| /* GLIB - Library of useful routines for C programming |
| * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald |
| * |
| * gthread.c: posix thread system implementation |
| * Copyright 1998 Sebastian Wilhelmi; University of Karlsruhe |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library 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 |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 02111-1307, USA. |
| */ |
| |
| /* |
| * Modified by the GLib Team and others 1997-2000. See the AUTHORS |
| * file for a list of people on the GLib Team. See the ChangeLog |
| * files for a list of changes. These files are distributed with |
| * GLib at ftp://ftp.gtk.org/pub/gtk/. |
| */ |
| |
| /* |
| * MT safe |
| */ |
| |
| #include "config.h" |
| |
| #include <pthread.h> |
| #include <errno.h> |
| #include <stdlib.h> |
| #ifdef HAVE_SYS_TIME_H |
| # include <sys/time.h> |
| #endif |
| #ifdef HAVE_UNISTD_H |
| # include <unistd.h> |
| #endif |
| |
| #ifdef HAVE_SCHED_H |
| #include <sched.h> |
| #endif |
| |
| #define posix_check_err(err, name) G_STMT_START{ \ |
| int error = (err); \ |
| if (error) \ |
| g_error ("file %s: line %d (%s): error '%s' during '%s'", \ |
| __FILE__, __LINE__, G_STRFUNC, \ |
| g_strerror (error), name); \ |
| }G_STMT_END |
| |
| #define posix_check_cmd(cmd) posix_check_err (posix_error (cmd), #cmd) |
| |
| #ifdef G_ENABLE_DEBUG |
| static gboolean posix_check_cmd_prio_warned = FALSE; |
| # define posix_check_cmd_prio(cmd) G_STMT_START{ \ |
| int err = posix_error (cmd); \ |
| if (err == EPERM) \ |
| { \ |
| if (!posix_check_cmd_prio_warned) \ |
| { \ |
| posix_check_cmd_prio_warned = TRUE; \ |
| g_warning ("Priorities can only be changed " \ |
| "(resp. increased) by root."); \ |
| } \ |
| } \ |
| else \ |
| posix_check_err (err, #cmd); \ |
| }G_STMT_END |
| #else /* G_ENABLE_DEBUG */ |
| # define posix_check_cmd_prio(cmd) G_STMT_START{ \ |
| int err = posix_error (cmd); \ |
| if (err != EPERM) \ |
| posix_check_err (err, #cmd); \ |
| }G_STMT_END |
| #endif /* G_ENABLE_DEBUG */ |
| |
| #if defined(G_THREADS_IMPL_POSIX) |
| # define posix_error(what) (what) |
| # define mutexattr_default NULL |
| # define condattr_default NULL |
| #elif defined(G_THREADS_IMPL_DCE) |
| # define posix_error(what) ((what) == -1 ? errno : 0) |
| # define pthread_key_create(a, b) pthread_keycreate (a, b) |
| # define pthread_attr_init(a) pthread_attr_create (a) |
| # define pthread_attr_destroy(a) pthread_attr_delete (a) |
| # define pthread_create(a, b, c, d) pthread_create (a, *b, c, d) |
| # define mutexattr_default (pthread_mutexattr_default) |
| # define condattr_default (pthread_condattr_default) |
| #else /* neither G_THREADS_IMPL_POSIX nor G_THREADS_IMPL_DCE are defined */ |
| # error This should not happen. Contact the GLib team. |
| #endif |
| |
| #if defined (POSIX_MIN_PRIORITY) && defined (POSIX_MAX_PRIORITY) |
| # define HAVE_PRIORITIES 1 |
| static gint priority_normal_value; |
| # ifdef __FreeBSD__ |
| /* FreeBSD threads use different priority values from the POSIX_ |
| * defines so we just set them here. The corresponding macros |
| * PTHREAD_MIN_PRIORITY and PTHREAD_MAX_PRIORITY are implied to be |
| * exported by the docs, but they aren't. |
| */ |
| # define PRIORITY_LOW_VALUE 0 |
| # define PRIORITY_URGENT_VALUE 31 |
| # else /* !__FreeBSD__ */ |
| # define PRIORITY_LOW_VALUE POSIX_MIN_PRIORITY |
| # define PRIORITY_URGENT_VALUE POSIX_MAX_PRIORITY |
