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 // ... assertion fails line 34 12 13 // <atomic> 14 15 // template <class T> 16 // bool 17 // atomic_compare_exchange_strong(volatile atomic<T>* obj, T* expc, T desr); 18 // 19 // template <class T> 20 // bool 21 // atomic_compare_exchange_strong(atomic<T>* obj, T* expc, T desr); 22 23 #include <atomic> 24 #include <type_traits> 25 #include <cassert> 26 27 #include "atomic_helpers.h" 28 29 template <class T> 30 struct TestFn { 31 void operator()() const { 32 { 33 typedef std::atomic<T> A; 34 A a; 35 T t(T(1)); 36 std::atomic_init(&a, t); 37 assert(std::atomic_compare_exchange_strong(&a, &t, T(2)) == true); 38 assert(a == T(2)); 39 assert(t == T(1)); 40 assert(std::atomic_compare_exchange_strong(&a, &t, T(3)) == false); 41 assert(a == T(2)); 42 assert(t == T(2)); 43 } 44 { 45 typedef std::atomic<T> A; 46 volatile A a; 47 T t(T(1)); 48 std::atomic_init(&a, t); 49 assert(std::atomic_compare_exchange_strong(&a, &t, T(2)) == true); 50 assert(a == T(2)); 51 assert(t == T(1)); 52 assert(std::atomic_compare_exchange_strong(&a, &t, T(3)) == false); 53 assert(a == T(2)); 54 assert(t == T(2)); 55 } 56 } 57 }; 58 59 int main() 60 { 61 TestEachAtomicType<TestFn>()(); 62 } 63
