diff -r 000000000000 -r e4d67989cc36 glib/libglib/src/gthread.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/glib/libglib/src/gthread.c Tue Feb 02 02:01:42 2010 +0200 @@ -0,0 +1,1083 @@ +/* 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 + * Portions copyright (c) 2006 Nokia Corporation. All rights reserved. + * + * 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" + +#ifdef HAVE_UNISTD_H +#include +#endif + +#include + +#include "glib.h" +#include "gthreadinit.h" +#include "galias.h" + +#ifdef __SYMBIAN32__ +#include +#include "glibbackend.h" +#endif /* __SYMBIAN32__ */ + +#if GLIB_SIZEOF_SYSTEM_THREAD == SIZEOF_VOID_P +# define g_system_thread_equal_simple(thread1, thread2) \ + ((thread1).dummy_pointer == (thread2).dummy_pointer) +# define g_system_thread_assign(dest, src) \ + ((dest).dummy_pointer = (src).dummy_pointer) +#else /* GLIB_SIZEOF_SYSTEM_THREAD != SIZEOF_VOID_P */ +# define g_system_thread_equal_simple(thread1, thread2) \ + (memcmp (&(thread1), &(thread2), GLIB_SIZEOF_SYSTEM_THREAD) == 0) +# define g_system_thread_assign(dest, src) \ + (memcpy (&(dest), &(src), GLIB_SIZEOF_SYSTEM_THREAD)) +#endif /* GLIB_SIZEOF_SYSTEM_THREAD == SIZEOF_VOID_P */ + +#define g_system_thread_equal(thread1, thread2) \ + (g_thread_functions_for_glib_use.thread_equal ? \ + g_thread_functions_for_glib_use.thread_equal (&(thread1), &(thread2)) :\ + g_system_thread_equal_simple((thread1), (thread2))) + +#if EMULATOR + +PLS(quark,g_thread_error_quark ,GQuark) +#define quark (*FUNCTION_NAME(quark,g_thread_error_quark )()) + +#endif /* EMULATOR */ + +EXPORT_C GQuark +g_thread_error_quark (void) +{ + #if !(EMULATOR) + static GQuark quark; + #endif /* EMULATOR */ + if (!quark) + quark = g_quark_from_static_string ("g_thread_error"); + return quark; +} + +#if !(EMULATOR) +#undef quark +#endif /* EMULATOR */ + +/* Keep this in sync with GRealThread in gmain.c! */ +#if !(EMULATOR) +typedef struct _GRealThread GRealThread; +struct _GRealThread +{ + GThread thread; + gpointer private_data; + GRealThread *next; + gpointer retval; + GSystemThread system_thread; +}; +#endif /* !(EMULATOR) */ + +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 */ + + +#if EMULATOR + +PLS(zero_thread,gthread,GSystemThread) +#define zero_thread (*FUNCTION_NAME(zero_thread,gthread)()) + +#else + +static GSystemThread zero_thread; /* This is initialized to all zero */ + +#endif /* EMULATOR */ + +#if EMULATOR + +PLS(g_thread_use_default_impl,gthread,gboolean) +PLS(g_threads_got_initialized,gthread,gboolean) +PLS(g_thread_functions_for_glib_use,gthread,GThreadFunctions) + +#define g_thread_use_default_impl (*FUNCTION_NAME(g_thread_use_default_impl,gthread)()) +#define g_threads_got_initialized (*FUNCTION_NAME(g_threads_got_initialized,gthread)()) +#define g_thread_functions_for_glib_use (*FUNCTION_NAME(g_thread_functions_for_glib_use,gthread)()) + +const GThreadFunctions temp_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 */ +}; + +#else + +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 */ +}; +#endif + +#ifdef __SYMBIAN32__ +GArray* _g_array_newP (gboolean zero_terminated, + gboolean clear_, + guint element_size); +#endif // __SYMBIAN32__ + +#ifdef __SYMBIAN32__ +EXPORT_C gboolean *_g_thread_use_default_impl() +{ + return &g_thread_use_default_impl; +} + +EXPORT_C gboolean *_g_threads_got_initialized() +{ + return &g_threads_got_initialized; +} + +EXPORT_C GThreadFunctions *_g_thread_functions_for_glib_use() +{ + return &g_thread_functions_for_glib_use; +} + +EXPORT_C gboolean g_thread_supported () +{ + return g_threads_got_initialized; +} + +#endif /* __SYMBIAN32__ */ + + +/* Local data */ + +#if EMULATOR + +PLS(g_once_mutex,gthread,GMutex *) +PLS(g_once_cond,gthread,GCond *) +PLS(g_thread_specific_private ,gthread,GPrivate *) +PLS(g_thread_all_threads,gthread,GRealThread *) +PLS(g_thread_free_indeces,gthread,GSList *) +PLS_MACRO(g_thread,gthread,GStaticMutex) + +#define g_once_mutex (*FUNCTION_NAME(g_once_mutex,gthread)()) +#define g_once_cond (*FUNCTION_NAME(g_once_cond,gthread)()) +#define g_thread_specific_private (*FUNCTION_NAME(g_thread_specific_private ,gthread)()) +#define g_thread_all_threads (*FUNCTION_NAME(g_thread_all_threads,gthread)()) +#define g_thread_free_indeces (*FUNCTION_NAME(g_thread_free_indeces,gthread)()) +#define g__g_thread_lock (*FUNCTION_NAME_MACRO(g_thread,gthread)()) + +#else + +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; + +G_LOCK_DEFINE_STATIC (g_thread); + +#endif /* EMULATOR */ + +#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. + */ +EXPORT_C 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_convert_thread_init (); + _g_rand_thread_init (); + _g_main_thread_init (); + _g_atomic_thread_init (); + _g_utils_thread_init (); +#ifdef G_OS_WIN32 + _g_win32_thread_init (); +#endif +} +#endif /* G_THREADS_ENABLED */ + +EXPORT_C 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; +} + +EXPORT_C void +g_static_mutex_init (GStaticMutex *mutex) +{ + static const GStaticMutex init_mutex = G_STATIC_MUTEX_INIT; + + g_return_if_fail (mutex); + + *mutex = init_mutex; +} + +EXPORT_C 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)) + { + GMutex *new_mutex = g_mutex_new (); + + /* The following is a memory barrier to avoid the write + * to *new_mutex being reordered to after writing *mutex */ + g_mutex_lock (new_mutex); + g_mutex_unlock (new_mutex); + + *mutex = new_mutex; + } + + g_mutex_unlock (g_once_mutex); + + return *mutex; +} + +EXPORT_C 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 */ + runtime_mutex = ((GMutex**)mutex); + + if (*runtime_mutex) + g_mutex_free (*runtime_mutex); + + *runtime_mutex = NULL; +} + +EXPORT_C 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; +} + +EXPORT_C 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; +} + +EXPORT_C 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; +} + +EXPORT_C 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); +} + +EXPORT_C 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; +} + +EXPORT_C 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; +} + +EXPORT_C void +g_static_rec_mutex_free (GStaticRecMutex *mutex) +{ + g_return_if_fail (mutex); + + g_static_mutex_free (&mutex->mutex); +} + +EXPORT_C void +g_static_private_init (GStaticPrivate *private_key) +{ + private_key->index = 0; +} + +EXPORT_C 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; +} + +#if EMULATOR + +PLS(next_index ,g_static_private_set,guint) +#define next_index (*FUNCTION_NAME(next_index ,g_static_private_set)()) + +#endif /* EMULATOR */ + +EXPORT_C void +g_static_private_set (GStaticPrivate *private_key, + gpointer data, + GDestroyNotify notify) +{ + GRealThread *self = (GRealThread*) g_thread_self (); + GArray *array; + #if !(EMULATOR) + static guint next_index = 0; + #endif /* EMULATOR */ + + GStaticPrivateNode *node; + + array = self->private_data; + if (!array) + { +#ifndef __SYMBIAN32__ + array = g_array_new (FALSE, TRUE, sizeof (GStaticPrivateNode)); +#else + array = _g_array_newP (FALSE, TRUE, sizeof (GStaticPrivateNode)); +#endif // __SYMBIAN32__ + 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) +#ifndef __SYMBIAN32__ + g_array_set_size (array, private_key->index); +#else // __SYMBIAN32__ + _g_array_set_sizeP (array, private_key->index); +#endif // !__SYMBIAN32__ + + 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; + } +} + +#if EMULATOR +#undef next_index +#endif /* EMULATOR */ + +EXPORT_C void +g_static_private_free (GStaticPrivate *private_key) +{ + guint index = private_key->index; + GRealThread *thread; + + if (!index) + 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 && index <= array->len) + { + GStaticPrivateNode *node = &g_array_index (array, + GStaticPrivateNode, + index - 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 (index)); + 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); + } +#ifndef __SYMBIAN32__ + g_array_free (array, TRUE); +#else // __SYMBIAN32__ + _g_array_freeP(array,TRUE); +#endif // !__SYMBIAN32__ + } + + /* 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); +#ifndef __SYMBIAN32__ + g_free (thread); +#else // __SYMBIAN32__ + pFree(thread); +#endif // !__SYMBIAN32__ + } + } +} + +static void +g_thread_fail (void) +{ + g_error ("The thread system is not yet initialized."); +} + +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; +} + +EXPORT_C 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); +#ifndef __SYMBIAN32__ + result = g_new0 (GRealThread, 1); +#else // __SYMBIAN32__ + result = (GRealThread*)pAlloc(sizeof(GRealThread)); +#endif // !__SYMBIAN32__ + + + 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)); + 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; +} + +EXPORT_C void +g_thread_exit (gpointer retval) +{ + GRealThread* real = (GRealThread*) g_thread_self (); + real->retval = retval; + G_THREAD_CF (thread_exit, (void)0, ()); +} + +EXPORT_C 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. */ + +#ifndef __SYMBIAN32__ + g_free (thread); +#else // __SYMBIAN32__ + pFree(thread); +#endif // !__SYMBIAN32__ + + return retval; +} + +EXPORT_C 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)); +} + +EXPORT_C 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. */ +#ifndef __SYMBIAN32__ + thread = g_new0 (GRealThread, 1); +#else // __SYMBIAN32__ + thread = (GRealThread*)pAlloc(sizeof(GRealThread)); +#endif // !__SYMBIAN32__ + 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; +} + +EXPORT_C 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); +} + +EXPORT_C 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); +} + +EXPORT_C 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; +} + +EXPORT_C 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); +} + +EXPORT_C 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); +} + +EXPORT_C 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; +} + +EXPORT_C 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); +} + +EXPORT_C 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 + */ +EXPORT_C 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); + } +} + +#define __G_THREAD_C__ +#include "galiasdef.c"