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video-converter: Only lock the thread pool mutex when running with more than 1 thread

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There's no reason to lock anything if only the current thread is ever
going to do any work.
This commit is contained in:
Sebastian Dröge 2017-02-24 10:02:28 +02:00
parent 49ac382b47
commit 6d20fcc9df
1 changed files with 16 additions and 10 deletions
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26
gst-libs/gst/video/video-converter.c
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@ -291,22 +291,28 @@ static void
gst_parallelized_task_runner_run (GstParallelizedTaskRunner * self,
GstParallelizedTaskFunc func, gpointer * task_data)
{
guint n_threads = self->n_threads;
self->func = func;
self->task_data = task_data;
g_mutex_lock (&self->lock);
self->n_todo = self->n_threads - 2;
self->n_done = 0;
g_cond_broadcast (&self->cond_todo);
g_mutex_unlock (&self->lock);
if (n_threads > 1) {
g_mutex_lock (&self->lock);
self->n_todo = self->n_threads - 2;
self->n_done = 0;
g_cond_broadcast (&self->cond_todo);
g_mutex_unlock (&self->lock);
}
self->func (self->task_data[self->n_threads - 1]);
g_mutex_lock (&self->lock);
while (self->n_done < self->n_threads - 1)
g_cond_wait (&self->cond_done, &self->lock);
self->n_done = 0;
g_mutex_unlock (&self->lock);
if (n_threads > 1) {
g_mutex_lock (&self->lock);
while (self->n_done < self->n_threads - 1)
g_cond_wait (&self->cond_done, &self->lock);
self->n_done = 0;
g_mutex_unlock (&self->lock);
}
self->func = NULL;
self->task_data = NULL;