From 74ff8c23f44f1546d0c7004302f4c7ba726ff4c0 Mon Sep 17 00:00:00 2001
From: Dave Burke <daveburke@google.com>
Date: Mon, 12 Mar 2012 21:49:41 -0700
Subject: [PATCH] attempt to fix a deadlock in SurfaceTextureClient::disconnect

- condition wasn't signaled if an error happened between acquire and release
- also replace signal with broadcasts

Bug: 6109450
Change-Id: I8ac03c7eca35c9cc04a00ef7fad36bb9cb3fcef6
---
 libs/gui/BufferQueue.cpp | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/libs/gui/BufferQueue.cpp b/libs/gui/BufferQueue.cpp
index 513a00e9e..54ee6ce98 100644
--- a/libs/gui/BufferQueue.cpp
+++ b/libs/gui/BufferQueue.cpp
@@ -111,7 +111,7 @@ status_t BufferQueue::setBufferCountServerLocked(int bufferCount) {
         // easy, we just have more buffers
         mBufferCount = bufferCount;
         mServerBufferCount = bufferCount;
-        mDequeueCondition.signal();
+        mDequeueCondition.broadcast();
     } else {
         // we're here because we're either
         // - reducing the number of available buffers
@@ -192,7 +192,7 @@ status_t BufferQueue::setBufferCount(int bufferCount) {
     mClientBufferCount = bufferCount;
     mBufferHasBeenQueued = false;
     mQueue.clear();
-    mDequeueCondition.signal();
+    mDequeueCondition.broadcast();
     return OK;
 }
 
@@ -491,7 +491,7 @@ status_t BufferQueue::setSynchronousMode(bool enabled) {
         // - if the client set the number of buffers, we're guaranteed that
         // we have at least 3 (because we don't allow less)
         mSynchronousMode = enabled;
-        mDequeueCondition.signal();
+        mDequeueCondition.broadcast();
     }
     return err;
 }
@@ -559,7 +559,7 @@ status_t BufferQueue::queueBuffer(int buf, int64_t timestamp,
         mSlots[buf].mFrameNumber = mFrameCounter;
 
         mBufferHasBeenQueued = true;
-        mDequeueCondition.signal();
+        mDequeueCondition.broadcast();
 
         *outWidth = mDefaultWidth;
         *outHeight = mDefaultHeight;
@@ -596,7 +596,7 @@ void BufferQueue::cancelBuffer(int buf) {
     }
     mSlots[buf].mBufferState = BufferSlot::FREE;
     mSlots[buf].mFrameNumber = 0;
-    mDequeueCondition.signal();
+    mDequeueCondition.broadcast();
 }
 
 status_t BufferQueue::setCrop(const Rect& crop) {
@@ -704,7 +704,7 @@ status_t BufferQueue::disconnect(int api) {
                 mNextCrop.makeInvalid();
                 mNextScalingMode = NATIVE_WINDOW_SCALING_MODE_FREEZE;
                 mNextTransform = 0;
-                mDequeueCondition.signal();
+                mDequeueCondition.broadcast();
             } else {
                 ST_LOGE("disconnect: connected to another api (cur=%d, req=%d)",
                         mConnectedApi, api);
@@ -841,6 +841,7 @@ status_t BufferQueue::acquire(BufferItem *buffer) {
 
         mSlots[buf].mBufferState = BufferSlot::ACQUIRED;
         mQueue.erase(front);
+        mDequeueCondition.broadcast();
 
         ATRACE_INT(mConsumerName.string(), mQueue.size());
     }
@@ -872,7 +873,7 @@ status_t BufferQueue::releaseBuffer(int buf, EGLDisplay display,
             || mSlots[buf].mBufferState == BufferSlot::ACQUIRED) {
         mSlots[buf].mBufferState = BufferSlot::FREE;
     }
-    mDequeueCondition.signal();
+    mDequeueCondition.broadcast();
 
     return OK;
 }
@@ -883,7 +884,7 @@ status_t BufferQueue::consumerDisconnect() {
     // is considered abandoned
     mAbandoned = true;
     freeAllBuffersLocked();
-    mDequeueCondition.signal();
+    mDequeueCondition.broadcast();
     return OK;
 }