| # endif /* !__FreeBSD__ */ |
| # define PRIORITY_NORMAL_VALUE priority_normal_value |
| #endif /* POSIX_MIN_PRIORITY && POSIX_MAX_PRIORITY */ |
| |
| static gulong g_thread_min_stack_size = 0; |
| |
| #define G_MUTEX_SIZE (sizeof (pthread_mutex_t)) |
| |
| #if defined(HAVE_CLOCK_GETTIME) && defined(HAVE_MONOTONIC_CLOCK) |
| #define USE_CLOCK_GETTIME 1 |
| static gint posix_clock = 0; |
| #endif |
| |
| #if defined(_SC_THREAD_STACK_MIN) || defined (HAVE_PRIORITIES) || defined (USE_CLOCK_GETTIME) |
| #define HAVE_G_THREAD_IMPL_INIT |
| static void |
| g_thread_impl_init(void) |
| { |
| #ifdef _SC_THREAD_STACK_MIN |
| g_thread_min_stack_size = MAX (sysconf (_SC_THREAD_STACK_MIN), 0); |
| #endif /* _SC_THREAD_STACK_MIN */ |
| #ifdef HAVE_PRIORITIES |
| # ifdef G_THREADS_IMPL_POSIX |
| { |
| struct sched_param sched; |
| int policy; |
| posix_check_cmd (pthread_getschedparam (pthread_self(), &policy, &sched)); |
| priority_normal_value = sched.sched_priority; |
| } |
| # else /* G_THREADS_IMPL_DCE */ |
| posix_check_cmd (priority_normal_value = |
| pthread_getprio (*(pthread_t*)thread, |
| g_thread_priority_map [priority])); |
| # endif |
| #endif /* HAVE_PRIORITIES */ |
| |
| #ifdef USE_CLOCK_GETTIME |
| if (sysconf (_SC_MONOTONIC_CLOCK) >= 0) |
| posix_clock = CLOCK_MONOTONIC; |
| else |
| posix_clock = CLOCK_REALTIME; |
| #endif |
| } |
| #endif /* _SC_THREAD_STACK_MIN || HAVE_PRIORITIES */ |
| |
| static GMutex * |
| g_mutex_new_posix_impl (void) |
| { |
| GMutex *result = (GMutex *) g_new (pthread_mutex_t, 1); |
| posix_check_cmd (pthread_mutex_init ((pthread_mutex_t *) result, |
| mutexattr_default)); |
| return result; |
| } |
| |
| static void |
| g_mutex_free_posix_impl (GMutex * mutex) |
| { |
| posix_check_cmd (pthread_mutex_destroy ((pthread_mutex_t *) mutex)); |
| g_free (mutex); |
| } |
| |
| /* NOTE: the functions g_mutex_lock and g_mutex_unlock may not use |
| functions from gmem.c and gmessages.c; */ |
| |
| /* pthread_mutex_lock, pthread_mutex_unlock can be taken directly, as |
| signature and semantic are right, but without error check then!!!!, |
| we might want to change this therefore. */ |
| |
| static gboolean |
| g_mutex_trylock_posix_impl (GMutex * mutex) |
| { |
| int result; |
| |
| result = pthread_mutex_trylock ((pthread_mutex_t *) mutex); |
| |
| #ifdef G_THREADS_IMPL_POSIX |
| if (result == EBUSY) |
| return FALSE; |
| #else /* G_THREADS_IMPL_DCE */ |
| if (result == 0) |
| return FALSE; |
| #endif |
| |
| posix_check_err (posix_error (result), "pthread_mutex_trylock"); |
| return TRUE; |
| } |
| |
| static GCond * |
| g_cond_new_posix_impl (void) |
| { |
| GCond *result = (GCond *) g_new (pthread_cond_t, 1); |
| posix_check_cmd (pthread_cond_init ((pthread_cond_t *) result, |
| condattr_default)); |
| return result; |
| } |
| |
| /* pthread_cond_signal, pthread_cond_broadcast and pthread_cond_wait |
| can be taken directly, as signature and semantic are right, but |
| without error check then!!!!, we might want to change this |
| therefore. */ |
| |
| #define G_NSEC_PER_SEC 1000000000 |
| |
| static gboolean |
| g_cond_timed_wait_posix_impl (GCond * cond, |
| GMutex * entered_mutex, |
| GTimeVal * abs_time) |
| { |
| int result; |
| struct timespec end_time; |
| gboolean timed_out; |
| |
| g_return_val_if_fail (cond != NULL, FALSE); |
| g_return_val_if_fail (entered_mutex != NULL, FALSE); |
| |
| if (!abs_time) |
