gstreamer/gst/gsttaskpool.c

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/* GStreamer
* Copyright (C) 2009 Wim Taymans <wim.taymans@gmail.com>
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, 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"
GST_DEBUG_CATEGORY_STATIC (taskpool_debug);
#define GST_CAT_DEFAULT (taskpool_debug)
#ifndef GST_DISABLE_GST_DEBUG
static void gst_task_pool_finalize (GObject * object);
#endif
#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;
#ifndef GST_DISABLE_GST_DEBUG
gobject_class->finalize = gst_task_pool_finalize;
#endif
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)
{
/* clear floating flag */
gst_object_ref_sink (pool);
}
#ifndef GST_DISABLE_GST_DEBUG
static void
gst_task_pool_finalize (GObject * object)
{
GST_DEBUG ("taskpool %p finalize", object);
G_OBJECT_CLASS (gst_task_pool_parent_class)->finalize (object);
}
#endif
/**
* gst_task_pool_new:
*
* Create a new default task pool. The default task pool will use a regular
* GThreadPool for threads.
*
* Returns: (transfer full): a new #GstTaskPool. gst_object_unref() after usage.
*/
GstTaskPool *
gst_task_pool_new (void)
{
GstTaskPool *pool;
pool = g_object_newv (GST_TYPE_TASK_POOL, 0, 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.
*/
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.
*/
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: (scope async): the function to call
* @user_data: (closure): data to pass to @func
* @error: return location for an error
*
* Start the execution of a new thread from @pool.
*
* Returns: (transfer none): 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.
*/
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().
*/
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);
}