1 //===-- atomic_flag_test_and_set.c ----------------------------------------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This file implements atomic_flag_test_and_set from C11's stdatomic.h.
11 //===----------------------------------------------------------------------===//
14 #define __has_include(inc) 0
17 #if __has_include(<stdatomic.h>)
19 #include <stdatomic.h>
20 #undef atomic_flag_test_and_set
21 _Bool atomic_flag_test_and_set(volatile atomic_flag *object) {
22 return __c11_atomic_exchange(&(object)->_Value, 1, __ATOMIC_SEQ_CST);