1 //===-- atomic_flag_test_and_set.c ----------------------------------------===//
2 //
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
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements atomic_flag_test_and_set from C11's stdatomic.h.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef __has_include
14 #define __has_include(inc) 0
15 #endif
16 
17 #if __has_include(<stdatomic.h>)
18 
19 #include <stdatomic.h>
20 #undef atomic_flag_test_and_set
atomic_flag_test_and_set(volatile atomic_flag * object)21 _Bool atomic_flag_test_and_set(volatile atomic_flag *object) {
22   return __c11_atomic_exchange(&(object)->_Value, 1, __ATOMIC_SEQ_CST);
23 }
24 
25 #endif
26