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glib/glib/gthread.c
Matthias Clasen bd02a9f778 Fix docs 
svn path=/trunk/; revision=7933
2009-03-01 17:00:21 +00:00

994 lines
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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: 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 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
*/
/* implement gthread.h's inline functions */
#define G_IMPLEMENT_INLINES 1
#define __G_THREAD_C__
#include "config.h"
#include "glib.h"
#include "gthreadprivate.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifndef G_OS_WIN32
#include <sys/time.h>
#include <time.h>
#else
#include <windows.h>
#endif /* G_OS_WIN32 */
#include <string.h>
#include "galias.h"
GQuark
g_thread_error_quark (void)
{
return g_quark_from_static_string ("g_thread_error");
}
/* Keep this in sync with GRealThread in gmain.c! */
typedef struct _GRealThread GRealThread;
struct _GRealThread
{
GThread thread;
gpointer private_data;
GRealThread *next;
gpointer retval;
GSystemThread system_thread;
};
typedef struct _GStaticPrivateNode GStaticPrivateNode;
struct _GStaticPrivateNode
{
gpointer data;
GDestroyNotify destroy;
};
static void g_thread_cleanup (gpointer data);
static void g_thread_fail (void);
static guint64 gettime (void);
guint64 (*g_thread_gettime) (void) = gettime;
/* Global variables */
static GSystemThread zero_thread; /* This is initialized to all zero */
gboolean g_thread_use_default_impl = TRUE;
gboolean g_threads_got_initialized = FALSE;
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 */
(void(*)(GThreadFunc, gpointer, gulong,
gboolean, gboolean, GThreadPriority,
gpointer, GError**))g_thread_fail, /* thread_create */
NULL, /* thread_yield */
NULL, /* thread_join */
NULL, /* thread_exit */
NULL, /* thread_set_priority */
NULL, /* thread_self */
NULL /* thread_equal */
};
/* Local data */
static GMutex *g_once_mutex = NULL;
static GCond *g_once_cond = NULL;
static GPrivate *g_thread_specific_private = NULL;
static GRealThread *g_thread_all_threads = NULL;
static GSList *g_thread_free_indeces = NULL;
static GSList* g_once_init_list = NULL;
G_LOCK_DEFINE_STATIC (g_thread);
#ifdef G_THREADS_ENABLED
/* This must be called only once, before any threads are created.
* It will only be called from g_thread_init() in -lgthread.
*/
void
g_thread_init_glib (void)
{
/* We let the main thread (the one that calls g_thread_init) inherit
* the static_private data set before calling g_thread_init
*/
GRealThread* main_thread = (GRealThread*) g_thread_self ();
/* mutex and cond creation works without g_threads_got_initialized */
g_once_mutex = g_mutex_new ();
g_once_cond = g_cond_new ();
/* we may only create mutex and cond in here */
_g_mem_thread_init_noprivate_nomessage ();
/* setup the basic threading system */
g_threads_got_initialized = TRUE;
g_thread_specific_private = g_private_new (g_thread_cleanup);
g_private_set (g_thread_specific_private, main_thread);
G_THREAD_UF (thread_self, (&main_thread->system_thread));
/* complete memory system initialization, g_private_*() works now */
_g_slice_thread_init_nomessage ();
/* accomplish log system initialization to enable messaging */
_g_messages_thread_init_nomessage ();
/* we may run full-fledged initializers from here */
_g_atomic_thread_init ();
_g_convert_thread_init ();
_g_rand_thread_init ();
_g_main_thread_init ();
_g_utils_thread_init ();
