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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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b6df564251
While the default implementation will spawn a thread per new pushed task, this new implementation instead spawns a maximum number of threads, then queues new tasks on existing threads. The thread that the new task will be queued on is picked in a pretty naive fashion, by simply popping the first thread from a queue and pushing it back to the tail, but this is an implementation detail and can always be sophisticated in the future if the need arises. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/692>
487 lines
11 KiB
C
487 lines
11 KiB
C
/* GStreamer
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* Copyright (C) 2005 Thomas Vander Stichele <thomas at apestaart dot org>
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*
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* gsttask.c: Unit test for GstTask
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/check/gstcheck.h>
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static GMutex task_lock;
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static GCond task_cond;
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static GRecMutex task_mutex;
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#define TEST_RACE_ITERATIONS 1000
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static void
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task_resume_func (void *data)
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{
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g_mutex_lock (&task_lock);
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g_cond_signal (&task_cond);
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g_mutex_unlock (&task_lock);
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}
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GST_START_TEST (test_resume)
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{
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GstTask *t;
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t = gst_task_new (task_resume_func, &t, NULL);
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fail_if (t == NULL);
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g_rec_mutex_init (&task_mutex);
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gst_task_set_lock (t, &task_mutex);
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g_cond_init (&task_cond);
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g_mutex_init (&task_lock);
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g_mutex_lock (&task_lock);
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/* Pause the task, and resume it. */
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fail_unless (gst_task_pause (t));
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fail_unless (gst_task_resume (t));
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while (GST_TASK_STATE (t) != GST_TASK_STARTED)
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g_cond_wait (&task_cond, &task_lock);
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fail_unless (gst_task_stop (t));
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g_mutex_unlock (&task_lock);
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fail_unless (gst_task_join (t));
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/* Make sure we cannot resume from stopped. */
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fail_if (gst_task_resume (t));
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gst_object_unref (t);
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}
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GST_END_TEST;
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static void
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task_signal_pause_func (void *data)
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{
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GstTask **t = data;
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g_mutex_lock (&task_lock);
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GST_DEBUG ("signal");
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g_cond_signal (&task_cond);
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gst_task_pause (*t);
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g_mutex_unlock (&task_lock);
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}
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GST_START_TEST (test_pause_stop_race)
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{
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guint it = TEST_RACE_ITERATIONS;
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GstTask *t;
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gboolean ret;
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t = gst_task_new (task_signal_pause_func, &t, NULL);
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fail_if (t == NULL);
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g_rec_mutex_init (&task_mutex);
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gst_task_set_lock (t, &task_mutex);
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g_cond_init (&task_cond);
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g_mutex_init (&task_lock);
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while (it-- > 0) {
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g_mutex_lock (&task_lock);
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GST_DEBUG ("starting");
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ret = gst_task_start (t);
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fail_unless (ret == TRUE);
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/* wait for it to spin up */
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GST_DEBUG ("waiting");
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g_cond_wait (&task_cond, &task_lock);
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GST_DEBUG ("done waiting");
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g_mutex_unlock (&task_lock);
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GST_DEBUG ("starting");
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ret = gst_task_stop (t);
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fail_unless (ret == TRUE);
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GST_DEBUG ("joining");
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ret = gst_task_join (t);
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fail_unless (ret == TRUE);
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}
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g_cond_clear (&task_cond);
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g_mutex_clear (&task_lock);
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gst_object_unref (t);
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}
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GST_END_TEST;
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static void
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task_func2 (void *data)
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{
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gboolean ret;
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GstTask *t = *((GstTask **) data);
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g_mutex_lock (&task_lock);
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GST_DEBUG ("signal");
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g_cond_signal (&task_cond);
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g_mutex_unlock (&task_lock);
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ASSERT_WARNING (ret = gst_task_join (t));
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fail_unless (ret == FALSE);
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}
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GST_START_TEST (test_join)
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{
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GstTask *t;
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gboolean ret;
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t = gst_task_new (task_func2, &t, NULL);
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fail_if (t == NULL);
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g_rec_mutex_init (&task_mutex);
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gst_task_set_lock (t, &task_mutex);
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g_cond_init (&task_cond);
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g_mutex_init (&task_lock);
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g_mutex_lock (&task_lock);
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GST_DEBUG ("starting");
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ret = gst_task_start (t);
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fail_unless (ret == TRUE);
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/* wait for it to spin up */
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GST_DEBUG ("waiting");
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g_cond_wait (&task_cond, &task_lock);
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GST_DEBUG ("done waiting");
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g_mutex_unlock (&task_lock);
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GST_DEBUG ("joining");
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ret = gst_task_join (t);
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fail_unless (ret == TRUE);
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gst_task_cleanup_all ();
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gst_object_unref (t);
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}
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GST_END_TEST;
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static void
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task_func (void *data)
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{
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g_mutex_lock (&task_lock);
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GST_DEBUG ("signal");
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g_cond_signal (&task_cond);
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g_mutex_unlock (&task_lock);
