diff -r 71e347f905f2 -r 4a7fac7dd34a gstreamer_core/gst/gsttaskpool.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/gstreamer_core/gst/gsttaskpool.c Fri Apr 16 15:15:52 2010 +0300 @@ -0,0 +1,292 @@ +/* GStreamer + * Copyright (C) 2009 Wim Taymans + * + * gsttaskpool.c: Pool for streaming threads + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +/** + * SECTION:gsttaskpool + * @short_description: Pool of GStreamer streaming threads + * @see_also: #GstTask, #GstPad + * + * This object provides an abstraction for creating threads. The default + * implementation uses a regular GThreadPool to start tasks. + * + * Subclasses can be made to create custom threads. + * + * Last reviewed on 2009-04-23 (0.10.24) + */ + +#include "gst_private.h" + +#include "gstinfo.h" +#include "gsttaskpool.h" +#ifdef __SYMBIAN32__ +#include +#endif + +GST_DEBUG_CATEGORY_STATIC (taskpool_debug); +#define GST_CAT_DEFAULT (taskpool_debug) + +static void gst_task_pool_class_init (GstTaskPoolClass * klass); +static void gst_task_pool_init (GstTaskPool * pool); +static void gst_task_pool_finalize (GObject * object); + +#define _do_init \ +{ \ + GST_DEBUG_CATEGORY_INIT (taskpool_debug, "taskpool", 0, "Thread pool"); \ +} + +G_DEFINE_TYPE_WITH_CODE (GstTaskPool, gst_task_pool, GST_TYPE_OBJECT, _do_init); + +typedef struct +{ + GstTaskPoolFunction func; + gpointer user_data; +} TaskData; + +static void +default_func (TaskData * tdata, GstTaskPool * pool) +{ + GstTaskPoolFunction func; + gpointer user_data; + + func = tdata->func; + user_data = tdata->user_data; + g_slice_free (TaskData, tdata); + + func (user_data); +} + +static void +default_prepare (GstTaskPool * pool, GError ** error) +{ + GST_OBJECT_LOCK (pool); + pool->pool = g_thread_pool_new ((GFunc) default_func, pool, -1, FALSE, NULL); + GST_OBJECT_UNLOCK (pool); +} + +static void +default_cleanup (GstTaskPool * pool) +{ + GST_OBJECT_LOCK (pool); + if (pool->pool) { + /* Shut down all the threads, we still process the ones scheduled + * because the unref happens in the thread function. + * Also wait for currently running ones to finish. */ + g_thread_pool_free (pool->pool, FALSE, TRUE); + pool->pool = NULL; + } + GST_OBJECT_UNLOCK (pool); +} + +static gpointer +default_push (GstTaskPool * pool, GstTaskPoolFunction func, + gpointer user_data, GError ** error) +{ + TaskData *tdata; + + tdata = g_slice_new (TaskData); + tdata->func = func; + tdata->user_data = user_data; + + GST_OBJECT_LOCK (pool); + if (pool->pool) + g_thread_pool_push (pool->pool, tdata, error); + else { + g_slice_free (TaskData, tdata); + } + GST_OBJECT_UNLOCK (pool); + + return NULL; +} + +static void +default_join (GstTaskPool * pool, gpointer id) +{ + /* we do nothing here, we can't join from the pools */ +} + +static void +gst_task_pool_class_init (GstTaskPoolClass * klass) +{ + GObjectClass *gobject_class; + GstTaskPoolClass *gsttaskpool_class; + + gobject_class = (GObjectClass *) klass; + gsttaskpool_class = (GstTaskPoolClass *) klass; + + gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_task_pool_finalize); + + gsttaskpool_class->prepare = default_prepare; + gsttaskpool_class->cleanup = default_cleanup; + gsttaskpool_class->push = default_push; + gsttaskpool_class->join = default_join; +} + +static void +gst_task_pool_init (GstTaskPool * pool) +{ +} + +static void +gst_task_pool_finalize (GObject * object) +{ + GST_DEBUG ("taskpool %p finalize", object); + + G_OBJECT_CLASS (gst_task_pool_parent_class)->finalize (object); +} + +/** + * gst_task_pool_new: + * + * Create a new default task pool. The default task pool will use a regular + * GThreadPool for threads. + * + * Returns: a new #GstTaskPool. gst_object_unref() after usage. + */ +#ifdef __SYMBIAN32__ +EXPORT_C +#endif + +GstTaskPool * +gst_task_pool_new (void) +{ + GstTaskPool *pool; + + pool = g_object_new (GST_TYPE_TASK_POOL, NULL); + + return pool; +} + +/** + * gst_task_pool_prepare: + * @pool: a #GstTaskPool + * @error: an error return location + * + * Prepare the taskpool for accepting gst_task_pool_push() operations. + * + * MT safe. + */ +#ifdef __SYMBIAN32__ +EXPORT_C +#endif + +void +gst_task_pool_prepare (GstTaskPool * pool, GError ** error) +{ + GstTaskPoolClass *klass; + + g_return_if_fail (GST_IS_TASK_POOL (pool)); + + klass = GST_TASK_POOL_GET_CLASS (pool); + + if (klass->prepare) + klass->prepare (pool, error); +} + +/** + * gst_task_pool_cleanup: + * @pool: a #GstTaskPool + * + * Wait for all tasks to be stopped. This is mainly used internally + * to ensure proper cleanup of internal data structures in test suites. + * + * MT safe. + */ +#ifdef __SYMBIAN32__ +EXPORT_C +#endif + +void +gst_task_pool_cleanup (GstTaskPool * pool) +{ + GstTaskPoolClass *klass; + + g_return_if_fail (GST_IS_TASK_POOL (pool)); + + klass = GST_TASK_POOL_GET_CLASS (pool); + + if (klass->cleanup) + klass->cleanup (pool); +} + +/** + * gst_task_pool_push: + * @pool: a #GstTaskPool + * @func: the function to call + * @user_data: data to pass to @func + * @error: return location for an error + * + * Start the execution of a new thread from @pool. + * + * Returns: a pointer that should be used for the gst_task_pool_join + * function. This pointer can be NULL, you must check @error to detect + * errors. + */ +#ifdef __SYMBIAN32__ +EXPORT_C +#endif + +gpointer +gst_task_pool_push (GstTaskPool * pool, GstTaskPoolFunction func, + gpointer user_data, GError ** error) +{ + GstTaskPoolClass *klass; + + g_return_val_if_fail (GST_IS_TASK_POOL (pool), NULL); + + klass = GST_TASK_POOL_GET_CLASS (pool); + + if (klass->push == NULL) + goto not_supported; + + return klass->push (pool, func, user_data, error); + + /* ERRORS */ +not_supported: + { + g_warning ("pushing tasks on pool %p is not supported", pool); + return NULL; + } +} + +/** + * gst_task_pool_join: + * @pool: a #GstTaskPool + * @id: the id + * + * Join a task and/or return it to the pool. @id is the id obtained from + * gst_task_pool_push(). + */ +#ifdef __SYMBIAN32__ +EXPORT_C +#endif + +void +gst_task_pool_join (GstTaskPool * pool, gpointer id) +{ + GstTaskPoolClass *klass; + + g_return_if_fail (GST_IS_TASK_POOL (pool)); + + klass = GST_TASK_POOL_GET_CLASS (pool); + + if (klass->join) + klass->join (pool, id); +}