| /* 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 2.1 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, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include "config.h" |
| |
| /* we know we are deprecated here, no need for warnings */ |
| #ifndef GLIB_DISABLE_DEPRECATION_WARNINGS |
| #define GLIB_DISABLE_DEPRECATION_WARNINGS |
| #endif |
| |
| #include "gmessages.h" |
| #include "gslice.h" |
| #include "gmain.h" |
| #include "gthread.h" |
| #include "gthreadprivate.h" |
| #include "deprecated/gthread.h" |
| #include "garray.h" |
| |
| #include "gutils.h" |
| |
| /* {{{1 Documentation */ |
| |
| /** |
| * SECTION:threads-deprecated |
| * @title: Deprecated thread API |
| * @short_description: old thread APIs (for reference only) |
| * @see_also: #GThread |
| * |
| * These APIs are deprecated. You should not use them in new code. |
| * This section remains only to assist with understanding code that was |
| * written to use these APIs at some point in the past. |
| **/ |
| |
| /** |
| * GThreadPriority: |
| * @G_THREAD_PRIORITY_LOW: a priority lower than normal |
| * @G_THREAD_PRIORITY_NORMAL: the default priority |
| * @G_THREAD_PRIORITY_HIGH: a priority higher than normal |
| * @G_THREAD_PRIORITY_URGENT: the highest priority |
| * |
| * Thread priorities. |
| * |
| * Deprecated:2.32: Thread priorities no longer have any effect. |
| */ |
| |
| /** |
| * GThreadFunctions: |
| * @mutex_new: virtual function pointer for g_mutex_new() |
| * @mutex_lock: virtual function pointer for g_mutex_lock() |
| * @mutex_trylock: virtual function pointer for g_mutex_trylock() |
| * @mutex_unlock: virtual function pointer for g_mutex_unlock() |
| * @mutex_free: virtual function pointer for g_mutex_free() |
| * @cond_new: virtual function pointer for g_cond_new() |
| * @cond_signal: virtual function pointer for g_cond_signal() |
| * @cond_broadcast: virtual function pointer for g_cond_broadcast() |
| * @cond_wait: virtual function pointer for g_cond_wait() |
| * @cond_timed_wait: virtual function pointer for g_cond_timed_wait() |
| * @cond_free: virtual function pointer for g_cond_free() |
| * @private_new: virtual function pointer for g_private_new() |
| * @private_get: virtual function pointer for g_private_get() |
| * @private_set: virtual function pointer for g_private_set() |
| * @thread_create: virtual function pointer for g_thread_create() |
| * @thread_yield: virtual function pointer for g_thread_yield() |
| * @thread_join: virtual function pointer for g_thread_join() |
| * @thread_exit: virtual function pointer for g_thread_exit() |
| * @thread_set_priority: virtual function pointer for |
| * g_thread_set_priority() |
| * @thread_self: virtual function pointer for g_thread_self() |
| * @thread_equal: used internally by recursive mutex locks and by some |
| * assertion checks |
| * |
| * This function table is no longer used by g_thread_init() |
| * to initialize the thread system. |
| */ |
| |
| /** |
| * G_THREADS_IMPL_POSIX: |
| * |
| * This macro is defined if POSIX style threads are used. |
| * |
| * Deprecated:2.32:POSIX threads are in use on all non-Windows systems. |
| * Use G_OS_WIN32 to detect Windows. |
| */ |
| |
| /** |
| * G_THREADS_IMPL_WIN32: |
| * |
| * This macro is defined if Windows style threads are used. |
| * |
| * Deprecated:2.32:Use G_OS_WIN32 to detect Windows. |
| */ |
| |
| |
| /* {{{1 Exported Variables */ |
| |
| /* Set this FALSE to have previously-compiled GStaticMutex code use the |
| * slow path (ie: call into us) to avoid compatibility problems. |
| */ |
| gboolean g_thread_use_default_impl = FALSE; |
| |
| GThreadFunctions g_thread_functions_for_glib_use = |
| { |
| g_mutex_new, |
| g_mutex_lock, |
| g_mutex_trylock, |
| g_mutex_unlock, |
| g_mutex_free, |
| g_cond_new, |
| g_cond_signal, |
| g_cond_broadcast, |
| g_cond_wait, |
| g_cond_timed_wait, |
| g_cond_free, |
| g_private_new, |
| g_private_get, |
| g_private_set, |
| NULL, |
| g_thread_yield, |
| NULL, |
| NULL, |
| NULL, |
| NULL, |
| NULL, |
| }; |
| |
| static guint64 |
| gettime (void) |
| { |
| return g_get_monotonic_time () * 1000; |
| } |
| |
| guint64 (*g_thread_gettime) (void) = gettime; |
| |
| /* Initialisation {{{1 ---------------------------------------------------- */ |
| gboolean g_threads_got_initialized = TRUE; |
| |
| /** |
| * g_thread_init: |
| * @vtable: a function table of type #GThreadFunctions, that provides |
| * the entry points to the thread system to be used. Since 2.32, |
| * this parameter is ignored and should always be %NULL |
| * |
| * If you use GLib from more than one thread, you must initialize the |
| * thread system by calling g_thread_init(). |
| * |
| * Since version 2.24, calling g_thread_init() multiple times is allowed, |
| * but nothing happens except for the first call. |
| * |
| * Since version 2.32, GLib does not support custom thread implementations |
| * anymore and the @vtable parameter is ignored and you should pass %NULL. |
| * |
| * <note><para>g_thread_init() must not be called directly or indirectly |
| * in a callback from GLib. Also no mutexes may be currently locked while |
| * calling g_thread_init().</para></note> |
| * |
| * <note><para>To use g_thread_init() in your program, you have to link |
