--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/glib/libglib/src/gthreadpool.c Tue Feb 02 02:01:42 2010 +0200
@@ -0,0 +1,991 @@
+/* GLIB - Library of useful routines for C programming
+ * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
+ *
+ * GAsyncQueue: thread pool implementation.
+ * Copyright (C) 2000 Sebastian Wilhelmi; University of Karlsruhe
+ * 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.
+ */
+
+/*
+ * MT safe
+ */
+
+#include "config.h"
+
+#include "glib.h"
+#include "galias.h"
+
+#ifdef __SYMBIAN32__
+#include <glib_wsd.h>
+#endif /* __SYMBIAN32__ */
+
+#if EMULATOR
+#define g_thread_functions_for_glib_use (*_g_thread_functions_for_glib_use())
+#define g_thread_use_default_impl (*_g_thread_use_default_impl())
+#endif /* EMULATOR */
+
+#define DEBUG_MSG(x)
+/* #define DEBUG_MSG(args) g_printerr args ; g_printerr ("\n"); */
+
+
+typedef struct _GRealThreadPool GRealThreadPool;
+
+struct _GRealThreadPool
+{
+ GThreadPool pool;
+ GAsyncQueue* queue;
+ GCond* cond;
+ gint max_threads;
+ gint num_threads;
+ gboolean running;
+ gboolean immediate;
+ gboolean waiting;
+ GCompareDataFunc sort_func;
+ gpointer sort_user_data;
+};
+
+/* The following is just an address to mark the wakeup order for a
+ * thread, it could be any address (as long, as it isn't a valid
+ * GThreadPool address) */
+#if EMULATOR
+
+PLS(wakeup_thread_serial,gthreadpool,gint)
+PLS(unused_thread_queue,gthreadpool,GAsyncQueue *)
+PLS(unused_threads,gthreadpool,gint)
+PLS(max_unused_threads,gthreadpool,gint)
+PLS(kill_unused_threads,gthreadpool,gint)
+PLS(max_idle_time,gthreadpool,guint)
+
+#define wakeup_thread_serial (*FUNCTION_NAME(wakeup_thread_serial,gthreadpool)())
+#define unused_thread_queue (*FUNCTION_NAME(unused_thread_queue,gthreadpool)())
+#define unused_threads (*FUNCTION_NAME(unused_threads,gthreadpool)())
+#define max_unused_threads (*FUNCTION_NAME(max_unused_threads,gthreadpool)())
+#define kill_unused_threads (*FUNCTION_NAME(kill_unused_threads,gthreadpool)())
+#define max_idle_time (*FUNCTION_NAME(max_idle_time,gthreadpool)())
+
+#else
+
+static gint wakeup_thread_serial = 0;
+
+/* Here all unused threads are waiting */
+static GAsyncQueue *unused_thread_queue = NULL;
+static gint unused_threads = 0;
+static gint max_unused_threads = 0;
+static gint kill_unused_threads = 0;
+static guint max_idle_time = 0;
+
+#endif /* EMULATOR */
+
+static gconstpointer const wakeup_thread_marker = (gconstpointer) &g_thread_pool_new;
+
+static void g_thread_pool_queue_push_unlocked (GRealThreadPool *pool,
+ gpointer data);
+static void g_thread_pool_free_internal (GRealThreadPool *pool);
+static gpointer g_thread_pool_thread_proxy (gpointer data);
+static void g_thread_pool_start_thread (GRealThreadPool *pool,
+ GError **error);
+static void g_thread_pool_wakeup_and_stop_all (GRealThreadPool *pool);
+static GRealThreadPool* g_thread_pool_wait_for_new_pool (void);
+static gpointer g_thread_pool_wait_for_new_task (GRealThreadPool *pool);
+
+static void
+g_thread_pool_queue_push_unlocked (GRealThreadPool *pool,
+ gpointer data)
+{
+ if (pool->sort_func)
+ g_async_queue_push_sorted_unlocked (pool->queue,
+ data,
+ pool->sort_func,
+ pool->sort_user_data);
+ else
+ g_async_queue_push_unlocked (pool->queue, data);
+}
+
+static GRealThreadPool*
+g_thread_pool_wait_for_new_pool (void)
+{
+ GRealThreadPool *pool;