#ifdef G_OS_WIN32
_g_win32_thread_init ();
#endif
}
#endif /* G_THREADS_ENABLED */
gpointer
g_once_impl (GOnce *once,
GThreadFunc func,
gpointer arg)
{
g_mutex_lock (g_once_mutex);
while (once->status == G_ONCE_STATUS_PROGRESS)
g_cond_wait (g_once_cond, g_once_mutex);
if (once->status != G_ONCE_STATUS_READY)
{
once->status = G_ONCE_STATUS_PROGRESS;
g_mutex_unlock (g_once_mutex);
once->retval = func (arg);
g_mutex_lock (g_once_mutex);
once->status = G_ONCE_STATUS_READY;
g_cond_broadcast (g_once_cond);
}
g_mutex_unlock (g_once_mutex);
return once->retval;
}
gboolean
g_once_init_enter_impl (volatile gsize *value_location)
{
gboolean need_init = FALSE;
g_mutex_lock (g_once_mutex);
if (g_atomic_pointer_get (value_location) == NULL)
{
if (!g_slist_find (g_once_init_list, (void*) value_location))
{
need_init = TRUE;
g_once_init_list = g_slist_prepend (g_once_init_list, (void*) value_location);
}
else
do
g_cond_wait (g_once_cond, g_once_mutex);
while (g_slist_find (g_once_init_list, (void*) value_location));
}
g_mutex_unlock (g_once_mutex);
return need_init;
}
void
g_once_init_leave (volatile gsize *value_location,
gsize initialization_value)
{
g_return_if_fail (g_atomic_pointer_get (value_location) == NULL);
g_return_if_fail (initialization_value != 0);
g_return_if_fail (g_once_init_list != NULL);
g_atomic_pointer_set ((void**)value_location, (void*) initialization_value);
g_mutex_lock (g_once_mutex);
g_once_init_list = g_slist_remove (g_once_init_list, (void*) value_location);
g_cond_broadcast (g_once_cond);
g_mutex_unlock (g_once_mutex);
}
void
g_static_mutex_init (GStaticMutex *mutex)
{
static const GStaticMutex init_mutex = G_STATIC_MUTEX_INIT;
g_return_if_fail (mutex);
*mutex = init_mutex;
}
GMutex *
g_static_mutex_get_mutex_impl (GMutex** mutex)
{
if (!g_thread_supported ())
return NULL;
g_assert (g_once_mutex);
g_mutex_lock (g_once_mutex);
if (!(*mutex))
g_atomic_pointer_set (mutex, g_mutex_new());
g_mutex_unlock (g_once_mutex);
return *mutex;
}
void
g_static_mutex_free (GStaticMutex* mutex)
{
GMutex **runtime_mutex;
g_return_if_fail (mutex);
/* The runtime_mutex is the first (or only) member of GStaticMutex,
* see both versions (of glibconfig.h) in configure.in. Note, that
* this variable is NULL, if g_thread_init() hasn't been called or
* if we're using the default thread implementation and it provides
* static mutexes. */
runtime_mutex = ((GMutex**)mutex);
if (*runtime_mutex)
g_mutex_free (*runtime_mutex);
*runtime_mutex = NULL;
}
void
g_static_rec_mutex_init (GStaticRecMutex *mutex)
{
static const GStaticRecMutex init_mutex = G_STATIC_REC_MUTEX_INIT;
g_return_if_fail (mutex);
*mutex = init_mutex;
}
void
g_static_rec_mutex_lock (GStaticRecMutex* mutex)
{
GSystemThread self;
g_return_if_fail (mutex);
if (!g_thread_supported ())
return;
G_THREAD_UF (thread_self, (&self));
if (g_system_thread_equal (self, mutex->owner))
{
mutex->depth++;
return;
}
g_static_mutex_lock (&mutex->mutex);
g_system_thread_assign (mutex->owner, self);
mutex->depth = 1;
}
gboolean
g_static_rec_mutex_trylock (GStaticRecMutex* mutex)
{
GSystemThread self;
g_return_val_if_fail (mutex, FALSE);
if (!g_thread_supported ())
return TRUE;
G_THREAD_UF (thread_self, (&self));
if (g_system_thread_equal (self, mutex->owner))
{
mutex->depth++;
return TRUE;
}
if (!g_static_mutex_trylock (&mutex->mutex))
return FALSE;
g_system_thread_assign (mutex->owner, self);
mutex->depth = 1;
return TRUE;
}
void
