mirror of
https://gitlab.gnome.org/GNOME/glib.git
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e48573c402
g_thread_gettime() is an undocumented public function pointer that points to a function that returns the monotonic time in nanoseconds. g_get_monotonic_time() does the same in microseconds, so it can be used instead. GLib had one internal user in GFileMonitor that only cared about millisecond accuracy; it has been ported to g_get_monotonic_time().
441 lines
13 KiB
C
441 lines
13 KiB
C
/* GLIB - Library of useful routines for C programming
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* gthread.c: posix thread system implementation
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* Copyright 1998 Sebastian Wilhelmi; University of Karlsruhe
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* Modified by the GLib Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GLib Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GLib at ftp://ftp.gtk.org/pub/gtk/.
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*/
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/*
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* MT safe
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*/
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#include "config.h"
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#include <pthread.h>
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#include <errno.h>
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#include <stdlib.h>
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#ifdef HAVE_SYS_TIME_H
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# include <sys/time.h>
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#endif
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#ifdef HAVE_SCHED_H
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#include <sched.h>
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#endif
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#define posix_check_err(err, name) G_STMT_START{ \
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int error = (err); \
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if (error) \
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g_error ("file %s: line %d (%s): error '%s' during '%s'", \
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__FILE__, __LINE__, G_STRFUNC, \
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g_strerror (error), name); \
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}G_STMT_END
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#define posix_check_cmd(cmd) posix_check_err (posix_error (cmd), #cmd)
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#ifdef G_ENABLE_DEBUG
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static gboolean posix_check_cmd_prio_warned = FALSE;
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# define posix_check_cmd_prio(cmd) G_STMT_START{ \
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int err = posix_error (cmd); \
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if (err == EPERM) \
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{ \
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if (!posix_check_cmd_prio_warned) \
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{ \
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posix_check_cmd_prio_warned = TRUE; \
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g_warning ("Priorities can only be changed " \
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"(resp. increased) by root."); \
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} \
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} \
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else \
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posix_check_err (err, #cmd); \
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}G_STMT_END
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#else /* G_ENABLE_DEBUG */
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# define posix_check_cmd_prio(cmd) G_STMT_START{ \
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int err = posix_error (cmd); \
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if (err != EPERM) \
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posix_check_err (err, #cmd); \
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}G_STMT_END
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#endif /* G_ENABLE_DEBUG */
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#if defined(G_THREADS_IMPL_POSIX)
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# define posix_error(what) (what)
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# define mutexattr_default NULL
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# define condattr_default NULL
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#elif defined(G_THREADS_IMPL_DCE)
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# define posix_error(what) ((what) == -1 ? errno : 0)
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# define pthread_key_create(a, b) pthread_keycreate (a, b)
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# define pthread_attr_init(a) pthread_attr_create (a)
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# define pthread_attr_destroy(a) pthread_attr_delete (a)
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# define pthread_create(a, b, c, d) pthread_create (a, *b, c, d)
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# define mutexattr_default (pthread_mutexattr_default)
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# define condattr_default (pthread_condattr_default)
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#else /* neither G_THREADS_IMPL_POSIX nor G_THREADS_IMPL_DCE are defined */
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# error This should not happen. Contact the GLib team.
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#endif
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#if defined (POSIX_MIN_PRIORITY) && defined (POSIX_MAX_PRIORITY)
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# define HAVE_PRIORITIES 1
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static gint priority_normal_value;
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# ifdef __FreeBSD__
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/* FreeBSD threads use different priority values from the POSIX_
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* defines so we just set them here. The corresponding macros
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* PTHREAD_MIN_PRIORITY and PTHREAD_MAX_PRIORITY are implied to be
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* exported by the docs, but they aren't.
