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/.
39 #ifdef HAVE_SYS_TIME_H
40 # include <sys/time.h>
50 #define posix_check_err(err, name) G_STMT_START{ \
53 g_error ("file %s: line %d (%s): error '%s' during '%s'", \
54 __FILE__, __LINE__, G_STRFUNC, \
55 g_strerror (error), name); \
58 #define posix_check_cmd(cmd) posix_check_err (posix_error (cmd), #cmd)
61 static gboolean posix_check_cmd_prio_warned
= FALSE
;
62 # define posix_check_cmd_prio(cmd) G_STMT_START{ \
63 int err = posix_error (cmd); \
66 if (!posix_check_cmd_prio_warned) \
68 posix_check_cmd_prio_warned = TRUE; \
69 g_warning ("Priorities can only be changed " \
70 "(resp. increased) by root."); \
74 posix_check_err (err, #cmd); \
76 #else /* G_ENABLE_DEBUG */
77 # define posix_check_cmd_prio(cmd) G_STMT_START{ \
78 int err = posix_error (cmd); \
80 posix_check_err (err, #cmd); \
82 #endif /* G_ENABLE_DEBUG */
84 #if defined(G_THREADS_IMPL_POSIX)
85 # define posix_error(what) (what)
86 # define mutexattr_default NULL
87 # define condattr_default NULL
88 #elif defined(G_THREADS_IMPL_DCE)
89 # define posix_error(what) ((what) == -1 ? errno : 0)
90 # define pthread_key_create(a, b) pthread_keycreate (a, b)
91 # define pthread_attr_init(a) pthread_attr_create (a)
92 # define pthread_attr_destroy(a) pthread_attr_delete (a)
93 # define pthread_create(a, b, c, d) pthread_create (a, *b, c, d)
94 # define mutexattr_default (pthread_mutexattr_default)
95 # define condattr_default (pthread_condattr_default)
96 #else /* neither G_THREADS_IMPL_POSIX nor G_THREADS_IMPL_DCE are defined */
97 # error This should not happen. Contact the GLib team.
100 #if defined (POSIX_MIN_PRIORITY) && defined (POSIX_MAX_PRIORITY)
101 # define HAVE_PRIORITIES 1
102 static gint priority_normal_value
;
104 /* FreeBSD threads use different priority values from the POSIX_
105 * defines so we just set them here. The corresponding macros
106 * PTHREAD_MIN_PRIORITY and PTHREAD_MAX_PRIORITY are implied to be
107 * exported by the docs, but they aren't.
109 # define PRIORITY_LOW_VALUE 0
110 # define PRIORITY_URGENT_VALUE 31
111 # else /* !__FreeBSD__ */
112 # define PRIORITY_LOW_VALUE POSIX_MIN_PRIORITY
113 # define PRIORITY_URGENT_VALUE POSIX_MAX_PRIORITY
114 # endif /* !__FreeBSD__ */
115 # define PRIORITY_NORMAL_VALUE priority_normal_value
116 #endif /* POSIX_MIN_PRIORITY && POSIX_MAX_PRIORITY */
118 static gulong g_thread_min_stack_size
= 0;
120 #define G_MUTEX_SIZE (sizeof (pthread_mutex_t))
122 #if defined(HAVE_CLOCK_GETTIME) && defined(HAVE_MONOTONIC_CLOCK)
123 #define USE_CLOCK_GETTIME 1
124 static gint posix_clock
= 0;
127 #if defined(_SC_THREAD_STACK_MIN) || defined (HAVE_PRIORITIES) || defined (USE_CLOCK_GETTIME)
128 #define HAVE_G_THREAD_IMPL_INIT
130 g_thread_impl_init(void)
132 #ifdef _SC_THREAD_STACK_MIN
133 g_thread_min_stack_size
= MAX (sysconf (_SC_THREAD_STACK_MIN
), 0);
134 #endif /* _SC_THREAD_STACK_MIN */
135 #ifdef HAVE_PRIORITIES
136 # ifdef G_THREADS_IMPL_POSIX
138 struct sched_param sched
;
140 posix_check_cmd (pthread_getschedparam (pthread_self(), &policy
, &sched
));
141 priority_normal_value
= sched
.sched_priority
;
143 # else /* G_THREADS_IMPL_DCE */
144 posix_check_cmd (priority_normal_value
=
145 pthread_getprio (*(pthread_t
*)thread
,
146 g_thread_priority_map
[priority
]));
148 #endif /* HAVE_PRIORITIES */
150 #ifdef USE_CLOCK_GETTIME
151 if (sysconf (_SC_MONOTONIC_CLOCK
) >= 0)
152 posix_clock
= CLOCK_MONOTONIC
;
154 posix_clock
= CLOCK_REALTIME
;
157 #endif /* _SC_THREAD_STACK_MIN || HAVE_PRIORITIES */
