MessageQueue.h revision be902ac4
1/*
2 * Copyright 2001-2014 Haiku, Inc. All rights reserved.
3 * Distributed under the terms of the MIT License.
4 */
5#ifndef _MESSAGE_QUEUE_H
6#define _MESSAGE_QUEUE_H
7
8
9#include <Locker.h>
10#include <Message.h>
11	// For convenience
12
13
14class BMessageQueue {
15public:
16								BMessageQueue();
17	virtual						~BMessageQueue();
18
19			void				AddMessage(BMessage* message);
20			void				RemoveMessage(BMessage* message);
21
22			int32				CountMessages() const;
23			bool				IsEmpty() const;
24
25			BMessage*			FindMessage(int32 index) const;
26			BMessage*			FindMessage(uint32 what, int32 index = 0) const;
27
28			bool				Lock();
29			void				Unlock();
30			bool				IsLocked() const;
31
32			BMessage*			NextMessage();
33			bool				IsNextMessage(const BMessage* message) const;
34
35private:
36			// Reserved space in the vtable for future changes to BMessageQueue
37	virtual	void				_ReservedMessageQueue1();
38	virtual	void				_ReservedMessageQueue2();
39	virtual	void				_ReservedMessageQueue3();
40
41								BMessageQueue(const BMessageQueue &);
42			BMessageQueue&		operator=(const BMessageQueue &);
43
44			bool				IsLocked();
45				// this needs to be exported for R5 compatibility and should
46				// be dropped as soon as possible
47
48private:
49			BMessage*			fHead;
50			BMessage*			fTail;
51			int32				fMessageCount;
52	mutable	BLocker				fLock;
53
54			uint32				_reserved[3];
55};
56
57
58#endif	// _MESSAGE_QUEUE_H
59