author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 31 Aug 2010 15:30:33 +0300 | |
branch | RCL_3 |
changeset 29 | 567bb019e3e3 |
permissions | -rw-r--r-- |
29
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/* GStreamer |
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* Copyright (C) 2009 Wim Taymans <wim.taymans@gmail.com> |
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* |
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* gsttaskpool.c: Pool for streaming threads |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Library General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Library General Public License for more details. |
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* |
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* You should have received a copy of the GNU Library General Public |
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* License along with this library; if not, write to the |
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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* Boston, MA 02111-1307, USA. |
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*/ |
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|
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/** |
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* SECTION:gsttaskpool |
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* @short_description: Pool of GStreamer streaming threads |
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* @see_also: #GstTask, #GstPad |
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* |
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* This object provides an abstraction for creating threads. The default |
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* implementation uses a regular GThreadPool to start tasks. |
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* |
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* Subclasses can be made to create custom threads. |
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* |
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* Last reviewed on 2009-04-23 (0.10.24) |
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*/ |
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#include "gst_private.h" |
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#include "gstinfo.h" |
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#include "gsttaskpool.h" |
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#ifdef __SYMBIAN32__ |
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#include <glib_global.h> |
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#endif |
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GST_DEBUG_CATEGORY_STATIC (taskpool_debug); |
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#define GST_CAT_DEFAULT (taskpool_debug) |
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static void gst_task_pool_class_init (GstTaskPoolClass * klass); |
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static void gst_task_pool_init (GstTaskPool * pool); |
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static void gst_task_pool_finalize (GObject * object); |
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#define _do_init \ |
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{ \ |
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GST_DEBUG_CATEGORY_INIT (taskpool_debug, "taskpool", 0, "Thread pool"); \ |
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} |
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G_DEFINE_TYPE_WITH_CODE (GstTaskPool, gst_task_pool, GST_TYPE_OBJECT, _do_init); |
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typedef struct |
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{ |
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GstTaskPoolFunction func; |
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gpointer user_data; |
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} TaskData; |
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static void |
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default_func (TaskData * tdata, GstTaskPool * pool) |
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{ |
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GstTaskPoolFunction func; |
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gpointer user_data; |
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func = tdata->func; |
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user_data = tdata->user_data; |
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g_slice_free (TaskData, tdata); |
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func (user_data); |
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} |
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static void |
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default_prepare (GstTaskPool * pool, GError ** error) |
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{ |
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GST_OBJECT_LOCK (pool); |
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pool->pool = g_thread_pool_new ((GFunc) default_func, pool, -1, FALSE, NULL); |
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GST_OBJECT_UNLOCK (pool); |
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} |
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static void |
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default_cleanup (GstTaskPool * pool) |
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{ |
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GST_OBJECT_LOCK (pool); |
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if (pool->pool) { |
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/* Shut down all the threads, we still process the ones scheduled |
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* because the unref happens in the thread function. |
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* Also wait for currently running ones to finish. */ |
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g_thread_pool_free (pool->pool, FALSE, TRUE); |
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pool->pool = NULL; |
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} |
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GST_OBJECT_UNLOCK (pool); |
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} |
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static gpointer |
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default_push (GstTaskPool * pool, GstTaskPoolFunction func, |
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gpointer user_data, GError ** error) |
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{ |
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TaskData *tdata; |
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tdata = g_slice_new (TaskData); |
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tdata->func = func; |
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tdata->user_data = user_data; |
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107 |
|
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GST_OBJECT_LOCK (pool); |
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if (pool->pool) |
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g_thread_pool_push (pool->pool, tdata, error); |
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else { |
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g_slice_free (TaskData, tdata); |
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} |
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GST_OBJECT_UNLOCK (pool); |
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115 |
|
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return NULL; |
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} |
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118 |
|
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static void |
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default_join (GstTaskPool * pool, gpointer id) |
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121 |
{ |
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/* we do nothing here, we can't join from the pools */ |
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} |
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124 |
|
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static void |
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gst_task_pool_class_init (GstTaskPoolClass * klass) |
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{ |
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GObjectClass *gobject_class; |
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GstTaskPoolClass *gsttaskpool_class; |
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130 |
|
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gobject_class = (GObjectClass *) klass; |
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gsttaskpool_class = (GstTaskPoolClass *) klass; |
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133 |
|
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gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_task_pool_finalize); |
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135 |
|
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gsttaskpool_class->prepare = default_prepare; |
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gsttaskpool_class->cleanup = default_cleanup; |
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gsttaskpool_class->push = default_push; |
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gsttaskpool_class->join = default_join; |
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} |
