1/*
2 * Copyright (C) 2011 University of Szeged
3 * Copyright (C) 2011 Gabor Loki <loki@webkit.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY UNIVERSITY OF SZEGED ``AS IS'' AND ANY
16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL UNIVERSITY OF SZEGED OR
19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
22 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
23 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#ifndef ParallelJobsGeneric_h
29#define ParallelJobsGeneric_h
30
31#if ENABLE(THREADING_GENERIC)
32
33#include "wtf/RefCounted.h"
34#include "wtf/Threading.h"
35#include "wtf/WTFExport.h"
36
37namespace WTF {
38
39class WTF_EXPORT ParallelEnvironment {
40    WTF_MAKE_FAST_ALLOCATED;
41public:
42    typedef void (*ThreadFunction)(void*);
43
44    ParallelEnvironment(ThreadFunction, size_t sizeOfParameter, int requestedJobNumber);
45
46    int numberOfJobs()
47    {
48        return m_numberOfJobs;
49    }
50
51    void execute(void* parameters);
52
53    class ThreadPrivate : public RefCounted<ThreadPrivate> {
54    public:
55        ThreadPrivate()
56            : m_threadID(0)
57            , m_running(false)
58            , m_parent(0)
59        {
60        }
61
62        bool tryLockFor(ParallelEnvironment*);
63
64        void execute(ThreadFunction, void*);
65
66        void waitForFinish();
67
68        static PassRefPtr<ThreadPrivate> create()
69        {
70            return adoptRef(new ThreadPrivate());
71        }
72
73        static void workerThread(void*);
74
75    private:
76        ThreadIdentifier m_threadID;
77        bool m_running;
78        ParallelEnvironment* m_parent;
79
80        mutable Mutex m_mutex;
81        ThreadCondition m_threadCondition;
82
83        ThreadFunction m_threadFunction;
84        void* m_parameters;
85    };
86
87private:
88    ThreadFunction m_threadFunction;
89    size_t m_sizeOfParameter;
90    int m_numberOfJobs;
91
92    Vector< RefPtr<ThreadPrivate> > m_threads;
93    static Vector< RefPtr<ThreadPrivate> >* s_threadPool;
94};
95
96} // namespace WTF
97
98#endif // ENABLE(THREADING_GENERIC)
99
100
101#endif // ParallelJobsGeneric_h
102