| 1 | //===-- atomic_flag_test_and_set.c ----------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file implements atomic_flag_test_and_set from C11's stdatomic.h. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |
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| 13 | #ifndef __has_include |
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| 14 | #define __has_include(inc) 0 |
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| 15 | #endif |
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| 16 | |
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| 17 | #if __has_include(<stdatomic.h>) |
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| 18 | |
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| 19 | #include <stdatomic.h> |
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| 20 | #undef atomic_flag_test_and_set |
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| 21 | _Bool atomic_flag_test_and_set(volatile atomic_flag *object) { |
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| 22 | return __c11_atomic_exchange(&(object)->_Value, 1, __ATOMIC_SEQ_CST); |
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| 23 | } |
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| 24 | |
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| 25 | #endif |
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| 26 | |
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