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   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 38
  12
  13 // <atomic>
  14
  15 // template <class T>
  16 //     bool
  17 //     atomic_compare_exchange_strong_explicit(volatile atomic<T>* obj, T* expc,
  18 //                                           T desr,
  19 //                                           memory_order s, memory_order f);
  20 //
  21 // template <class T>
  22 //     bool
  23 //     atomic_compare_exchange_strong_explicit(atomic<T>* obj, T* expc, T desr,
  24 //                                           memory_order s, memory_order f);
  25
  26 #include <atomic>
  27 #include <type_traits>
  28 #include <cassert>
  29
  30 #include "atomic_helpers.h"
  31
  32 template <class T>
  33 struct TestFn {
  34   void operator()() const {
  35     {
  36         typedef std::atomic<T> A;
  37         A a;
  38         T t(T(1));
  39         std::atomic_init(&a, t);
  40         assert(std::atomic_compare_exchange_strong_explicit(&a, &t, T(2),
  41                std::memory_order_seq_cst, std::memory_order_seq_cst) == true);
  42         assert(a == T(2));
  43         assert(t == T(1));
  44         assert(std::atomic_compare_exchange_strong_explicit(&a, &t, T(3),
  45                std::memory_order_seq_cst, std::memory_order_seq_cst) == false);
  46         assert(a == T(2));
  47         assert(t == T(2));
  48     }
  49     {
  50         typedef std::atomic<T> A;
  51         volatile A a;
  52         T t(T(1));
  53         std::atomic_init(&a, t);
  54         assert(std::atomic_compare_exchange_strong_explicit(&a, &t, T(2),
  55                std::memory_order_seq_cst, std::memory_order_seq_cst) == true);
  56         assert(a == T(2));
  57         assert(t == T(1));
  58         assert(std::atomic_compare_exchange_strong_explicit(&a, &t, T(3),
  59                std::memory_order_seq_cst, std::memory_order_seq_cst) == false);
  60         assert(a == T(2));
  61         assert(t == T(2));
  62     }
  63   }
  64 };
  65
  66 int main()
  67 {
  68     TestEachAtomicType<TestFn>()();
  69 }