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/*
* 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 <wtf/OwnPtr.h>
#include <wtf/PassOwnPtr.h>
#include <string.h>
namespace WTF {
struct NewThreadContext {
WTF_MAKE_FAST_ALLOCATED;
public:
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;
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)
// For ABI compatibility with Safari on Mac / Windows: Safari uses the private
// createThread() and waitForThreadCompletion() functions directly and we need
// to keep the old ABI compatibility until it's been rebuilt.
typedef void* (*ThreadFunctionWithReturnValue)(void* argument);
WTF_EXPORT_PRIVATE ThreadIdentifier createThread(ThreadFunctionWithReturnValue entryPoint, void* data, const char* name);
struct ThreadFunctionWithReturnValueInvocation {
ThreadFunctionWithReturnValueInvocation(ThreadFunctionWithReturnValue function, void* data)
: function(function)
, data(data)
{
}
ThreadFunctionWithReturnValue function;
void* data;
};
static void compatEntryPoint(void* param)
{
// Balanced by .leakPtr() in createThread.
OwnPtr<ThreadFunctionWithReturnValueInvocation> invocation = adoptPtr(static_cast<ThreadFunctionWithReturnValueInvocation*>(param));
invocation->function(invocation->data);
}
ThreadIdentifier createThread(ThreadFunctionWithReturnValue entryPoint, void* data, const char* name)
{
OwnPtr<ThreadFunctionWithReturnValueInvocation> invocation = adoptPtr(new ThreadFunctionWithReturnValueInvocation(entryPoint, data));
// Balanced by adoptPtr() in compatEntryPoint.
return createThread(compatEntryPoint, invocation.leakPtr(), name);
}
WTF_EXPORT_PRIVATE int waitForThreadCompletion(ThreadIdentifier, void**);
int waitForThreadCompletion(ThreadIdentifier threadID, void**)
{
return waitForThreadCompletion(threadID);
}
// This function is deprecated but needs to be kept around for backward
// compatibility. Use the 3-argument version of createThread above.
WTF_EXPORT_PRIVATE ThreadIdentifier createThread(ThreadFunctionWithReturnValue entryPoint, void* data);
ThreadIdentifier createThread(ThreadFunctionWithReturnValue entryPoint, void* data)
{
OwnPtr<ThreadFunctionWithReturnValueInvocation> invocation = adoptPtr(new ThreadFunctionWithReturnValueInvocation(entryPoint, data));
// Balanced by adoptPtr() in compatEntryPoint.
return createThread(compatEntryPoint, invocation.leakPtr(), 0);
}
#endif
} // namespace WTF
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