| * with the libraries that the command <command>pkg-config --libs |
| * gthread-2.0</command> outputs. This is not the case for all the |
| * other thread-related functions of GLib. Those can be used without |
| * having to link with the thread libraries.</para></note> |
| * |
| * Deprecated:2.32: This function is no longer necessary. The GLib |
| * threading system is automatically initialized at the start |
| * of your program. |
| */ |
| |
| /** |
| * 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 (void) |
| { |
| return g_thread_supported (); |
| } |
| |
| /* We need this for ABI compatibility */ |
| GLIB_AVAILABLE_IN_ALL |
| void g_thread_init_glib (void); |
| void g_thread_init_glib (void) { } |
| |
| /* Internal variables {{{1 */ |
| |
| static GSList *g_thread_all_threads = NULL; |
| static GSList *g_thread_free_indices = NULL; |
| |
| /* Protects g_thread_all_threads and g_thread_free_indices */ |
| G_LOCK_DEFINE_STATIC (g_static_mutex); |
| G_LOCK_DEFINE_STATIC (g_thread); |
| |
| /* Misc. GThread functions {{{1 */ |
| |
| /** |
| * g_thread_set_priority: |
| * @thread: a #GThread. |
| * @priority: ignored |
| * |
| * This function does nothing. |
| * |
| * Deprecated:2.32: Thread priorities no longer have any effect. |
| */ |
| void |
| g_thread_set_priority (GThread *thread, |
| GThreadPriority priority) |
| { |
| } |
| |
| /** |
| * g_thread_foreach: |
| * @thread_func: function to call for all #GThread structures |
| * @user_data: second argument to @thread_func |
| * |
| * Call @thread_func on all #GThreads that have been |
| * created with g_thread_create(). |
| * |
| * 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 |
| * |
| * Deprecated:2.32: There aren't many things you can do with a #GThread, |
| * except comparing it with one that was returned from g_thread_create(). |
| * There are better ways to find out if your thread is still alive. |
| */ |
| 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); |
| slist = g_slist_copy (g_thread_all_threads); |
| G_UNLOCK (g_thread); |
| /* walk the list, skipping non-existent threads */ |
| while (slist) |
| { |
| GSList *node = slist; |
| slist = node->next; |
| /* check whether the current thread still exists */ |
| G_LOCK (g_thread); |
| if (g_slist_find (g_thread_all_threads, node->data)) |
| thread = node->data; |
| else |
| thread = NULL; |
| G_UNLOCK (g_thread); |
| if (thread) |
| thread_func (thread, user_data); |
| g_slist_free_1 (node); |
| } |
| } |
| |
| static void |
| g_enumerable_thread_remove (gpointer data) |
| { |
| GRealThread *thread = data; |
| |
| G_LOCK (g_thread); |
| g_thread_all_threads = g_slist_remove (g_thread_all_threads, thread); |
| G_UNLOCK (g_thread); |
| } |
| |
| GPrivate enumerable_thread_private = G_PRIVATE_INIT (g_enumerable_thread_remove); |
| |
| static void |
| g_enumerable_thread_add (GRealThread *thread) |
| { |
| G_LOCK (g_thread); |
| g_thread_all_threads = g_slist_prepend (g_thread_all_threads, thread); |
| G_UNLOCK (g_thread); |
| |
| g_private_set (&enumerable_thread_private, thread); |
| } |
| |
| static gpointer |
| g_deprecated_thread_proxy (gpointer data) |
| { |
| GRealThread *real = data; |
| |
| g_enumerable_thread_add (real); |
| |
| return g_thread_proxy (data); |
| } |
| |
| /** |
| * g_thread_create: |
| * @func: a function to execute in the new thread |
| * @data: an argument to supply to the new thread |
| * @joinable: should this thread be joinable? |
| * @error: return location for error, or %NULL |
| * |
| * This function creates a new thread. |
| * |
| * The new thread executes the function @func with the argument @data. |
| * If the thread was created successfully, it is returned. |
| * |
| * @error can be %NULL to ignore errors, or non-%NULL to report errors. |
| * The error is set, if and only if the function returns %NULL. |
| * |
| * This function returns a reference to the created thread only if |
| * @joinable is %TRUE. In that case, you must free this reference by |
| * calling g_thread_unref() or g_thread_join(). If @joinable is %FALSE |
| * then you should probably not touch the return value. |
| * |
| * Returns: the new #GThread on success |
| * |
| * Deprecated:2.32: Use g_thread_new() instead |
| */ |
| GThread * |
| g_thread_create (GThreadFunc func, |
| gpointer data, |
| gboolean joinable, |
| GError **error) |
| { |
| return g_thread_create_full (func, data, 0, joinable, 0, 0, error); |
| } |
| |
| /** |
| * g_thread_create_full: |
| * @func: a function to execute in the new thread. |
| * @data: an argument to supply to the new thread. |
| * @stack_size: a stack size for the new thread. |
| * @joinable: should this thread be joinable? |
| * @bound: ignored |
| * @priority: ignored |
| * @error: return location for error. |
| * |
| * This function creates a new thread. |
| * |
| * Returns: the new #GThread on success. |
| * |
| * Deprecated:2.32: The @bound and @priority arguments are now ignored. |
| * Use g_thread_new(). |
| */ |
| GThread * |
| g_thread_create_full (GThreadFunc func, |
| gpointer data, |
| gulong stack_size, |
| gboolean joinable, |
| gboolean bound, |
| GThreadPriority priority, |
| GError **error) |
| { |
| GThread *thread; |
| |
| thread = g_thread_new_internal (NULL, g_deprecated_thread_proxy, |
| func, data, stack_size, NULL, error); |
