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+/*
+ * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
+ * Copyright (C) 2007 Justin Haygood (jhaygood@reaktix.com)
+ *
+ * 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. 
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 APPLE OR ITS 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.
+ *
+ *
+ * Note: The implementations of InterlockedIncrement and InterlockedDecrement are based
+ * on atomic_increment and atomic_exchange_and_add from the Boost C++ Library. The license
+ * is virtually identical to the Apple license above but is included here for completeness.
+ *
+ * Boost Software License - Version 1.0 - August 17th, 2003
+ * 
+ * Permission is hereby granted, free of charge, to any person or organization
+ * obtaining a copy of the software and accompanying documentation covered by
+ * this license (the "Software") to use, reproduce, display, distribute,
+ * execute, and transmit the Software, and to prepare derivative works of the
+ * Software, and to permit third-parties to whom the Software is furnished to
+ * do so, all subject to the following:
+ * 
+ * The copyright notices in the Software and this entire statement, including
+ * the above license grant, this restriction and the following disclaimer,
+ * must be included in all copies of the Software, in whole or in part, and
+ * all derivative works of the Software, unless such copies or derivative
+ * works are solely in the form of machine-executable object code generated by
+ * a source language processor.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+ * SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+ * FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef Threading_h
+#define Threading_h
+
+#include <wtf/Assertions.h>
+#include <wtf/Locker.h>
+#include <wtf/Noncopyable.h>
+
+#if PLATFORM(WIN_OS)
+#include <windows.h>
+#elif PLATFORM(DARWIN)
+#include <libkern/OSAtomic.h>
+#elif defined ANDROID
+#include "cutils/atomic.h"
+#elif COMPILER(GCC)
+#if (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 2))
+#include <ext/atomicity.h>
+#else
+#include <bits/atomicity.h>
+#endif
+#endif
+
+#if USE(PTHREADS)
+#include <pthread.h>
+#elif PLATFORM(GTK)
+#include <wtf/GOwnPtr.h>
+typedef struct _GMutex GMutex;
+typedef struct _GCond GCond;
+#endif
+
+#if PLATFORM(QT)
+#include <qglobal.h>
+QT_BEGIN_NAMESPACE
+class QMutex;
+class QWaitCondition;
+QT_END_NAMESPACE
+#endif
+
+#include <stdint.h>
+
+// For portability, we do not use thread-safe statics natively supported by some compilers (e.g. gcc).
+#define AtomicallyInitializedStatic(T, name) \
+    WTF::lockAtomicallyInitializedStaticMutex(); \
+    static T name; \
+    WTF::unlockAtomicallyInitializedStaticMutex();
+
+namespace WTF {
+
+typedef uint32_t ThreadIdentifier;
+typedef void* (*ThreadFunction)(void* argument);
+
+// Returns 0 if thread creation failed
+ThreadIdentifier createThread(ThreadFunction, void*, const char* threadName);
+
+ThreadIdentifier currentThread();
+bool isMainThread();
+int waitForThreadCompletion(ThreadIdentifier, void**);
+void detachThread(ThreadIdentifier);
+
+#if USE(PTHREADS)
+typedef pthread_mutex_t PlatformMutex;
+typedef pthread_cond_t PlatformCondition;
+#elif PLATFORM(GTK)
+typedef GOwnPtr<GMutex> PlatformMutex;
+typedef GOwnPtr<GCond> PlatformCondition;
+#elif PLATFORM(QT)
+typedef QT_PREPEND_NAMESPACE(QMutex)* PlatformMutex;
+typedef QT_PREPEND_NAMESPACE(QWaitCondition)* PlatformCondition;
+#elif PLATFORM(WIN_OS)
+struct PlatformMutex {
+    CRITICAL_SECTION m_internalMutex;
+    size_t m_recursionCount;
+};
+struct PlatformCondition {
+    size_t m_timedOut;
+    size_t m_blocked;
+    size_t m_waitingForRemoval;
+    HANDLE m_gate;
+    HANDLE m_queue;
+    HANDLE m_mutex;
+};
+#else
+typedef void* PlatformMutex;
+typedef void* PlatformCondition;
+#endif
+    
+class Mutex : Noncopyable {
+public:
+    Mutex();
+    ~Mutex();
