haiku/headers/os/app/MessageQueue.h

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/*
* Copyright 2001-2005, Haiku, Inc. All Rights Reserved.
* Distributed under the terms of the MIT License.
*/
#ifndef _MESSAGE_QUEUE_H
#define _MESSAGE_QUEUE_H
#include <Locker.h>
#include <Message.h>
/* For convenience */
class BMessageQueue {
public:
BMessageQueue();
virtual ~BMessageQueue();
void AddMessage(BMessage* message);
void RemoveMessage(BMessage* message);
int32 CountMessages() const;
bool IsEmpty() const;
BMessage* FindMessage(int32 index) const;
BMessage* FindMessage(uint32 what, int32 index = 0) const;
bool Lock();
void Unlock();
bool IsLocked() const;
BMessage *NextMessage();
private:
// Reserved space in the vtable for future changes to BMessageQueue
virtual void _ReservedMessageQueue1();
virtual void _ReservedMessageQueue2();
virtual void _ReservedMessageQueue3();
BMessageQueue(const BMessageQueue &);
BMessageQueue &operator=(const BMessageQueue &);
bool IsLocked();
// this needs to be exported for R5 compatibility and should
// be dropped as soon as possible
private:
BMessage* fHead;
BMessage* fTail;
int32 fMessageCount;
mutable BLocker fLock;
uint32 _reserved[3];
};
#endif // _MESSAGE_QUEUE_H