JavaScriptCore-1097.3.tar.gz

[apple/javascriptcore.git] / wtf / ParallelJobsGeneric.h

diff --git a/wtf/ParallelJobsGeneric.h b/wtf/ParallelJobsGeneric.h
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--- a/wtf/ParallelJobsGeneric.h
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-/*
- * Copyright (C) 2011 University of Szeged
- * Copyright (C) 2011 Gabor Loki <loki@webkit.org>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY UNIVERSITY OF SZEGED ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL UNIVERSITY OF SZEGED OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef ParallelJobsGeneric_h
-#define ParallelJobsGeneric_h
-
-#if ENABLE(THREADING_GENERIC)
-
-#include <wtf/RefCounted.h>
-#include <wtf/Threading.h>
-
-namespace WTF {
-
-static const unsigned int maxParallelThreads = 2;
-
-class ParallelEnvironment {
-    WTF_MAKE_FAST_ALLOCATED;
-public:
-    typedef void (*ThreadFunction)(void*);
-
-    ParallelEnvironment(ThreadFunction threadFunction, size_t sizeOfParameter, unsigned int requestedJobNumber) :
-        m_threadFunction(threadFunction),
-        m_sizeOfParameter(sizeOfParameter)
-    {
-        if (!requestedJobNumber || requestedJobNumber > maxParallelThreads)
-            requestedJobNumber = maxParallelThreads;
-
-        if (!s_threadPool)
-            s_threadPool = new Vector< RefPtr<ThreadPrivate> >();
-
-        // The main thread should be also a worker.
-        unsigned int maxNewThreads = requestedJobNumber - 1;
-
-        for (unsigned int i = 0; i < maxParallelThreads && m_threads.size() < maxNewThreads; ++i) {
-            if (s_threadPool->size() < i + 1)
-                s_threadPool->append(ThreadPrivate::create());
-
-            if ((*s_threadPool)[i]->tryLockFor(this))
-                m_threads.append((*s_threadPool)[i]);
-        }
-
-        m_numberOfJobs = m_threads.size() + 1;
-    }
-
-    int numberOfJobs()
-    {
-        return m_numberOfJobs;
-    }
-
-    void execute(unsigned char* parameters)
-    {
-        size_t i;
-        for (i = 0; i < m_threads.size(); ++i) {
-            m_threads[i]->execute(m_threadFunction, parameters);
-            parameters += m_sizeOfParameter;
-        }
-
-        // The work for the main thread
-        (*m_threadFunction)(parameters);
-
-        // Wait until all jobs are done.
-        for (i = 0; i < m_threads.size(); ++i)
-            m_threads[i]->waitForFinish();
-    }
-
-    class ThreadPrivate : public RefCounted<ThreadPrivate> {
-    public:
-        ThreadPrivate()
-            : m_threadID(0)
-            , m_running(false)
-            , m_parent(0)
-        {
-        }
-
-        bool tryLockFor(ParallelEnvironment*);
-
-        void execute(ThreadFunction, void*);
-
-        void waitForFinish();
-
-        static PassRefPtr<ThreadPrivate> create()
-        {
-            return adoptRef(new ThreadPrivate());
-        }
-
-        static void* workerThread(void*);
-
-    private:
-        ThreadIdentifier m_threadID;
-        bool m_running;
-        ParallelEnvironment* m_parent;
-
-        mutable Mutex m_mutex;
-        ThreadCondition m_threadCondition;
-
-        ThreadFunction m_threadFunction;
-        void* m_parameters;
-    };
-
-private:
-    ThreadFunction m_threadFunction;
-    size_t m_sizeOfParameter;
-    int m_numberOfJobs;
-
-    Vector< RefPtr<ThreadPrivate> > m_threads;
-    static Vector< RefPtr<ThreadPrivate> >* s_threadPool;
-};
-
-} // namespace WTF
-
-#endif // ENABLE(THREADING_GENERIC)
-
-
-#endif // ParallelJobsGeneric_h