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
36namespace WTF {
37
38class ParallelEnvironment {
39    WTF_MAKE_FAST_ALLOCATED;
40public:
41    typedef void (*ThreadFunction)(void*);
42
43    WTF_EXPORT_PRIVATE ParallelEnvironment(ThreadFunction, size_t sizeOfParameter, int requestedJobNumber);
44
45    int numberOfJobs()
46    {
47        return m_numberOfJobs;
48    }
49
50    WTF_EXPORT_PRIVATE void execute(void* parameters);
51
52    class ThreadPrivate : public RefCounted<ThreadPrivate> {
53    public:
54        ThreadPrivate()
55            : m_threadID(0)
56            , m_running(false)
57            , m_parent(0)
58        {
59        }
60
61        bool tryLockFor(ParallelEnvironment*);
62
63        void execute(ThreadFunction, void*);
64
65        void waitForFinish();
66
67        static PassRefPtr<ThreadPrivate> create()
68        {
69            return adoptRef(new ThreadPrivate());
70        }
71
72        static void workerThread(void*);
73
74    private:
75        ThreadIdentifier m_threadID;
76        bool m_running;
77        ParallelEnvironment* m_parent;
78
79        mutable Mutex m_mutex;
80        ThreadCondition m_threadCondition;
81
82        ThreadFunction m_threadFunction;
83        void* m_parameters;
84    };
85
86private:
87    ThreadFunction m_threadFunction;
88    size_t m_sizeOfParameter;
89    int m_numberOfJobs;
90
91    Vector< RefPtr<ThreadPrivate> > m_threads;
92    static Vector< RefPtr<ThreadPrivate> >* s_threadPool;
93};
94
95} // namespace WTF
96
97#endif // ENABLE(THREADING_GENERIC)
98
99
100#endif // ParallelJobsGeneric_h
101