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715f94e951
glib/gthread/gthread-posix.c
Ryan Lortie 715f94e951 Remove support for DCE threads
2011-09-09 12:47:40 -04:00

389 lines
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C
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/* 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 */
#define posix_error(what) (what)
#define mutexattr_default NULL
#define condattr_default NULL
#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(_SC_THREAD_STACK_MIN) || defined (HAVE_PRIORITIES)
#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
{
struct sched_param sched;
int policy;
posix_check_cmd (pthread_getschedparam (pthread_self(), &policy, &sched));
priority_normal_value = sched.sched_priority;
}
#endif /* HAVE_PRIORITIES */
}
#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);
if (result == EBUSY)
return FALSE;
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);
timed_out = (result == ETIMEDOUT);
}
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;
return pthread_getspecific (*(pthread_key_t *) private_key);
}
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 */
posix_check_cmd (pthread_attr_setdetachstate (&attr,
joinable ? PTHREAD_CREATE_JOINABLE : PTHREAD_CREATE_DETACHED));
#ifdef HAVE_PRIORITIES
{
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));
}
#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");
}
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
{
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));
}
#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);
}
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
};
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