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// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_HEAP_PARALLEL_WORK_ITEM_H_
#define V8_HEAP_PARALLEL_WORK_ITEM_H_
#include <atomic>
namespace v8 {
namespace internal {
class ParallelWorkItem {
public:
ParallelWorkItem() = default;
bool TryAcquire() {
// memory_order_relaxed is sufficient as the work item's state itself hasn't
// been modified since the beginning of its associated job. This is only
// atomically acquiring the right to work on it.
return reinterpret_cast<std::atomic<bool>*>(&acquire_)->exchange(
true, std::memory_order_relaxed) == false;
}
bool IsAcquired() const {
return reinterpret_cast<const std::atomic<bool>*>(&acquire_)->load(
std::memory_order_relaxed);
}
private:
bool acquire_{false};
};
} // namespace internal
} // namespace v8
#endif // V8_HEAP_PARALLEL_WORK_ITEM_H_
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