| |
| if (thread && !joinable) |
| { |
| thread->joinable = FALSE; |
| g_thread_unref (thread); |
| } |
| |
| return thread; |
| } |
| |
| /* GOnce {{{1 ------------------------------------------------------------- */ |
| gboolean |
| g_once_init_enter_impl (volatile gsize *location) |
| { |
| return (g_once_init_enter) (location); |
| } |
| |
| /* GStaticMutex {{{1 ------------------------------------------------------ */ |
| |
| /** |
| * GStaticMutex: |
| * |
| * A #GStaticMutex works like a #GMutex. |
| * |
| * Prior to GLib 2.32, GStaticMutex had the significant advantage |
| * that it doesn't need to be created at run-time, but can be defined |
| * at compile-time. Since 2.32, #GMutex can be statically allocated |
| * as well, and GStaticMutex has been deprecated. |
| * |
| * Here is a version of our give_me_next_number() example using |
| * a GStaticMutex: |
| * |[ |
| * int |
| * give_me_next_number (void) |
| * { |
| * static int current_number = 0; |
| * int ret_val; |
| * static GStaticMutex mutex = G_STATIC_MUTEX_INIT; |
| * |
| * g_static_mutex_lock (&mutex); |
| * ret_val = current_number = calc_next_number (current_number); |
| * g_static_mutex_unlock (&mutex); |
| * |
| * return ret_val; |
| * } |
| * ]| |
| * |
| * Sometimes you would like to dynamically create a mutex. If you don't |
| * want to require prior calling to g_thread_init(), because your code |
| * should also be usable in non-threaded programs, you are not able to |
| * use g_mutex_new() and thus #GMutex, as that requires a prior call to |
| * g_thread_init(). In these cases you can also use a #GStaticMutex. |
| * It must be initialized with g_static_mutex_init() before using it |
| * and freed with with g_static_mutex_free() when not needed anymore to |
| * free up any allocated resources. |
| * |
| * Even though #GStaticMutex is not opaque, it should only be used with |
| * the following functions, as it is defined differently on different |
| * platforms. |
| * |
| * All of the g_static_mutex_* functions apart from |
| * g_static_mutex_get_mutex() can also be used even if g_thread_init() |
| * has not yet been called. Then they do nothing, apart from |
| * g_static_mutex_trylock() which does nothing but returning %TRUE. |
| * |
| * All of the g_static_mutex_* functions are actually macros. Apart from |
| * taking their addresses, you can however use them as if they were |
| * functions. |
| */ |
| |
| /** |
| * G_STATIC_MUTEX_INIT: |
| * |
| * A #GStaticMutex must be initialized with this macro, before it can |
| * be used. This macro can used be to initialize a variable, but it |
| * cannot be assigned to a variable. In that case you have to use |
| * g_static_mutex_init(). |
| * |
| * |[ |
| * GStaticMutex my_mutex = G_STATIC_MUTEX_INIT; |
| * ]| |
| **/ |
| |
| /** |
| * g_static_mutex_init: |
| * @mutex: a #GStaticMutex to be initialized. |
| * |
| * Initializes @mutex. |
| * Alternatively you can initialize it with #G_STATIC_MUTEX_INIT. |
| * |
| * Deprecated: 2.32: Use g_mutex_init() |
| */ |
| void |
| g_static_mutex_init (GStaticMutex *mutex) |
| { |
| static const GStaticMutex init_mutex = G_STATIC_MUTEX_INIT; |
| |
| g_return_if_fail (mutex); |
| |
| *mutex = init_mutex; |
| } |
| |
| /* IMPLEMENTATION NOTE: |
| * |
| * On some platforms a GStaticMutex is actually a normal GMutex stored |
| * inside of a structure instead of being allocated dynamically. We can |
| * only do this for platforms on which we know, in advance, how to |
| * allocate (size) and initialise (value) that memory. |
| * |
| * On other platforms, a GStaticMutex is nothing more than a pointer to |
| * a GMutex. In that case, the first access we make to the static mutex |
| * must first allocate the normal GMutex and store it into the pointer. |
| * |
| * configure.ac writes macros into glibconfig.h to determine if |
| * g_static_mutex_get_mutex() accesses the structure in memory directly |
| * (on platforms where we are able to do that) or if it ends up here, |
| * where we may have to allocate the GMutex before returning it. |
| */ |
| |
| /** |
| * g_static_mutex_get_mutex: |
| * @mutex: a #GStaticMutex. |
| * |
| * For some operations (like g_cond_wait()) you must have a #GMutex |
| * instead of a #GStaticMutex. This function will return the |
| * corresponding #GMutex for @mutex. |
| * |
| * Returns: the #GMutex corresponding to @mutex. |
| * |
| * Deprecated: 2.32: Just use a #GMutex |
| */ |
| GMutex * |
| g_static_mutex_get_mutex_impl (GStaticMutex* mutex) |
| { |
| GMutex *result; |
| |
| if (!g_thread_supported ()) |
| return NULL; |
| |
| result = g_atomic_pointer_get (&mutex->mutex); |
| |
| if (!result) |
| { |
| G_LOCK (g_static_mutex); |
| |
| result = mutex->mutex; |
| if (!result) |
| { |
| result = g_mutex_new (); |
| g_atomic_pointer_set (&mutex->mutex, result); |
| } |
| |
| G_UNLOCK (g_static_mutex); |
| } |
| |
| return result; |
| } |
| |
| /* IMPLEMENTATION NOTE: |
| * |
| * g_static_mutex_lock(), g_static_mutex_trylock() and |
| * g_static_mutex_unlock() are all preprocessor macros that wrap the |
| * corresponding g_mutex_*() function around a call to |
| * g_static_mutex_get_mutex(). |
| */ |
| |
| /** |
| * g_static_mutex_lock: |
| * @mutex: a #GStaticMutex. |
| * |
| * Works like g_mutex_lock(), but for a #GStaticMutex. |
