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., 51 Franklin St, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
25 * @short_description: Pool of GStreamer streaming threads
26 * @see_also: #GstTask, #GstPad
28 * This object provides an abstraction for creating threads. The default
29 * implementation uses a regular GThreadPool to start tasks.
31 * Subclasses can be made to create custom threads.
34 #include "gst_private.h"
37 #include "gsttaskpool.h"
40 GST_DEBUG_CATEGORY_STATIC (taskpool_debug);
41 #define GST_CAT_DEFAULT (taskpool_debug)
43 #ifndef GST_DISABLE_GST_DEBUG
44 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, error);
78 GST_OBJECT_UNLOCK (pool);
82 default_cleanup (GstTaskPool * pool)
86 GST_OBJECT_LOCK (pool);
89 GST_OBJECT_UNLOCK (pool);
92 /* Shut down all the threads, we still process the ones scheduled
93 * because the unref happens in the thread function.
94 * Also wait for currently running ones to finish. */
95 g_thread_pool_free (pool_, FALSE, TRUE);
100 default_push (GstTaskPool * pool, GstTaskPoolFunction func,
101 gpointer user_data, GError ** error)
105 tdata = g_slice_new (TaskData);
107 tdata->user_data = user_data;
109 GST_OBJECT_LOCK (pool);
111 g_thread_pool_push (pool->pool, tdata, error);
113 g_slice_free (TaskData, tdata);
114 g_set_error_literal (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
118 GST_OBJECT_UNLOCK (pool);
124 default_join (GstTaskPool * pool, gpointer id)
126 /* we do nothing here, we can't join from the pools */
130 gst_task_pool_class_init (GstTaskPoolClass * klass)
132 GObjectClass *gobject_class;
133 GstTaskPoolClass *gsttaskpool_class;
135 gobject_class = (GObjectClass *) klass;
136 gsttaskpool_class = (GstTaskPoolClass *) klass;
138 #ifndef GST_DISABLE_GST_DEBUG
139 gobject_class->finalize = gst_task_pool_finalize;
142 gsttaskpool_class->prepare = default_prepare;
143 gsttaskpool_class->cleanup = default_cleanup;
144 gsttaskpool_class->push = default_push;
145 gsttaskpool_class->join = default_join;
149 gst_task_pool_init (GstTaskPool * pool)
153 #ifndef GST_DISABLE_GST_DEBUG
155 gst_task_pool_finalize (GObject * object)
157 GST_DEBUG ("taskpool %p finalize", object);
159 G_OBJECT_CLASS (gst_task_pool_parent_class)->finalize (object);
165 * Create a new default task pool. The default task pool will use a regular
166 * GThreadPool for threads.
168 * Returns: (transfer full): a new #GstTaskPool. gst_object_unref() after usage.
171 gst_task_pool_new (void)
175 pool = g_object_new (GST_TYPE_TASK_POOL, NULL);
177 /* clear floating flag */
178 gst_object_ref_sink (pool);
184 * gst_task_pool_prepare:
185 * @pool: a #GstTaskPool
186 * @error: an error return location
188 * Prepare the taskpool for accepting gst_task_pool_push() operations.
193 gst_task_pool_prepare (GstTaskPool * pool, GError ** error)
195 GstTaskPoolClass *klass;
197 g_return_if_fail (GST_IS_TASK_POOL (pool));
199 klass = GST_TASK_POOL_GET_CLASS (pool);
202 klass->prepare (pool, error);
206 * gst_task_pool_cleanup:
207 * @pool: a #GstTaskPool
209 * Wait for all tasks to be stopped. This is mainly used internally
210 * to ensure proper cleanup of internal data structures in test suites.
215 gst_task_pool_cleanup (GstTaskPool * pool)
217 GstTaskPoolClass *klass;
219 g_return_if_fail (GST_IS_TASK_POOL (pool));
221 klass = GST_TASK_POOL_GET_CLASS (pool);
224 klass->cleanup (pool);
228 * gst_task_pool_push:
229 * @pool: a #GstTaskPool
230 * @func: (scope async): the function to call
231 * @user_data: (closure): data to pass to @func
232 * @error: return location for an error
234 * Start the execution of a new thread from @pool.
236 * Returns: (transfer none) (nullable): a pointer that should be used
237 * for the gst_task_pool_join function. This pointer can be %NULL, you
238 * must check @error to detect errors.
241 gst_task_pool_push (GstTaskPool * pool, GstTaskPoolFunction func,
242 gpointer user_data, GError ** error)
244 GstTaskPoolClass *klass;
246 g_return_val_if_fail (GST_IS_TASK_POOL (pool), NULL);
248 klass = GST_TASK_POOL_GET_CLASS (pool);
250 if (klass->push == NULL)
253 return klass->push (pool, func, user_data, error);
258 g_warning ("pushing tasks on pool %p is not supported", pool);
264 * gst_task_pool_join:
265 * @pool: a #GstTaskPool
268 * Join a task and/or return it to the pool. @id is the id obtained from
269 * gst_task_pool_push().
272 gst_task_pool_join (GstTaskPool * pool, gpointer id)
274 GstTaskPoolClass *klass;
276 g_return_if_fail (GST_IS_TASK_POOL (pool));
278 klass = GST_TASK_POOL_GET_CLASS (pool);
281 klass->join (pool, id);