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 // <mutex>
  10
  11 // template <class Mutex> class unique_lock;
  12
  13 // mutex_type *mutex() const;
  14
  15 #include <cassert>
  16 #include <memory>
  17 #include <mutex>
  18
  19 #include "checking_mutex.h"
  20 #include "test_macros.h"
  21
  22 #if TEST_STD_VER >= 11
  23 static_assert(noexcept(std::declval<std::unique_lock<checking_mutex>&>().mutex()), "");
  24 #endif
  25
  26 int main(int, char**) {
  27   checking_mutex mux;
  28   const std::unique_lock<checking_mutex> lock0; // Make sure `mutex()` is `const`
  29   static_assert(std::is_same<decltype(lock0.mutex()), checking_mutex*>::value, "");
  30   assert(lock0.mutex() == nullptr);
  31   std::unique_lock<checking_mutex> lock1(mux);
  32   assert(lock1.mutex() == std::addressof(mux));
  33   lock1.unlock();
  34   assert(lock1.mutex() == std::addressof(mux));
  35
  36   return 0;
  37 }