1 #ifndef _DESPINBARRIER_HPP
2 #define _DESPINBARRIER_HPP
3 /*-------------------------------------------------------------------------
4  * drawElements C++ Base Library
5  * -----------------------------
6  *
7  * Copyright 2015 The Android Open Source Project
8  *
9  * Licensed under the Apache License, Version 2.0 (the "License");
10  * you may not use this file except in compliance with the License.
11  * You may obtain a copy of the License at
12  *
13  *      http://www.apache.org/licenses/LICENSE-2.0
14  *
15  * Unless required by applicable law or agreed to in writing, software
16  * distributed under the License is distributed on an "AS IS" BASIS,
17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18  * See the License for the specific language governing permissions and
19  * limitations under the License.
20  *
21  *//*!
22  * \file
23  * \brief Cross-thread barrier.
24  *//*--------------------------------------------------------------------*/
25 
26 #include "deDefs.hpp"
27 #include "deAtomic.h"
28 
29 namespace de
30 {
31 
32 /*--------------------------------------------------------------------*//*!
33  * \brief Cross-thread barrier
34  *
35  * SpinBarrier provides barrier implementation that uses spin loop for
36  * waiting for other threads. Threads may choose to wait in tight loop
37  * (WAIT_MODE_BUSY) or yield between iterations (WAIT_MODE_YIELD).
38  *//*--------------------------------------------------------------------*/
39 class SpinBarrier
40 {
41 public:
42 	enum WaitMode
43 	{
44 		WAIT_MODE_BUSY = 0,
45 		WAIT_MODE_YIELD,
46 
47 		WAIT_MODE_LAST
48 	};
49 
50 						SpinBarrier		(deInt32 numThreads);
51 						~SpinBarrier	(void);
52 
53 	void				sync			(WaitMode mode);
54 
55 private:
56 						SpinBarrier		(const SpinBarrier&);
57 	SpinBarrier			operator=		(const SpinBarrier&);
58 
59 	const deInt32		m_numThreads;
60 	volatile deInt32	m_numEntered;
61 	volatile deInt32	m_numLeaving;
62 };
63 
64 void	SpinBarrier_selfTest	(void);
65 
66 } // de
67 
68 #endif // _DESPINBARRIER_HPP
69