author | hgs |
Fri, 14 May 2010 18:43:44 -0500 | |
changeset 20 | 7e3786c5ed27 |
parent 16 | 8e837d1bf446 |
child 30 | 7e817e7e631c |
permissions | -rw-r--r-- |
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/* GStreamer |
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu> |
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* 2005 Wim Taymans <wim@fluendo.com> |
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* |
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* gsttask.c: Streaming tasks |
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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:gsttask |
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* @short_description: Abstraction of GStreamer streaming threads. |
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* @see_also: #GstElement, #GstPad |
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* |
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* #GstTask is used by #GstElement and #GstPad to provide the data passing |
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* threads in a #GstPipeline. |
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* |
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* A #GstPad will typically start a #GstTask to push or pull data to/from the |
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* peer pads. Most source elements start a #GstTask to push data. In some cases |
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* a demuxer element can start a #GstTask to pull data from a peer element. This |
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* is typically done when the demuxer can perform random access on the upstream |
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* peer element for improved performance. |
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* |
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* Although convenience functions exist on #GstPad to start/pause/stop tasks, it |
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* might sometimes be needed to create a #GstTask manually if it is not related to |
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* a #GstPad. |
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* |
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* Before the #GstTask can be run, it needs a #GStaticRecMutex that can be set with |
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* gst_task_set_lock(). |
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* |
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* The task can be started, paused and stopped with gst_task_start(), gst_task_pause() |
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* and gst_task_stop() respectively or with the gst_task_set_state() function. |
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* |
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* A #GstTask will repeatedly call the #GstTaskFunction with the user data |
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* that was provided when creating the task with gst_task_create(). While calling |
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* the function it will acquire the provided lock. The provided lock is released |
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* when the task pauses or stops. |
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* |
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* Stopping a task with gst_task_stop() will not immediately make sure the task is |
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* not running anymore. Use gst_task_join() to make sure the task is completely |
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* stopped and the thread is stopped. |
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* |
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* After creating a #GstTask, use gst_object_unref() to free its resources. This can |
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* only be done it the task is not running anymore. |
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* |
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* Last reviewed on 2006-02-13 (0.10.4) |
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*/ |
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#include "gst_private.h" |
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#include "gstinfo.h" |
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#include "gsttask.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 (task_debug); |
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#define GST_CAT_DEFAULT (task_debug) |
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#define GST_TASK_GET_PRIVATE(obj) \ |
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(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_TASK, GstTaskPrivate)) |
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struct _GstTaskPrivate |
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{ |
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/* callbacks for managing the thread of this task */ |
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GstTaskThreadCallbacks thr_callbacks; |
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gpointer thr_user_data; |
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GDestroyNotify thr_notify; |
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gboolean prio_set; |
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GThreadPriority priority; |
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/* configured pool */ |
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GstTaskPool *pool; |
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/* remember the pool and id that is currently running. */ |
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gpointer id; |
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GstTaskPool *pool_id; |
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}; |
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static void gst_task_class_init (GstTaskClass * klass); |