| * |
| * Deprecated: 2.32: Use g_mutex_lock() |
| */ |
| |
| /** |
| * g_static_mutex_trylock: |
| * @mutex: a #GStaticMutex. |
| * |
| * Works like g_mutex_trylock(), but for a #GStaticMutex. |
| * |
| * Returns: %TRUE, if the #GStaticMutex could be locked. |
| * |
| * Deprecated: 2.32: Use g_mutex_trylock() |
| */ |
| |
| /** |
| * g_static_mutex_unlock: |
| * @mutex: a #GStaticMutex. |
| * |
| * Works like g_mutex_unlock(), but for a #GStaticMutex. |
| * |
| * Deprecated: 2.32: Use g_mutex_unlock() |
| */ |
| |
| /** |
| * g_static_mutex_free: |
| * @mutex: a #GStaticMutex to be freed. |
| * |
| * Releases all resources allocated to @mutex. |
| * |
| * You don't have to call this functions for a #GStaticMutex with an |
| * unbounded lifetime, i.e. objects declared 'static', but if you have |
| * a #GStaticMutex as a member of a structure and the structure is |
| * freed, you should also free the #GStaticMutex. |
| * |
| * Calling g_static_mutex_free() on a locked mutex may result in |
| * undefined behaviour. |
| * |
| * Deprecated: 2.32: Use g_mutex_clear() |
| */ |
| 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.ac. 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; |
| } |
| |
| /* {{{1 GStaticRecMutex */ |
| |
| /** |
| * GStaticRecMutex: |
| * |
| * A #GStaticRecMutex works like a #GStaticMutex, but it can be locked |
| * multiple times by one thread. If you enter it n times, you have to |
| * unlock it n times again to let other threads lock it. An exception |
| * is the function g_static_rec_mutex_unlock_full(): that allows you to |
| * unlock a #GStaticRecMutex completely returning the depth, (i.e. the |
| * number of times this mutex was locked). The depth can later be used |
| * to restore the state of the #GStaticRecMutex by calling |
| * g_static_rec_mutex_lock_full(). In GLib 2.32, #GStaticRecMutex has |
| * been deprecated in favor of #GRecMutex. |
| * |
| * Even though #GStaticRecMutex is not opaque, it should only be used |
| * with the following functions. |
| * |
| * All of the g_static_rec_mutex_* functions can be used even if |
| * g_thread_init() has not been called. Then they do nothing, apart |
| * from g_static_rec_mutex_trylock(), which does nothing but returning |
| * %TRUE. |
| */ |
| |
| /** |
| * G_STATIC_REC_MUTEX_INIT: |
| * |
| * A #GStaticRecMutex must be initialized with this macro before it can |
| * be used. This macro can used be to initialize a variable, but it |
| * cannot be assigned to a variable. In that case you have to use |
| * g_static_rec_mutex_init(). |
| * |
| * |[ |
| * GStaticRecMutex my_mutex = G_STATIC_REC_MUTEX_INIT; |
| * ]| |
| */ |
| |
| /** |
| * g_static_rec_mutex_init: |
| * @mutex: a #GStaticRecMutex to be initialized. |
| * |
| * A #GStaticRecMutex must be initialized with this function before it |
| * can be used. Alternatively you can initialize it with |
| * #G_STATIC_REC_MUTEX_INIT. |
| * |
| * Deprecated: 2.32: Use g_rec_mutex_init() |
| */ |
| 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; |
| } |
| |
| static GRecMutex * |
| g_static_rec_mutex_get_rec_mutex_impl (GStaticRecMutex* mutex) |
| { |
| GRecMutex *result; |
| |
| if (!g_thread_supported ()) |
| return NULL; |
| |
| result = (GRecMutex *) g_atomic_pointer_get (&mutex->mutex.mutex); |
| |
| if (!result) |
| { |
| G_LOCK (g_static_mutex); |
| |
| result = (GRecMutex *) mutex->mutex.mutex; |
| if (!result) |
| { |
| result = g_slice_new (GRecMutex); |
| g_rec_mutex_init (result); |
| g_atomic_pointer_set (&mutex->mutex.mutex, (GMutex *) result); |
| } |
| |
| G_UNLOCK (g_static_mutex); |
| } |
| |
| return result; |
| } |
| |
| /** |
| * g_static_rec_mutex_lock: |
| * @mutex: a #GStaticRecMutex to lock. |
| * |
| * Locks @mutex. If @mutex is already locked by another thread, the |
| * current thread will block until @mutex is unlocked by the other |
| * thread. If @mutex is already locked by the calling thread, this |
| * functions increases the depth of @mutex and returns immediately. |
| * |
| * Deprecated: 2.32: Use g_rec_mutex_lock() |
| */ |
| void |
| g_static_rec_mutex_lock (GStaticRecMutex* mutex) |
| { |
| GRecMutex *rm; |
| rm = g_static_rec_mutex_get_rec_mutex_impl (mutex); |
| g_rec_mutex_lock (rm); |
| mutex->depth++; |
| } |
| |
| /** |
| * g_static_rec_mutex_trylock: |
| * @mutex: a #GStaticRecMutex to lock. |
| * |
| * Tries to lock @mutex. If @mutex is already locked by another thread, |
| * it immediately returns %FALSE. Otherwise it locks @mutex and returns |
| * %TRUE. If @mutex is already locked by the calling thread, this |
| * functions increases the depth of @mutex and immediately returns |
| * %TRUE. |
| * |
| * Returns: %TRUE, if @mutex could be locked. |
| * |
| * Deprecated: 2.32: Use g_rec_mutex_trylock() |
| */ |
| gboolean |
| g_static_rec_mutex_trylock (GStaticRecMutex* mutex) |
| { |
| GRecMutex *rm; |
| rm = g_static_rec_mutex_get_rec_mutex_impl (mutex); |
| |
| if (g_rec_mutex_trylock (rm)) |
| { |
| mutex->depth++; |
| return TRUE; |
| } |
| else |
| return FALSE; |
| } |
| |
| /** |
| * g_static_rec_mutex_unlock: |
| * @mutex: a #GStaticRecMutex to unlock. |
| * |
| * Unlocks @mutex. Another thread will be allowed to lock @mutex only |
| * when it has been unlocked as many times as it had been locked |
