2 * Copyright (C) 2009 Wim Taymans <wim.taymans@gmail.com>
4 * gsttaskpool.c: Pool for streaming threads
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
24 * @short_description: Pool of GStreamer streaming threads
25 * @see_also: #GstTask, #GstPad
27 * This object provides an abstraction for creating threads. The default
28 * implementation uses a regular GThreadPool to start tasks.
30 * Subclasses can be made to create custom threads.
32 * Last reviewed on 2009-04-23 (0.10.24)
35 #include "gst_private.h"
38 #include "gsttaskpool.h"
40 GST_DEBUG_CATEGORY_STATIC (taskpool_debug);
41 #define GST_CAT_DEFAULT (taskpool_debug)
43 static void gst_task_pool_class_init (GstTaskPoolClass * klass);
44 static void gst_task_pool_init (GstTaskPool * pool);
45 static void gst_task_pool_finalize (GObject * object);
49 GST_DEBUG_CATEGORY_INIT (taskpool_debug, "taskpool", 0, "Thread pool"); \
52 G_DEFINE_TYPE_WITH_CODE (GstTaskPool, gst_task_pool, GST_TYPE_OBJECT, _do_init);
56 GstTaskPoolFunction func;
61 default_func (TaskData * tdata, GstTaskPool * pool)
63 GstTaskPoolFunction func;
67 user_data = tdata->user_data;
68 g_slice_free (TaskData, tdata);
74 default_prepare (GstTaskPool * pool, GError ** error)
76 GST_OBJECT_LOCK (pool);
77 pool->pool = g_thread_pool_new ((GFunc) default_func, pool, -1, FALSE, NULL);
78 GST_OBJECT_UNLOCK (pool);
82 default_cleanup (GstTaskPool * pool)
84 GST_OBJECT_LOCK (pool);
86 /* Shut down all the threads, we still process the ones scheduled
87 * because the unref happens in the thread function.
88 * Also wait for currently running ones to finish. */
89 g_thread_pool_free (pool->pool, FALSE, TRUE);
92 GST_OBJECT_UNLOCK (pool);
96 default_push (GstTaskPool * pool, GstTaskPoolFunction func,
97 gpointer user_data, GError ** error)
101 tdata = g_slice_new (TaskData);
103 tdata->user_data = user_data;
105 GST_OBJECT_LOCK (pool);
107 g_thread_pool_push (pool->pool, tdata, error);
109 g_slice_free (TaskData, tdata);
111 GST_OBJECT_UNLOCK (pool);
117 default_join (GstTaskPool * pool, gpointer id)
119 /* we do nothing here, we can't join from the pools */
123 gst_task_pool_class_init (GstTaskPoolClass * klass)
125 GObjectClass *gobject_class;
126 GstTaskPoolClass *gsttaskpool_class;
128 gobject_class = (GObjectClass *) klass;
129 gsttaskpool_class = (GstTaskPoolClass *) klass;
131 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_task_pool_finalize);
133 gsttaskpool_class->prepare = default_prepare;
134 gsttaskpool_class->cleanup = default_cleanup;
135 gsttaskpool_class->push = default_push;
136 gsttaskpool_class->join = default_join;
140 gst_task_pool_init (GstTaskPool * pool)
145 gst_task_pool_finalize (GObject * object)
147 GstTaskPool *pool = GST_TASK_POOL (object);
149 GST_DEBUG ("taskpool %p finalize", pool);
151 G_OBJECT_CLASS (gst_task_pool_parent_class)->finalize (object);
157 * Create a new default task pool. The default task pool will use a regular
158 * GThreadPool for threads.
160 * Returns: a new #GstTaskPool. gst_object_unref() after usage.
163 gst_task_pool_new (void)
167 pool = g_object_new (GST_TYPE_TASK_POOL, NULL);
173 * gst_task_pool_prepare:
174 * @pool: a #GstTaskPool
175 * @error: an error return location
177 * Prepare the taskpool for accepting gst_task_pool_push() operations.
182 gst_task_pool_prepare (GstTaskPool * pool, GError ** error)
184 GstTaskPoolClass *klass;
186 g_return_if_fail (GST_IS_TASK_POOL (pool));
188 klass = GST_TASK_POOL_GET_CLASS (pool);
191 klass->prepare (pool, error);
195 * gst_task_pool_cleanup:
196 * @pool: a #GstTaskPool
198 * Wait for all tasks to be stopped. This is mainly used internally
199 * to ensure proper cleanup of internal data structures in test suites.
204 gst_task_pool_cleanup (GstTaskPool * pool)
206 GstTaskPoolClass *klass;
208 g_return_if_fail (GST_IS_TASK_POOL (pool));
210 klass = GST_TASK_POOL_GET_CLASS (pool);
213 klass->cleanup (pool);
217 * gst_task_pool_push:
218 * @pool: a #GstTaskPool
219 * @func: the function to call
220 * @user_data: data to pass to @func
221 * @error: return location for an error
223 * Start the execution of a new thread from @pool.
225 * Returns: a pointer that should be used for the gst_task_pool_join
226 * function. This pointer can be NULL, you must check @error to detect
230 gst_task_pool_push (GstTaskPool * pool, GstTaskPoolFunction func,
231 gpointer user_data, GError ** error)
233 GstTaskPoolClass *klass;
235 g_return_val_if_fail (GST_IS_TASK_POOL (pool), NULL);
237 klass = GST_TASK_POOL_GET_CLASS (pool);
239 if (klass->push == NULL)
242 return klass->push (pool, func, user_data, error);
247 g_warning ("pushing tasks on pool %p is not supported", pool);
253 * gst_task_pool_join:
254 * @pool: a #GstTaskPool
257 * Join a task and/or return it to the pool. @id is the id obtained from
258 * gst_task_pool_push().
261 gst_task_pool_join (GstTaskPool * pool, gpointer id)
263 GstTaskPoolClass *klass;
265 g_return_if_fail (GST_IS_TASK_POOL (pool));
267 klass = GST_TASK_POOL_GET_CLASS (pool);
270 klass->join (pool, id);