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Update ELF Tool Chain to upstream r3520
[FreeBSD/FreeBSD.git] / contrib / compiler-rt / lib / builtins / atomic_flag_test_and_set.c
1 /*===-- atomic_flag_test_and_set.c ------------------------------------------===
2  *
3  *                     The LLVM Compiler Infrastructure
4  *
5  * This file is dual licensed under the MIT and the University of Illinois Open
6  * Source Licenses. See LICENSE.TXT for details.
7  *
8  *===------------------------------------------------------------------------===
9  *
10  * This file implements atomic_flag_test_and_set from C11's stdatomic.h.
11  *
12  *===------------------------------------------------------------------------===
13  */
14
15 #ifndef __has_include
16 #define __has_include(inc) 0
17 #endif
18
19 #if __has_include(<stdatomic.h>)
20
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);
25 }
26
27 #endif