diff --git a/services/audioflinger/Tracks.cpp b/services/audioflinger/Tracks.cpp
index d8d325d..9c6e724 100644
--- a/services/audioflinger/Tracks.cpp
+++ b/services/audioflinger/Tracks.cpp
@@ -288,6 +288,12 @@
     return mTrack->getTimestamp(timestamp);
 }
 
+
+void AudioFlinger::TrackHandle::signal()
+{
+    return mTrack->signal();
+}
+
 status_t AudioFlinger::TrackHandle::onTransact(
     uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
 {
@@ -926,6 +932,16 @@
     mIsInvalid = true;
 }
 
+void AudioFlinger::PlaybackThread::Track::signal()
+{
+    sp<ThreadBase> thread = mThread.promote();
+    if (thread != 0) {
+        PlaybackThread *t = (PlaybackThread *)thread.get();
+        Mutex::Autolock _l(t->mLock);
+        t->broadcast_l();
+    }
+}
+
 // ----------------------------------------------------------------------------
 
 sp<AudioFlinger::PlaybackThread::TimedTrack>