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 ParallelJobs_h
29#define ParallelJobs_h
30
31#include <wtf/Assertions.h>
32#include <wtf/Noncopyable.h>
33#include <wtf/RefPtr.h>
34#include <wtf/Vector.h>
35
36// Usage:
37//
38//     // Initialize parallel jobs
39//     ParallelJobs<TypeOfParameter> parallelJobs(&worker [, requestedNumberOfJobs]);
40//
41//     // Fill the parameter array
42//     for(i = 0; i < parallelJobs.numberOfJobs(); ++i) {
43//       TypeOfParameter& params = parallelJobs.parameter(i);
44//       params.attr1 = localVars ...
45//       ...
46//     }
47//
48//     // Execute parallel jobs
49//     parallelJobs.execute();
50//
51
52#if ENABLE(THREADING_GENERIC)
53#include <wtf/ParallelJobsGeneric.h>
54
55#elif ENABLE(THREADING_OPENMP)
56#include <wtf/ParallelJobsOpenMP.h>
57
58#elif ENABLE(THREADING_LIBDISPATCH)
59#include <wtf/ParallelJobsLibdispatch.h>
60
61#else
62#error "No parallel processing API for ParallelJobs"
63
64#endif
65
66namespace WTF {
67
68template<typename Type>
69class ParallelJobs {
70    WTF_MAKE_FAST_ALLOCATED;
71public:
72    typedef void (*WorkerFunction)(Type*);
73
74    ParallelJobs(WorkerFunction func, int requestedJobNumber) :
75        m_parallelEnvironment(reinterpret_cast<ParallelEnvironment::ThreadFunction>(func), sizeof(Type), requestedJobNumber)
76    {
77        m_parameters.grow(m_parallelEnvironment.numberOfJobs());
78        ASSERT(numberOfJobs() == m_parameters.size());
79    }
80
81    size_t numberOfJobs()
82    {
83        return m_parameters.size();
84    }
85
86    Type& parameter(size_t i)
87    {
88        return m_parameters[i];
89    }
90
91    void execute()
92    {
93        m_parallelEnvironment.execute(reinterpret_cast<unsigned char*>(m_parameters.data()));
94    }
95
96private:
97    ParallelEnvironment m_parallelEnvironment;
98    Vector<Type> m_parameters;
99};
100
101} // namespace WTF
102
103using WTF::ParallelJobs;
104
105#endif // ParallelJobs_h
106