| * before. If @mutex is completely unlocked and another thread is |
| * blocked in a g_static_rec_mutex_lock() call for @mutex, it will be |
| * woken and can lock @mutex itself. |
| * |
| * Deprecated: 2.32: Use g_rec_mutex_unlock() |
| */ |
| void |
| g_static_rec_mutex_unlock (GStaticRecMutex* mutex) |
| { |
| GRecMutex *rm; |
| rm = g_static_rec_mutex_get_rec_mutex_impl (mutex); |
| mutex->depth--; |
| g_rec_mutex_unlock (rm); |
| } |
| |
| /** |
| * g_static_rec_mutex_lock_full: |
| * @mutex: a #GStaticRecMutex to lock. |
| * @depth: number of times this mutex has to be unlocked to be |
| * completely unlocked. |
| * |
| * Works like calling g_static_rec_mutex_lock() for @mutex @depth times. |
| * |
| * Deprecated: 2.32: Use g_rec_mutex_lock() |
| */ |
| void |
| g_static_rec_mutex_lock_full (GStaticRecMutex *mutex, |
| guint depth) |
| { |
| GRecMutex *rm; |
| |
| rm = g_static_rec_mutex_get_rec_mutex_impl (mutex); |
| while (depth--) |
| { |
| g_rec_mutex_lock (rm); |
| mutex->depth++; |
| } |
| } |
| |
| /** |
| * g_static_rec_mutex_unlock_full: |
| * @mutex: a #GStaticRecMutex to completely unlock. |
| * |
| * Completely unlocks @mutex. If another thread is blocked in a |
| * g_static_rec_mutex_lock() call for @mutex, it will be woken and can |
| * lock @mutex itself. This function returns the number of times that |
| * @mutex has been locked by the current thread. To restore the state |
| * before the call to g_static_rec_mutex_unlock_full() you can call |
| * g_static_rec_mutex_lock_full() with the depth returned by this |
| * function. |
| * |
| * Returns: number of times @mutex has been locked by the current |
| * thread. |
| * |
| * Deprecated: 2.32: Use g_rec_mutex_unlock() |
| */ |
| guint |
| g_static_rec_mutex_unlock_full (GStaticRecMutex *mutex) |
| { |
| GRecMutex *rm; |
| gint depth; |
| gint i; |
| |
| rm = g_static_rec_mutex_get_rec_mutex_impl (mutex); |
| |
| /* all access to mutex->depth done while still holding the lock */ |
| depth = mutex->depth; |
| i = mutex->depth; |
| mutex->depth = 0; |
| |
| while (i--) |
| g_rec_mutex_unlock (rm); |
| |
| return depth; |
| } |
| |
| /** |
| * g_static_rec_mutex_free: |
| * @mutex: a #GStaticRecMutex to be freed. |
| * |
| * Releases all resources allocated to a #GStaticRecMutex. |
| * |
| * You don't have to call this functions for a #GStaticRecMutex with an |
| * unbounded lifetime, i.e. objects declared 'static', but if you have |
| * a #GStaticRecMutex as a member of a structure and the structure is |
| * freed, you should also free the #GStaticRecMutex. |
| * |
| * Deprecated: 2.32: Use g_rec_mutex_clear() |
| */ |
| void |
| g_static_rec_mutex_free (GStaticRecMutex *mutex) |
| { |
| g_return_if_fail (mutex); |
| |
| if (mutex->mutex.mutex) |
| { |
| GRecMutex *rm = (GRecMutex *) mutex->mutex.mutex; |
| |
| g_rec_mutex_clear (rm); |
| g_slice_free (GRecMutex, rm); |
| } |
| } |
| |
| /* GStaticRWLock {{{1 ----------------------------------------------------- */ |
| |
| /** |
| * GStaticRWLock: |
| * |
| * The #GStaticRWLock struct represents a read-write lock. A read-write |
| * lock can be used for protecting data that some portions of code only |
| * read from, while others also write. In such situations it is |
| * desirable that several readers can read at once, whereas of course |
| * only one writer may write at a time. |
| * |
| * Take a look at the following example: |
| * |[ |
| * GStaticRWLock rwlock = G_STATIC_RW_LOCK_INIT; |
| * GPtrArray *array; |
| * |
| * gpointer |
| * my_array_get (guint index) |
| * { |
| * gpointer retval = NULL; |
| * |
| * if (!array) |
| * return NULL; |
| * |
| * g_static_rw_lock_reader_lock (&rwlock); |
| * if (index < array->len) |
| * retval = g_ptr_array_index (array, index); |
| * g_static_rw_lock_reader_unlock (&rwlock); |
| * |
| * return retval; |
| * } |
| * |
| * void |
| * my_array_set (guint index, gpointer data) |
| * { |
| * g_static_rw_lock_writer_lock (&rwlock); |
| * |
| * if (!array) |
| * array = g_ptr_array_new (); |
| * |
| * if (index >= array->len) |
| * g_ptr_array_set_size (array, index + 1); |
| * g_ptr_array_index (array, index) = data; |
| * |
| * g_static_rw_lock_writer_unlock (&rwlock); |
| * } |
| * ]| |
| * |
| * This example shows an array which can be accessed by many readers |
| * (the my_array_get() function) simultaneously, whereas the writers |
| * (the my_array_set() function) will only be allowed once at a time |
| * and only if no readers currently access the array. This is because |
| * of the potentially dangerous resizing of the array. Using these |
| * functions is fully multi-thread safe now. |
| * |
| * Most of the time, writers should have precedence over readers. That |
| * means, for this implementation, that as soon as a writer wants to |
| * lock the data, no other reader is allowed to lock the data, whereas, |
| * of course, the readers that already have locked the data are allowed |
| * to finish their operation. As soon as the last reader unlocks the |
| * data, the writer will lock it. |
| * |
| * Even though #GStaticRWLock is not opaque, it should only be used |
| * with the following functions. |
| * |
| * All of the g_static_rw_lock_* functions can be used even if |
| * g_thread_init() has not been called. Then they do nothing, apart |
