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