glib/gthread.c
Tor Lillqvist be80f9a106 Update the pthreads snapshot version we want. Advice how to hand-expand
* README.win32: Update the pthreads snapshot version we want.
	Advice how to hand-expand the makefile.*.in files.

	* config.h.win32.in: Define values needed by Sebastian Wilhelmi's
	new thread stuff.

	* glib.def: Add new functions.

	* glibconfig.h.win32.in: Update the pthreads snapshot version.
	Fix typo.

	* gthread.c: Include config.h, guard inclusion of unistd.h.  When
 	using gcc on Win32, g_thread_functions_for_glib_use must be marked
 	for export here, too.

	* gtimer.c: Implement g_usleep on native Win32 using Sleep (which
	only has millisecond granularity, though).

	* makefile.cygwin.in
	* makefile.msc.in: Update pthreads snapshot version. File
	name changes. Remove testgthread.

	* tests/makefile.cygwin.in
	* tests/makefile.msc.in: Add thread-test. Link with gthread lib.

	* gthread-posix.c: Guard pthread_attr_setscope call with test
	for _POSIX_THREAD_PRIORITY_SCHEDULING, which should be defined
	in a <pthread.h> that supports that feature.
1999-06-20 22:20:43 +00:00

543 lines
14 KiB
C

/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* gmutex.c: MT safety related functions
* Copyright 1998 Sebastian Wilhelmi; University of Karlsruhe
* Owen Taylor
*
* 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 "config.h"
#include "glib.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
typedef struct _GRealThread GRealThread;
struct _GRealThread
{
GThread thread;
GThreadFunc func;
gpointer arg;
gpointer system_thread;
gpointer private_data;
};
typedef struct _GStaticPrivateNode GStaticPrivateNode;
struct _GStaticPrivateNode
{
gpointer data;
GDestroyNotify destroy;
};
static void g_thread_cleanup (gpointer data);
static void g_thread_fail (void);
/* Global variables */
gboolean g_thread_use_default_impl = TRUE;
gboolean g_threads_got_initialized = FALSE;
#if defined(NATIVE_WIN32) && defined(__GNUC__)
__declspec(dllexport)
#endif
GThreadFunctions g_thread_functions_for_glib_use = {
(GMutex*(*)())g_thread_fail, /* mutex_new */
NULL, /* mutex_lock */
NULL, /* mutex_trylock */
NULL, /* mutex_unlock */
NULL, /* mutex_free */
(GCond*(*)())g_thread_fail, /* cond_new */
NULL, /* cond_signal */
NULL, /* cond_broadcast */
NULL, /* cond_wait */
NULL, /* cond_timed_wait */
NULL, /* cond_free */
(GPrivate*(*)(GDestroyNotify))g_thread_fail, /* private_new */
NULL, /* private_get */
NULL, /* private_set */
(gpointer(*)(GThreadFunc, gpointer, gulong,
gboolean, gboolean,
GThreadPriority))g_thread_fail, /* thread_create */
NULL, /* thread_yield */
NULL, /* thread_join */
NULL, /* thread_exit */
NULL, /* thread_set_priority */
NULL /* thread_self */
};
/* Local data */
static GMutex *g_mutex_protect_static_mutex_allocation = NULL;
static GMutex *g_thread_specific_mutex = NULL;
static GPrivate *g_thread_specific_private = NULL;
/* This must be called only once, before any threads are created.
* It will only be called from g_thread_init() in -lgthread.
*/
void
g_mutex_init (void)
{
gpointer private_old;
/* We let the main thread (the one that calls g_thread_init) inherit
* the data, that it set before calling g_thread_init
*/
private_old = g_thread_specific_private;
g_thread_specific_private = g_private_new (g_thread_cleanup);
/* we can not use g_private_set here, as g_threads_got_initialized is not
* yet set TRUE, whereas the private_set function is already set.
*/
g_thread_functions_for_glib_use.private_set (g_thread_specific_private,
private_old);
g_mutex_protect_static_mutex_allocation = g_mutex_new();
g_thread_specific_mutex = g_mutex_new();
}
GMutex *
g_static_mutex_get_mutex_impl (GMutex** mutex)
{
if (!g_thread_supported ())
return NULL;
g_assert (g_mutex_protect_static_mutex_allocation);
g_mutex_lock (g_mutex_protect_static_mutex_allocation);
if (!(*mutex))
*mutex = g_mutex_new();
g_mutex_unlock (g_mutex_protect_static_mutex_allocation);
return *mutex;
}
#ifndef g_static_rec_mutex_lock
/* That means, that g_static_rec_mutex_lock is not defined to be
* g_static_mutex_lock, we have to provide an implementation ourselves.
*/
void
