fix [2170319] gmail bulk operation checkbox latency on passion

This also fixes [2152536] ANR in browser

When SF is enqueuing buffers faster than SF dequeues them.
The update flag in SF is not counted and under some situations SF will only
dequeue the first buffer. The state at this point is not technically
corrupted, it's valid, but just delayed by one buffer.

In the case of the Browser ANR, because the last enqueued buffer was delayed
the resizing of the current buffer couldn't happen.

The system would always fall back onto its feet if anything -else- in
tried to draw, because the "late" buffer would be picked up then.

include/private/ui/SharedBufferStack.h

@@ -289,6 +289,7 @@ public:
     void setStatus(status_t status);
     status_t reallocate();
     status_t assertReallocate(int buffer);
+    int32_t getQueuedCount() const;
     
     Region getDirtyRegion(int buffer) const;
 

include/private/ui/SurfaceFlingerSynchro.h

@@ -1,48 +0,0 @@
-/*
- * Copyright (C) 2008 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-
-#ifndef ANDROID_SURFACE_FLINGER_SYNCHRO_H
-#define ANDROID_SURFACE_FLINGER_SYNCHRO_H
-
-#include <stdint.h>
-#include <sys/types.h>
-#include <utils/Errors.h>
-#include <ui/ISurfaceComposer.h>
-
-namespace android {
-
-class SurfaceFlinger;
-
-class SurfaceFlingerSynchro
-{
-public:
-                // client constructor
-                SurfaceFlingerSynchro(const sp<ISurfaceComposer>& flinger);
-                ~SurfaceFlingerSynchro();
-    
-                // signal surfaceflinger for some work
-    status_t    signal();
-    
-private:
-    friend class SurfaceFlinger;
-    sp<ISurfaceComposer> mSurfaceComposer;
-};
-
-}; // namespace android
-
-#endif // ANDROID_SURFACE_FLINGER_SYNCHRO_H
-

include/ui/SurfaceComposerClient.h

@@ -153,7 +153,7 @@ private:
                 SharedClient*               mControl;
                 sp<IMemoryHeap>             mControlMemory;
                 sp<ISurfaceFlingerClient>   mClient;
-                SurfaceFlingerSynchro*      mSignalServer;
+                sp<ISurfaceComposer>        mSignalServer;
 };
 
 }; // namespace android

libs/surfaceflinger/Layer.cpp

@@ -460,8 +460,10 @@ void Layer::lockPageFlip(bool& recomputeVisibleRegions)
         }
     }
 
-    // FIXME: signal an event if we have more buffers waiting
-    // mFlinger->signalEvent();
+    if (lcblk->getQueuedCount()) {
+        // signal an event if we have more buffers waiting
+        mFlinger->signalEvent();
+    }
 
     if (!mPostedDirtyRegion.isEmpty()) {
         reloadTexture( mPostedDirtyRegion );

libs/ui/Android.mk

@@ -27,8 +27,7 @@ LOCAL_SRC_FILES:= \
 	Region.cpp \
 	SharedBufferStack.cpp \
 	Surface.cpp \
-	SurfaceComposerClient.cpp \
-	SurfaceFlingerSynchro.cpp 
+	SurfaceComposerClient.cpp
 
 LOCAL_SHARED_LIBRARIES := \
 	libcutils \

libs/ui/SharedBufferStack.cpp

@@ -394,6 +394,12 @@ status_t SharedBufferServer::reallocate()
     return NO_ERROR;
 }
 
+int32_t SharedBufferServer::getQueuedCount() const
+{
+    SharedBufferStack& stack( *mSharedStack );
+    return stack.queued;
+}
+
 status_t SharedBufferServer::assertReallocate(int buffer)
 {
     ReallocateCondition condition(this, buffer);

libs/ui/SurfaceComposerClient.cpp

@@ -42,7 +42,6 @@
 
 #include <private/ui/LayerState.h>
 #include <private/ui/SharedBufferStack.h>
-#include <private/ui/SurfaceFlingerSynchro.h>
 
 #define VERBOSE(...)	((void)0)
 //#define VERBOSE			LOGD
@@ -155,7 +154,6 @@ void SurfaceComposerClient::_init(
 {
     VERBOSE("Creating client %p, conn %p", this, conn.get());
 
-    mSignalServer = 0;
     mPrebuiltLayerState = 0;
     mTransactionOpen = 0;
     mStatus = NO_ERROR;
@@ -168,7 +166,7 @@ void SurfaceComposerClient::_init(
     }
 
     mControlMemory = mClient->getControlBlock();
-    mSignalServer = new SurfaceFlingerSynchro(sm);
+    mSignalServer = sm;
     mControl = static_cast<SharedClient *>(mControlMemory->getBase());
 }
 
@@ -225,7 +223,6 @@ void SurfaceComposerClient::dispose()
         Mutex::Autolock _lg(gLock);
         Mutex::Autolock _lm(mLock);
 
-        delete mSignalServer;
         mSignalServer = 0;
 
         if (mClient != 0) {

libs/ui/SurfaceFlingerSynchro.cpp

@@ -1,42 +0,0 @@
-/*
- * Copyright (C) 2008 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include <stdint.h>
-
-#include <private/ui/SurfaceFlingerSynchro.h>
-
-namespace android {
-
-// ---------------------------------------------------------------------------
-
-SurfaceFlingerSynchro::SurfaceFlingerSynchro(const sp<ISurfaceComposer>& flinger)
-    : mSurfaceComposer(flinger)
-{
-}
-SurfaceFlingerSynchro::~SurfaceFlingerSynchro()
-{
-}
-
-status_t SurfaceFlingerSynchro::signal()
-{
-    mSurfaceComposer->signal();
-    return NO_ERROR;
-}
-
-// ---------------------------------------------------------------------------
-
-}; // namespace android
-