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https://github.com/mpv-player/mpv
synced 2024-10-02 16:25:33 +02:00
player: remove in_dispatch field
(Not sure if worth the trouble, but it does seem less awkward.)
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435bc003c0
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@ -30,6 +30,8 @@ struct mp_dispatch_queue {
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pthread_cond_t cond;
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void (*wakeup_fn)(void *wakeup_ctx);
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void *wakeup_ctx;
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// Time at which mp_dispatch_queue_process() should return.
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int64_t wait;
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// Make mp_dispatch_queue_process() exit if it's idle.
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bool interrupted;
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// The target thread is in mp_dispatch_queue_process() (and either idling,
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@ -250,9 +252,8 @@ void mp_dispatch_run(struct mp_dispatch_queue *queue,
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// no enqueued callback can call the lock/unlock functions).
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void mp_dispatch_queue_process(struct mp_dispatch_queue *queue, double timeout)
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{
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int64_t wait = timeout > 0 ? mp_add_timeout(mp_time_us(), timeout) : 0;
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pthread_mutex_lock(&queue->lock);
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queue->wait = timeout > 0 ? mp_add_timeout(mp_time_us(), timeout) : 0;
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assert(!queue->in_process); // recursion not allowed
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queue->in_process = true;
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queue->in_process_thread = pthread_self();
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@ -288,10 +289,10 @@ void mp_dispatch_queue_process(struct mp_dispatch_queue *queue, double timeout)
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} else {
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item->completed = true;
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}
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} else if (wait > 0 && !queue->interrupted) {
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struct timespec ts = mp_time_us_to_timespec(wait);
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} else if (queue->wait > 0 && !queue->interrupted) {
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struct timespec ts = mp_time_us_to_timespec(queue->wait);
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if (pthread_cond_timedwait(&queue->cond, &queue->lock, &ts))
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wait = 0;
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queue->wait = 0;
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} else {
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break;
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}
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@ -305,9 +306,9 @@ void mp_dispatch_queue_process(struct mp_dispatch_queue *queue, double timeout)
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// If the queue is inside of mp_dispatch_queue_process(), make it return as
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// soon as all work items have been run, without waiting for the timeout. This
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// does not make it return early if it's blocked by a mp_dispatch_lock().
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// If mp_dispatch_queue_process() is called in a reentrant way (including the
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// case where another thread calls mp_dispatch_lock() and then
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// mp_dispatch_queue_process()), this affects only the "topmost" invocation.
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// If the queue is _not_ inside of mp_dispatch_queue_process(), make the next
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// call of it use a timeout of 0 (this is useful behavior if you need to
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// wakeup the main thread from another thread in a race free way).
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void mp_dispatch_interrupt(struct mp_dispatch_queue *queue)
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{
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pthread_mutex_lock(&queue->lock);
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@ -316,6 +317,24 @@ void mp_dispatch_interrupt(struct mp_dispatch_queue *queue)
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pthread_mutex_unlock(&queue->lock);
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}
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// If a mp_dispatch_queue_process() call is in progress, then adjust the maximum
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// time it blocks due to its timeout argument. Otherwise does nothing. (It
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// makes sense to call this in code that uses both mp_dispatch_[un]lock() and
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// a normal event loop.)
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// Does not work correctly with queues that have mp_dispatch_set_wakeup_fn()
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// called on them, because this implies you actually do waiting via
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// mp_dispatch_queue_process(), while wakeup callbacks are used when you need
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// to wait in external APIs.
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void mp_dispatch_adjust_timeout(struct mp_dispatch_queue *queue, int64_t until)
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{
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pthread_mutex_lock(&queue->lock);
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if (queue->in_process && queue->wait > until) {
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queue->wait = until;
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pthread_cond_broadcast(&queue->cond);
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}
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pthread_mutex_unlock(&queue->lock);
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}
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// Grant exclusive access to the target thread's state. While this is active,
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// no other thread can return from mp_dispatch_lock() (i.e. it behaves like
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// a pthread mutex), and no other thread can get dispatch items completed.
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@ -1,6 +1,8 @@
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#ifndef MP_DISPATCH_H_
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#define MP_DISPATCH_H_
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#include <stdint.h>
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typedef void (*mp_dispatch_fn)(void *data);
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struct mp_dispatch_queue;
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@ -20,6 +22,7 @@ void mp_dispatch_run(struct mp_dispatch_queue *queue,
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mp_dispatch_fn fn, void *fn_data);
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void mp_dispatch_queue_process(struct mp_dispatch_queue *queue, double timeout);
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void mp_dispatch_interrupt(struct mp_dispatch_queue *queue);
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void mp_dispatch_adjust_timeout(struct mp_dispatch_queue *queue, int64_t until);
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void mp_dispatch_lock(struct mp_dispatch_queue *queue);
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void mp_dispatch_unlock(struct mp_dispatch_queue *queue);
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@ -234,7 +234,6 @@ typedef struct MPContext {
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struct mp_client_api *clients;
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struct mp_dispatch_queue *dispatch;
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struct mp_cancel *playback_abort;
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bool in_dispatch;
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// Number of asynchronous tasks that still need to finish until MPContext
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// destruction is ok. It's implied that the async tasks call
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// mp_wakeup_core() each time this is decremented.
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@ -57,11 +57,8 @@ void mp_wait_events(struct MPContext *mpctx)
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if (sleeping)
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MP_STATS(mpctx, "start sleep");
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mpctx->in_dispatch = true;
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mp_dispatch_queue_process(mpctx->dispatch, mpctx->sleeptime);
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mpctx->in_dispatch = false;
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mpctx->sleeptime = INFINITY;
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if (sleeping)
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@ -73,11 +70,11 @@ void mp_wait_events(struct MPContext *mpctx)
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// mp_set_timeout(c, 0) is essentially equivalent to mp_wakeup_core(c).
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void mp_set_timeout(struct MPContext *mpctx, double sleeptime)
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{
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mpctx->sleeptime = MPMIN(mpctx->sleeptime, sleeptime);
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// Can't adjust timeout if called from mp_dispatch_queue_process().
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if (mpctx->in_dispatch && isfinite(sleeptime))
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mp_wakeup_core(mpctx);
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if (mpctx->sleeptime > sleeptime) {
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mpctx->sleeptime = sleeptime;
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int64_t abstime = mp_add_timeout(mp_time_us(), sleeptime);
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mp_dispatch_adjust_timeout(mpctx->dispatch, abstime);
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}
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}
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// Cause the playloop to run. This can be called from any thread. If called
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