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| author | Max Kellermann <max@duempel.org> | 2013-11-06 23:30:29 +0100 |
|---|---|---|
| committer | Max Kellermann <max@duempel.org> | 2013-11-06 23:51:17 +0100 |
| commit | 77c63511d8809f7785328138e7e3a50303302730 (patch) | |
| tree | 6743b89744cb41f36de56a526143b3cbb9c7eb6f /src/PlayerThread.cxx | |
| parent | 0be5a6ab2b9201e60f3ecb363fcc9342ecfa8aee (diff) | |
| download | mpd-77c63511d8809f7785328138e7e3a50303302730.tar.gz mpd-77c63511d8809f7785328138e7e3a50303302730.tar.xz mpd-77c63511d8809f7785328138e7e3a50303302730.zip | |
PlayerThread: reduce the number of DecoderThread wakeups
After the number of decoded chunks has fallen below the threshold, the
PlayerThread woke up the DecoderThread over and over. This commit
adds a boolean flag that avoids these duplicate wakeups, and thus
reduces the number of system calls.
Diffstat (limited to 'src/PlayerThread.cxx')
| -rw-r--r-- | src/PlayerThread.cxx | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/src/PlayerThread.cxx b/src/PlayerThread.cxx index e2e3ee3a4..cb3d6a9a4 100644 --- a/src/PlayerThread.cxx +++ b/src/PlayerThread.cxx @@ -69,6 +69,12 @@ class Player { bool decoder_starting; /** + * Did we wake up the DecoderThread recently? This avoids + * duplicate wakeup calls. + */ + bool decoder_woken; + + /** * is the player paused? */ bool paused; @@ -133,6 +139,7 @@ public: :pc(_pc), dc(_dc), buffer(_buffer), buffering(true), decoder_starting(false), + decoder_woken(false), paused(false), queued(true), output_open(false), @@ -861,8 +868,13 @@ Player::PlayNextChunk() pc.Lock(); if (!dc.IsIdle() && dc.pipe->GetSize() <= (pc.buffered_before_play + - buffer.GetSize() * 3) / 4) - dc.Signal(); + buffer.GetSize() * 3) / 4) { + if (!decoder_woken) { + decoder_woken = true; + dc.Signal(); + } + } else + decoder_woken = false; pc.Unlock(); return true; |