lock.hpp

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//   ___ __  __ ___ 
//  / __|  \/  | _ \ GMP(Generative Metaprogramming)
// | (_ | |\/| |  _/ version 0.3.0
//  \___|_|  |_|_|   https://github.com/lkimuk/gmp
//
// SPDX-FileCopyrightText: 2020-2026 Miles Li <https://www.cppmore.com/>
// SPDX-License-Identifier: MIT
//
// This file is part of the GMP (Generative Metaprogramming) library.
// Full project source: https://github.com/lkimuk/gmp
//
// This spin lock implementation was originally written by the same author
// for the okdp library in 2020 and later adapted for GMP:
// https://github.com/lkimuk/okdp
 
#ifndef GMP_DP_LOCK_HPP_
#define GMP_DP_LOCK_HPP_
 
#include <atomic>
 
namespace gmp::dp {
 
class spin_lock {
private:
  std::atomic_flag flag_ = ATOMIC_FLAG_INIT;
 
public:
  void lock() {
    while (flag_.test_and_set(std::memory_order_acquire));
  }
 
  void unlock() {
    flag_.clear(std::memory_order_release);
  }
};
 
} // namespace gmp::dp
 
#endif // GMP_DP_LOCK_HPP_