g_static_rec_mutex_lock (GStaticRecMutex* mutex)
{
guint counter = GPOINTER_TO_UINT (g_static_private_get (&mutex->counter));
if (counter == 0)
{
g_static_mutex_lock (&mutex->mutex);
}
counter++;
g_static_private_set (&mutex->counter, GUINT_TO_POINTER (counter), NULL);
}
gboolean
g_static_rec_mutex_trylock (GStaticRecMutex* mutex)
{
guint counter = GPOINTER_TO_UINT (g_static_private_get (&mutex->counter));
if (counter == 0)
{
if (!g_static_mutex_trylock (&mutex->mutex)) return FALSE;
}
counter++;
g_static_private_set (&mutex->counter, GUINT_TO_POINTER (counter), NULL);
return TRUE;
}
void
g_static_rec_mutex_unlock (GStaticRecMutex* mutex)
{
guint counter = GPOINTER_TO_UINT (g_static_private_get (&mutex->counter));
if (counter == 1)
{
g_static_mutex_unlock (&mutex->mutex);
}
counter--;
g_static_private_set (&mutex->counter, GUINT_TO_POINTER (counter), NULL);
}
#endif /* g_static_rec_mutex_lock */
gpointer
g_static_private_get (GStaticPrivate *private_key)
{
return g_static_private_get_for_thread (private_key, g_thread_self ());
}
gpointer
g_static_private_get_for_thread (GStaticPrivate *private_key,
GThread *thread)
{
GArray *array;
GRealThread *self = (GRealThread*) thread;
g_return_val_if_fail (thread, NULL);
array = self->private_data;
if (!array)
return NULL;
if (!private_key->index)
return NULL;
else if (private_key->index <= array->len)
return g_array_index (array, GStaticPrivateNode, private_key->index - 1).data;
else
return NULL;
}
void
g_static_private_set (GStaticPrivate *private_key,
gpointer data,
GDestroyNotify notify)
{
g_static_private_set_for_thread (private_key, g_thread_self (),
data, notify);
}
void
g_static_private_set_for_thread (GStaticPrivate *private_key,
GThread *thread,
gpointer data,
GDestroyNotify notify)
{
GArray *array;
GRealThread *self =(GRealThread*) thread;
static guint next_index = 0;
GStaticPrivateNode *node;
g_return_if_fail (thread);
array = self->private_data;
if (!array)
{
array = g_array_new (FALSE, TRUE, sizeof (GStaticPrivateNode));
self->private_data = array;
}
if (!private_key->index)
{
g_mutex_lock (g_thread_specific_mutex);
if (!private_key->index)
private_key->index = ++next_index;
g_mutex_unlock (g_thread_specific_mutex);
}
if (private_key->index > array->len)
g_array_set_size (array, private_key->index);
node = &g_array_index (array, GStaticPrivateNode, private_key->index - 1);
if (node->destroy)
{
gpointer ddata = node->data;
GDestroyNotify ddestroy = node->destroy;
node->data = data;
node->destroy = notify;
ddestroy (ddata);
}
else
{
node->data = data;
node->destroy = notify;
}
}
static void
g_thread_cleanup (gpointer data)
{
if (data)
{
GRealThread* thread = data;
if (thread->private_data)
{
GArray* array = thread->private_data;
guint i;
for (i = 0; i < array->len; i++ )
{
GStaticPrivateNode *node =
&g_array_index (array, GStaticPrivateNode, i);
if (node->destroy)
node->destroy (node->data);
}
g_array_free (array, TRUE);
}
/* We only free the thread structure, if it isn't joinable. If
it is, the structure is freed in g_thread_join */
if (!thread->thread.joinable)
{
/* Just to make sure, this isn't used any more */
thread->system_thread = NULL;
g_free (thread);
}
}
}
static void
g_thread_fail (void)
{
g_error ("The thread system is not yet initialized.");
}
G_LOCK_DEFINE_STATIC (g_thread_create);
static void
g_thread_create_proxy (gpointer data)
{
GRealThread* thread = data;
g_assert (data);
/* the lock makes sure, that thread->system_thread is written,
before thread->func is called. See g_thread_create */
G_LOCK (g_thread_create);
g_private_set (g_thread_specific_private, data);
G_UNLOCK (g_thread_create);
thread->func (thread->arg);
}
GThread*
g_thread_create (GThreadFunc thread_func,
gpointer arg,
gulong stack_size,
gboolean joinable,
gboolean bound,
GThreadPriority priority)
{
GRealThread* result = g_new0 (GRealThread,1);
g_return_val_if_fail (thread_func, NULL);
result->thread.joinable = joinable;
result->thread.bound = bound;
result->thread.priority = priority;
result->func = thread_func;
result->arg = arg;
G_LOCK (g_thread_create);
result->system_thread = G_THREAD_UF (thread_create, (g_thread_create_proxy,
result, stack_size,
