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      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:
     34     DisconnectWaiter () :
     35         mWaitForDisconnect(false),
     36         mPendingFrames(0) {
     37     }
     38 
     39     void waitForFrame() {
     40         Mutex::Autolock lock(mMutex);
     41         while (mPendingFrames == 0) {
     42             mFrameCondition.wait(mMutex);
     43         }
     44         mPendingFrames--;
     45     }
     46 
     47     virtual void onFrameAvailable(const BufferItem& /* item */) {
     48         Mutex::Autolock lock(mMutex);
     49         mPendingFrames++;
     50         mFrameCondition.signal();
     51     }
     52 
     53     virtual void onBuffersReleased() {
     54         Mutex::Autolock lock(mMutex);
     55         while (!mWaitForDisconnect) {
     56             mDisconnectCondition.wait(mMutex);
     57         }
     58     }
     59 
     60     virtual void onSidebandStreamChanged() {}
     61 
     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