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static void gst_task_init (GstTask * task); |
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static void gst_task_finalize (GObject * object); |
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static void gst_task_func (GstTask * task); |
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static GStaticMutex pool_lock = G_STATIC_MUTEX_INIT; |
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#define _do_init \ |
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{ \ |
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GST_DEBUG_CATEGORY_INIT (task_debug, "task", 0, "Processing tasks"); \ |
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} |
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G_DEFINE_TYPE_WITH_CODE (GstTask, gst_task, GST_TYPE_OBJECT, _do_init); |
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static void |
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init_klass_pool (GstTaskClass * klass) |
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{ |
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g_static_mutex_lock (&pool_lock); |
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if (klass->pool) { |
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gst_task_pool_cleanup (klass->pool); |
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gst_object_unref (klass->pool); |
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} |
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klass->pool = gst_task_pool_new (); |
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gst_task_pool_prepare (klass->pool, NULL); |
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g_static_mutex_unlock (&pool_lock); |
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} |
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static void |
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gst_task_class_init (GstTaskClass * klass) |
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{ |
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GObjectClass *gobject_class; |
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gobject_class = (GObjectClass *) klass; |
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g_type_class_add_private (klass, sizeof (GstTaskPrivate)); |
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gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_task_finalize); |
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init_klass_pool (klass); |
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} |
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static void |
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|
138 |
gst_task_init (GstTask * task) |
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139 |
{ |
16 | 140 |
GstTaskClass *klass; |
141 |
||
142 |
klass = GST_TASK_GET_CLASS (task); |
|
143 |
||
144 |
task->priv = GST_TASK_GET_PRIVATE (task); |
|
0
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145 |
task->running = FALSE; |
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146 |
task->abidata.ABI.thread = NULL; |
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147 |
task->lock = NULL; |
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148 |
task->cond = g_cond_new (); |
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|
149 |
task->state = GST_TASK_STOPPED; |
16 | 150 |
task->priv->prio_set = FALSE; |
151 |
||
152 |
/* use the default klass pool for this task, users can |
|
153 |
* override this later */ |
|
154 |
g_static_mutex_lock (&pool_lock); |
|
155 |
task->priv->pool = gst_object_ref (klass->pool); |
|
156 |
g_static_mutex_unlock (&pool_lock); |
|
0
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157 |
} |
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|
158 |
|
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159 |
static void |
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160 |
gst_task_finalize (GObject * object) |
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161 |
{ |
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|
162 |
GstTask *task = GST_TASK (object); |
16 | 163 |
GstTaskPrivate *priv = task->priv; |
0
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164 |
|
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165 |
GST_DEBUG ("task %p finalize", task); |
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|
166 |
|
16 | 167 |
if (priv->thr_notify) |
168 |
priv->thr_notify (priv->thr_user_data); |
|
169 |
priv->thr_notify = NULL; |
|
170 |
priv->thr_user_data = NULL; |
|
171 |
||
172 |
gst_object_unref (priv->pool); |
|
173 |
||
0
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|
174 |
/* task thread cannot be running here since it holds a ref |
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175 |
* to the task so that the finalize could not have happened */ |
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176 |
g_cond_free (task->cond); |
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177 |
task->cond = NULL; |
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178 |
|
16 | 179 |
G_OBJECT_CLASS (gst_task_parent_class)->finalize (object); |
0
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180 |
} |
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181 |
|
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182 |
static void |
16 | 183 |
gst_task_func (GstTask * task) |
0
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184 |
{ |
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185 |
GStaticRecMutex *lock; |
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|
186 |
GThread *tself; |
16 | 187 |
GstTaskPrivate *priv; |
188 |
||
189 |
priv = task->priv; |
|
0
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190 |
|
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|
191 |
tself = g_thread_self (); |
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|
192 |
|
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193 |
GST_DEBUG ("Entering task %p, thread %p", task, tself); |