| * from g_static_rw_lock_*_trylock, which does nothing but returning %TRUE. |
| * |
| * A read-write lock has a higher overhead than a mutex. For example, both |
| * g_static_rw_lock_reader_lock() and g_static_rw_lock_reader_unlock() have |
| * to lock and unlock a #GStaticMutex, so it takes at least twice the time |
| * to lock and unlock a #GStaticRWLock that it does to lock and unlock a |
| * #GStaticMutex. So only data structures that are accessed by multiple |
| * readers, and which keep the lock for a considerable time justify a |
| * #GStaticRWLock. The above example most probably would fare better with a |
| * #GStaticMutex. |
| * |
| * Deprecated: 2.32: Use a #GRWLock instead |
| **/ |
| |
| /** |
| * G_STATIC_RW_LOCK_INIT: |
| * |
| * A #GStaticRWLock must be initialized with this macro before it can |
| * be used. This macro can used be to initialize a variable, but it |
| * cannot be assigned to a variable. In that case you have to use |
| * g_static_rw_lock_init(). |
| * |
| * |[ |
| * GStaticRWLock my_lock = G_STATIC_RW_LOCK_INIT; |
| * ]| |
| */ |
| |
| /** |
| * g_static_rw_lock_init: |
| * @lock: a #GStaticRWLock to be initialized. |
| * |
| * A #GStaticRWLock must be initialized with this function before it |
| * can be used. Alternatively you can initialize it with |
| * #G_STATIC_RW_LOCK_INIT. |
| * |
| * Deprecated: 2.32: Use g_rw_lock_init() instead |
| */ |
| 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); |
| } |
| |
| /** |
| * g_static_rw_lock_reader_lock: |
| * @lock: a #GStaticRWLock to lock for reading. |
| * |
| * Locks @lock for reading. There may be unlimited concurrent locks for |
| * reading of a #GStaticRWLock at the same time. If @lock is already |
| * locked for writing by another thread or if another thread is already |
| * waiting to lock @lock for writing, this function will block until |
| * @lock is unlocked by the other writing thread and no other writing |
| * threads want to lock @lock. This lock has to be unlocked by |
| * g_static_rw_lock_reader_unlock(). |
| * |
| * #GStaticRWLock is not recursive. It might seem to be possible to |
| * recursively lock for reading, but that can result in a deadlock, due |
| * to writer preference. |
| * |
| * Deprecated: 2.32: Use g_rw_lock_reader_lock() instead |
| */ |
| 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); |
| } |
| |
| /** |
| * g_static_rw_lock_reader_trylock: |
| * @lock: a #GStaticRWLock to lock for reading |
| * |
| * Tries to lock @lock for reading. If @lock is already locked for |
| * writing by another thread or if another thread is already waiting to |
| * lock @lock for writing, immediately returns %FALSE. Otherwise locks |
| * @lock for reading and returns %TRUE. This lock has to be unlocked by |
| * g_static_rw_lock_reader_unlock(). |
| * |
| * Returns: %TRUE, if @lock could be locked for reading |
| * |
| * Deprecated: 2.32: Use g_rw_lock_reader_trylock() instead |
| */ |
| 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; |
| } |
| |
| /** |
| * g_static_rw_lock_reader_unlock: |
| * @lock: a #GStaticRWLock to unlock after reading |
| * |
| * Unlocks @lock. If a thread waits to lock @lock for writing and all |
| * locks for reading have been unlocked, the waiting thread is woken up |
| * and can lock @lock for writing. |
| * |
| * Deprecated: 2.32: Use g_rw_lock_reader_unlock() instead |
| */ |
| 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); |
| } |
| |
| /** |
| * g_static_rw_lock_writer_lock: |
| * @lock: a #GStaticRWLock to lock for writing |
| * |
| * Locks @lock for writing. If @lock is already locked for writing or |
| * reading by other threads, this function will block until @lock is |
| * completely unlocked and then lock @lock for writing. While this |
| * functions waits to lock @lock, no other thread can lock @lock for |
| * reading. When @lock is locked for writing, no other thread can lock |
| * @lock (neither for reading nor writing). This lock has to be |
| * unlocked by g_static_rw_lock_writer_unlock(). |
| * |
| * Deprecated: 2.32: Use g_rw_lock_writer_lock() instead |
| */ |
| 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); |
| } |
| |
| /** |
| * g_static_rw_lock_writer_trylock: |
| * @lock: a #GStaticRWLock to lock for writing |
| * |
| * Tries to lock @lock for writing. If @lock is already locked (for |
| * either reading or writing) by another thread, it immediately returns |
| * %FALSE. Otherwise it locks @lock for writing and returns %TRUE. This |
| * lock has to be unlocked by g_static_rw_lock_writer_unlock(). |
| * |
| * Returns: %TRUE, if @lock could be locked for writing |
| * |
| * Deprecated: 2.32: Use g_rw_lock_writer_trylock() instead |
| */ |
| 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; |
| } |
| |
| /** |
| * g_static_rw_lock_writer_unlock: |
| * @lock: a #GStaticRWLock to unlock after writing. |
| * |
| * Unlocks @lock. If a thread is waiting to lock @lock for writing and |
| * all locks for reading have been unlocked, the waiting thread is |
| * woken up and can lock @lock for writing. If no thread is waiting to |
| * lock @lock for writing, and some thread or threads are waiting to |
| * lock @lock for reading, the waiting threads are woken up and can |
