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 // This test uses new symbols that were not defined in the libc++ shipped on
11 // darwin11 and darwin12:
12 // XFAIL: with_system_lib=x86_64-apple-darwin11
13 // XFAIL: with_system_lib=x86_64-apple-darwin12
14
15 // <memory>
16
17 // shared_ptr
18
19 // template <class T>
20 // bool
21 // atomic_compare_exchange_weak_explicit(shared_ptr<T>* p, shared_ptr<T>* v,
22 // shared_ptr<T> w, memory_order success,
23 // memory_order failure);
24
25 #include <memory>
26 #include <cassert>
27
main()28 int main()
29 {
30 #if __has_feature(cxx_atomic)
31 {
32 std::shared_ptr<int> p(new int(4));
33 std::shared_ptr<int> v(new int(3));
34 std::shared_ptr<int> w(new int(2));
35 bool b = std::atomic_compare_exchange_weak_explicit(&p, &v, w,
36 std::memory_order_seq_cst,
37 std::memory_order_seq_cst);
38 assert(b == false);
39 assert(*p == 4);
40 assert(*v == 4);
41 assert(*w == 2);
42 }
43 {
44 std::shared_ptr<int> p(new int(4));
45 std::shared_ptr<int> v = p;
46 std::shared_ptr<int> w(new int(2));
47 bool b = std::atomic_compare_exchange_weak_explicit(&p, &v, w,
48 std::memory_order_seq_cst,
49 std::memory_order_seq_cst);
50 assert(b == true);
51 assert(*p == 2);
52 assert(*v == 4);
53 assert(*w == 2);
54 }
55 #endif
56 }
57