g_static_rec_mutex_unlock (GStaticRecMutex* mutex)
{
g_return_if_fail (mutex);
if (!g_thread_supported ())
return;
if (mutex->depth > 1)
{
mutex->depth--;
return;
}
g_system_thread_assign (mutex->owner, zero_thread);
g_static_mutex_unlock (&mutex->mutex);
}
void
g_static_rec_mutex_lock_full (GStaticRecMutex *mutex,
guint depth)
{
GSystemThread self;
g_return_if_fail (mutex);
if (!g_thread_supported ())
return;
if (depth == 0)
return;
G_THREAD_UF (thread_self, (&self));
if (g_system_thread_equal (self, mutex->owner))
{
mutex->depth += depth;
return;
}
g_static_mutex_lock (&mutex->mutex);
g_system_thread_assign (mutex->owner, self);
mutex->depth = depth;
}
guint
g_static_rec_mutex_unlock_full (GStaticRecMutex *mutex)
{
guint depth;
g_return_val_if_fail (mutex, 0);
if (!g_thread_supported ())
return 1;
depth = mutex->depth;
g_system_thread_assign (mutex->owner, zero_thread);
mutex->depth = 0;
g_static_mutex_unlock (&mutex->mutex);
return depth;
}
void
g_static_rec_mutex_free (GStaticRecMutex *mutex)
{
g_return_if_fail (mutex);
g_static_mutex_free (&mutex->mutex);
}
void
g_static_private_init (GStaticPrivate *private_key)
{
private_key->index = 0;
}
gpointer
g_static_private_get (GStaticPrivate *private_key)
{
GRealThread *self = (GRealThread*) g_thread_self ();
GArray *array;
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)
{
GRealThread *self = (GRealThread*) g_thread_self ();
GArray *array;
static guint next_index = 0;
GStaticPrivateNode *node;
array = self->private_data;
if (!array)
{
array = g_array_new (FALSE, TRUE, sizeof (GStaticPrivateNode));
self->private_data = array;
}
if (!private_key->index)
{
G_LOCK (g_thread);
if (!private_key->index)
{
if (g_thread_free_indeces)
{
private_key->index =
GPOINTER_TO_UINT (g_thread_free_indeces->data);
g_thread_free_indeces =
g_slist_delete_link (g_thread_free_indeces,
g_thread_free_indeces);
}
else
private_key->index = ++next_index;
}
G_UNLOCK (g_thread);
}
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;
}
}
void
g_static_private_free (GStaticPrivate *private_key)
{
guint idx = private_key->index;
GRealThread *thread;
if (!idx)
return;
private_key->index = 0;
G_LOCK (g_thread);
thread = g_thread_all_threads;
while (thread)
{
GArray *array = thread->private_data;
thread = thread->next;
if (array && idx <= array->len)
{
GStaticPrivateNode *node = &g_array_index (array,
GStaticPrivateNode,
idx - 1);
gpointer ddata = node->data;
GDestroyNotify ddestroy = node->destroy;
node->data = NULL;
node->destroy = NULL;
if (ddestroy)
{
G_UNLOCK (g_thread);
ddestroy (ddata);
G_LOCK (g_thread);
}
}
}
g_thread_free_indeces = g_slist_prepend (g_thread_free_indeces,
GUINT_TO_POINTER (idx));
G_UNLOCK (g_thread);
}
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)
{
GRealThread *t, *p;
G_LOCK (g_thread);
for (t = g_thread_all_threads, p = NULL; t; p = t, t = t->next)
{
if (t == thread)
{
if (p)
p->next = t->next;
else
g_thread_all_threads = t->next;
break;
}
}
G_UNLOCK (g_thread);
/* Just to make sure, this isn't used any more */
g_system_thread_assign (thread->system_thread, zero_thread);
g_free (thread);
}
}
}
static void
g_thread_fail (void)
{
g_error ("The thread system is not yet initialized.");
}
#define G_NSEC_PER_SEC 1000000000
static guint64
gettime (void)
{
#ifdef G_OS_WIN32
guint64 v;
/* Returns 100s of nanoseconds since start of 1601 */
GetSystemTimeAsFileTime ((FILETIME *)&v);
/* Offset to Unix epoch */