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|
194 |
|
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|
195 |
/* we have to grab the lock to get the mutex. We also |
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|
196 |
* mark our state running so that nobody can mess with |
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197 |
* the mutex. */ |
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|
198 |
GST_OBJECT_LOCK (task); |
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|
199 |
if (task->state == GST_TASK_STOPPED) |
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|
200 |
goto exit; |
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|
201 |
lock = GST_TASK_GET_LOCK (task); |
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|
202 |
if (G_UNLIKELY (lock == NULL)) |
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|
203 |
goto no_lock; |
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|
204 |
task->abidata.ABI.thread = tself; |
16 | 205 |
/* only update the priority when it was changed */ |
206 |
if (priv->prio_set) |
|
207 |
g_thread_set_priority (tself, priv->priority); |
|
0
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|
208 |
GST_OBJECT_UNLOCK (task); |
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|
209 |
|
16 | 210 |
/* fire the enter_thread callback when we need to */ |
211 |
if (priv->thr_callbacks.enter_thread) |
|
212 |
priv->thr_callbacks.enter_thread (task, tself, priv->thr_user_data); |
|
213 |
||
0
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|
214 |
/* locking order is TASK_LOCK, LOCK */ |
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|
215 |
g_static_rec_mutex_lock (lock); |
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|
216 |
GST_OBJECT_LOCK (task); |
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|
217 |
while (G_LIKELY (task->state != GST_TASK_STOPPED)) { |
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|
218 |
while (G_UNLIKELY (task->state == GST_TASK_PAUSED)) { |
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|
219 |
gint t; |
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|
220 |
|
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|
221 |
t = g_static_rec_mutex_unlock_full (lock); |
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|
222 |
if (t <= 0) { |
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|
223 |
g_warning ("wrong STREAM_LOCK count %d", t); |
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|
224 |
} |
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|
225 |
GST_TASK_SIGNAL (task); |
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|
226 |
GST_TASK_WAIT (task); |
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|
227 |
GST_OBJECT_UNLOCK (task); |
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|
228 |
/* locking order.. */ |
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|
229 |
if (t > 0) |
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|
230 |
g_static_rec_mutex_lock_full (lock, t); |
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|
231 |
|
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|
232 |
GST_OBJECT_LOCK (task); |
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|
233 |
if (G_UNLIKELY (task->state == GST_TASK_STOPPED)) |
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|
234 |
goto done; |
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|
235 |
} |
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|
236 |
GST_OBJECT_UNLOCK (task); |
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|
237 |
|
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|
238 |
task->func (task->data); |
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|
239 |
|
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|
240 |
GST_OBJECT_LOCK (task); |
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|
241 |
} |
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|
242 |
done: |
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|
243 |
GST_OBJECT_UNLOCK (task); |
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|
244 |
g_static_rec_mutex_unlock (lock); |
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|
245 |
|
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|
246 |
GST_OBJECT_LOCK (task); |
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|
247 |
task->abidata.ABI.thread = NULL; |
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|
248 |
|
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|
249 |
exit: |
16 | 250 |
if (priv->thr_callbacks.leave_thread) { |
251 |
/* fire the leave_thread callback when we need to. We need to do this before |
|
252 |
* we signal the task and with the task lock released. */ |
|
253 |
GST_OBJECT_UNLOCK (task); |
|
254 |
priv->thr_callbacks.leave_thread (task, tself, priv->thr_user_data); |
|
255 |
GST_OBJECT_LOCK (task); |
|
256 |
} else { |
|
257 |
/* restore normal priority when releasing back into the pool, we will not |
|
258 |
* touch the priority when a custom callback has been installed. */ |
|
259 |
g_thread_set_priority (tself, G_THREAD_PRIORITY_NORMAL); |
|
260 |
} |
|
0
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|
261 |
/* now we allow messing with the lock again by setting the running flag to |
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|
262 |
* FALSE. Together with the SIGNAL this is the sign for the _join() to |
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|
263 |
* complete. |
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|
264 |
* Note that we still have not dropped the final ref on the task. We could |
0e761a78d257
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|
265 |
* check here if there is a pending join() going on and drop the last ref |
0e761a78d257
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|
266 |
* before releasing the lock as we can be sure that a ref is held by the |
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|
267 |
* caller of the join(). */ |
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|
