glib/gthread/gthread-posix.c
Sebastian Wilhelmi b1d840c20a Made g_thread_min_stack_size static.
2001-01-03  Sebastian Wilhelmi  <wilhelmi@ira.uka.de>

        * gthread-solaris.c, gthread-posix.c: Made g_thread_min_stack_size
        static.

2CVS: ----------------------------------------------------------------------
2001-01-03 17:00:43 +00:00

454 lines
13 KiB
C

/* 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 <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
#ifdef G_THREAD_USE_PID_SURROGATE
# include <sys/resource.h>
# 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 */
static 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
};