v -= G_GINT64_CONSTANT (116444736000000000);
/* Convert to nanoseconds */
v *= 100;
return v;
#else
struct timeval tv;
gettimeofday (&tv, NULL);
return (guint64) tv.tv_sec * G_NSEC_PER_SEC + tv.tv_usec * (G_NSEC_PER_SEC / G_USEC_PER_SEC);
#endif
}
static gpointer
g_thread_create_proxy (gpointer data)
{
GRealThread* thread = data;
g_assert (data);
/* This has to happen before G_LOCK, as that might call g_thread_self */
g_private_set (g_thread_specific_private, data);
/* the lock makes sure, that thread->system_thread is written,
before thread->thread.func is called. See g_thread_create. */
G_LOCK (g_thread);
G_UNLOCK (g_thread);
thread->retval = thread->thread.func (thread->thread.data);
return NULL;
}
GThread*
g_thread_create_full (GThreadFunc func,
gpointer data,
gulong stack_size,
gboolean joinable,
gboolean bound,
GThreadPriority priority,
GError **error)
{
GRealThread* result;
GError *local_error = NULL;
g_return_val_if_fail (func, NULL);
g_return_val_if_fail (priority >= G_THREAD_PRIORITY_LOW, NULL);
g_return_val_if_fail (priority <= G_THREAD_PRIORITY_URGENT, NULL);
result = g_new0 (GRealThread, 1);
result->thread.joinable = joinable;
result->thread.priority = priority;
result->thread.func = func;
result->thread.data = data;
result->private_data = NULL;
G_LOCK (g_thread);
G_THREAD_UF (thread_create, (g_thread_create_proxy, result,
stack_size, joinable, bound, priority,
&result->system_thread, &local_error));
if (!local_error)
{
result->next = g_thread_all_threads;
g_thread_all_threads = result;
}
G_UNLOCK (g_thread);
if (local_error)
{
g_propagate_error (error, local_error);
g_free (result);
return NULL;
}
return (GThread*) result;
}
void
g_thread_exit (gpointer retval)
{
GRealThread* real = (GRealThread*) g_thread_self ();
real->retval = retval;
G_THREAD_CF (thread_exit, (void)0, ());
}
gpointer
g_thread_join (GThread* thread)
{
GRealThread* real = (GRealThread*) thread;
GRealThread *p, *t;
gpointer retval;
g_return_val_if_fail (thread, NULL);
g_return_val_if_fail (thread->joinable, NULL);
g_return_val_if_fail (!g_system_thread_equal (real->system_thread,
zero_thread), NULL);
G_THREAD_UF (thread_join, (&real->system_thread));
retval = real->retval;
G_LOCK (g_thread);
for (t = g_thread_all_threads, p = NULL; t; p = t, t = t->next)
{
if (t == (GRealThread*) thread)
{
if (p)
p->next = t->next;
else
g_thread_all_threads = t->next;
break;
}
}
G_UNLOCK (g_thread);
/* Just to make sure, this isn't used any more */
thread->joinable = 0;
g_system_thread_assign (real->system_thread, zero_thread);
/* the thread structure for non-joinable threads is freed upon
thread end. We free the memory here. This will leave a loose end,
if a joinable thread is not joined. */
g_free (thread);
return retval;
}
void
g_thread_set_priority (GThread* thread,
GThreadPriority priority)
{
GRealThread* real = (GRealThread*) thread;
g_return_if_fail (thread);
g_return_if_fail (!g_system_thread_equal (real->system_thread, zero_thread));
g_return_if_fail (priority >= G_THREAD_PRIORITY_LOW);
g_return_if_fail (priority <= G_THREAD_PRIORITY_URGENT);
thread->priority = priority;
G_THREAD_CF (thread_set_priority, (void)0,
(&real->system_thread, priority));
}
GThread*
g_thread_self (void)
{
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_new0 (GRealThread, 1);
thread->thread.joinable = FALSE; /* This is a save guess */
thread->thread.priority = G_THREAD_PRIORITY_NORMAL; /* This is
just a guess */
