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119 lines
3.0 KiB
119 lines
3.0 KiB
13 years ago
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/*
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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/List.h>
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#include "Barrier.h"
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namespace android {
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class MessageBase;
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class MessageList
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{
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List< sp<MessageBase> > mList;
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typedef List< sp<MessageBase> > LIST;
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public:
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inline LIST::iterator begin() { return mList.begin(); }
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inline LIST::const_iterator begin() const { return mList.begin(); }
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inline LIST::iterator end() { return mList.end(); }
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inline LIST::const_iterator end() const { return mList.end(); }
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inline bool isEmpty() const { return mList.empty(); }
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void insert(const sp<MessageBase>& node);
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void remove(LIST::iterator pos);
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};
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class MessageBase :
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public LightRefBase<MessageBase>
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{
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public:
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nsecs_t when;
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uint32_t what;
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int32_t arg0;
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MessageBase() : when(0), what(0), arg0(0) { }
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MessageBase(uint32_t what, int32_t arg0=0)
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: when(0), what(what), arg0(arg0) { }
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// return true if message has a handler
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virtual bool handler() { return false; }
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// waits for the handler to be processed
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void wait() const { barrier.wait(); }
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// releases all waiters. this is done automatically if
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// handler returns true
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void notify() const { barrier.open(); }
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protected:
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virtual ~MessageBase() { }
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private:
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mutable Barrier barrier;
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friend class LightRefBase<MessageBase>;
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};
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inline bool operator < (const MessageBase& lhs, const MessageBase& rhs) {
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return lhs.when < rhs.when;
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}
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class MessageQueue
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{
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typedef List< sp<MessageBase> > LIST;
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public:
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MessageQueue();
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~MessageQueue();
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// pre-defined messages
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enum {
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INVALIDATE = '_upd'
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};
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sp<MessageBase> waitMessage(nsecs_t timeout = -1);
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status_t postMessage(const sp<MessageBase>& message,
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nsecs_t reltime=0, uint32_t flags = 0);
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status_t invalidate();
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void dump(const sp<MessageBase>& message);
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private:
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status_t queueMessage(const sp<MessageBase>& message,
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nsecs_t reltime, uint32_t flags);
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void dumpLocked(const sp<MessageBase>& message);
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Mutex mLock;
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Condition mCondition;
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MessageList mMessages;
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bool mInvalidate;
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sp<MessageBase> mInvalidateMessage;
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};
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}; // namespace android
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#endif /* ANDROID_MESSAGE_QUEUE_H */
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