/* 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 #include #include #ifdef HAVE_SYS_TIME_H # include #endif #ifdef HAVE_UNISTD_H # include #endif #ifdef HAVE_SCHED_H #include #endif #ifdef G_THREAD_USE_PID_SURROGATE # include # define PID_IN_THREAD(thread) (*(pid_t*)(((gchar*)thread)+sizeof(pthread_t))) # define SET_PRIO(pid, prio) \ posix_check_cmd_prio ((setpriority (PRIO_PROCESS, (pid), \ g_thread_priority_map [prio]) == -1) ? \ (errno == EACCES ? EPERM : errno ): 0) #endif /* G_THREAD_USE_PID_SURROGATE */ #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_GNUC_PRETTY_FUNCTION, \ 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 #ifdef G_THREAD_USE_PID_SURROGATE # define PRIORITY_LOW_VALUE 15 # define PRIORITY_NORMAL_VALUE 0 # define PRIORITY_HIGH_VALUE -15 # define PRIORITY_URGENT_VALUE -20 #elif defined (POSIX_MIN_PRIORITY) && defined (POSIX_MAX_PRIORITY) # define HAVE_PRIORITIES 1 # define PRIORITY_LOW_VALUE POSIX_MIN_PRIORITY # define PRIORITY_URGENT_VALUE POSIX_MAX_PRIORITY #endif /* POSIX_MIN_PRIORITY && POSIX_MAX_PRIORITY */ gulong g_thread_min_stack_size = 0; #define G_MUTEX_SIZE (sizeof (pthread_mutex_t)) #ifdef _SC_THREAD_STACK_MIN #define HAVE_G_THREAD_IMPL_INIT static void g_thread_impl_init() { g_thread_min_stack_size = MAX (sysconf (_SC_THREAD_STACK_MIN), 0); } #endif /* _SC_THREAD_STACK_MIN */ 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 therfore. */ #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) { g_cond_wait (cond, entered_mutex); return TRUE; } 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_assert (end_time.tv_nsec < G_NSEC_PER_SEC); 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 } #ifdef G_THREAD_USE_PID_SURROGATE struct proxy_data { GThreadFunc thread_func; gpointer arg; gpointer thread; GThreadPriority priority; }; static void g_thread_create_posix_impl_proxy (struct proxy_data *data) { GThreadFunc thread_func = data->thread_func; GThreadFunc arg = data->arg; PID_IN_THREAD (data->thread) = getpid(); SET_PRIO (PID_IN_THREAD (data->thread), data->priority); g_free (data); thread_func (arg); } #endif /* G_THREAD_USE_PID_SURROGATE */ 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); posix_check_cmd (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 G_THREAD_USE_PID_SURROGATE { struct proxy_data *data = g_new (struct proxy_data, 1); data->thread_func = thread_func; data->arg = arg; data->thread = thread; data->priority = priority; PID_IN_THREAD (thread) = 0; ret = posix_error (pthread_create (thread, &attr, (void* (*)(void*)) g_thread_create_posix_impl_proxy, data)); } #else /* G_THREAD_USE_PID_SURROGATE */ # 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)); #endif /* !G_THREAD_USE_PID_SURROGATE */ 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 #elif defined (G_THREAD_USE_PID_SURROGATE) /* If the addressed thread hasn't yet been able to provide it's pid, * we ignore the request. Should be more than rare */ if (PID_IN_THREAD (thread) != 0) SET_PRIO (PID_IN_THREAD (thread), priority); #endif /* G_THREAD_USE_PID_SURROGATE */ } static void g_thread_self_posix_impl (gpointer thread) { *(pthread_t*)thread = pthread_self(); #ifdef G_THREAD_USE_PID_SURROGATE PID_IN_THREAD (thread) = getpid(); #endif /* G_THREAD_USE_PID_SURROGATE */ } 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 };