1 //===----------------------------------------------------------------------===// 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 // UNSUPPORTED: libcpp-has-no-threads 11 12 // <atomic> 13 14 // struct atomic_flag 15 16 // void atomic_flag_clear_explicit(volatile atomic_flag*, memory_order); 17 // void atomic_flag_clear_explicit(atomic_flag*, memory_order); 18 19 #include <atomic> 20 #include <cassert> 21 22 int main() 23 { 24 { 25 std::atomic_flag f; // uninitialized first 26 atomic_flag_clear_explicit(&f, std::memory_order_relaxed); 27 assert(f.test_and_set() == 0); 28 atomic_flag_clear_explicit(&f, std::memory_order_relaxed); 29 assert(f.test_and_set() == 0); 30 } 31 { 32 std::atomic_flag f; 33 atomic_flag_clear_explicit(&f, std::memory_order_release); 34 assert(f.test_and_set() == 0); 35 atomic_flag_clear_explicit(&f, std::memory_order_release); 36 assert(f.test_and_set() == 0); 37 } 38 { 39 std::atomic_flag f; 40 atomic_flag_clear_explicit(&f, std::memory_order_seq_cst); 41 assert(f.test_and_set() == 0); 42 atomic_flag_clear_explicit(&f, std::memory_order_seq_cst); 43 assert(f.test_and_set() == 0); 44 } 45 { 46 volatile std::atomic_flag f; 47 atomic_flag_clear_explicit(&f, std::memory_order_relaxed); 48 assert(f.test_and_set() == 0); 49 atomic_flag_clear_explicit(&f, std::memory_order_relaxed); 50 assert(f.test_and_set() == 0); 51 } 52 { 53 volatile std::atomic_flag f; 54 atomic_flag_clear_explicit(&f, std::memory_order_release); 55 assert(f.test_and_set() == 0); 56 atomic_flag_clear_explicit(&f, std::memory_order_release); 57 assert(f.test_and_set() == 0); 58 } 59 { 60 volatile std::atomic_flag f; 61 atomic_flag_clear_explicit(&f, std::memory_order_seq_cst); 62 assert(f.test_and_set() == 0); 63 atomic_flag_clear_explicit(&f, std::memory_order_seq_cst); 64 assert(f.test_and_set() == 0); 65 } 66 } 67
