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glib/gthread/gthread-posix.c
Sebastian Wilhelmi a3036a5bd2 Add a surrogate for thread priorities using PID niceness for systems with 
2000-11-21  Sebastian Wilhelmi  <wilhelmi@ira.uka.de>

	* configure.in: Add a surrogate for thread priorities using PID
	niceness for systems with no thread priorities and different PIDs
	for threads of the same process (most notably: Linux). Define
	G_THREAD_USE_PID_SURROGATE in that case, as used by
	gthread-posix.c. Also make the system thread bigger by
	sizeof (long) to contain the thread's PID.

	* gfileutils.c: Include stdlib.h for mkstemp prototype.

	* gthread.c: Add priority range checks to the affected functions.

	* gthreadpool.c: Remove unused variable.

	* gthread-impl.c, gthread-posix.c, gthread-solaris.c: Removed
	g_thread_map_priority function in favour of the
	g_thread_priority_map array.  Initialize the array with
	PRIORITY_{...}_VALUE, if available and interpolate beetween the
	bounds if .._NORMAL_.. and .._HIGH_.. are not available.

	* gthread-posix.c: If we should use the PID niceness as a
	surrogate for thread priorities (G_THREAD_USE_PID_SURROGATE is
	defined), then disable normal priority handling and use PIDs and
	setpriority() instead. Depends on the thread to write its PID into
	the place after the thread id right after thread creation.
2000-11-21 15:27:44 +00:00

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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 <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 */
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
};
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