74 lines
1.8 KiB
C++
74 lines
1.8 KiB
C++
/*
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* Copyright (C) 2009 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_MESSAGE_QUEUE_H
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#define ANDROID_MESSAGE_QUEUE_H
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#include <stdint.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <utils/threads.h>
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#include <utils/Timers.h>
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#include <utils/Looper.h>
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#include "Barrier.h"
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namespace android {
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// ---------------------------------------------------------------------------
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class MessageBase : public MessageHandler
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{
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public:
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MessageBase();
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// return true if message has a handler
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virtual bool handler() = 0;
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// waits for the handler to be processed
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void wait() const { barrier.wait(); }
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protected:
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virtual ~MessageBase();
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private:
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virtual void handleMessage(const Message& message);
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mutable Barrier barrier;
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};
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// ---------------------------------------------------------------------------
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class MessageQueue {
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sp<Looper> mLooper;
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volatile int32_t mWorkPending;
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public:
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MessageQueue();
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~MessageQueue();
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void waitMessage();
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status_t postMessage(const sp<MessageBase>& message, nsecs_t reltime=0);
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status_t invalidate();
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};
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// ---------------------------------------------------------------------------
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}; // namespace android
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#endif /* ANDROID_MESSAGE_QUEUE_H */
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