thread->thread.func = NULL;
thread->thread.data = NULL;
thread->private_data = NULL;
if (g_thread_supported ())
G_THREAD_UF (thread_self, (&thread->system_thread));
g_private_set (g_thread_specific_private, thread);
G_LOCK (g_thread);
thread->next = g_thread_all_threads;
g_thread_all_threads = thread;
G_UNLOCK (g_thread);
}
return (GThread*)thread;
}
void
g_static_rw_lock_init (GStaticRWLock* lock)
{
static const GStaticRWLock init_lock = G_STATIC_RW_LOCK_INIT;
g_return_if_fail (lock);
*lock = init_lock;
}
inline static void
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));
}
inline static void
g_static_rw_lock_signal (GStaticRWLock* lock)
{
if (lock->want_to_write && lock->write_cond)
g_cond_signal (lock->write_cond);
else if (lock->want_to_read && lock->read_cond)
g_cond_broadcast (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);
lock->want_to_read++;
while (lock->have_writer || lock->want_to_write)
g_static_rw_lock_wait (&lock->read_cond, &lock->mutex);
lock->want_to_read--;
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->have_writer && !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--;
if (lock->read_counter == 0)
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->have_writer || lock->read_counter)
g_static_rw_lock_wait (&lock->write_cond, &lock->mutex);
lock->want_to_write--;
lock->have_writer = 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->have_writer && !lock->read_counter)
{
lock->have_writer = 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->have_writer = 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);
lock->read_cond = NULL;
}
if (lock->write_cond)
{
g_cond_free (lock->write_cond);
lock->write_cond = NULL;
}
g_static_mutex_free (&lock->mutex);
}
/**
* g_thread_foreach
* @thread_func: function to call for all GThread structures
* @user_data: second argument to @thread_func
*
* Call @thread_func on all existing #GThread structures. Note that
* threads may decide to exit while @thread_func is running, so
* without intimate knowledge about the lifetime of foreign threads,
* @thread_func shouldn't access the GThread* pointer passed in as
* first argument. However, @thread_func will not be called for threads
* which are known to have exited already.
*
* Due to thread lifetime checks, this function has an execution complexity
* which is quadratic in the number of existing threads.
*
* Since: 2.10
*/
void
g_thread_foreach (GFunc thread_func,
gpointer user_data)
{
GSList *slist = NULL;
GRealThread *thread;
g_return_if_fail (thread_func != NULL);
/* snapshot the list of threads for iteration */
G_LOCK (g_thread);
for (thread = g_thread_all_threads; thread; thread = thread->next)
slist = g_slist_prepend (slist, thread);
G_UNLOCK (g_thread);
/* walk the list, skipping non-existant threads */
while (slist)
{
GSList *node = slist;
slist = node->next;
/* check whether the current thread still exists */
G_LOCK (g_thread);
for (thread = g_thread_all_threads; thread; thread = thread->next)
if (thread == node->data)
break;
G_UNLOCK (g_thread);
if (thread)
thread_func (thread, user_data);
g_slist_free_1 (node);
}
}
/**
* g_thread_get_initialized
*
* Indicates if g_thread_init() has been called.
*
* Returns: %TRUE if threads have been initialized.
*
* Since: 2.20
*/
gboolean
g_thread_get_initialized ()
{
return g_thread_supported ();
}
#define __G_THREAD_C__
#include "galiasdef.c"
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