+ gint local_wakeup_thread_serial;
+ guint local_max_unused_threads;
+ gint local_max_idle_time;
+ gint last_wakeup_thread_serial;
+ gboolean have_relayed_thread_marker = FALSE;
+
+ local_max_unused_threads = g_atomic_int_get (&max_unused_threads);
+ local_max_idle_time = g_atomic_int_get (&max_idle_time);
+ last_wakeup_thread_serial = g_atomic_int_get (&wakeup_thread_serial);
+
+ g_atomic_int_inc (&unused_threads);
+
+ do
+ {
+ if (g_atomic_int_get (&unused_threads) >= local_max_unused_threads)
+ {
+ /* If this is a superfluous thread, stop it. */
+ pool = NULL;
+ }
+ else if (local_max_idle_time > 0)
+ {
+ /* If a maximal idle time is given, wait for the given time. */
+ GTimeVal end_time;
+
+ g_get_current_time (&end_time);
+ g_time_val_add (&end_time, local_max_idle_time * 1000);
+
+ DEBUG_MSG (("thread %p waiting in global pool for %f seconds.",
+ g_thread_self (), local_max_idle_time / 1000.0));
+
+ pool = g_async_queue_timed_pop (unused_thread_queue, &end_time);
+ }
+ else
+ {
+ /* If no maximal idle time is given, wait indefinitely. */
+ DEBUG_MSG (("thread %p waiting in global pool.",
+ g_thread_self ()));
+ pool = g_async_queue_pop (unused_thread_queue);
+ }
+
+ if (pool == wakeup_thread_marker)
+ {
+ local_wakeup_thread_serial = g_atomic_int_get (&wakeup_thread_serial);
+ if (last_wakeup_thread_serial == local_wakeup_thread_serial)
+ {
+ if (!have_relayed_thread_marker)
+ {
+ /* If this wakeup marker has been received for
+ * the second time, relay it.
+ */
+ DEBUG_MSG (("thread %p relaying wakeup message to "
+ "waiting thread with lower serial.",
+ g_thread_self ()));
+
+ g_async_queue_push (unused_thread_queue, FIX_CASTING(void *)wakeup_thread_marker);
+ have_relayed_thread_marker = TRUE;
+
+ /* If a wakeup marker has been relayed, this thread
+ * will get out of the way for 100 microseconds to
+ * avoid receiving this marker again. */
+ g_usleep (100);
+ }
+ }
+ else
+ {
+ if (g_atomic_int_exchange_and_add (&kill_unused_threads, -1) > 0)
+ {
+ pool = NULL;
+ break;
+ }
+
+ DEBUG_MSG (("thread %p updating to new limits.",
+ g_thread_self ()));
+
+ local_max_unused_threads = g_atomic_int_get (&max_unused_threads);
+ local_max_idle_time = g_atomic_int_get (&max_idle_time);
+ last_wakeup_thread_serial = local_wakeup_thread_serial;
+
+ have_relayed_thread_marker = FALSE;
+ }
+ }
+ }
+ while (pool == wakeup_thread_marker);
+
+ g_atomic_int_add (&unused_threads, -1);
+
+ return pool;
+}
+
+static gpointer
+g_thread_pool_wait_for_new_task (GRealThreadPool *pool)
+{
+ gpointer task = NULL;
+
+ if (pool->running || (!pool->immediate &&
+ g_async_queue_length_unlocked (pool->queue) > 0))
+ {
+ /* This thread pool is still active. */
+ if (pool->num_threads > pool->max_threads && pool->max_threads != -1)
+ {
+ /* This is a superfluous thread, so it goes to the global pool. */
+ DEBUG_MSG (("superfluous thread %p in pool %p.",
+ g_thread_self (), pool));
+ }
+ else if (pool->pool.exclusive)
+ {
+ /* Exclusive threads stay attached to the pool. */
+ task = g_async_queue_pop_unlocked (pool->queue);
+
+ DEBUG_MSG (("thread %p in exclusive pool %p waits for task "
+ "(%d running, %d unprocessed).",
+ g_thread_self (), pool, pool->num_threads,
+ g_async_queue_length_unlocked (pool->queue)));
+ }
+ else
+ {
+ /* A thread will wait for new tasks for at most 1/2
+ * second before going to the global pool.