268 |
task->running = FALSE; |
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|
269 |
GST_TASK_SIGNAL (task); |
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|
270 |
GST_OBJECT_UNLOCK (task); |
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|
271 |
|
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|
272 |
GST_DEBUG ("Exit task %p, thread %p", task, g_thread_self ()); |
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|
273 |
|
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diff
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|
274 |
gst_object_unref (task); |
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275 |
return; |
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|
276 |
|
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|
277 |
no_lock: |
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|
278 |
{ |
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|
279 |
g_warning ("starting task without a lock"); |
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|
280 |
goto exit; |
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|
281 |
} |
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|
282 |
} |
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|
283 |
|
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|
284 |
/** |
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|
285 |
* gst_task_cleanup_all: |
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|
286 |
* |
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|
287 |
* Wait for all tasks to be stopped. This is mainly used internally |
16 | 288 |
* to ensure proper cleanup of internal data structures in test suites. |
0
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|
289 |
* |
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|
290 |
* MT safe. |
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|
291 |
*/ |
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|
292 |
#ifdef __SYMBIAN32__ |
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|
293 |
EXPORT_C |
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|
294 |
#endif |
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|
295 |
|
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|
296 |
void |
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|
297 |
gst_task_cleanup_all (void) |
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|
298 |
{ |
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|
299 |
GstTaskClass *klass; |
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|
300 |
|
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|
301 |
if ((klass = g_type_class_peek (GST_TYPE_TASK))) { |
16 | 302 |
init_klass_pool (klass); |
0
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|
303 |
} |
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|
304 |
} |
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|
305 |
|
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|
306 |
/** |
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|
307 |
* gst_task_create: |
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|
308 |
* @func: The #GstTaskFunction to use |
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|
309 |
* @data: User data to pass to @func |
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|
310 |
* |
16 | 311 |
* Create a new Task that will repeatedly call the provided @func |
0
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|
312 |
* with @data as a parameter. Typically the task will run in |
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|
313 |
* a new thread. |
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|
314 |
* |
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|
315 |
* The function cannot be changed after the task has been created. You |
16 | 316 |
* must create a new #GstTask to change the function. |
317 |
* |
|
318 |
* This function will not yet create and start a thread. Use gst_task_start() or |
|
319 |
* gst_task_pause() to create and start the GThread. |
|
320 |
* |
|
321 |
* Before the task can be used, a #GStaticRecMutex must be configured using the |
|
322 |
* gst_task_set_lock() function. This lock will always be acquired while |
|
323 |
* @func is called. |
|
0
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|
324 |
* |
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|
325 |
* Returns: A new #GstTask. |
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|
326 |
* |
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|
327 |
* MT safe. |
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|
328 |
*/ |
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|
329 |
#ifdef __SYMBIAN32__ |
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|
330 |
EXPORT_C |
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|
331 |
#endif |
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|
332 |
|
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|
333 |
GstTask * |
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|
334 |
gst_task_create (GstTaskFunction func, gpointer data) |
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|
335 |
{ |
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|
336 |
GstTask *task; |
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|
337 |
|
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|
338 |
task = g_object_new (GST_TYPE_TASK, NULL); |
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|
339 |
task->func = func; |
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|
340 |
task->data = data; |
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|
341 |
|
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|
342 |
GST_DEBUG ("Created task %p", task); |
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|
343 |
|
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|
344 |
return task; |
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|
345 |
} |
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|
346 |
|
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|
347 |
/** |
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|