+
+    void lock();
+    bool tryLock();
+    void unlock();
+
+public:
+    PlatformMutex& impl() { return m_mutex; }
+private:
+    PlatformMutex m_mutex;
+};
+
+typedef Locker<Mutex> MutexLocker;
+
+class ThreadCondition : Noncopyable {
+public:
+    ThreadCondition();
+    ~ThreadCondition();
+    
+    void wait(Mutex& mutex);
+    // Returns true if the condition was signaled before the timeout, false if the timeout was reached
+    bool timedWait(Mutex&, double interval);
+    void signal();
+    void broadcast();
+    
+private:
+    PlatformCondition m_condition;
+};
+
+#if PLATFORM(WIN_OS)
+#define WTF_USE_LOCKFREE_THREADSAFESHARED 1
+
+#if COMPILER(MINGW) || COMPILER(MSVC7)
+inline void atomicIncrement(int* addend) { InterlockedIncrement(reinterpret_cast<long*>(addend)); }
+inline int atomicDecrement(int* addend) { return InterlockedDecrement(reinterpret_cast<long*>(addend)); }
+#else
+inline void atomicIncrement(int volatile* addend) { InterlockedIncrement(reinterpret_cast<long volatile*>(addend)); }
+inline int atomicDecrement(int volatile* addend) { return InterlockedDecrement(reinterpret_cast<long volatile*>(addend)); }
+#endif
+
+#elif PLATFORM(DARWIN)
+#define WTF_USE_LOCKFREE_THREADSAFESHARED 1
+
+inline void atomicIncrement(int volatile* addend) { OSAtomicIncrement32Barrier(const_cast<int*>(addend)); }
+inline int atomicDecrement(int volatile* addend) { return OSAtomicDecrement32Barrier(const_cast<int*>(addend)); }
+
+#elif defined ANDROID
+
+inline void atomicIncrement(int volatile* addend) { android_atomic_inc(addend); }
+inline int atomicDecrement(int volatile* addend) { return android_atomic_dec(addend); }
+
+#elif COMPILER(GCC)
+#define WTF_USE_LOCKFREE_THREADSAFESHARED 1
+
+inline void atomicIncrement(int volatile* addend) { __gnu_cxx::__atomic_add(addend, 1); }
+inline int atomicDecrement(int volatile* addend) { return __gnu_cxx::__exchange_and_add(addend, -1) - 1; }
+
+#endif
+
+template<class T> class ThreadSafeShared : Noncopyable {
+public:
+    ThreadSafeShared(int initialRefCount = 1)
+        : m_refCount(initialRefCount)
+    {
+    }
+
+    void ref()
+    {
+#if USE(LOCKFREE_THREADSAFESHARED)
+        atomicIncrement(&m_refCount);
+#else
+        MutexLocker locker(m_mutex);
+        ++m_refCount;
+#endif
+    }
+
+    void deref()
+    {
+#if USE(LOCKFREE_THREADSAFESHARED)
+        if (atomicDecrement(&m_refCount) <= 0)
+#else
+        {
+            MutexLocker locker(m_mutex);
+            --m_refCount;
+        }
+        if (m_refCount <= 0)
+#endif
+            delete static_cast<T*>(this);
+    }
+
+    bool hasOneRef()
+    {
+        return refCount() == 1;
+    }
+
+    int refCount() const
+    {
+#if !USE(LOCKFREE_THREADSAFESHARED)
+        MutexLocker locker(m_mutex);
+#endif
+        return static_cast<int const volatile &>(m_refCount);
+    }
+
+private:
+    int m_refCount;
+#if !USE(LOCKFREE_THREADSAFESHARED)
+    mutable Mutex m_mutex;
+#endif
+};
+
+// This function must be called from the main thread. It is safe to call it repeatedly.
+// Darwin is an exception to this rule: it is OK to call it from any thread, the only requirement is that the calls are not reentrant.
+void initializeThreading();
+
+#if !PLATFORM(WIN_OS) || PLATFORM(WX)
+extern Mutex* atomicallyInitializedStaticMutex;
+inline void lockAtomicallyInitializedStaticMutex() { atomicallyInitializedStaticMutex->lock(); }
+inline void unlockAtomicallyInitializedStaticMutex() { atomicallyInitializedStaticMutex->unlock(); }
+#else
+void lockAtomicallyInitializedStaticMutex();
+void unlockAtomicallyInitializedStaticMutex();
+#endif
+
+} // namespace WTF
+
+using WTF::Mutex;
+using WTF::MutexLocker;
+using WTF::ThreadCondition;
+using WTF::ThreadIdentifier;
+using WTF::ThreadSafeShared;
+
+using WTF::createThread;
+using WTF::currentThread;
+using WTF::isMainThread;
+using WTF::detachThread;
+using WTF::waitForThreadCompletion;
+
+#endif // Threading_h