+ */
+ GTimeVal end_time;
+
+ g_get_current_time (&end_time);
+ g_time_val_add (&end_time, G_USEC_PER_SEC / 2); /* 1/2 second */
+
+ DEBUG_MSG (("thread %p in pool %p waits for up to a 1/2 second for task "
+ "(%d running, %d unprocessed).",
+ g_thread_self (), pool, pool->num_threads,
+ g_async_queue_length_unlocked (pool->queue)));
+
+ task = g_async_queue_timed_pop_unlocked (pool->queue, &end_time);
+ }
+ }
+ else
+ {
+ /* This thread pool is inactive, it will no longer process tasks. */
+ DEBUG_MSG (("pool %p not active, thread %p will go to global pool "
+ "(running: %s, immediate: %s, len: %d).",
+ pool, g_thread_self (),
+ pool->running ? "true" : "false",
+ pool->immediate ? "true" : "false",
+ g_async_queue_length_unlocked (pool->queue)));
+ }
+
+ return task;
+}
+
+
+static gpointer
+g_thread_pool_thread_proxy (gpointer data)
+{
+ GRealThreadPool *pool;
+
+ pool = data;
+
+ DEBUG_MSG (("thread %p started for pool %p.",
+ g_thread_self (), pool));
+
+ g_async_queue_lock (pool->queue);
+
+ while (TRUE)
+ {
+ gpointer task;
+
+ task = g_thread_pool_wait_for_new_task (pool);
+ if (task)
+ {
+ if (pool->running || !pool->immediate)
+ {
+ /* A task was received and the thread pool is active, so
+ * execute the function.
+ */
+ g_async_queue_unlock (pool->queue);
+ DEBUG_MSG (("thread %p in pool %p calling func.",
+ g_thread_self (), pool));
+ pool->pool.func (task, pool->pool.user_data);
+ g_async_queue_lock (pool->queue);
+ }
+ }
+ else
+ {
+ /* No task was received, so this thread goes to the global
+ * pool.
+ */
+ gboolean free_pool = FALSE;
+
+ DEBUG_MSG (("thread %p leaving pool %p for global pool.",
+ g_thread_self (), pool));
+ pool->num_threads--;
+
+ if (!pool->running)
+ {
+ if (!pool->waiting)
+ {
+ if (pool->num_threads == 0)
+ {
+ /* If the pool is not running and no other
+ * thread is waiting for this thread pool to
+ * finish and this is the last thread of this
+ * pool, free the pool.
+ */
+ free_pool = TRUE;
+ }
+ else
+ {
+ /* If the pool is not running and no other
+ * thread is waiting for this thread pool to
+ * finish and this is not the last thread of
+ * this pool and there are no tasks left in the
+ * queue, wakeup the remaining threads.
+ */
+ if (g_async_queue_length_unlocked (pool->queue) ==
+ - pool->num_threads)
+ g_thread_pool_wakeup_and_stop_all (pool);
+ }
+ }
+ else if (pool->immediate ||
+ g_async_queue_length_unlocked (pool->queue) <= 0)
+ {
+ /* If the pool is not running and another thread is
+ * waiting for this thread pool to finish and there
+ * are either no tasks left or the pool shall stop
+ * immediatly, inform the waiting thread of a change
+ * of the thread pool state.
