// 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; } private: bool acquire_{false}; }; } // namespace internal } // namespace v8 #endif // V8_HEAP_PARALLEL_WORK_ITEM_H_