| { |
| result = pthread_cond_wait ((pthread_cond_t *)cond, |
| (pthread_mutex_t *) entered_mutex); |
| timed_out = FALSE; |
| } |
| else |
| { |
| end_time.tv_sec = abs_time->tv_sec; |
| end_time.tv_nsec = abs_time->tv_usec * (G_NSEC_PER_SEC / G_USEC_PER_SEC); |
| |
| g_return_val_if_fail (end_time.tv_nsec < G_NSEC_PER_SEC, TRUE); |
| |
| result = pthread_cond_timedwait ((pthread_cond_t *) cond, |
| (pthread_mutex_t *) entered_mutex, |
| &end_time); |
| #ifdef G_THREADS_IMPL_POSIX |
| timed_out = (result == ETIMEDOUT); |
| #else /* G_THREADS_IMPL_DCE */ |
| timed_out = (result == -1) && (errno == EAGAIN); |
| #endif |
| } |
| |
| if (!timed_out) |
| posix_check_err (posix_error (result), "pthread_cond_timedwait"); |
| |
| return !timed_out; |
| } |
| |
| static void |
| g_cond_free_posix_impl (GCond * cond) |
| { |
| posix_check_cmd (pthread_cond_destroy ((pthread_cond_t *) cond)); |
| g_free (cond); |
| } |
| |
| static GPrivate * |
| g_private_new_posix_impl (GDestroyNotify destructor) |
| { |
| GPrivate *result = (GPrivate *) g_new (pthread_key_t, 1); |
| posix_check_cmd (pthread_key_create ((pthread_key_t *) result, destructor)); |
| return result; |
| } |
| |
| /* NOTE: the functions g_private_get and g_private_set may not use |
| functions from gmem.c and gmessages.c */ |
| |
| static void |
| g_private_set_posix_impl (GPrivate * private_key, gpointer value) |
| { |
| if (!private_key) |
| return; |
| pthread_setspecific (*(pthread_key_t *) private_key, value); |
| } |
| |
| static gpointer |
| g_private_get_posix_impl (GPrivate * private_key) |
| { |
| if (!private_key) |
| return NULL; |
| #ifdef G_THREADS_IMPL_POSIX |
| return pthread_getspecific (*(pthread_key_t *) private_key); |
| #else /* G_THREADS_IMPL_DCE */ |
| { |
| void* data; |
| posix_check_cmd (pthread_getspecific (*(pthread_key_t *) private_key, |
| &data)); |
| return data; |
| } |
| #endif |
| } |
| |
| static void |
| g_thread_create_posix_impl (GThreadFunc thread_func, |
| gpointer arg, |
| gulong stack_size, |
| gboolean joinable, |
| gboolean bound, |
| GThreadPriority priority, |
| gpointer thread, |
| GError **error) |
| { |
| pthread_attr_t attr; |
| gint ret; |
| |
| g_return_if_fail (thread_func); |
| g_return_if_fail (priority >= G_THREAD_PRIORITY_LOW); |
| g_return_if_fail (priority <= G_THREAD_PRIORITY_URGENT); |
| |
| posix_check_cmd (pthread_attr_init (&attr)); |
| |
| #ifdef HAVE_PTHREAD_ATTR_SETSTACKSIZE |
| if (stack_size) |
| { |
| stack_size = MAX (g_thread_min_stack_size, stack_size); |
| /* No error check here, because some systems can't do it and |
| * we simply don't want threads to fail because of that. */ |
| pthread_attr_setstacksize (&attr, stack_size); |
| } |
| #endif /* HAVE_PTHREAD_ATTR_SETSTACKSIZE */ |
| |
| #ifdef PTHREAD_SCOPE_SYSTEM |
| if (bound) |
| /* No error check here, because some systems can't do it and we |
| * simply don't want threads to fail because of that. */ |
| pthread_attr_setscope (&attr, PTHREAD_SCOPE_SYSTEM); |
| #endif /* PTHREAD_SCOPE_SYSTEM */ |
| |
| #ifdef G_THREADS_IMPL_POSIX |
| posix_check_cmd (pthread_attr_setdetachstate (&attr, |
| joinable ? PTHREAD_CREATE_JOINABLE : PTHREAD_CREATE_DETACHED)); |
| #endif /* G_THREADS_IMPL_POSIX */ |
| |
| #ifdef HAVE_PRIORITIES |
| # ifdef G_THREADS_IMPL_POSIX |
| { |
| struct sched_param sched; |
| posix_check_cmd (pthread_attr_getschedparam (&attr, &sched)); |
