JavaScriptCore-903.tar.gz

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

diff --git a/wtf/ParallelJobsGeneric.cpp b/wtf/ParallelJobsGeneric.cpp
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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.
+ */
+
+#include "config.h"
+
+#if ENABLE(PARALLEL_JOBS) && ENABLE(THREADING_GENERIC)
+
+#include "ParallelJobs.h"
+
+namespace WTF {
+
+Vector< RefPtr<ParallelEnvironment::ThreadPrivate> >* ParallelEnvironment::s_threadPool = 0;
+
+bool ParallelEnvironment::ThreadPrivate::tryLockFor(ParallelEnvironment* parent)
+{
+    bool locked = m_mutex.tryLock();
+
+    if (!locked)
+        return false;
+
+    if (m_parent) {
+        m_mutex.unlock();
+        return false;
+    }
+
+    if (!m_threadID)
+        m_threadID = createThread(&ParallelEnvironment::ThreadPrivate::workerThread, this, "Parallel worker");
+
+    if (m_threadID)
+        m_parent = parent;
+
+    m_mutex.unlock();
+    return m_threadID;
+}
+
+void ParallelEnvironment::ThreadPrivate::execute(ThreadFunction threadFunction, void* parameters)
+{
+    MutexLocker lock(m_mutex);
+
+    m_threadFunction = threadFunction;
+    m_parameters = parameters;
+    m_running = true;
+    m_threadCondition.signal();
+}
+
+void ParallelEnvironment::ThreadPrivate::waitForFinish()
+{
+    MutexLocker lock(m_mutex);
+
+    while (m_running)
+        m_threadCondition.wait(m_mutex);
+}
+
+void* ParallelEnvironment::ThreadPrivate::workerThread(void* threadData)
+{
+    ThreadPrivate* sharedThread = reinterpret_cast<ThreadPrivate*>(threadData);
+    MutexLocker lock(sharedThread->m_mutex);
+
+    while (sharedThread->m_threadID) {
+        if (sharedThread->m_running) {
+            (*sharedThread->m_threadFunction)(sharedThread->m_parameters);
+            sharedThread->m_running = false;
+            sharedThread->m_parent = 0;
+            sharedThread->m_threadCondition.signal();
+        }
+
+        sharedThread->m_threadCondition.wait(sharedThread->m_mutex);
+    }
+    return 0;
+}
+
+} // namespace WTF
+
+#endif // ENABLE(PARALLEL_JOBS) && ENABLE(THREADING_GENERIC)