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*/
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# define PRIORITY_LOW_VALUE 0
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# define PRIORITY_URGENT_VALUE 31
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# else /* !__FreeBSD__ */
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# define PRIORITY_LOW_VALUE POSIX_MIN_PRIORITY
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# define PRIORITY_URGENT_VALUE POSIX_MAX_PRIORITY
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# endif /* !__FreeBSD__ */
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# define PRIORITY_NORMAL_VALUE priority_normal_value
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#endif /* POSIX_MIN_PRIORITY && POSIX_MAX_PRIORITY */
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static gulong g_thread_min_stack_size = 0;
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#define G_MUTEX_SIZE (sizeof (pthread_mutex_t))
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#if defined(_SC_THREAD_STACK_MIN) || defined (HAVE_PRIORITIES)
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#define HAVE_G_THREAD_IMPL_INIT
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static void
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g_thread_impl_init(void)
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{
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#ifdef _SC_THREAD_STACK_MIN
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g_thread_min_stack_size = MAX (sysconf (_SC_THREAD_STACK_MIN), 0);
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#endif /* _SC_THREAD_STACK_MIN */
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#ifdef HAVE_PRIORITIES
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# ifdef G_THREADS_IMPL_POSIX
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{
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struct sched_param sched;
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int policy;
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posix_check_cmd (pthread_getschedparam (pthread_self(), &policy, &sched));
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priority_normal_value = sched.sched_priority;
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}
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# else /* G_THREADS_IMPL_DCE */
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posix_check_cmd (priority_normal_value =
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pthread_getprio (*(pthread_t*)thread,
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g_thread_priority_map [priority]));
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# endif
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#endif /* HAVE_PRIORITIES */
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}
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#endif /* _SC_THREAD_STACK_MIN || HAVE_PRIORITIES */
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static GMutex *
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g_mutex_new_posix_impl (void)
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{
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GMutex *result = (GMutex *) g_new (pthread_mutex_t, 1);
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posix_check_cmd (pthread_mutex_init ((pthread_mutex_t *) result,
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mutexattr_default));
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return result;
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}
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static void
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g_mutex_free_posix_impl (GMutex * mutex)
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{
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posix_check_cmd (pthread_mutex_destroy ((pthread_mutex_t *) mutex));
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g_free (mutex);
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}
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/* NOTE: the functions g_mutex_lock and g_mutex_unlock may not use
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functions from gmem.c and gmessages.c; */
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/* pthread_mutex_lock, pthread_mutex_unlock can be taken directly, as
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signature and semantic are right, but without error check then!!!!,
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we might want to change this therefore. */
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static gboolean
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g_mutex_trylock_posix_impl (GMutex * mutex)
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{
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int result;
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result = pthread_mutex_trylock ((pthread_mutex_t *) mutex);
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#ifdef G_THREADS_IMPL_POSIX
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if (result == EBUSY)
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return FALSE;
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#else /* G_THREADS_IMPL_DCE */
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if (result == 0)
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return FALSE;
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#endif
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posix_check_err (posix_error (result), "pthread_mutex_trylock");
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return TRUE;
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}
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static GCond *
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g_cond_new_posix_impl (void)
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{
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GCond *result = (GCond *) g_new (pthread_cond_t, 1);
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posix_check_cmd (pthread_cond_init ((pthread_cond_t *) result,
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condattr_default));
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return result;
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}
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/* pthread_cond_signal, pthread_cond_broadcast and pthread_cond_wait
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can be taken directly, as signature and semantic are right, but
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without error check then!!!!, we might want to change this
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therefore. */
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#define G_NSEC_PER_SEC 1000000000
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static gboolean
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g_cond_timed_wait_posix_impl (GCond * cond,
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GMutex * entered_mutex,
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GTimeVal * abs_time)
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{
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int result;
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struct timespec end_time;
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gboolean timed_out;
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g_return_val_if_fail (cond != NULL, FALSE);
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g_return_val_if_fail (entered_mutex != NULL, FALSE);
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if (!abs_time)
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{
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result = pthread_cond_wait ((pthread_cond_t *)cond,