348 |
* gst_task_set_lock: |
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|
349 |
* @task: The #GstTask to use |
16 | 350 |
* @mutex: The #GMutex to use |
0
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|
351 |
* |
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|
352 |
* Set the mutex used by the task. The mutex will be acquired before |
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|
353 |
* calling the #GstTaskFunction. |
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|
354 |
* |
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|
355 |
* This function has to be called before calling gst_task_pause() or |
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|
356 |
* gst_task_start(). |
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|
357 |
* |
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|
358 |
* MT safe. |
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|
359 |
*/ |
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changeset
|
360 |
#ifdef __SYMBIAN32__ |
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|
361 |
EXPORT_C |
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|
362 |
#endif |
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|
363 |
|
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|
364 |
void |
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|
365 |
gst_task_set_lock (GstTask * task, GStaticRecMutex * mutex) |
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|
366 |
{ |
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|
367 |
GST_OBJECT_LOCK (task); |
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|
368 |
if (G_UNLIKELY (task->running)) |
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|
369 |
goto is_running; |
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|
370 |
GST_TASK_GET_LOCK (task) = mutex; |
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|
371 |
GST_OBJECT_UNLOCK (task); |
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changeset
|
372 |
|
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|
373 |
return; |
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changeset
|
374 |
|
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|
375 |
/* ERRORS */ |
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|
376 |
is_running: |
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changeset
|
377 |
{ |
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Revision: 200949
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|
378 |
GST_OBJECT_UNLOCK (task); |
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|
379 |
g_warning ("cannot call set_lock on a running task"); |
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|
380 |
} |
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Revision: 200949
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changeset
|
381 |
} |
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Revision: 200949
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parents:
diff
changeset
|
382 |
|
16 | 383 |
/** |
384 |
* gst_task_set_priority: |
|
385 |
* @task: a #GstTask |
|
386 |
* @priority: a new priority for @task |
|
387 |
* |
|
388 |
* Changes the priority of @task to @priority. |
|
389 |
* |
|
390 |
* Note: try not to depend on task priorities. |
|
391 |
* |
|
392 |
* MT safe. |
|
393 |
* |
|
394 |
* Since: 0.10.24 |
|
395 |
*/ |
|
396 |
#ifdef __SYMBIAN32__ |
|
397 |
EXPORT_C |
|
398 |
#endif |
|
399 |
||
400 |
void |
|
401 |
gst_task_set_priority (GstTask * task, GThreadPriority priority) |
|
402 |
{ |
|
403 |
GstTaskPrivate *priv; |
|
404 |
GThread *thread; |
|
405 |
||
406 |
g_return_if_fail (GST_IS_TASK (task)); |
|
407 |
||
408 |
priv = task->priv; |
|
409 |
||
410 |
GST_OBJECT_LOCK (task); |
|
411 |
priv->prio_set = TRUE; |
|
412 |
priv->priority = priority; |
|
413 |
thread = task->abidata.ABI.thread; |
|
414 |
if (thread != NULL) { |
|
415 |
/* if this task already has a thread, we can configure the priority right |
|
416 |
* away, else we do that when we assign a thread to the task. */ |
|
417 |
g_thread_set_priority (thread, priority); |
|
418 |
} |
|
419 |
GST_OBJECT_UNLOCK (task); |
|
420 |
} |
|
421 |
||
422 |
/** |
|
423 |
* gst_task_get_pool: |
|
424 |
* @task: a #GstTask |
|
425 |
* |
|
426 |
* Get the #GstTaskPool that this task will use for its streaming |
|
427 |
* threads. |
|
428 |
* |
|
429 |
* MT safe. |
|
430 |
* |
|
431 |
* Returns: the #GstTaskPool used by @task. gst_object_unref() |
|
432 |
* after usage. |
|
433 |
* |
|
434 |
* Since: 0.10.24 |
|
435 |
*/ |
|
436 |
#ifdef __SYMBIAN32__ |
|
437 |
EXPORT_C |
|
438 |
#endif |
|
439 |
||
440 |
GstTaskPool * |
|
441 |
gst_task_get_pool (GstTask * task) |
|
442 |
{ |
|
443 |
GstTaskPool *result; |
|
444 |
GstTaskPrivate *priv; |
|
445 |
||
446 |
g_return_val_if_fail (GST_IS_TASK (task), NULL); |
|
447 |
||
448 |
priv = task->priv; |
|
449 |
||
450 |
GST_OBJECT_LOCK (task); |
|
451 |
result = gst_object_ref (priv->pool); |
|
452 |
GST_OBJECT_UNLOCK (task); |
|
453 |
||
454 |
return result; |
|
455 |
} |
|
456 |
||
457 |
/** |
|
458 |
* gst_task_set_pool: |
|
459 |
* @task: a #GstTask |
|
460 |
* @pool: a #GstTaskPool |
|
461 |
* |
|
462 |
* Set @pool as the new GstTaskPool for @task. Any new streaming threads that |
|
463 |
* will be created by @task will now use @pool. |
|
464 |
* |
|
465 |
* MT safe. |
|
466 |
* |
|
467 |
* Since: 0.10.24 |
|
468 |
*/ |
|
469 |
#ifdef __SYMBIAN32__ |
|
470 |
EXPORT_C |
|
471 |
#endif |
|
472 |
||
473 |
void |
|
474 |
gst_task_set_pool (GstTask * task, GstTaskPool * pool) |
|
475 |
{ |
|
476 |
GstTaskPool *old; |
|
477 |
GstTaskPrivate *priv; |
|
478 |
||
479 |
g_return_if_fail (GST_IS_TASK (task)); |
|
480 |
g_return_if_fail (GST_IS_TASK_POOL (pool)); |
|
481 |
||
482 |
priv = task->priv; |
|
483 |
||
484 |
GST_OBJECT_LOCK (task); |
|
485 |
if (priv->pool != pool) { |
|
486 |
old = priv->pool; |
|
487 |
priv->pool = gst_object_ref (pool); |
|
488 |
} else |
|
489 |
old = NULL; |
|
490 |
GST_OBJECT_UNLOCK (task); |
|
491 |
||
492 |
if (old) |
|
493 |
gst_object_unref (old); |
|