+ */
+ g_cond_broadcast (pool->cond);
+ }
+ }
+
+ g_async_queue_unlock (pool->queue);
+
+ if (free_pool)
+ g_thread_pool_free_internal (pool);
+
+ if ((pool = g_thread_pool_wait_for_new_pool ()) == NULL)
+ break;
+
+ g_async_queue_lock (pool->queue);
+
+ DEBUG_MSG (("thread %p entering pool %p from global pool.",
+ g_thread_self (), pool));
+
+ /* pool->num_threads++ is not done here, but in
+ * g_thread_pool_start_thread to make the new started thread
+ * known to the pool, before itself can do it.
+ */
+ }
+ }
+
+ return NULL;
+}
+
+static void
+g_thread_pool_start_thread (GRealThreadPool *pool,
+ GError **error)
+{
+ gboolean success = FALSE;
+
+ if (pool->num_threads >= pool->max_threads && pool->max_threads != -1)
+ /* Enough threads are already running */
+ return;
+
+ g_async_queue_lock (unused_thread_queue);
+
+ if (g_async_queue_length_unlocked (unused_thread_queue) < 0)
+ {
+ g_async_queue_push_unlocked (unused_thread_queue, pool);
+ success = TRUE;
+ }
+
+ g_async_queue_unlock (unused_thread_queue);
+
+ if (!success)
+ {
+ GError *local_error = NULL;
+ /* No thread was found, we have to start a new one */
+ g_thread_create (g_thread_pool_thread_proxy, pool, FALSE, &local_error);
+
+ if (local_error)
+ {
+ g_propagate_error (error, local_error);
+ return;
+ }
+ }
+
+ /* See comment in g_thread_pool_thread_proxy as to why this is done
+ * here and not there
+ */
+ pool->num_threads++;
+}
+
+/**
+ * g_thread_pool_new:
+ * @func: a function to execute in the threads of the new thread pool
+ * @user_data: user data that is handed over to @func every time it
+ * is called
+ * @max_threads: the maximal number of threads to execute concurrently in
+ * the new thread pool, -1 means no limit
+ * @exclusive: should this thread pool be exclusive?
+ * @error: return location for error
+ *
+ * This function creates a new thread pool.
+ *
+ * Whenever you call g_thread_pool_push(), either a new thread is
+ * created or an unused one is reused. At most @max_threads threads
+ * are running concurrently for this thread pool. @max_threads = -1
+ * allows unlimited threads to be created for this thread pool. The
+ * newly created or reused thread now executes the function @func with
+ * the two arguments. The first one is the parameter to
+ * g_thread_pool_push() and the second one is @user_data.
+ *
+ * The parameter @exclusive determines, whether the thread pool owns
+ * all threads exclusive or whether the threads are shared
+ * globally. If @exclusive is %TRUE, @max_threads threads are started
+ * immediately and they will run exclusively for this thread pool until
+ * it is destroyed by g_thread_pool_free(). If @exclusive is %FALSE,
+ * threads are created, when needed and shared between all
+ * non-exclusive thread pools. This implies that @max_threads may not
+ * be -1 for exclusive thread pools.
+ *
+ * @error can be %NULL to ignore errors, or non-%NULL to report
+ * errors. An error can only occur when @exclusive is set to %TRUE and
+ * not all @max_threads threads could be created.
