1 /* 2 * Copyright 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ANDROID_DISCONNECT_WAITER_H 18 #define ANDROID_DISCONNECT_WAITER_H 19 20 #include <gui/IConsumerListener.h> 21 22 #include <utils/Condition.h> 23 #include <utils/Mutex.h> 24 25 namespace android { 26 27 // Note that GLConsumer will lose the notifications 28 // onBuffersReleased and onFrameAvailable as there is currently 29 // no way to forward the events. This DisconnectWaiter will not let the 30 // disconnect finish until finishDisconnect() is called. It will 31 // also block until a disconnect is called 32 class DisconnectWaiter : public BnConsumerListener { 33 public: DisconnectWaiter()34 DisconnectWaiter () : 35 mWaitForDisconnect(false), 36 mPendingFrames(0) { 37 } 38 waitForFrame()39 void waitForFrame() { 40 Mutex::Autolock lock(mMutex); 41 while (mPendingFrames == 0) { 42 mFrameCondition.wait(mMutex); 43 } 44 mPendingFrames--; 45 } 46 onFrameAvailable(const BufferItem &)47 virtual void onFrameAvailable(const BufferItem& /* item */) { 48 Mutex::Autolock lock(mMutex); 49 mPendingFrames++; 50 mFrameCondition.signal(); 51 } 52 onBuffersReleased()53 virtual void onBuffersReleased() { 54 Mutex::Autolock lock(mMutex); 55 while (!mWaitForDisconnect) { 56 mDisconnectCondition.wait(mMutex); 57 } 58 } 59 onSidebandStreamChanged()60 virtual void onSidebandStreamChanged() {} 61 finishDisconnect()62 void finishDisconnect() { 63 Mutex::Autolock lock(mMutex); 64 mWaitForDisconnect = true; 65 mDisconnectCondition.signal(); 66 } 67 68 private: 69 Mutex mMutex; 70 71 bool mWaitForDisconnect; 72 Condition mDisconnectCondition; 73 74 int mPendingFrames; 75 Condition mFrameCondition; 76 }; 77 78 } // namespace android 79 80 #endif 81