160 g_mutex_new_posix_impl (void)
162 GMutex
*result
= (GMutex
*) g_new (pthread_mutex_t
, 1);
163 posix_check_cmd (pthread_mutex_init ((pthread_mutex_t
*) result
,
169 g_mutex_free_posix_impl (GMutex
* mutex
)
171 posix_check_cmd (pthread_mutex_destroy ((pthread_mutex_t
*) mutex
));
175 /* NOTE: the functions g_mutex_lock and g_mutex_unlock may not use
176 functions from gmem.c and gmessages.c; */
178 /* pthread_mutex_lock, pthread_mutex_unlock can be taken directly, as
179 signature and semantic are right, but without error check then!!!!,
180 we might want to change this therefore. */
183 g_mutex_trylock_posix_impl (GMutex
* mutex
)
187 result
= pthread_mutex_trylock ((pthread_mutex_t
*) mutex
);
189 #ifdef G_THREADS_IMPL_POSIX
192 #else /* G_THREADS_IMPL_DCE */
197 posix_check_err (posix_error (result
), "pthread_mutex_trylock");
202 g_cond_new_posix_impl (void)
204 GCond
*result
= (GCond
*) g_new (pthread_cond_t
, 1);
205 posix_check_cmd (pthread_cond_init ((pthread_cond_t
*) result
,
210 /* pthread_cond_signal, pthread_cond_broadcast and pthread_cond_wait
211 can be taken directly, as signature and semantic are right, but
212 without error check then!!!!, we might want to change this
215 #define G_NSEC_PER_SEC 1000000000
218 g_cond_timed_wait_posix_impl (GCond
* cond
,
219 GMutex
* entered_mutex
,
223 struct timespec end_time
;
226 g_return_val_if_fail (cond
!= NULL
, FALSE
);
227 g_return_val_if_fail (entered_mutex
!= NULL
, FALSE
);
231 result
= pthread_cond_wait ((pthread_cond_t
*)cond
,
232 (pthread_mutex_t
*) entered_mutex
);
237 end_time
.tv_sec
= abs_time
->tv_sec
;
238 end_time
.tv_nsec
= abs_time
->tv_usec
* (G_NSEC_PER_SEC
/ G_USEC_PER_SEC
);
240 g_return_val_if_fail (end_time
.tv_nsec
< G_NSEC_PER_SEC
, TRUE
);
242 result
= pthread_cond_timedwait ((pthread_cond_t
*) cond
,
243 (pthread_mutex_t
*) entered_mutex
,
245 #ifdef G_THREADS_IMPL_POSIX
246 timed_out
= (result
== ETIMEDOUT
);
247 #else /* G_THREADS_IMPL_DCE */
248 timed_out
= (result
== -1) && (errno
== EAGAIN
);
253 posix_check_err (posix_error (result
), "pthread_cond_timedwait");
259 g_cond_free_posix_impl (GCond
* cond
)
261 posix_check_cmd (pthread_cond_destroy ((pthread_cond_t
*) cond
));
266 g_private_new_posix_impl (GDestroyNotify destructor
)
268 GPrivate
*result
= (GPrivate
*) g_new (pthread_key_t
, 1);
269 posix_check_cmd (pthread_key_create ((pthread_key_t
*) result
, destructor
));
273 /* NOTE: the functions g_private_get and g_private_set may not use
274 functions from gmem.c and gmessages.c */
277 g_private_set_posix_impl (GPrivate
* private_key
, gpointer value
)
281 pthread_setspecific (*(pthread_key_t
*) private_key
, value
);
285 g_private_get_posix_impl (GPrivate
* private_key
)
289 #ifdef G_THREADS_IMPL_POSIX
290 return pthread_getspecific (*(pthread_key_t
*) private_key
);
291 #else /* G_THREADS_IMPL_DCE */
294 posix_check_cmd (pthread_getspecific (*(pthread_key_t
*) private_key
,
302 g_thread_create_posix_impl (GThreadFunc thread_func
,
307 GThreadPriority priority
,
314 g_return_if_fail (thread_func
);
315 g_return_if_fail (priority
>= G_THREAD_PRIORITY_LOW
);
316 g_return_if_fail (priority
<= G_THREAD_PRIORITY_URGENT
);
318 posix_check_cmd (pthread_attr_init (&attr
));
320 #ifdef HAVE_PTHREAD_ATTR_SETSTACKSIZE
323 stack_size
= MAX (g_thread_min_stack_size
, stack_size
);
324 /* No error check here, because some systems can't do it and
325 * we simply don't want threads to fail because of that. */
326 pthread_attr_setstacksize (&attr
, stack_size
);
328 #endif /* HAVE_PTHREAD_ATTR_SETSTACKSIZE */