494 |
} |
|
495 |
||
496 |
||
497 |
/** |
|
498 |
* gst_task_set_thread_callbacks: |
|
499 |
* @task: The #GstTask to use |
|
500 |
* @callbacks: a #GstTaskThreadCallbacks pointer |
|
501 |
* @user_data: user data passed to the callbacks |
|
502 |
* @notify: called when @user_data is no longer referenced |
|
503 |
* |
|
504 |
* Set callbacks which will be executed when a new thread is needed, the thread |
|
505 |
* function is entered and left and when the thread is joined. |
|
506 |
* |
|
507 |
* By default a thread for @task will be created from a default thread pool. |
|
508 |
* |
|
509 |
* Objects can use custom GThreads or can perform additional configuration of |
|
510 |
* the threads (such as changing the thread priority) by installing callbacks. |
|
511 |
* |
|
512 |
* MT safe. |
|
513 |
* |
|
514 |
* Since: 0.10.24 |
|
515 |
*/ |
|
516 |
#ifdef __SYMBIAN32__ |
|
517 |
EXPORT_C |
|
518 |
#endif |
|
519 |
||
520 |
void |
|
521 |
gst_task_set_thread_callbacks (GstTask * task, |
|
522 |
GstTaskThreadCallbacks * callbacks, gpointer user_data, |
|
523 |
GDestroyNotify notify) |
|
524 |
{ |
|
525 |
GDestroyNotify old_notify; |
|
526 |
||
527 |
g_return_if_fail (task != NULL); |
|
528 |
g_return_if_fail (GST_IS_TASK (task)); |
|
529 |
g_return_if_fail (callbacks != NULL); |
|
530 |
||
531 |
GST_OBJECT_LOCK (task); |
|
532 |
old_notify = task->priv->thr_notify; |
|
533 |
||
534 |
if (old_notify) { |
|
535 |
gpointer old_data; |
|
536 |
||
537 |
old_data = task->priv->thr_user_data; |
|
538 |
||
539 |
task->priv->thr_user_data = NULL; |
|
540 |
task->priv->thr_notify = NULL; |
|
541 |
GST_OBJECT_UNLOCK (task); |
|
542 |
||
543 |
old_notify (old_data); |
|
544 |
||
545 |
GST_OBJECT_LOCK (task); |
|
546 |
} |
|
547 |
task->priv->thr_callbacks = *callbacks; |
|
548 |
task->priv->thr_user_data = user_data; |
|
549 |
task->priv->thr_notify = notify; |
|
550 |
GST_OBJECT_UNLOCK (task); |
|
551 |
} |
|
0
0e761a78d257
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parents:
diff
changeset
|
552 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
553 |
/** |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
554 |
* gst_task_get_state: |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
555 |
* @task: The #GstTask to query |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
556 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
557 |
* Get the current state of the task. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
558 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
559 |
* Returns: The #GstTaskState of the task |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
560 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
561 |
* MT safe. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
562 |
*/ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
563 |
#ifdef __SYMBIAN32__ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
564 |
EXPORT_C |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
565 |
#endif |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
566 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
567 |
GstTaskState |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
568 |
gst_task_get_state (GstTask * task) |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
569 |
{ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
570 |
GstTaskState result; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
571 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
572 |
g_return_val_if_fail (GST_IS_TASK (task), GST_TASK_STOPPED); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
573 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
574 |
GST_OBJECT_LOCK (task); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
575 |
result = task->state; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
576 |
GST_OBJECT_UNLOCK (task); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
577 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
578 |
return result; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
579 |
} |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
580 |
|
16 | 581 |
/* make sure the task is running and start a thread if it's not. |
582 |
* This function must be called with the task LOCK. */ |
|
583 |
static gboolean |
|
584 |
start_task (GstTask * task) |
|
585 |
{ |
|
586 |
gboolean res = TRUE; |
|
587 |
GstTaskClass *tclass; |
|
588 |
GError *error = NULL; |
|
589 |
GstTaskPrivate *priv; |
|
590 |
||
591 |
priv = task->priv; |
|
592 |
||
593 |
/* new task, We ref before so that it remains alive while |
|
594 |
* the thread is running. */ |
|
595 |
gst_object_ref (task); |
|
596 |
/* mark task as running so that a join will wait until we schedule |
|
597 |
* and exit the task function. */ |
|
598 |
task->running = TRUE; |
|
599 |
||
600 |
tclass = GST_TASK_GET_CLASS (task); |
|
601 |
||
602 |
/* push on the thread pool, we remember the original pool because the user |
|
603 |
* could change it later on and then we join to the wrong pool. */ |
|
604 |
priv->pool_id = gst_object_ref (priv->pool); |
|
605 |
priv->id = |
|
606 |
gst_task_pool_push (priv->pool_id, (GstTaskPoolFunction) gst_task_func, |
|
607 |
task, &error); |
|
608 |
||
609 |
if (error != NULL) { |
|
610 |
g_warning ("failed to create thread: %s", error->message); |
|
611 |
g_error_free (error); |
|
612 |
res = FALSE; |
|
613 |
} |
|
614 |
return res; |
|
615 |
} |
|
616 |
||
617 |
||
618 |
/** |
|
619 |
* gst_task_set_state: |
|
620 |
* @task: a #GstTask |
|
621 |
* @state: the new task state |
|
622 |
* |
|
623 |
* Sets the state of @task to @state. |
|
624 |
* |
|
625 |
* The @task must have a lock associated with it using |
|
626 |
* gst_task_set_lock() when going to GST_TASK_STARTED or GST_TASK_PAUSED or |
|
627 |
* this function will return %FALSE. |
|
628 |
* |
|
629 |
* MT safe. |
|
630 |
* |
|
631 |
* Returns: %TRUE if the state could be changed. |
|
632 |
* |
|
633 |
* Since: 0.10.24 |
|
634 |
*/ |
|
635 |
#ifdef __SYMBIAN32__ |
|
636 |
EXPORT_C |
|
637 |
#endif |
|
638 |
||
639 |
gboolean |
|
640 |
gst_task_set_state (GstTask * task, GstTaskState state) |
