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/*
* 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 <utils/threads.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:
class Barrier {
public:
Barrier();
~Barrier();
void open();
void close();
void waitAndClose();
status_t waitAndClose(nsecs_t timeout);
private:
enum { OPENED, CLOSED };
mutable Mutex lock;
mutable Condition cv;
volatile int state;
};
friend class SurfaceFlinger;
// server constructor
SurfaceFlingerSynchro();
void open();
// wait until there is some work to do
status_t wait();
status_t wait(nsecs_t timeout);
sp<ISurfaceComposer> mSurfaceComposer;
Barrier mBarrier;
};
}; // namespace android
#endif // ANDROID_SURFACE_FLINGER_SYNCHRO_H
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