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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_weak_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_weak_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 <cmpxchg_loop.h>
  30
  31 #include "test_macros.h"
  32 #include "atomic_helpers.h"
  33
  34 template <class T>
  35 struct TestFn {
  36   void operator()() const {
  37     {
  38         typedef std::atomic<T> A;
  39         A a;
  40         T t(T(1));
  41         std::atomic_init(&a, t);
  42         assert(c_cmpxchg_weak_loop(&a, &t, T(2),
  43                std::memory_order_seq_cst, std::memory_order_seq_cst) == true);
  44         assert(a == T(2));
  45         assert(t == T(1));
  46         assert(std::atomic_compare_exchange_weak_explicit(&a, &t, T(3),
  47                std::memory_order_seq_cst, std::memory_order_seq_cst) == false);
  48         assert(a == T(2));
  49         assert(t == T(2));
  50     }
  51     {
  52         typedef std::atomic<T> A;
  53         volatile A a;
  54         T t(T(1));
  55         std::atomic_init(&a, t);
  56         assert(c_cmpxchg_weak_loop(&a, &t, T(2),
  57                std::memory_order_seq_cst, std::memory_order_seq_cst) == true);
  58         assert(a == T(2));
  59         assert(t == T(1));
  60         assert(std::atomic_compare_exchange_weak_explicit(&a, &t, T(3),
  61                std::memory_order_seq_cst, std::memory_order_seq_cst) == false);
  62         assert(a == T(2));
  63         assert(t == T(2));
  64     }
  65   }
  66 };
  67
  68 int main(int, char**)
  69 {
  70     TestEachAtomicType<TestFn>()();
  71
  72   return 0;
  73 }