1 /*===-- atomic_flag_test_and_set.c ------------------------------------------===
3 * The LLVM Compiler Infrastructure
5 * This file is dual licensed under the MIT and the University of Illinois Open
6 * Source Licenses. See LICENSE.TXT for details.
8 *===------------------------------------------------------------------------===
10 * This file implements atomic_flag_test_and_set from C11's stdatomic.h.
12 *===------------------------------------------------------------------------===
16 #define __has_include(inc) 0
19 #if __has_include(<stdatomic.h>)
21 #include <stdatomic.h>
22 #undef atomic_flag_test_and_set
23 _Bool atomic_flag_test_and_set(volatile atomic_flag *object) {
24 return __c11_atomic_exchange(&(object)->_Value, 1, __ATOMIC_SEQ_CST);