block: add vlc_fifo_TimedWaitCond

include/vlc_block.h

@@ -326,6 +326,7 @@ VLC_API void vlc_fifo_Unlock(vlc_fifo_t *);
 VLC_API void vlc_fifo_Signal(vlc_fifo_t *);
 VLC_API void vlc_fifo_Wait(vlc_fifo_t *);
 VLC_API void vlc_fifo_WaitCond(vlc_fifo_t *, vlc_cond_t *);
+int vlc_fifo_TimedWaitCond(vlc_fifo_t *, vlc_cond_t *, mtime_t);
 VLC_API void vlc_fifo_QueueUnlocked(vlc_fifo_t *, block_t *);
 VLC_API block_t *vlc_fifo_DequeueUnlocked(vlc_fifo_t *) VLC_USED;
 VLC_API block_t *vlc_fifo_DequeueAllUnlocked(vlc_fifo_t *) VLC_USED;

src/misc/fifo.c

@@ -110,6 +110,15 @@ void vlc_fifo_WaitCond(vlc_fifo_t *fifo, vlc_cond_t *condvar)
     vlc_cond_wait(condvar, &fifo->lock);
 }
 
+/**
+ * Atomically unlocks the FIFO and waits until one thread signals the FIFO up
+ * to a certain date, then locks the FIFO again. See vlc_fifo_Wait().
+ */
+int vlc_fifo_TimedWaitCond(vlc_fifo_t *fifo, vlc_cond_t *condvar, mtime_t deadline)
+{
+    return vlc_cond_timedwait(condvar, &fifo->lock, deadline);
+}
+
 /**
  * Checks how many blocks are queued in a locked FIFO.
  *