| * lock @lock for reading. |
| * |
| * Deprecated: 2.32: Use g_rw_lock_writer_unlock() instead |
| */ |
| 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); |
| } |
| |
| /** |
| * g_static_rw_lock_free: |
| * @lock: a #GStaticRWLock to be freed. |
| * |
| * Releases all resources allocated to @lock. |
| * |
| * You don't have to call this functions for a #GStaticRWLock with an |
| * unbounded lifetime, i.e. objects declared 'static', but if you have |
| * a #GStaticRWLock as a member of a structure, and the structure is |
| * freed, you should also free the #GStaticRWLock. |
| * |
| * Deprecated: 2.32: Use a #GRWLock instead |
| */ |
| 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); |
| } |
| |
| /* GPrivate {{{1 ------------------------------------------------------ */ |
| |
| /** |
| * g_private_new: |
| * @notify: a #GDestroyNotify |
| * |
| * Creates a new #GPrivate. |
| * |
| * Deprecated:2.32: dynamic allocation of #GPrivate is a bad idea. Use |
| * static storage and G_PRIVATE_INIT() instead. |
| * |
| * Returns: a newly allocated #GPrivate (which can never be destroyed) |
| */ |
| GPrivate * |
| g_private_new (GDestroyNotify notify) |
| { |
| GPrivate tmp = G_PRIVATE_INIT (notify); |
| GPrivate *key; |
| |
| key = g_slice_new (GPrivate); |
| *key = tmp; |
| |
| return key; |
| } |
| |
| /* {{{1 GStaticPrivate */ |
| |
| typedef struct _GStaticPrivateNode GStaticPrivateNode; |
| struct _GStaticPrivateNode |
| { |
| gpointer data; |
| GDestroyNotify destroy; |
| GStaticPrivate *owner; |
| }; |
| |
| static void |
| g_static_private_cleanup (gpointer data) |
| { |
| GArray *array = 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); |
| } |
| |
| GPrivate static_private_private = G_PRIVATE_INIT (g_static_private_cleanup); |
| |
| /** |
| * GStaticPrivate: |
| * |
| * A #GStaticPrivate works almost like a #GPrivate, but it has one |
| * significant advantage. It doesn't need to be created at run-time |
| * like a #GPrivate, but can be defined at compile-time. This is |
| * similar to the difference between #GMutex and #GStaticMutex. |
| * |
| * Now look at our give_me_next_number() example with #GStaticPrivate: |
| * |[ |
| * int |
| * give_me_next_number () |
| * { |
| * static GStaticPrivate current_number_key = G_STATIC_PRIVATE_INIT; |
| * int *current_number = g_static_private_get (¤t_number_key); |
| * |
| * if (!current_number) |
| * { |
| * current_number = g_new (int, 1); |
| * *current_number = 0; |
| * g_static_private_set (¤t_number_key, current_number, g_free); |
| * } |
| * |
| * *current_number = calc_next_number (*current_number); |
| * |
| * return *current_number; |
| * } |
| * ]| |
| */ |
| |
| /** |
| * G_STATIC_PRIVATE_INIT: |
| * |
| * Every #GStaticPrivate must be initialized with this macro, before it |
| * can be used. |
| * |
| * |[ |
| * GStaticPrivate my_private = G_STATIC_PRIVATE_INIT; |
| * ]| |
| */ |
| |
| /** |
| * g_static_private_init: |
| * @private_key: a #GStaticPrivate to be initialized |
| * |
| * Initializes @private_key. Alternatively you can initialize it with |
| * #G_STATIC_PRIVATE_INIT. |
| */ |
| void |
| g_static_private_init (GStaticPrivate *private_key) |
| { |
| private_key->index = 0; |
| } |
| |
| /** |
| * g_static_private_get: |
| * @private_key: a #GStaticPrivate |
| * |
| * Works like g_private_get() only for a #GStaticPrivate. |
| * |
| * This function works even if g_thread_init() has not yet been called. |
| * |
| * Returns: the corresponding pointer |
| */ |
| gpointer |
| g_static_private_get (GStaticPrivate *private_key) |
| { |
| GArray *array; |
| gpointer ret = NULL; |
| |
| array = g_private_get (&static_private_private); |
| |
| if (array && private_key->index != 0 && private_key->index <= array->len) |
| { |
| GStaticPrivateNode *node; |
| |
| node = &g_array_index (array, GStaticPrivateNode, private_key->index - 1); |
| |
| /* Deal with the possibility that the GStaticPrivate which used |
| * to have this index got freed and the index got allocated to |
| * a new one. In this case, the data in the node is stale, so |
| * free it and return NULL. |
| */ |
| if (G_UNLIKELY (node->owner != private_key)) |
| { |
| if (node->destroy) |
| node->destroy (node->data); |
| node->destroy = NULL; |
| node->data = NULL; |
| node->owner = NULL; |
| } |
| ret = node->data; |
| } |
| |
| return ret; |
| } |
| |
| /** |
| * g_static_private_set: |
| * @private_key: a #GStaticPrivate |
| * @data: the new pointer |
| * @notify: a function to be called with the pointer whenever the |
| * current thread ends or sets this pointer again |
| * |
| * Sets the pointer keyed to @private_key for the current thread and |
| * the function @notify to be called with that pointer (%NULL or |
| * non-%NULL), whenever the pointer is set again or whenever the |
| * current thread ends. |
| * |
| * This function works even if g_thread_init() has not yet been called. |
| * If g_thread_init() is called later, the @data keyed to @private_key |
| * will be inherited only by the main thread, i.e. the one that called |
| * g_thread_init(). |
| * |
| * @notify is used quite differently from @destructor in g_private_new(). |
| */ |
| void |
| g_static_private_set (GStaticPrivate *private_key, |
| gpointer data, |
| GDestroyNotify notify) |
| { |