+ *
+ * Return value: the new #GThreadPool
+ **/
+
+#if EMULATOR
+
+PLS_MACRO(init,g_thread_pool_new,GStaticMutex)
+#define g__init_lock (*FUNCTION_NAME_MACRO(init,g_thread_pool_new)())
+
+#endif /* EMULATOR */
+
+EXPORT_C GThreadPool*
+g_thread_pool_new (GFunc func,
+ gpointer user_data,
+ gint max_threads,
+ gboolean exclusive,
+ GError **error)
+{
+ GRealThreadPool *retval;
+
+ #if !(EMULATOR)
+ G_LOCK_DEFINE_STATIC (init);
+ #endif /* !(EMULATOR) */
+
+ g_return_val_if_fail (func, NULL);
+ g_return_val_if_fail (!exclusive || max_threads != -1, NULL);
+ g_return_val_if_fail (max_threads >= -1, NULL);
+ g_return_val_if_fail (g_thread_supported (), NULL);
+ retval = g_new (GRealThreadPool, 1);
+
+ retval->pool.func = func;
+ retval->pool.user_data = user_data;
+ retval->pool.exclusive = exclusive;
+ retval->queue = g_async_queue_new ();
+ retval->cond = NULL;
+ retval->max_threads = max_threads;
+ retval->num_threads = 0;
+ retval->running = TRUE;
+ retval->sort_func = NULL;
+ retval->sort_user_data = NULL;
+
+ G_LOCK (init);
+ if (!unused_thread_queue)
+ unused_thread_queue = g_async_queue_new ();
+ G_UNLOCK (init);
+
+ if (retval->pool.exclusive)
+ {
+ g_async_queue_lock (retval->queue);
+
+ while (retval->num_threads < retval->max_threads)
+ {
+ GError *local_error = NULL;
+ g_thread_pool_start_thread (retval, &local_error);
+ if (local_error)
+ {
+ g_propagate_error (error, local_error);
+ break;
+ }
+ }
+
+ g_async_queue_unlock (retval->queue);
+ }
+
+ return (GThreadPool*) retval;
+}
+
+#if EMULATOR
+#undef init
+#endif /* EMULATOR */
+
+/**
+ * g_thread_pool_push:
+ * @pool: a #GThreadPool
+ * @data: a new task for @pool
+ * @error: return location for error
+ *
+ * Inserts @data into the list of tasks to be executed by @pool. When
+ * the number of currently running threads is lower than the maximal
+ * allowed number of threads, a new thread is started (or reused) with
+ * the properties given to g_thread_pool_new (). Otherwise @data stays
+ * in the queue until a thread in this pool finishes its previous task
+ * and processes @data.
+ *
+ * @error can be %NULL to ignore errors, or non-%NULL to report
+ * errors. An error can only occur when a new thread couldn't be
+ * created. In that case @data is simply appended to the queue of work
+ * to do.
+ **/
+EXPORT_C void
+g_thread_pool_push (GThreadPool *pool,
+ gpointer data,
+ GError **error)
+{
+ GRealThreadPool *real;
+
+ real = (GRealThreadPool*) pool;
+
+ g_return_if_fail (real);
+ g_return_if_fail (real->running);
+
+ g_async_queue_lock (real->queue);
+
+ if (g_async_queue_length_unlocked (real->queue) >= 0)
+ /* No thread is waiting in the queue */
+ g_thread_pool_start_thread (real, error);
+
+ g_thread_pool_queue_push_unlocked (real, data);
+ g_async_queue_unlock (real->queue);
+}
+
+/**
+ * g_thread_pool_set_max_threads:
+ * @pool: a #GThreadPool
+ * @max_threads: a new maximal number of threads for @pool
+ * @error: return location for error
+ *
+ * Sets the maximal allowed number of threads for @pool. A value of -1
+ * means, that the maximal number of threads is unlimited.
+ *
+ * Setting @max_threads to 0 means stopping all work for @pool. It is
+ * effectively frozen until @max_threads is set to a non-zero value
+ * again.
+ *
+ * A thread is never terminated while calling @func, as supplied by
+ * g_thread_pool_new (). Instead the maximal number of threads only
+ * has effect for the allocation of new threads in g_thread_pool_push().
+ * A new thread is allocated, whenever the number of currently
+ * running threads in @pool is smaller than the maximal number.
+ *
+ * @error can be %NULL to ignore errors, or non-%NULL to report
+ * errors. An error can only occur when a new thread couldn't be
+ * created.