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(pthread_mutex_t *) entered_mutex);
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timed_out = FALSE;
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}
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else
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{
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end_time.tv_sec = abs_time->tv_sec;
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end_time.tv_nsec = abs_time->tv_usec * (G_NSEC_PER_SEC / G_USEC_PER_SEC);
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g_return_val_if_fail (end_time.tv_nsec < G_NSEC_PER_SEC, TRUE);
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result = pthread_cond_timedwait ((pthread_cond_t *) cond,
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(pthread_mutex_t *) entered_mutex,
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&end_time);
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#ifdef G_THREADS_IMPL_POSIX
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timed_out = (result == ETIMEDOUT);
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#else /* G_THREADS_IMPL_DCE */
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timed_out = (result == -1) && (errno == EAGAIN);
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#endif
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}
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if (!timed_out)
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posix_check_err (posix_error (result), "pthread_cond_timedwait");
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return !timed_out;
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}
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static void
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g_cond_free_posix_impl (GCond * cond)
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{
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posix_check_cmd (pthread_cond_destroy ((pthread_cond_t *) cond));
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g_free (cond);
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}
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static GPrivate *
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g_private_new_posix_impl (GDestroyNotify destructor)
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{
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GPrivate *result = (GPrivate *) g_new (pthread_key_t, 1);
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posix_check_cmd (pthread_key_create ((pthread_key_t *) result, destructor));
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return result;
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}
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/* NOTE: the functions g_private_get and g_private_set may not use
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functions from gmem.c and gmessages.c */
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static void
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g_private_set_posix_impl (GPrivate * private_key, gpointer value)
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{
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if (!private_key)
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return;
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pthread_setspecific (*(pthread_key_t *) private_key, value);
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}
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static gpointer
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g_private_get_posix_impl (GPrivate * private_key)
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{
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if (!private_key)
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return NULL;
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#ifdef G_THREADS_IMPL_POSIX
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return pthread_getspecific (*(pthread_key_t *) private_key);
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#else /* G_THREADS_IMPL_DCE */
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{
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void* data;
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posix_check_cmd (pthread_getspecific (*(pthread_key_t *) private_key,
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&data));
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return data;
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}
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#endif
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}
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static void
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g_thread_create_posix_impl (GThreadFunc thread_func,
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gpointer arg,
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gulong stack_size,
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gboolean joinable,
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gboolean bound,
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GThreadPriority priority,
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gpointer thread,
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GError **error)
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{
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pthread_attr_t attr;
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gint ret;
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g_return_if_fail (thread_func);
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g_return_if_fail (priority >= G_THREAD_PRIORITY_LOW);
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g_return_if_fail (priority <= G_THREAD_PRIORITY_URGENT);
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posix_check_cmd (pthread_attr_init (&attr));
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#ifdef HAVE_PTHREAD_ATTR_SETSTACKSIZE
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if (stack_size)
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{
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stack_size = MAX (g_thread_min_stack_size, stack_size);
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/* No error check here, because some systems can't do it and
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* we simply don't want threads to fail because of that. */
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pthread_attr_setstacksize (&attr, stack_size);
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}
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#endif /* HAVE_PTHREAD_ATTR_SETSTACKSIZE */
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#ifdef PTHREAD_SCOPE_SYSTEM
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if (bound)
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/* No error check here, because some systems can't do it and we
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* simply don't want threads to fail because of that. */
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pthread_attr_setscope (&attr, PTHREAD_SCOPE_SYSTEM);
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#endif /* PTHREAD_SCOPE_SYSTEM */
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#ifdef G_THREADS_IMPL_POSIX
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posix_check_cmd (pthread_attr_setdetachstate (&attr,
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joinable ? PTHREAD_CREATE_JOINABLE : PTHREAD_CREATE_DETACHED));
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#endif /* G_THREADS_IMPL_POSIX */
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#ifdef HAVE_PRIORITIES
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# ifdef G_THREADS_IMPL_POSIX
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{