| sched.sched_priority = g_thread_priority_map [priority]; |
| posix_check_cmd_prio (pthread_attr_setschedparam (&attr, &sched)); |
| } |
| # else /* G_THREADS_IMPL_DCE */ |
| posix_check_cmd_prio |
| (pthread_attr_setprio (&attr, g_thread_priority_map [priority])); |
| # endif /* G_THREADS_IMPL_DCE */ |
| #endif /* HAVE_PRIORITIES */ |
| ret = posix_error (pthread_create (thread, &attr, |
| (void* (*)(void*))thread_func, arg)); |
| |
| posix_check_cmd (pthread_attr_destroy (&attr)); |
| |
| if (ret == EAGAIN) |
| { |
| g_set_error (error, G_THREAD_ERROR, G_THREAD_ERROR_AGAIN, |
| "Error creating thread: %s", g_strerror (ret)); |
| return; |
| } |
| |
| posix_check_err (ret, "pthread_create"); |
| |
| #ifdef G_THREADS_IMPL_DCE |
| if (!joinable) |
| posix_check_cmd (pthread_detach (thread)); |
| #endif /* G_THREADS_IMPL_DCE */ |
| } |
| |
| static void |
| g_thread_yield_posix_impl (void) |
| { |
| POSIX_YIELD_FUNC; |
| } |
| |
| static void |
| g_thread_join_posix_impl (gpointer thread) |
| { |
| gpointer ignore; |
| posix_check_cmd (pthread_join (*(pthread_t*)thread, &ignore)); |
| } |
| |
| static void |
| g_thread_exit_posix_impl (void) |
| { |
| pthread_exit (NULL); |
| } |
| |
| static void |
| g_thread_set_priority_posix_impl (gpointer thread, GThreadPriority priority) |
| { |
| g_return_if_fail (priority >= G_THREAD_PRIORITY_LOW); |
| g_return_if_fail (priority <= G_THREAD_PRIORITY_URGENT); |
| #ifdef HAVE_PRIORITIES |
| # ifdef G_THREADS_IMPL_POSIX |
| { |
| struct sched_param sched; |
| int policy; |
| posix_check_cmd (pthread_getschedparam (*(pthread_t*)thread, &policy, |
| &sched)); |
| sched.sched_priority = g_thread_priority_map [priority]; |
| posix_check_cmd_prio (pthread_setschedparam (*(pthread_t*)thread, policy, |
| &sched)); |
| } |
| # else /* G_THREADS_IMPL_DCE */ |
| posix_check_cmd_prio (pthread_setprio (*(pthread_t*)thread, |
| g_thread_priority_map [priority])); |
| # endif |
| #endif /* HAVE_PRIORITIES */ |
| } |
| |
| static void |
| g_thread_self_posix_impl (gpointer thread) |
| { |
| *(pthread_t*)thread = pthread_self(); |
| } |
| |
| static gboolean |
| g_thread_equal_posix_impl (gpointer thread1, gpointer thread2) |
| { |
| return (pthread_equal (*(pthread_t*)thread1, *(pthread_t*)thread2) != 0); |
| } |
| |
| #ifdef USE_CLOCK_GETTIME |
| static guint64 |
| gettime (void) |
| { |
| struct timespec tv; |
| |
| clock_gettime (posix_clock, &tv); |
| |
| return (guint64) tv.tv_sec * G_NSEC_PER_SEC + tv.tv_nsec; |
| } |
| static guint64 (*g_thread_gettime_impl)(void) = gettime; |
| #else |
| static guint64 (*g_thread_gettime_impl)(void) = 0; |
| #endif |
| |
| static GThreadFunctions g_thread_functions_for_glib_use_default = |
| { |
| g_mutex_new_posix_impl, |
| (void (*)(GMutex *)) pthread_mutex_lock, |
| g_mutex_trylock_posix_impl, |
| (void (*)(GMutex *)) pthread_mutex_unlock, |
| g_mutex_free_posix_impl, |
| g_cond_new_posix_impl, |
| (void (*)(GCond *)) pthread_cond_signal, |
| (void (*)(GCond *)) pthread_cond_broadcast, |
| (void (*)(GCond *, GMutex *)) pthread_cond_wait, |
| g_cond_timed_wait_posix_impl, |
| g_cond_free_posix_impl, |
| g_private_new_posix_impl, |
| g_private_get_posix_impl, |
| g_private_set_posix_impl, |
| g_thread_create_posix_impl, |
| g_thread_yield_posix_impl, |
| g_thread_join_posix_impl, |
| g_thread_exit_posix_impl, |
| g_thread_set_priority_posix_impl, |
| g_thread_self_posix_impl, |
| g_thread_equal_posix_impl |
| }; |