+ **/
+EXPORT_C void
+g_thread_pool_set_max_threads (GThreadPool *pool,
+ gint max_threads,
+ GError **error)
+{
+ GRealThreadPool *real;
+ gint to_start;
+
+ real = (GRealThreadPool*) pool;
+
+ g_return_if_fail (real);
+ g_return_if_fail (real->running);
+ g_return_if_fail (!real->pool.exclusive || max_threads != -1);
+ g_return_if_fail (max_threads >= -1);
+
+ g_async_queue_lock (real->queue);
+
+ real->max_threads = max_threads;
+
+ if (pool->exclusive)
+ to_start = real->max_threads - real->num_threads;
+ else
+ to_start = g_async_queue_length_unlocked (real->queue);
+
+ for ( ; to_start > 0; to_start--)
+ {
+ GError *local_error = NULL;
+
+ g_thread_pool_start_thread (real, &local_error);
+ if (local_error)
+ {
+ g_propagate_error (error, local_error);
+ break;
+ }
+ }
+
+ g_async_queue_unlock (real->queue);
+}
+
+/**
+ * g_thread_pool_get_max_threads:
+ * @pool: a #GThreadPool
+ *
+ * Returns the maximal number of threads for @pool.
+ *
+ * Return value: the maximal number of threads
+ **/
+EXPORT_C gint
+g_thread_pool_get_max_threads (GThreadPool *pool)
+{
+ GRealThreadPool *real;
+ gint retval;
+
+ real = (GRealThreadPool*) pool;
+
+ g_return_val_if_fail (real, 0);
+ g_return_val_if_fail (real->running, 0);
+
+ g_async_queue_lock (real->queue);
+ retval = real->max_threads;
+ g_async_queue_unlock (real->queue);
+
+ return retval;
+}
+
+/**
+ * g_thread_pool_get_num_threads:
+ * @pool: a #GThreadPool
+ *
+ * Returns the number of threads currently running in @pool.
+ *
+ * Return value: the number of threads currently running
+ **/
+EXPORT_C guint
+g_thread_pool_get_num_threads (GThreadPool *pool)
+{
+ GRealThreadPool *real;
+ guint retval;
+
+ real = (GRealThreadPool*) pool;
+
+ g_return_val_if_fail (real, 0);
+ g_return_val_if_fail (real->running, 0);
+
+ g_async_queue_lock (real->queue);
+ retval = real->num_threads;
+ g_async_queue_unlock (real->queue);
+
+ return retval;
+}
+
+/**
+ * g_thread_pool_unprocessed:
+ * @pool: a #GThreadPool
+ *
+ * Returns the number of tasks still unprocessed in @pool.
+ *
+ * Return value: the number of unprocessed tasks
+ **/
+EXPORT_C guint
+g_thread_pool_unprocessed (GThreadPool *pool)
+{
+ GRealThreadPool *real;
+ gint unprocessed;
+
+ real = (GRealThreadPool*) pool;
+
+ g_return_val_if_fail (real, 0);
+ g_return_val_if_fail (real->running, 0);
+
+ unprocessed = g_async_queue_length (real->queue);
+
+ return MAX (unprocessed, 0);
+}
+
+/**
+ * g_thread_pool_free:
+ * @pool: a #GThreadPool
+ * @immediate: should @pool shut down immediately?
+ * @wait: should the function wait for all tasks to be finished?
+ *
+ * Frees all resources allocated for @pool.
+ *
+ * If @immediate is %TRUE, no new task is processed for
+ * @pool. Otherwise @pool is not freed before the last task is
+ * processed. Note however, that no thread of this pool is
+ * interrupted, while processing a task. Instead at least all still
+ * running threads can finish their tasks before the @pool is freed.
+ *
+ * If @wait is %TRUE, the functions does not return before all tasks
+ * to be processed (dependent on @immediate, whether all or only the
+ * currently running) are ready. Otherwise the function returns immediately.
+ *
+ * After calling this function @pool must not be used anymore.
