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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 
     12 // <atomic>
     13 
     14 // struct atomic_flag
     15 
     16 // bool test_and_set(memory_order = memory_order_seq_cst);
     17 // bool test_and_set(memory_order = memory_order_seq_cst) volatile;
     18 
     19 #include <atomic>
     20 #include <cassert>
     21 
     22 int main()
     23 {
     24     {
     25         std::atomic_flag f;
     26         f.clear();
     27         assert(f.test_and_set() == 0);
     28         assert(f.test_and_set() == 1);
     29     }
     30     {
     31         std::atomic_flag f;
     32         f.clear();
     33         assert(f.test_and_set(std::memory_order_relaxed) == 0);
     34         assert(f.test_and_set(std::memory_order_relaxed) == 1);
     35     }
     36     {
     37         std::atomic_flag f;
     38         f.clear();
     39         assert(f.test_and_set(std::memory_order_consume) == 0);
     40         assert(f.test_and_set(std::memory_order_consume) == 1);
     41     }
     42     {
     43         std::atomic_flag f;
     44         f.clear();
     45         assert(f.test_and_set(std::memory_order_acquire) == 0);
     46         assert(f.test_and_set(std::memory_order_acquire) == 1);
     47     }
     48     {
     49         std::atomic_flag f;
     50         f.clear();
     51         assert(f.test_and_set(std::memory_order_release) == 0);
     52         assert(f.test_and_set(std::memory_order_release) == 1);
     53     }
     54     {
     55         std::atomic_flag f;
     56         f.clear();
     57         assert(f.test_and_set(std::memory_order_acq_rel) == 0);
     58         assert(f.test_and_set(std::memory_order_acq_rel) == 1);
     59     }
     60     {
     61         std::atomic_flag f;
     62         f.clear();
     63         assert(f.test_and_set(std::memory_order_seq_cst) == 0);
     64         assert(f.test_and_set(std::memory_order_seq_cst) == 1);
     65     }
     66     {
     67         volatile std::atomic_flag f;
     68         f.clear();
     69         assert(f.test_and_set() == 0);
     70         assert(f.test_and_set() == 1);
     71     }
     72     {
     73         volatile std::atomic_flag f;
     74         f.clear();
     75         assert(f.test_and_set(std::memory_order_relaxed) == 0);
     76         assert(f.test_and_set(std::memory_order_relaxed) == 1);
     77     }
     78     {
     79         volatile std::atomic_flag f;
     80         f.clear();
     81         assert(f.test_and_set(std::memory_order_consume) == 0);
     82         assert(f.test_and_set(std::memory_order_consume) == 1);
     83     }
     84     {
     85         volatile std::atomic_flag f;
     86         f.clear();
     87         assert(f.test_and_set(std::memory_order_acquire) == 0);
     88         assert(f.test_and_set(std::memory_order_acquire) == 1);
     89     }
     90     {
     91         volatile std::atomic_flag f;
     92         f.clear();
     93         assert(f.test_and_set(std::memory_order_release) == 0);
     94         assert(f.test_and_set(std::memory_order_release) == 1);
     95     }
     96     {
     97         volatile std::atomic_flag f;
     98         f.clear();
     99         assert(f.test_and_set(std::memory_order_acq_rel) == 0);
    100         assert(f.test_and_set(std::memory_order_acq_rel) == 1);
    101     }
    102     {
    103         volatile std::atomic_flag f;
    104         f.clear();
    105         assert(f.test_and_set(std::memory_order_seq_cst) == 0);
    106         assert(f.test_and_set(std::memory_order_seq_cst) == 1);
    107     }
    108 }
    109