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}
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GST_START_TEST (test_lock_start)
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{
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GstTask *t;
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gboolean ret;
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t = gst_task_new (task_func, NULL, NULL);
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fail_if (t == NULL);
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g_rec_mutex_init (&task_mutex);
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gst_task_set_lock (t, &task_mutex);
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g_cond_init (&task_cond);
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g_mutex_init (&task_lock);
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g_mutex_lock (&task_lock);
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GST_DEBUG ("starting");
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ret = gst_task_start (t);
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fail_unless (ret == TRUE);
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/* wait for it to spin up */
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GST_DEBUG ("waiting");
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g_cond_wait (&task_cond, &task_lock);
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GST_DEBUG ("done waiting");
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g_mutex_unlock (&task_lock);
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/* cannot set mutex now */
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ASSERT_WARNING (gst_task_set_lock (t, &task_mutex));
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GST_DEBUG ("joining");
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ret = gst_task_join (t);
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fail_unless (ret == TRUE);
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gst_task_cleanup_all ();
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gst_object_unref (t);
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}
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GST_END_TEST;
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GST_START_TEST (test_lock)
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{
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GstTask *t;
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gboolean ret;
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t = gst_task_new (task_func, NULL, NULL);
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fail_if (t == NULL);
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g_rec_mutex_init (&task_mutex);
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gst_task_set_lock (t, &task_mutex);
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GST_DEBUG ("pause");
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ret = gst_task_pause (t);
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fail_unless (ret == TRUE);
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g_usleep (1 * G_USEC_PER_SEC / 2);
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GST_DEBUG ("joining");
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ret = gst_task_join (t);
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fail_unless (ret == TRUE);
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g_usleep (1 * G_USEC_PER_SEC / 2);
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gst_object_unref (t);
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}
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GST_END_TEST;
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GST_START_TEST (test_no_lock)
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{
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GstTask *t;
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gboolean ret;
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t = gst_task_new (task_func, NULL, NULL);
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fail_if (t == NULL);
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/* stop should be possible without lock */
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gst_task_stop (t);
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/* pause should give a warning */
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ASSERT_WARNING (ret = gst_task_pause (t));
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fail_unless (ret == FALSE);
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/* start should give a warning */
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ASSERT_WARNING (ret = gst_task_start (t));
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fail_unless (ret == FALSE);
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/* stop should be possible without lock */
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gst_task_stop (t);
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gst_object_unref (t);
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}
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GST_END_TEST;
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GST_START_TEST (test_create)
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{
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GstTask *t;
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t = gst_task_new (task_func, NULL, NULL);
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fail_if (t == NULL);
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gst_object_unref (t);
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}
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GST_END_TEST;
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typedef struct
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{
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gboolean called;
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gpointer caller_thread;
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GCond blocked_cond;
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GMutex blocked_lock;
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gboolean blocked;
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GCond unblock_cond;
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GMutex unblock_lock;
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gboolean unblock;
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} TaskData;
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static void
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task_cb (TaskData * tdata)
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{
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tdata->called = TRUE;
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tdata->caller_thread = g_thread_self ();
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g_mutex_lock (&tdata->blocked_lock);
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tdata->blocked = TRUE;
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g_cond_signal (&tdata->blocked_cond);
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g_mutex_unlock (&tdata->blocked_lock);
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g_mutex_lock (&tdata->unblock_lock);
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while (!tdata->unblock)
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g_cond_wait (&tdata->unblock_cond, &tdata->unblock_lock);
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g_mutex_unlock (&tdata->unblock_lock);
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}
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static void
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init_task_data (TaskData * tdata)
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{
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tdata->called = FALSE;
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tdata->caller_thread = NULL;
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tdata->unblock = FALSE;
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g_cond_init (&tdata->unblock_cond);
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g_mutex_init (&tdata->unblock_lock);
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tdata->blocked = FALSE;
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g_cond_init (&tdata->blocked_cond);
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g_mutex_init (&tdata->blocked_lock);
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}
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static void
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cleanup_task_data (TaskData * tdata)
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{
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g_mutex_clear (&tdata->unblock_lock);
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g_cond_clear (&tdata->unblock_cond);
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g_mutex_clear (&tdata->blocked_lock);
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g_cond_clear (&tdata->blocked_cond);
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}
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/* In this test, we use a shared task pool with max-threads=1 and verify
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* that the caller thread for two tasks is the same */
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GST_START_TEST (test_shared_task_pool_shared_thread)
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{
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GstTaskPool *pool;
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gpointer handle, handle2;
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GError *err = NULL;
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TaskData tdata, tdata2;
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init_task_data (&tdata);
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init_task_data (&tdata2);
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pool = gst_shared_task_pool_new ();
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gst_task_pool_prepare (pool, &err);
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fail_unless (err == NULL);
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/* We request that two tasks be executed, and our task function is blocking.
