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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "platform/WebThreadSupportingGC.h"
#include "platform/heap/SafePoint.h"
#include "public/platform/WebScheduler.h"
#include "wtf/PtrUtil.h"
#include "wtf/Threading.h"
#include <memory>
namespace blink {
std::unique_ptr<WebThreadSupportingGC> WebThreadSupportingGC::create(
const char* name) {
return WTF::wrapUnique(new WebThreadSupportingGC(name, nullptr));
}
std::unique_ptr<WebThreadSupportingGC> WebThreadSupportingGC::createForThread(
WebThread* thread) {
return WTF::wrapUnique(new WebThreadSupportingGC(nullptr, thread));
}
WebThreadSupportingGC::WebThreadSupportingGC(const char* name,
WebThread* thread)
: m_thread(thread) {
DCHECK(!name || !thread);
#if DCHECK_IS_ON()
// We call this regardless of whether an existing thread is given or not,
// as it means that blink is going to run with more than one thread.
WTF::willCreateThread();
#endif
if (!m_thread) {
// If |thread| is not given, create a new one and own it.
m_owningThread = WTF::wrapUnique(Platform::current()->createThread(name));
m_thread = m_owningThread.get();
}
}
WebThreadSupportingGC::~WebThreadSupportingGC() {
if (ThreadState::current() && m_owningThread) {
// WebThread's destructor blocks until all the tasks are processed.
SafePointScope scope(BlinkGC::HeapPointersOnStack);
m_owningThread.reset();
}
}
void WebThreadSupportingGC::initialize() {
ThreadState::attachCurrentThread();
m_gcTaskRunner = WTF::makeUnique<GCTaskRunner>(m_thread);
}
void WebThreadSupportingGC::shutdown() {
#if defined(LEAK_SANITIZER)
ThreadState::current()->releaseStaticPersistentNodes();
#endif
// Ensure no posted tasks will run from this point on.
m_gcTaskRunner.reset();
// Shutdown the thread (via its scheduler) only when the thread is created
// and is owned by this instance.
if (m_owningThread)
m_owningThread->scheduler()->shutdown();
ThreadState::detachCurrentThread();
}
} // namespace blink
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