| GArray *array; |
| static guint next_index = 0; |
| GStaticPrivateNode *node; |
| |
| if (!private_key->index) |
| { |
| G_LOCK (g_thread); |
| |
| if (!private_key->index) |
| { |
| if (g_thread_free_indices) |
| { |
| private_key->index = GPOINTER_TO_UINT (g_thread_free_indices->data); |
| g_thread_free_indices = g_slist_delete_link (g_thread_free_indices, |
| g_thread_free_indices); |
| } |
| else |
| private_key->index = ++next_index; |
| } |
| |
| G_UNLOCK (g_thread); |
| } |
| |
| array = g_private_get (&static_private_private); |
| if (!array) |
| { |
| array = g_array_new (FALSE, TRUE, sizeof (GStaticPrivateNode)); |
| g_private_set (&static_private_private, array); |
| } |
| 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) |
| node->destroy (node->data); |
| |
| node->data = data; |
| node->destroy = notify; |
| node->owner = private_key; |
| } |
| |
| /** |
| * g_static_private_free: |
| * @private_key: a #GStaticPrivate to be freed |
| * |
| * Releases all resources allocated to @private_key. |
| * |
| * You don't have to call this functions for a #GStaticPrivate with an |
| * unbounded lifetime, i.e. objects declared 'static', but if you have |
| * a #GStaticPrivate as a member of a structure and the structure is |
| * freed, you should also free the #GStaticPrivate. |
| */ |
| void |
| g_static_private_free (GStaticPrivate *private_key) |
| { |
| guint idx = private_key->index; |
| |
| if (!idx) |
| return; |
| |
| private_key->index = 0; |
| |
| /* Freeing the per-thread data is deferred to either the |
| * thread end or the next g_static_private_get() call for |
| * the same index. |
| */ |
| G_LOCK (g_thread); |
| g_thread_free_indices = g_slist_prepend (g_thread_free_indices, |
| GUINT_TO_POINTER (idx)); |
| G_UNLOCK (g_thread); |
| } |
| |
| /* GMutex {{{1 ------------------------------------------------------ */ |
| |
| /** |
| * g_mutex_new: |
| * |
| * Allocates and initializes a new #GMutex. |
| * |
| * Returns: a newly allocated #GMutex. Use g_mutex_free() to free |
| * |
| * Deprecated: 2.32: GMutex can now be statically allocated, or embedded |
| * in structures and initialised with g_mutex_init(). |
| */ |
| GMutex * |
| g_mutex_new (void) |
| { |
| GMutex *mutex; |
| |
| mutex = g_slice_new (GMutex); |
| g_mutex_init (mutex); |
| |
| return mutex; |
| } |
| |
| /** |
| * g_mutex_free: |
| * @mutex: a #GMutex |
| * |
| * Destroys a @mutex that has been created with g_mutex_new(). |
| * |
| * Calling g_mutex_free() on a locked mutex may result |
| * in undefined behaviour. |
| * |
| * Deprecated: 2.32: GMutex can now be statically allocated, or embedded |
| * in structures and initialised with g_mutex_init(). |
| */ |
| void |
| g_mutex_free (GMutex *mutex) |
| { |
| g_mutex_clear (mutex); |
| g_slice_free (GMutex, mutex); |
| } |
| |
| /* GCond {{{1 ------------------------------------------------------ */ |
| |
| /** |
| * g_cond_new: |
| * |
| * Allocates and initializes a new #GCond. |
| * |
| * Returns: a newly allocated #GCond. Free with g_cond_free() |
| * |
| * Deprecated: 2.32: GCond can now be statically allocated, or embedded |
| * in structures and initialised with g_cond_init(). |
| */ |
| GCond * |
| g_cond_new (void) |
| { |
| GCond *cond; |
| |
| cond = g_slice_new (GCond); |
| g_cond_init (cond); |
| |
| return cond; |
| } |
| |
| /** |
| * g_cond_free: |
| * @cond: a #GCond |
| * |
| * Destroys a #GCond that has been created with g_cond_new(). |
| * |
| * Calling g_cond_free() for a #GCond on which threads are |
| * blocking leads to undefined behaviour. |
| * |
| * Deprecated: 2.32: GCond can now be statically allocated, or embedded |
| * in structures and initialised with g_cond_init(). |
| */ |
| void |
| g_cond_free (GCond *cond) |
| { |
| g_cond_clear (cond); |
| g_slice_free (GCond, cond); |
| } |
| |
| /** |
| * g_cond_timed_wait: |
| * @cond: a #GCond |
| * @mutex: a #GMutex that is currently locked |
| * @abs_time: a #GTimeVal, determining the final time |
| * |
| * Waits until this thread is woken up on @cond, but not longer than |
| * until the time specified by @abs_time. The @mutex is unlocked before |
| * falling asleep and locked again before resuming. |
| * |
| * If @abs_time is %NULL, g_cond_timed_wait() acts like g_cond_wait(). |
| * |
| * This function can be used even if g_thread_init() has not yet been |
| * called, and, in that case, will immediately return %TRUE. |
| * |
| * To easily calculate @abs_time a combination of g_get_real_time() |
| * and g_time_val_add() can be used. |
| * |
| * Returns: %TRUE if @cond was signalled, or %FALSE on timeout |
| * |
| * Deprecated:2.32: Use g_cond_wait_until() instead. |
| */ |
| gboolean |
| g_cond_timed_wait (GCond *cond, |
| GMutex *mutex, |
| GTimeVal *abs_time) |
| { |
| gint64 end_time; |
| |
| if (abs_time == NULL) |
| { |
| g_cond_wait (cond, mutex); |
| return TRUE; |
| } |
| |
| end_time = abs_time->tv_sec; |
| end_time *= 1000000; |
| end_time += abs_time->tv_usec; |
| |
| /* would be nice if we had clock_rtoffset, but that didn't seem to |
| * make it into the kernel yet... |
| */ |
| end_time += g_get_monotonic_time () - g_get_real_time (); |
| |
| return g_cond_wait_until (cond, mutex, end_time); |
| } |
| |
| /* {{{1 Epilogue */ |
| /* vim: set foldmethod=marker: */ |