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* This means no new thread is available to spawn, and the second task should
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* be queued up on the first thread */
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handle =
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gst_task_pool_push (pool, (GstTaskPoolFunction) task_cb, &tdata, &err);
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fail_unless (err == NULL);
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handle2 =
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gst_task_pool_push (pool, (GstTaskPoolFunction) task_cb, &tdata2, &err);
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fail_unless (err == NULL);
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g_mutex_lock (&tdata.unblock_lock);
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tdata.unblock = TRUE;
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g_cond_signal (&tdata.unblock_cond);
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g_mutex_unlock (&tdata.unblock_lock);
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g_mutex_lock (&tdata2.unblock_lock);
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tdata2.unblock = TRUE;
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g_cond_signal (&tdata2.unblock_cond);
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g_mutex_unlock (&tdata2.unblock_lock);
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gst_task_pool_join (pool, handle);
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gst_task_pool_join (pool, handle2);
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fail_unless (tdata.called == TRUE);
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fail_unless (tdata2.called == TRUE);
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fail_unless (tdata.caller_thread == tdata2.caller_thread);
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cleanup_task_data (&tdata);
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cleanup_task_data (&tdata2);
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gst_task_pool_cleanup (pool);
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g_object_unref (pool);
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}
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GST_END_TEST;
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/* In this test, we use a shared task pool with max-threads=2 and verify
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* that the caller thread for two tasks is different */
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GST_START_TEST (test_shared_task_pool_two_threads)
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{
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GstTaskPool *pool;
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gpointer handle, handle2;
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GError *err = NULL;
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TaskData tdata, tdata2;
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init_task_data (&tdata);
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init_task_data (&tdata2);
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pool = gst_shared_task_pool_new ();
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gst_shared_task_pool_set_max_threads (GST_SHARED_TASK_POOL (pool), 2);
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gst_task_pool_prepare (pool, &err);
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fail_unless (err == NULL);
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/* We request that two tasks be executed, and our task function is blocking.
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* This means the pool will have to spawn a new thread to handle the task */
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handle =
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gst_task_pool_push (pool, (GstTaskPoolFunction) task_cb, &tdata, &err);
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fail_unless (err == NULL);
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handle2 =
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gst_task_pool_push (pool, (GstTaskPoolFunction) task_cb, &tdata2, &err);
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fail_unless (err == NULL);
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/* Make sure that the second task has started executing before unblocking */
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g_mutex_lock (&tdata2.blocked_lock);
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while (!tdata2.blocked) {
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g_cond_wait (&tdata2.blocked_cond, &tdata2.blocked_lock);
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}
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g_mutex_unlock (&tdata2.blocked_lock);
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g_mutex_lock (&tdata.unblock_lock);
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tdata.unblock = TRUE;
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g_cond_signal (&tdata.unblock_cond);
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g_mutex_unlock (&tdata.unblock_lock);
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g_mutex_lock (&tdata2.unblock_lock);
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tdata2.unblock = TRUE;
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g_cond_signal (&tdata2.unblock_cond);
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g_mutex_unlock (&tdata2.unblock_lock);
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gst_task_pool_join (pool, handle);
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gst_task_pool_join (pool, handle2);
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fail_unless (tdata.called == TRUE);
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fail_unless (tdata2.called == TRUE);
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fail_unless (tdata.caller_thread != tdata2.caller_thread);
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cleanup_task_data (&tdata);
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cleanup_task_data (&tdata2);
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gst_task_pool_cleanup (pool);
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g_object_unref (pool);
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}
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GST_END_TEST;
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static Suite *
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gst_task_suite (void)
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{
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Suite *s = suite_create ("GstTask");
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TCase *tc_chain = tcase_create ("task tests");
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suite_add_tcase (s, tc_chain);
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tcase_add_test (tc_chain, test_create);
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tcase_add_test (tc_chain, test_no_lock);
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tcase_add_test (tc_chain, test_lock);
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tcase_add_test (tc_chain, test_lock_start);
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tcase_add_test (tc_chain, test_join);
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tcase_add_test (tc_chain, test_pause_stop_race);
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tcase_add_test (tc_chain, test_resume);
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tcase_add_test (tc_chain, test_shared_task_pool_shared_thread);
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tcase_add_test (tc_chain, test_shared_task_pool_two_threads);
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return s;
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}
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GST_CHECK_MAIN (gst_task);
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