330 #ifdef PTHREAD_SCOPE_SYSTEM
332 /* No error check here, because some systems can't do it and we
333 * simply don't want threads to fail because of that. */
334 pthread_attr_setscope (&attr
, PTHREAD_SCOPE_SYSTEM
);
335 #endif /* PTHREAD_SCOPE_SYSTEM */
337 #ifdef G_THREADS_IMPL_POSIX
338 posix_check_cmd (pthread_attr_setdetachstate (&attr
,
339 joinable
? PTHREAD_CREATE_JOINABLE
: PTHREAD_CREATE_DETACHED
));
340 #endif /* G_THREADS_IMPL_POSIX */
342 #ifdef HAVE_PRIORITIES
343 # ifdef G_THREADS_IMPL_POSIX
345 struct sched_param sched
;
346 posix_check_cmd (pthread_attr_getschedparam (&attr
, &sched
));
347 sched
.sched_priority
= g_thread_priority_map
[priority
];
348 posix_check_cmd_prio (pthread_attr_setschedparam (&attr
, &sched
));
350 # else /* G_THREADS_IMPL_DCE */
352 (pthread_attr_setprio (&attr
, g_thread_priority_map
[priority
]));
353 # endif /* G_THREADS_IMPL_DCE */
354 #endif /* HAVE_PRIORITIES */
355 ret
= posix_error (pthread_create (thread
, &attr
,
356 (void* (*)(void*))thread_func
, arg
));
358 posix_check_cmd (pthread_attr_destroy (&attr
));
362 g_set_error (error
, G_THREAD_ERROR
, G_THREAD_ERROR_AGAIN
,
363 "Error creating thread: %s", g_strerror (ret
));
367 posix_check_err (ret
, "pthread_create");
369 #ifdef G_THREADS_IMPL_DCE
371 posix_check_cmd (pthread_detach (thread
));
372 #endif /* G_THREADS_IMPL_DCE */
376 g_thread_yield_posix_impl (void)
382 g_thread_join_posix_impl (gpointer thread
)
385 posix_check_cmd (pthread_join (*(pthread_t
*)thread
, &ignore
));
389 g_thread_exit_posix_impl (void)
395 g_thread_set_priority_posix_impl (gpointer thread
, GThreadPriority priority
)
397 g_return_if_fail (priority
>= G_THREAD_PRIORITY_LOW
);
398 g_return_if_fail (priority
<= G_THREAD_PRIORITY_URGENT
);
399 #ifdef HAVE_PRIORITIES
400 # ifdef G_THREADS_IMPL_POSIX
402 struct sched_param sched
;
404 posix_check_cmd (pthread_getschedparam (*(pthread_t
*)thread
, &policy
,
406 sched
.sched_priority
= g_thread_priority_map
[priority
];
407 posix_check_cmd_prio (pthread_setschedparam (*(pthread_t
*)thread
, policy
,
410 # else /* G_THREADS_IMPL_DCE */
411 posix_check_cmd_prio (pthread_setprio (*(pthread_t
*)thread
,
412 g_thread_priority_map
[priority
]));
414 #endif /* HAVE_PRIORITIES */
418 g_thread_self_posix_impl (gpointer thread
)
420 *(pthread_t
*)thread
= pthread_self();
424 g_thread_equal_posix_impl (gpointer thread1
, gpointer thread2
)
426 return (pthread_equal (*(pthread_t
*)thread1
, *(pthread_t
*)thread2
) != 0);
429 #ifdef USE_CLOCK_GETTIME
435 clock_gettime (posix_clock
, &tv
);
437 return (guint64
) tv
.tv_sec
* G_NSEC_PER_SEC
+ tv
.tv_nsec
;
439 static guint64 (*g_thread_gettime_impl
)(void) = gettime
;
441 static guint64 (*g_thread_gettime_impl
)(void) = 0;
444 static GThreadFunctions g_thread_functions_for_glib_use_default
=
446 g_mutex_new_posix_impl
,
447 (void (*)(GMutex
*)) pthread_mutex_lock
,
448 g_mutex_trylock_posix_impl
,
449 (void (*)(GMutex
*)) pthread_mutex_unlock
,
450 g_mutex_free_posix_impl
,
451 g_cond_new_posix_impl
,
452 (void (*)(GCond
*)) pthread_cond_signal
,
453 (void (*)(GCond
*)) pthread_cond_broadcast
,
454 (void (*)(GCond
*, GMutex
*)) pthread_cond_wait
,
455 g_cond_timed_wait_posix_impl
,
456 g_cond_free_posix_impl
,
457 g_private_new_posix_impl
,
458 g_private_get_posix_impl
,
459 g_private_set_posix_impl
,
460 g_thread_create_posix_impl
,
461 g_thread_yield_posix_impl
,
462 g_thread_join_posix_impl
,
463 g_thread_exit_posix_impl
,
464 g_thread_set_priority_posix_impl
,
465 g_thread_self_posix_impl
,
466 g_thread_equal_posix_impl