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/*
* Copyright (C) 2009, 2011 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 INC. ``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 INC. 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 "GCThreadSharedData.h"
#include "JSGlobalData.h"
#include "MarkStack.h"
#include "SlotVisitor.h"
#include "SlotVisitorInlineMethods.h"
#include <wtf/MainThread.h>
namespace JSC {
#if ENABLE(PARALLEL_GC)
void GCThreadSharedData::resetChildren()
{
for (unsigned i = 0; i < m_markingThreadsMarkStack.size(); ++i)
m_markingThreadsMarkStack[i]->reset();
}
size_t GCThreadSharedData::childVisitCount()
{
unsigned long result = 0;
for (unsigned i = 0; i < m_markingThreadsMarkStack.size(); ++i)
result += m_markingThreadsMarkStack[i]->visitCount();
return result;
}
void GCThreadSharedData::markingThreadMain(SlotVisitor* slotVisitor)
{
WTF::registerGCThread();
{
ParallelModeEnabler enabler(*slotVisitor);
slotVisitor->drainFromShared(SlotVisitor::SlaveDrain);
}
delete slotVisitor;
}
void GCThreadSharedData::markingThreadStartFunc(void* myVisitor)
{
SlotVisitor* slotVisitor = static_cast<SlotVisitor*>(myVisitor);
slotVisitor->sharedData().markingThreadMain(slotVisitor);
}
#endif
GCThreadSharedData::GCThreadSharedData(JSGlobalData* globalData)
: m_globalData(globalData)
, m_copiedSpace(&globalData->heap.m_storageSpace)
, m_shouldHashConst(false)
, m_sharedMarkStack(m_segmentAllocator)
, m_numberOfActiveParallelMarkers(0)
, m_parallelMarkersShouldExit(false)
{
#if ENABLE(PARALLEL_GC)
for (unsigned i = 1; i < Options::numberOfGCMarkers(); ++i) {
SlotVisitor* slotVisitor = new SlotVisitor(*this);
m_markingThreadsMarkStack.append(slotVisitor);
m_markingThreads.append(createThread(markingThreadStartFunc, slotVisitor, "JavaScriptCore::Marking"));
ASSERT(m_markingThreads.last());
}
#endif
}
GCThreadSharedData::~GCThreadSharedData()
{
#if ENABLE(PARALLEL_GC)
// Destroy our marking threads.
{
MutexLocker locker(m_markingLock);
m_parallelMarkersShouldExit = true;
m_markingCondition.broadcast();
}
for (unsigned i = 0; i < m_markingThreads.size(); ++i)
waitForThreadCompletion(m_markingThreads[i]);
#endif
}
void GCThreadSharedData::reset()
{
ASSERT(!m_numberOfActiveParallelMarkers);
ASSERT(!m_parallelMarkersShouldExit);
ASSERT(m_sharedMarkStack.isEmpty());
#if ENABLE(PARALLEL_GC)
m_segmentAllocator.shrinkReserve();
m_opaqueRoots.clear();
#else
ASSERT(m_opaqueRoots.isEmpty());
#endif
m_weakReferenceHarvesters.removeAll();
if (m_shouldHashConst) {
m_globalData->resetNewStringsSinceLastHashConst();
m_shouldHashConst = false;
}
}
} // namespace JSC
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