libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.obs/mutex.pass.cpp

   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: no-threads
  10
  11 // <mutex>
  12
  13 // template <class Mutex> class unique_lock;
  14
  15 // mutex_type *mutex() const;
  16
  17 #include <mutex>
  18 #include <cassert>
  19
  20 #include "test_macros.h"
  21
  22 std::mutex m;
  23
  24 int main(int, char**)
  25 {
  26     std::unique_lock<std::mutex> lk0;
  27     assert(lk0.mutex() == nullptr);
  28     std::unique_lock<std::mutex> lk1(m);
  29     assert(lk1.mutex() == &m);
  30     lk1.unlock();
  31     assert(lk1.mutex() == &m);
  32
  33   return 0;
  34 }