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   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // UNSUPPORTED: libcpp-has-no-threads
  10 //  ... assertion fails line 38
  11
  12 // <atomic>
  13
  14 // template <class T>
  15 //     bool
  16 //     atomic_compare_exchange_strong_explicit(volatile atomic<T>* obj, T* expc,
  17 //                                           T desr,
  18 //                                           memory_order s, memory_order f);
  19 //
  20 // template <class T>
  21 //     bool
  22 //     atomic_compare_exchange_strong_explicit(atomic<T>* obj, T* expc, T desr,
  23 //                                           memory_order s, memory_order f);
  24
  25 #include <atomic>
  26 #include <type_traits>
  27 #include <cassert>
  28
  29 #include "test_macros.h"
  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(int, char**)
  67 {
  68     TestEachAtomicType<TestFn>()();
  69
  70   return 0;
  71 }