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struct sched_param sched;
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posix_check_cmd (pthread_attr_getschedparam (&attr, &sched));
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sched.sched_priority = g_thread_priority_map [priority];
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posix_check_cmd_prio (pthread_attr_setschedparam (&attr, &sched));
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}
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# else /* G_THREADS_IMPL_DCE */
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posix_check_cmd_prio
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(pthread_attr_setprio (&attr, g_thread_priority_map [priority]));
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# endif /* G_THREADS_IMPL_DCE */
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#endif /* HAVE_PRIORITIES */
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ret = posix_error (pthread_create (thread, &attr,
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(void* (*)(void*))thread_func, arg));
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posix_check_cmd (pthread_attr_destroy (&attr));
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if (ret == EAGAIN)
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{
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g_set_error (error, G_THREAD_ERROR, G_THREAD_ERROR_AGAIN,
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"Error creating thread: %s", g_strerror (ret));
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return;
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}
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posix_check_err (ret, "pthread_create");
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#ifdef G_THREADS_IMPL_DCE
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if (!joinable)
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posix_check_cmd (pthread_detach (thread));
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#endif /* G_THREADS_IMPL_DCE */
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}
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static void
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g_thread_yield_posix_impl (void)
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{
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POSIX_YIELD_FUNC;
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}
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static void
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g_thread_join_posix_impl (gpointer thread)
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{
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gpointer ignore;
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posix_check_cmd (pthread_join (*(pthread_t*)thread, &ignore));
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}
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static void
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g_thread_exit_posix_impl (void)
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{
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pthread_exit (NULL);
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}
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static void
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g_thread_set_priority_posix_impl (gpointer thread, GThreadPriority priority)
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{
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g_return_if_fail (priority >= G_THREAD_PRIORITY_LOW);
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g_return_if_fail (priority <= G_THREAD_PRIORITY_URGENT);
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#ifdef HAVE_PRIORITIES
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# ifdef G_THREADS_IMPL_POSIX
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{
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struct sched_param sched;
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int policy;
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posix_check_cmd (pthread_getschedparam (*(pthread_t*)thread, &policy,
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&sched));
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sched.sched_priority = g_thread_priority_map [priority];
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posix_check_cmd_prio (pthread_setschedparam (*(pthread_t*)thread, policy,
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&sched));
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}
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# else /* G_THREADS_IMPL_DCE */
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posix_check_cmd_prio (pthread_setprio (*(pthread_t*)thread,
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g_thread_priority_map [priority]));
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# endif
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#endif /* HAVE_PRIORITIES */
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}
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static void
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g_thread_self_posix_impl (gpointer thread)
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{
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*(pthread_t*)thread = pthread_self();
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}
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static gboolean
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g_thread_equal_posix_impl (gpointer thread1, gpointer thread2)
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{
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return (pthread_equal (*(pthread_t*)thread1, *(pthread_t*)thread2) != 0);
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}
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static GThreadFunctions g_thread_functions_for_glib_use_default =
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{
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g_mutex_new_posix_impl,
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(void (*)(GMutex *)) pthread_mutex_lock,
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g_mutex_trylock_posix_impl,
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(void (*)(GMutex *)) pthread_mutex_unlock,
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g_mutex_free_posix_impl,
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g_cond_new_posix_impl,
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(void (*)(GCond *)) pthread_cond_signal,
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(void (*)(GCond *)) pthread_cond_broadcast,
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(void (*)(GCond *, GMutex *)) pthread_cond_wait,
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g_cond_timed_wait_posix_impl,
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g_cond_free_posix_impl,
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g_private_new_posix_impl,
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g_private_get_posix_impl,
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g_private_set_posix_impl,
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g_thread_create_posix_impl,
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g_thread_yield_posix_impl,
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g_thread_join_posix_impl,
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g_thread_exit_posix_impl,
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g_thread_set_priority_posix_impl,
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g_thread_self_posix_impl,
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g_thread_equal_posix_impl
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};
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