+ **/
+EXPORT_C void
+g_thread_pool_free (GThreadPool *pool,
+ gboolean immediate,
+ gboolean wait)
+{
+ GRealThreadPool *real;
+
+ real = (GRealThreadPool*) pool;
+
+ g_return_if_fail (real);
+ g_return_if_fail (real->running);
+
+ /* If there's no thread allowed here, there is not much sense in
+ * not stopping this pool immediately, when it's not empty
+ */
+ g_return_if_fail (immediate ||
+ real->max_threads != 0 ||
+ g_async_queue_length (real->queue) == 0);
+
+ g_async_queue_lock (real->queue);
+
+ real->running = FALSE;
+ real->immediate = immediate;
+ real->waiting = wait;
+
+ if (wait)
+ {
+ real->cond = g_cond_new ();
+
+ while (g_async_queue_length_unlocked (real->queue) != -real->num_threads &&
+ !(immediate && real->num_threads == 0))
+ g_cond_wait (real->cond, _g_async_queue_get_mutex (real->queue));
+ }
+
+ if (immediate || g_async_queue_length_unlocked (real->queue) == -real->num_threads)
+ {
+ /* No thread is currently doing something (and nothing is left
+ * to process in the queue)
+ */
+ if (real->num_threads == 0)
+ {
+ /* No threads left, we clean up */
+ g_async_queue_unlock (real->queue);
+ g_thread_pool_free_internal (real);
+ return;
+ }
+
+ g_thread_pool_wakeup_and_stop_all (real);
+ }
+
+ /* The last thread should cleanup the pool */
+ real->waiting = FALSE;
+ g_async_queue_unlock (real->queue);
+}
+
+static void
+g_thread_pool_free_internal (GRealThreadPool* pool)
+{
+ g_return_if_fail (pool);
+ g_return_if_fail (pool->running == FALSE);
+ g_return_if_fail (pool->num_threads == 0);
+
+ g_async_queue_unref (pool->queue);
+
+ if (pool->cond)
+ g_cond_free (pool->cond);
+
+ g_free (pool);
+}
+
+static void
+g_thread_pool_wakeup_and_stop_all (GRealThreadPool* pool)
+{
+ guint i;
+
+ g_return_if_fail (pool);
+ g_return_if_fail (pool->running == FALSE);
+ g_return_if_fail (pool->num_threads != 0);
+
+ pool->immediate = TRUE;
+
+ for (i = 0; i < pool->num_threads; i++)
+ g_thread_pool_queue_push_unlocked (pool, GUINT_TO_POINTER (1));
+}
+
+/**
+ * g_thread_pool_set_max_unused_threads:
+ * @max_threads: maximal number of unused threads
+ *
+ * Sets the maximal number of unused threads to @max_threads. If
+ * @max_threads is -1, no limit is imposed on the number of unused
+ * threads.
+ **/
+EXPORT_C void
+g_thread_pool_set_max_unused_threads (gint max_threads)
+{
+ g_return_if_fail (max_threads >= -1);
+
+ g_atomic_int_set (&max_unused_threads, max_threads);
+
+ if (max_threads != -1)
+ {
+ max_threads -= g_atomic_int_get (&unused_threads);
+ if (max_threads < 0)
+ {
+ g_atomic_int_set (&kill_unused_threads, -max_threads);
+ g_atomic_int_inc (&wakeup_thread_serial);
+
+ g_async_queue_lock (unused_thread_queue);
+
+ do
+ {
+ g_async_queue_push_unlocked (unused_thread_queue,
+ FIX_CASTING(void *)wakeup_thread_marker);
+ }
+ while (++max_threads);
+
+ g_async_queue_unlock (unused_thread_queue);
+ }
+ }
+}
+
+/**
+ * g_thread_pool_get_max_unused_threads:
+ *
+ * Returns the maximal allowed number of unused threads.
+ *
+ * Return value: the maximal number of unused threads
+ **/
+EXPORT_C gint
+g_thread_pool_get_max_unused_threads (void)
+{
+ return g_atomic_int_get (&max_unused_threads);
+}
+
+/**
+ * g_thread_pool_get_num_unused_threads:
+ *
+ * Returns the number of currently unused threads.
+ *
+ * Return value: the number of currently unused threads
+ **/
+EXPORT_C guint
+g_thread_pool_get_num_unused_threads (void)
+{
+ return g_atomic_int_get (&unused_threads);
+}
+
+/**
+ * g_thread_pool_stop_unused_threads:
+ *
+ * Stops all currently unused threads. This does not change the
+ * maximal number of unused threads. This function can be used to
+ * regularly stop all unused threads e.g. from g_timeout_add().
