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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_weak_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_weak_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 <cmpxchg_loop.h>
  31
  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()
  69 {
  70     TestEachAtomicType<TestFn>()();
  71 }