Avoid waking the output thread if the output queue is empty.

git-svn-id: http://nohands.svn.sourceforge.net/svnroot/nohands/trunk@68 126591fb-c623-4b62-a76d-97a8e4f34109

1 files changed, 5 insertions, 2 deletions

diff --git a/libhfp/soundio-alsa.cpp b/libhfp/soundio-alsa.cpp
index 6c14c6a..9565684 100644
--- a/libhfp/soundio-alsa.cpp
+++ b/libhfp/soundio-alsa.cpp
@@ -1370,9 +1370,12 @@ public:
 	}
 
 	virtual void SndPushOutput(bool nonblock) {
-		/* Wake up the output thread if it's sleeping */
+		/*
+		 * Wake up the output thread if it's sleeping and
+		 * there's something for it to do
+		 */
 		m_lock.Lock();
-		if (m_play_idle)
+		if (m_play_idle && m_output.TotalFill())
 			m_lock.Signal();
 		m_lock.Unlock();
 	}