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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 |