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// Copyright 2016 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/WaitableEvent.h"
#include "base/synchronization/waitable_event.h"
#include "platform/heap/SafePoint.h"
#include "platform/heap/ThreadState.h"
#include "wtf/Optional.h"
#include "wtf/PtrUtil.h"
#include <vector>
namespace blink {
WaitableEvent::WaitableEvent(ResetPolicy policy, InitialState state) {
m_impl = WTF::wrapUnique(new base::WaitableEvent(
policy == ResetPolicy::Manual
? base::WaitableEvent::ResetPolicy::MANUAL
: base::WaitableEvent::ResetPolicy::AUTOMATIC,
state == InitialState::Signaled
? base::WaitableEvent::InitialState::SIGNALED
: base::WaitableEvent::InitialState::NOT_SIGNALED));
}
WaitableEvent::~WaitableEvent() {}
void WaitableEvent::reset() {
m_impl->Reset();
}
void WaitableEvent::wait() {
if (ThreadState::current()) {
// We only enter a safe point scope if the thread is attached, ex. never
// during shutdown.
// TODO(esprehn): Why can't SafePointScope do this for us?
SafePointScope scope(BlinkGC::HeapPointersOnStack);
m_impl->Wait();
} else {
m_impl->Wait();
}
}
void WaitableEvent::signal() {
m_impl->Signal();
}
size_t WaitableEvent::waitMultiple(const WTF::Vector<WaitableEvent*>& events) {
std::vector<base::WaitableEvent*> baseEvents;
for (size_t i = 0; i < events.size(); ++i)
baseEvents.push_back(events[i]->m_impl.get());
size_t idx =
base::WaitableEvent::WaitMany(baseEvents.data(), baseEvents.size());
DCHECK_LT(idx, events.size());
return idx;
}
} // namespace blink
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