blob: 443938295f4e1c29dd0486b431ba7fea3529d16d [file] [log] [blame]
/*
* Copyright (C) 2008 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 "StorageThread.h"
#include <wtf/AutodrainedPool.h>
#include <wtf/HashSet.h>
#include <wtf/MainThread.h>
#include <wtf/NeverDestroyed.h>
namespace WebCore {
static HashSet<StorageThread*>& activeStorageThreads()
{
ASSERT(isMainThread());
static NeverDestroyed<HashSet<StorageThread*>> threads;
return threads;
}
StorageThread::StorageThread()
{
ASSERT(isMainThread());
}
StorageThread::~StorageThread()
{
ASSERT(isMainThread());
ASSERT(!m_thread);
}
void StorageThread::start()
{
ASSERT(isMainThread());
if (!m_thread) {
m_thread = Thread::create("WebCore: LocalStorage", [this] {
threadEntryPoint();
});
}
activeStorageThreads().add(this);
}
void StorageThread::threadEntryPoint()
{
ASSERT(!isMainThread());
while (auto function = m_queue.waitForMessage()) {
AutodrainedPool pool;
(*function)();
}
}
void StorageThread::dispatch(Function<void ()>&& function)
{
ASSERT(isMainThread());
ASSERT(!m_queue.killed() && m_thread);
m_queue.append(std::make_unique<Function<void ()>>(WTFMove(function)));
}
void StorageThread::terminate()
{
ASSERT(isMainThread());
ASSERT(!m_queue.killed() && m_thread);
activeStorageThreads().remove(this);
// Even in weird, exceptional cases, don't wait on a nonexistent thread to terminate.
if (!m_thread)
return;
m_queue.append(std::make_unique<Function<void ()>>([this] {
performTerminate();
}));
m_thread->waitForCompletion();
ASSERT(m_queue.killed());
m_thread = nullptr;
}
void StorageThread::performTerminate()
{
ASSERT(!isMainThread());
m_queue.kill();
}
void StorageThread::releaseFastMallocFreeMemoryInAllThreads()
{
for (auto& thread : activeStorageThreads())
thread->dispatch(&WTF::releaseFastMallocFreeMemory);
}
}