77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
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/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_SURFACE_FLINGER_SYNCHRO_H
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#define ANDROID_SURFACE_FLINGER_SYNCHRO_H
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#include <stdint.h>
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#include <sys/types.h>
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#include <utils/Errors.h>
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#include <utils/threads.h>
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#include <ui/ISurfaceComposer.h>
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namespace android {
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class SurfaceFlinger;
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class SurfaceFlingerSynchro
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{
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public:
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// client constructor
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SurfaceFlingerSynchro(const sp<ISurfaceComposer>& flinger);
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~SurfaceFlingerSynchro();
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// signal surfaceflinger for some work
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status_t signal();
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private:
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class Barrier {
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public:
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Barrier();
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~Barrier();
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void open();
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void close();
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void waitAndClose();
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status_t waitAndClose(nsecs_t timeout);
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private:
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enum { OPENED, CLOSED };
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mutable Mutex lock;
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mutable Condition cv;
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volatile int state;
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};
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friend class SurfaceFlinger;
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// server constructor
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SurfaceFlingerSynchro();
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void open();
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// wait until there is some work to do
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status_t wait();
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status_t wait(nsecs_t timeout);
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sp<ISurfaceComposer> mSurfaceComposer;
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Barrier mBarrier;
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};
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}; // namespace android
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#endif // ANDROID_SURFACE_FLINGER_SYNCHRO_H
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