+ **/
+EXPORT_C void
+g_thread_pool_stop_unused_threads (void)
+{
+ guint oldval;
+
+ oldval = g_thread_pool_get_max_unused_threads ();
+
+ g_thread_pool_set_max_unused_threads (0);
+ g_thread_pool_set_max_unused_threads (oldval);
+}
+
+/**
+ * g_thread_pool_set_sort_function:
+ * @pool: a #GThreadPool
+ * @func: the #GCompareDataFunc used to sort the list of tasks.
+ * This function is passed two tasks. It should return
+ * 0 if the order in which they are handled does not matter,
+ * a negative value if the first task should be processed before
+ * the second or a positive value if the second task should be
+ * processed first.
+ * @user_data: user data passed to @func.
+ *
+ * Sets the function used to sort the list of tasks. This allows the
+ * tasks to be processed by a priority determined by @func, and not
+ * just in the order in which they were added to the pool.
+ *
+ * Note, if the maximum number of threads is more than 1, the order
+ * that threads are executed can not be guranteed 100%. Threads are
+ * scheduled by the operating system and are executed at random. It
+ * cannot be assumed that threads are executed in the order they are
+ * created.
+ *
+ * Since: 2.10
+ **/
+EXPORT_C void
+g_thread_pool_set_sort_function (GThreadPool *pool,
+ GCompareDataFunc func,
+ gpointer user_data)
+{
+ GRealThreadPool *real;
+
+ real = (GRealThreadPool*) pool;
+
+ g_return_if_fail (real);
+ g_return_if_fail (real->running);
+
+ g_async_queue_lock (real->queue);
+
+ real->sort_func = func;
+ real->sort_user_data = user_data;
+
+ if (func)
+ g_async_queue_sort_unlocked (real->queue,
+ real->sort_func,
+ real->sort_user_data);
+
+ g_async_queue_unlock (real->queue);
+}
+
+/**
+ * g_thread_pool_set_max_idle_time:
+ * @interval: the maximum @interval (1/1000ths of a second) a thread
+ * can be idle.
+ *
+ * This function will set the maximum @interval that a thread waiting
+ * in the pool for new tasks can be idle for before being
+ * stopped. This function is similar to calling
+ * g_thread_pool_stop_unused_threads() on a regular timeout, except,
+ * this is done on a per thread basis.
+ *
+ * By setting @interval to 0, idle threads will not be stopped.
+ *
+ * This function makes use of g_async_queue_timed_pop () using
+ * @interval.
+ *
+ * Since: 2.10
+ **/
+EXPORT_C void
+g_thread_pool_set_max_idle_time (guint interval)
+{
+ guint i;
+
+ g_atomic_int_set (&max_idle_time, interval);
+
+ i = g_atomic_int_get (&unused_threads);
+ if (i > 0)
+ {
+ g_atomic_int_inc (&wakeup_thread_serial);
+ g_async_queue_lock (unused_thread_queue);
+
+ do
+ {
+ g_async_queue_push_unlocked (unused_thread_queue,
+ FIX_CASTING(void *)wakeup_thread_marker);
+ }
+ while (--i);
+
+ g_async_queue_unlock (unused_thread_queue);
+ }
+}
+
+/**
+ * g_thread_pool_get_max_idle_time:
+ *
+ * This function will return the maximum @interval that a thread will
+ * wait in the thread pool for new tasks before being stopped.
+ *
+ * If this function returns 0, threads waiting in the thread pool for
+ * new work are not stopped.
+ *
+ * Return value: the maximum @interval to wait for new tasks in the
+ * thread pool before stopping the thread (1/1000ths of a second).
+ *
+ * Since: 2.10
+ **/
+EXPORT_C guint
+g_thread_pool_get_max_idle_time (void)
+{
+ return g_atomic_int_get (&max_idle_time);
+}
+
+#define __G_THREADPOOL_C__
+#include "galiasdef.c"