void (*)(GCond *)) pthread_cond_signal,
383 (void (*)(GCond *)) pthread_cond_broadcast,
384 (void (*)(GCond *, GMutex *)) pthread_cond_wait,
385 g_cond_timed_wait_posix_impl,
386 g_cond_free_posix_impl,
387 g_private_new_posix_impl,
388 g_private_get_posix_impl,
389 g_private_set_posix_impl,
390 g_thread_create_posix_impl,
391 g_thread_yield_posix_impl,
392 g_thread_join_posix_impl,
393 g_thread_exit_posix_impl,
394 g_thread_set_priority_posix_impl,
395 g_thread_self_posix_impl