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task: avoid task lock for each iteration

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Make the task state an atomic variable so that we can avoid taking and releasing
the task lock for each iteration.
This commit is contained in:
Wim Taymans 2010-10-20 11:58:06 +02:00
parent caf006c03a
commit 1e1872137d
1 changed files with 34 additions and 30 deletions
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64
gst/gsttask.c
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@ -82,6 +82,9 @@
GST_DEBUG_CATEGORY_STATIC (task_debug);
#define GST_CAT_DEFAULT (task_debug)
#define SET_TASK_STATE(t,s) (g_atomic_int_set (&GST_TASK_STATE(t), (s)))
#define GET_TASK_STATE(t) (g_atomic_int_get (&GST_TASK_STATE(t)))
#define GST_TASK_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_TASK, GstTaskPrivate))
@ -185,7 +188,7 @@ gst_task_init (GstTask * task)
task->abidata.ABI.thread = NULL;
task->lock = NULL;
task->cond = g_cond_new ();
task->state = GST_TASK_STOPPED;
SET_TASK_STATE (task, GST_TASK_STOPPED);
task->priv->prio_set = FALSE;
/* use the default klass pool for this task, users can
@ -226,6 +229,7 @@ gst_task_configure_name (GstTask * task)
const gchar *name;
gchar thread_name[17] = { 0, };
GST_OBJECT_LOCK (task);
name = GST_OBJECT_NAME (task);
/* set the thread name to something easily identifiable */
@ -236,6 +240,7 @@ gst_task_configure_name (GstTask * task)
if (prctl (PR_SET_NAME, (unsigned long int) thread_name, 0, 0, 0))
GST_DEBUG_OBJECT (task, "Failed to set thread name");
}
GST_OBJECT_UNLOCK (task);
#endif
#ifdef _MSC_VER
const gchar *name;
@ -264,7 +269,7 @@ gst_task_func (GstTask * task)
* mark our state running so that nobody can mess with
* the mutex. */
GST_OBJECT_LOCK (task);
if (task->state == GST_TASK_STOPPED)
if (GET_TASK_STATE (task) == GST_TASK_STOPPED)
goto exit;
lock = GST_TASK_GET_LOCK (task);
if (G_UNLIKELY (lock == NULL))
@ -281,37 +286,38 @@ gst_task_func (GstTask * task)
/* locking order is TASK_LOCK, LOCK */
g_static_rec_mutex_lock (lock);
GST_OBJECT_LOCK (task);
/* configure the thread name now */
gst_task_configure_name (task);
while (G_LIKELY (task->state != GST_TASK_STOPPED)) {
while (G_UNLIKELY (task->state == GST_TASK_PAUSED)) {
gint t;
t = g_static_rec_mutex_unlock_full (lock);
if (t <= 0) {
g_warning ("wrong STREAM_LOCK count %d", t);
}
GST_TASK_SIGNAL (task);
GST_TASK_WAIT (task);
GST_OBJECT_UNLOCK (task);
/* locking order.. */
if (t > 0)
g_static_rec_mutex_lock_full (lock, t);
while (G_LIKELY (GET_TASK_STATE (task) != GST_TASK_STOPPED)) {
if (G_UNLIKELY (GET_TASK_STATE (task) == GST_TASK_PAUSED)) {
GST_OBJECT_LOCK (task);
if (G_UNLIKELY (task->state == GST_TASK_STOPPED))
goto done;
while (G_UNLIKELY (GST_TASK_STATE (task) == GST_TASK_PAUSED)) {
gint t;
t = g_static_rec_mutex_unlock_full (lock);
if (t <= 0) {
g_warning ("wrong STREAM_LOCK count %d", t);
}
GST_TASK_SIGNAL (task);
GST_TASK_WAIT (task);
GST_OBJECT_UNLOCK (task);
/* locking order.. */
if (t > 0)
g_static_rec_mutex_lock_full (lock, t);
GST_OBJECT_LOCK (task);
if (G_UNLIKELY (GET_TASK_STATE (task) == GST_TASK_STOPPED)) {
GST_OBJECT_UNLOCK (task);
goto done;
}
}
GST_OBJECT_UNLOCK (task);
}
GST_OBJECT_UNLOCK (task);
task->func (task->data);
GST_OBJECT_LOCK (task);
}
done:
GST_OBJECT_UNLOCK (task);
g_static_rec_mutex_unlock (lock);
GST_OBJECT_LOCK (task);
@ -610,9 +616,7 @@ gst_task_get_state (GstTask * task)
g_return_val_if_fail (GST_IS_TASK (task), GST_TASK_STOPPED);
GST_OBJECT_LOCK (task);
result = task->state;
GST_OBJECT_UNLOCK (task);
result = GET_TASK_STATE (task);
return result;
}
@ -684,9 +688,9 @@ gst_task_set_state (GstTask * task, GstTaskState state)
goto no_lock;
/* if the state changed, do our thing */
old = task->state;
old = GET_TASK_STATE (task);
if (old != state) {
task->state = state;
SET_TASK_STATE (task, state);
switch (old) {
case GST_TASK_STOPPED:
/* If the task already has a thread scheduled we don't have to do
@ -810,7 +814,7 @@ gst_task_join (GstTask * task)
GST_OBJECT_LOCK (task);
if (G_UNLIKELY (tself == task->abidata.ABI.thread))
goto joining_self;
task->state = GST_TASK_STOPPED;
SET_TASK_STATE (task, GST_TASK_STOPPED);
/* signal the state change for when it was blocked in PAUSED. */
GST_TASK_SIGNAL (task);
/* we set the running flag when pushing the task on the thread pool.