--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gstreamer_core/gst/gsttaskpool.c	Fri Apr 16 15:15:52 2010 +0300
@@ -0,0 +1,292 @@
+/* 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, 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"
+#ifdef __SYMBIAN32__
+#include <glib_global.h>
+#endif
+
+GST_DEBUG_CATEGORY_STATIC (taskpool_debug);
+#define GST_CAT_DEFAULT (taskpool_debug)
+
+static void gst_task_pool_class_init (GstTaskPoolClass * klass);
+static void gst_task_pool_init (GstTaskPool * pool);
+static void gst_task_pool_finalize (GObject * object);
+
+#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;
+
+  gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_task_pool_finalize);
+
+  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)
+{
+}
+
+static void
+gst_task_pool_finalize (GObject * object)
+{
+  GST_DEBUG ("taskpool %p finalize", object);
+
+  G_OBJECT_CLASS (gst_task_pool_parent_class)->finalize (object);
+}
+
+/**
+ * gst_task_pool_new:
+ *
+ * Create a new default task pool. The default task pool will use a regular
+ * GThreadPool for threads.
+ *
+ * Returns: a new #GstTaskPool. gst_object_unref() after usage.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstTaskPool *
+gst_task_pool_new (void)
+{
+  GstTaskPool *pool;
+
+  pool = g_object_new (GST_TYPE_TASK_POOL, 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.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+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.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+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: the function to call
+ * @user_data: data to pass to @func
+ * @error: return location for an error
+ *
+ * Start the execution of a new thread from @pool.
+ *
+ * Returns: 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.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+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().
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+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);
+}