/* 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 Library 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library 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 1997-1999. 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 #define posix_print_error( name, num ) \ g_error( "file %s: line %d (%s): error %s during %s", \ __FILE__, __LINE__, G_GNUC_PRETTY_FUNCTION, \ g_strerror((num)), #name ) #if defined(G_THREADS_IMPL_POSIX) # define posix_check_for_error( what ) G_STMT_START{ \ int error = (what); \ if( error ) { posix_print_error( what, error ); } \ }G_STMT_END # define mutexattr_default NULL # define condattr_default NULL #elif defined(G_THREADS_IMPL_DCE) # define posix_check_for_error( what ) G_STMT_START{ \ if( (what) == -1 ) { posix_print_error( what, errno ); } \ }G_STMT_END # 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 GLb team. #endif static GMutex * g_mutex_new_posix_impl (void) { GMutex *result = (GMutex *) g_new (pthread_mutex_t, 1); posix_check_for_error (pthread_mutex_init ((pthread_mutex_t *) result, mutexattr_default)); return result; } static void g_mutex_free_posix_impl (GMutex * mutex) { posix_check_for_error (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_for_error (result); return TRUE; } static GCond * g_cond_new_posix_impl (void) { GCond *result = (GCond *) g_new (pthread_cond_t, 1); posix_check_for_error (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_MICROSEC 1000000 #define G_NANOSEC 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_NANOSEC / G_MICROSEC); g_assert (end_time.tv_nsec < G_NANOSEC); 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_for_error (result); return !timed_out; } static void g_cond_free_posix_impl (GCond * cond) { posix_check_for_error (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_for_error (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_for_error (pthread_getspecific (*(pthread_key_t *) private_key, &data)); return data; } #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 };