|
641 |
{ |
|
642 |
GstTaskState old; |
|
643 |
gboolean res = TRUE; |
|
644 |
||
645 |
g_return_val_if_fail (GST_IS_TASK (task), FALSE); |
|
646 |
||
647 |
GST_DEBUG_OBJECT (task, "Changing task %p to state %d", task, state); |
|
648 |
||
649 |
GST_OBJECT_LOCK (task); |
|
650 |
if (state != GST_TASK_STOPPED) |
|
651 |
if (G_UNLIKELY (GST_TASK_GET_LOCK (task) == NULL)) |
|
652 |
goto no_lock; |
|
653 |
||
654 |
/* if the state changed, do our thing */ |
|
655 |
old = task->state; |
|
656 |
if (old != state) { |
|
657 |
task->state = state; |
|
658 |
switch (old) { |
|
659 |
case GST_TASK_STOPPED: |
|
660 |
/* If the task already has a thread scheduled we don't have to do |
|
661 |
* anything. */ |
|
662 |
if (G_UNLIKELY (!task->running)) |
|
663 |
res = start_task (task); |
|
664 |
break; |
|
665 |
case GST_TASK_PAUSED: |
|
666 |
/* when we are paused, signal to go to the new state */ |
|
667 |
GST_TASK_SIGNAL (task); |
|
668 |
break; |
|
669 |
case GST_TASK_STARTED: |
|
670 |
/* if we were started, we'll go to the new state after the next |
|
671 |
* iteration. */ |
|
672 |
break; |
|
673 |
} |
|
674 |
} |
|
675 |
GST_OBJECT_UNLOCK (task); |
|
676 |
||
677 |
return res; |
|
678 |
||
679 |
/* ERRORS */ |
|
680 |
no_lock: |
|
681 |
{ |
|
682 |
GST_WARNING_OBJECT (task, "state %d set on task without a lock", state); |
|
683 |
GST_OBJECT_UNLOCK (task); |
|
684 |
g_warning ("task without a lock can't be set to state %d", state); |
|
685 |
return FALSE; |
|
686 |
} |
|
687 |
} |
|
688 |
||
0
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
689 |
/** |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
690 |
* gst_task_start: |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
691 |
* @task: The #GstTask to start |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
692 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
693 |
* Starts @task. The @task must have a lock associated with it using |
16 | 694 |
* gst_task_set_lock() or this function will return %FALSE. |
0
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
695 |
* |
16 | 696 |
* Returns: %TRUE if the task could be started. |
0
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
697 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
698 |
* MT safe. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
699 |
*/ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
700 |
#ifdef __SYMBIAN32__ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
701 |
EXPORT_C |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
702 |
#endif |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
703 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
704 |
gboolean |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
705 |
gst_task_start (GstTask * task) |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
706 |
{ |
16 | 707 |
return gst_task_set_state (task, GST_TASK_STARTED); |
0
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
708 |
} |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
709 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
710 |
/** |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
711 |
* gst_task_stop: |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
712 |
* @task: The #GstTask to stop |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
713 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
714 |
* Stops @task. This method merely schedules the task to stop and |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
715 |
* will not wait for the task to have completely stopped. Use |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
716 |
* gst_task_join() to stop and wait for completion. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
717 |
* |
16 | 718 |
* Returns: %TRUE if the task could be stopped. |
0
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
719 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
720 |
* MT safe. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
721 |
*/ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
722 |
#ifdef __SYMBIAN32__ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
723 |
EXPORT_C |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
724 |
#endif |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
725 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
726 |
gboolean |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
727 |
gst_task_stop (GstTask * task) |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
728 |
{ |
16 | 729 |
return gst_task_set_state (task, GST_TASK_STOPPED); |
0
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
730 |
} |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
731 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
732 |
/** |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
733 |
* gst_task_pause: |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
734 |
* @task: The #GstTask to pause |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
735 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
736 |
* Pauses @task. This method can also be called on a task in the |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
737 |
* stopped state, in which case a thread will be started and will remain |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
738 |
* in the paused state. This function does not wait for the task to complete |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
739 |
* the paused state. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
740 |
* |
16 | 741 |
* Returns: %TRUE if the task could be paused. |
0
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
742 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
743 |
* MT safe. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
744 |
*/ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
745 |
#ifdef __SYMBIAN32__ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
746 |
EXPORT_C |
16 | 747 |
#endif |
0
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
748 |
gboolean |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
749 |
