/*

 * Copyright (C) 2008, 2009 Apple Inc. 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 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.

 */

#include "config.h"

#include "Threading.h"

#include <string.h>

namespace WTF {

struct NewThreadContext : FastAllocBase {

    NewThreadContext(ThreadFunction entryPoint, void* data, const char* name)

        : entryPoint(entryPoint)

        , data(data)

        , name(name)

    {

    }

    ThreadFunction entryPoint;

    void* data;

    const char* name;

    Mutex creationMutex;

};

static void* threadEntryPoint(void* contextData)

{

    NewThreadContext* context = reinterpret_cast<NewThreadContext*>(contextData);

    // Block until our creating thread has completed any extra setup work, including

    // establishing ThreadIdentifier.

    {

        MutexLocker locker(context->creationMutex);

    }

    initializeCurrentThreadInternal(context->name);

    // Grab the info that we need out of the context, then deallocate it.

    ThreadFunction entryPoint = context->entryPoint;

    void* data = context->data;

    delete context;

    return entryPoint(data);

}

ThreadIdentifier createThread(ThreadFunction entryPoint, void* data, const char* name)

{

    // Visual Studio has a 31-character limit on thread names. Longer names will

    // be truncated silently, but we'd like callers to know about the limit.

#if !LOG_DISABLED

    if (strlen(name) > 31)

        LOG_ERROR("Thread name \"%s\" is longer than 31 characters and will be truncated by Visual Studio", name);

#endif

    NewThreadContext* context = new NewThreadContext(entryPoint, data, name);

    // Prevent the thread body from executing until we've established the thread identifier.

    MutexLocker locker(context->creationMutex);

    return createThreadInternal(threadEntryPoint, context, name);

}

#if PLATFORM(MAC) || PLATFORM(WIN)

// This function is deprecated but needs to be kept around for backward

// compatibility. Use the 3-argument version of createThread above.

ThreadIdentifier createThread(ThreadFunction entryPoint, void* data);

ThreadIdentifier createThread(ThreadFunction entryPoint, void* data)

{

    return createThread(entryPoint, data, 0);

}

#endif

} // namespace WTF