joinable, bound,
priority));
G_UNLOCK (g_thread_create);
return (GThread*) result;
}
void
g_thread_join (GThread* thread)
{
GRealThread* real = (GRealThread*) thread;
g_return_if_fail (thread);
g_return_if_fail (thread->joinable);
g_return_if_fail (real->system_thread);
G_THREAD_UF (thread_join, (real->system_thread));
/* Just to make sure, this isn't used any more */
thread->joinable = 0;
real->system_thread = NULL;
/* the thread structure for non-joinable threads is freed upon
thread end. We free the memory here. This will leave loose end,
if a joinable thread is not joined. */
g_free (thread);
}
void
g_thread_set_priority (GThread* thread,
GThreadPriority priority)
{
GRealThread* real = (GRealThread*) thread;
g_return_if_fail (thread);
g_return_if_fail (real->system_thread);
thread->priority = priority;
G_THREAD_CF (thread_set_priority, (void)0, (real->system_thread, priority));
}
GThread*
g_thread_self()
{
GRealThread* thread = g_private_get (g_thread_specific_private);
if (!thread)
{
/* If no thread data is available, provide and set one. This
can happen for the main thread and for threads, that are not
created by glib. */
thread = g_new (GRealThread,1);
thread->thread.joinable = FALSE; /* This is a save guess */
thread->thread.bound = TRUE; /* This isn't important at all */
thread->thread.priority = G_THREAD_PRIORITY_NORMAL; /* This is
just a guess */
thread->func = NULL;
thread->arg = NULL;
thread->system_thread = NULL;
thread->private_data = NULL;
g_private_set (g_thread_specific_private, thread);
}
if (g_thread_supported () && !thread->system_thread)
{
thread->system_thread = g_thread_functions_for_glib_use.thread_self();
}
return (GThread*)thread;
}
static void inline g_static_rw_lock_wait (GCond** cond, GStaticMutex* mutex)
{
if (!*cond)
*cond = g_cond_new ();
g_cond_wait (*cond, g_static_mutex_get_mutex (mutex));
}
static void inline g_static_rw_lock_signal (GStaticRWLock* lock)
{
if (lock->want_to_write && lock->write_cond)
g_cond_signal (lock->write_cond);
else if (lock->read_cond)
g_cond_signal (lock->read_cond);
}
void g_static_rw_lock_reader_lock (GStaticRWLock* lock)
{
g_return_if_fail (lock);
if (!g_threads_got_initialized)
return;
g_static_mutex_lock (&lock->mutex);
while (lock->write || lock->want_to_write)
g_static_rw_lock_wait (&lock->read_cond, &lock->mutex);
lock->read_counter++;
g_static_mutex_unlock (&lock->mutex);
}
gboolean g_static_rw_lock_reader_trylock (GStaticRWLock* lock)
{
gboolean ret_val = FALSE;
g_return_val_if_fail (lock, FALSE);
if (!g_threads_got_initialized)
return TRUE;
g_static_mutex_lock (&lock->mutex);
if (!lock->write && !lock->want_to_write)
{
lock->read_counter++;
ret_val = TRUE;
}
g_static_mutex_unlock (&lock->mutex);
return ret_val;
}
void g_static_rw_lock_reader_unlock (GStaticRWLock* lock)
{
g_return_if_fail (lock);
if (!g_threads_got_initialized)
return;
g_static_mutex_lock (&lock->mutex);
lock->read_counter--;
g_static_rw_lock_signal (lock);
g_static_mutex_unlock (&lock->mutex);
}
void g_static_rw_lock_writer_lock (GStaticRWLock* lock)
{
g_return_if_fail (lock);
if (!g_threads_got_initialized)
return;
g_static_mutex_lock (&lock->mutex);
lock->want_to_write++;
while (lock->write || lock->read_counter)
g_static_rw_lock_wait (&lock->write_cond, &lock->mutex);
lock->want_to_write--;
lock->write = TRUE;
g_static_mutex_unlock (&lock->mutex);
}
gboolean g_static_rw_lock_writer_trylock (GStaticRWLock* lock)
{
gboolean ret_val = FALSE;
g_return_val_if_fail (lock, FALSE);
if (!g_threads_got_initialized)
return TRUE;
g_static_mutex_lock (&lock->mutex);
if (!lock->write && !lock->read_counter)
{
lock->write = TRUE;
ret_val = TRUE;
}
g_static_mutex_unlock (&lock->mutex);
return ret_val;
}
void g_static_rw_lock_writer_unlock (GStaticRWLock* lock)
{
g_return_if_fail (lock);
if (!g_threads_got_initialized)
return;
g_static_mutex_lock (&lock->mutex);
lock->write = FALSE;
g_static_rw_lock_signal (lock);
g_static_mutex_unlock (&lock->mutex);
}
void g_static_rw_lock_free (GStaticRWLock* lock)
{
g_return_if_fail (lock);
if (lock->read_cond)
g_cond_free (lock->read_cond);
if (lock->write_cond)
g_cond_free (lock->write_cond);
}