gst_task_pause (GstTask * task) |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
750 |
{ |
16 | 751 |
return gst_task_set_state (task, GST_TASK_PAUSED); |
0
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
752 |
} |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
753 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
754 |
/** |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
755 |
* gst_task_join: |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
756 |
* @task: The #GstTask to join |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
757 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
758 |
* Joins @task. After this call, it is safe to unref the task |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
759 |
* and clean up the lock set with gst_task_set_lock(). |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
760 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
761 |
* The task will automatically be stopped with this call. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
762 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
763 |
* This function cannot be called from within a task function as this |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
764 |
* would cause a deadlock. The function will detect this and print a |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
765 |
* g_warning. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
766 |
* |
16 | 767 |
* Returns: %TRUE if the task could be joined. |
0
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
768 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
769 |
* MT safe. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
770 |
*/ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
771 |
#ifdef __SYMBIAN32__ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
772 |
EXPORT_C |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
773 |
#endif |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
774 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
775 |
gboolean |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
776 |
gst_task_join (GstTask * task) |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
777 |
{ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
778 |
GThread *tself; |
16 | 779 |
GstTaskPrivate *priv; |
780 |
gpointer id; |
|
781 |
GstTaskPool *pool = NULL; |
|
782 |
||
783 |
priv = task->priv; |
|
0
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
784 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
785 |
g_return_val_if_fail (GST_IS_TASK (task), FALSE); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
786 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
787 |
tself = g_thread_self (); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
788 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
789 |
GST_DEBUG_OBJECT (task, "Joining task %p, thread %p", task, tself); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
790 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
791 |
/* we don't use a real thread join here because we are using |
16 | 792 |
* thread pools */ |
0
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
793 |
GST_OBJECT_LOCK (task); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
794 |
if (G_UNLIKELY (tself == task->abidata.ABI.thread)) |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
795 |
goto joining_self; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
796 |
task->state = GST_TASK_STOPPED; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
797 |
/* signal the state change for when it was blocked in PAUSED. */ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
798 |
GST_TASK_SIGNAL (task); |
16 | 799 |
/* we set the running flag when pushing the task on the thread pool. |
0
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
800 |
* This means that the task function might not be called when we try |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
801 |
* to join it here. */ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
802 |
while (G_LIKELY (task->running)) |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
803 |
GST_TASK_WAIT (task); |
16 | 804 |
/* clean the thread */ |
805 |
task->abidata.ABI.thread = NULL; |
|
806 |
/* get the id and pool to join */ |
|
807 |
pool = priv->pool_id; |
|
808 |
id = priv->id; |
|
809 |
priv->pool_id = NULL; |
|
810 |
priv->id = NULL; |
|
0
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
811 |
GST_OBJECT_UNLOCK (task); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
812 |
|
16 | 813 |
if (pool) { |
814 |
if (id) |
|
815 |
gst_task_pool_join (pool, id); |
|
816 |
gst_object_unref (pool); |
|
817 |
} |
|
818 |
||
0
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
819 |
GST_DEBUG_OBJECT (task, "Joined task %p", task); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
820 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
821 |
return TRUE; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
822 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
823 |
/* ERRORS */ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
824 |
joining_self: |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
825 |
{ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
826 |
GST_WARNING_OBJECT (task, "trying to join task from its thread"); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
827 |
GST_OBJECT_UNLOCK (task); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
828 |
g_warning ("\nTrying to join task %p from its thread would deadlock.\n" |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
829 |
"You cannot change the state of an element from its streaming\n" |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
830 |
"thread. Use g_idle_add() or post a GstMessage on the bus to\n" |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
831 |
"schedule the state change from the main thread.\n", task); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
832 |
return FALSE; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
833 |
} |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
834 |
} |