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/*
* Copyright (C) 2013 Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER 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"
#include "heap/ThreadState.h"
#include "wtf/ThreadingPrimitives.h"
namespace WebCore {
WTF::ThreadSpecific<ThreadState*>* ThreadState::s_threadSpecific = 0;
uint8_t ThreadState::s_mainThreadStateStorage[sizeof(ThreadState)];
static Mutex& threadAttachMutex()
{
AtomicallyInitializedStatic(Mutex&, mutex = *new Mutex);
return mutex;
}
void ThreadState::init(intptr_t* startOfStack)
{
s_threadSpecific = new WTF::ThreadSpecific<ThreadState*>();
new(s_mainThreadStateStorage) ThreadState(startOfStack);
attachedThreads().add(mainThreadState());
}
void ThreadState::shutdown()
{
mainThreadState()->~ThreadState();
}
void ThreadState::attach(intptr_t* startOfStack)
{
MutexLocker locker(threadAttachMutex());
ThreadState* state = new ThreadState(startOfStack);
attachedThreads().add(state);
}
void ThreadState::detach()
{
ThreadState* state = current();
MutexLocker locker(threadAttachMutex());
attachedThreads().remove(state);
delete state;
}
ThreadState::ThreadState(intptr_t* startOfStack)
: m_thread(currentThread())
, m_startOfStack(startOfStack)
{
ASSERT(!**s_threadSpecific);
**s_threadSpecific = this;
// FIXME: This is to silence clang that complains about unused private
// member. Remove once we implement stack scanning that uses it.
(void) m_startOfStack;
}
ThreadState::~ThreadState()
{
checkThread();
**s_threadSpecific = 0;
}
ThreadState::AttachedThreadStateSet& ThreadState::attachedThreads()
{
DEFINE_STATIC_LOCAL(AttachedThreadStateSet, threads, ());
return threads;
}
}
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