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141 |
|
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static void |
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gst_task_pool_init (GstTaskPool * pool) |
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144 |
{ |
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} |
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146 |
|
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static void |
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gst_task_pool_finalize (GObject * object) |
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149 |
{ |
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GST_DEBUG ("taskpool %p finalize", object); |
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151 |
|
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G_OBJECT_CLASS (gst_task_pool_parent_class)->finalize (object); |
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} |
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154 |
|
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/** |
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* gst_task_pool_new: |
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* |
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* Create a new default task pool. The default task pool will use a regular |
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* GThreadPool for threads. |
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* |
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* Returns: a new #GstTaskPool. gst_object_unref() after usage. |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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166 |
|
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GstTaskPool * |
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gst_task_pool_new (void) |
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{ |
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GstTaskPool *pool; |
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171 |
|
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pool = g_object_new (GST_TYPE_TASK_POOL, NULL); |
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|
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return pool; |
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} |
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|
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/** |
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* gst_task_pool_prepare: |
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* @pool: a #GstTaskPool |
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* @error: an error return location |
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* |
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* Prepare the taskpool for accepting gst_task_pool_push() operations. |
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* |
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* MT safe. |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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189 |
|
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void |
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gst_task_pool_prepare (GstTaskPool * pool, GError ** error) |
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192 |
{ |
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GstTaskPoolClass *klass; |
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|
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g_return_if_fail (GST_IS_TASK_POOL (pool)); |
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|
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klass = GST_TASK_POOL_GET_CLASS (pool); |
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|
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if (klass->prepare) |
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klass->prepare (pool, error); |
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} |
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|
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/** |
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* gst_task_pool_cleanup: |
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* @pool: a #GstTaskPool |
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* |
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* Wait for all tasks to be stopped. This is mainly used internally |
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* to ensure proper cleanup of internal data structures in test suites. |
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* |
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* MT safe. |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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void |
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gst_task_pool_cleanup (GstTaskPool * pool) |
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{ |
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GstTaskPoolClass *klass; |
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g_return_if_fail (GST_IS_TASK_POOL (pool)); |
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klass = GST_TASK_POOL_GET_CLASS (pool); |
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|
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if (klass->cleanup) |
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klass->cleanup (pool); |
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} |
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|
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/** |
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* gst_task_pool_push: |
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* @pool: a #GstTaskPool |
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* @func: the function to call |
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* @user_data: data to pass to @func |
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* @error: return location for an error |
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* |
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* Start the execution of a new thread from @pool. |
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* |
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* Returns: a pointer that should be used for the gst_task_pool_join |
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* function. This pointer can be NULL, you must check @error to detect |
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* errors. |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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gpointer |
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gst_task_pool_push (GstTaskPool * pool, GstTaskPoolFunction func, |
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gpointer user_data, GError ** error) |
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{ |
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GstTaskPoolClass *klass; |
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g_return_val_if_fail (GST_IS_TASK_POOL (pool), NULL); |
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klass = GST_TASK_POOL_GET_CLASS (pool); |
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if (klass->push == NULL) |
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goto not_supported; |
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|
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return klass->push (pool, func, user_data, error); |
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|
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/* ERRORS */ |
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not_supported: |
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{ |
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g_warning ("pushing tasks on pool %p is not supported", pool); |
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return NULL; |
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} |
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} |
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|
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/** |
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* gst_task_pool_join: |
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* @pool: a #GstTaskPool |
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* @id: the id |
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* |
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* Join a task and/or return it to the pool. @id is the id obtained from |
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* gst_task_pool_push(). |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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|
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void |
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gst_task_pool_join (GstTaskPool * pool, gpointer id) |
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{ |
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GstTaskPoolClass *klass; |
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|
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g_return_if_fail (GST_IS_TASK_POOL (pool)); |
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|
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klass = GST_TASK_POOL_GET_CLASS (pool); |
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|
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if (klass->join) |
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klass->join (pool, id); |
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} |