10b57cec5SDimitry Andric //===-- atomic_flag_test_and_set.c ----------------------------------------===// 20b57cec5SDimitry Andric // 30b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 40b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 50b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 60b57cec5SDimitry Andric // 70b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 80b57cec5SDimitry Andric // 90b57cec5SDimitry Andric // This file implements atomic_flag_test_and_set from C11's stdatomic.h. 100b57cec5SDimitry Andric // 110b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 120b57cec5SDimitry Andric 130b57cec5SDimitry Andric #ifndef __has_include 140b57cec5SDimitry Andric #define __has_include(inc) 0 150b57cec5SDimitry Andric #endif 160b57cec5SDimitry Andric 170b57cec5SDimitry Andric #if __has_include(<stdatomic.h>) 180b57cec5SDimitry Andric 190b57cec5SDimitry Andric #include <stdatomic.h> 200b57cec5SDimitry Andric #undef atomic_flag_test_and_set atomic_flag_test_and_set(volatile atomic_flag * object)210b57cec5SDimitry Andric_Bool atomic_flag_test_and_set(volatile atomic_flag *object) { 220b57cec5SDimitry Andric return __c11_atomic_exchange(&(object)->_Value, 1, __ATOMIC_SEQ_CST); 230b57cec5SDimitry Andric } 240b57cec5SDimitry Andric 250b57cec5SDimitry Andric #endif 26