llvm/compiler-rt/lib/builtins/atomic_flag_test_and_set_explicit.c

//===-- atomic_flag_test_and_set_explicit.c -------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements atomic_flag_test_and_set_explicit from C11's stdatomic.h
//
//===----------------------------------------------------------------------===//

#ifndef __has_include
#define __has_include(inc) 0
#endif

#if __has_include(<stdatomic.h>)

#include <stdatomic.h>
#undef atomic_flag_test_and_set_explicit
_Bool atomic_flag_test_and_set_explicit(volatile atomic_flag *object,
                                        memory_order order) {
  return __c11_atomic_exchange(&(object)->_Value, 1, order);
}

#endif