libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.mod/release.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* release() noexcept;
  16
  17 #include <mutex>
  18 #include <cassert>
  19
  20 #include "test_macros.h"
  21
  22 struct mutex
  23 {
  24     static int lock_count;
  25     static int unlock_count;
  26     void lock() {++lock_count;}
  27     void unlock() {++unlock_count;}
  28 };
  29
  30 int mutex::lock_count = 0;
  31 int mutex::unlock_count = 0;
  32
  33 mutex m;
  34
  35 int main(int, char**)
  36 {
  37     std::unique_lock<mutex> lk(m);
  38     assert(lk.mutex() == &m);
  39     assert(lk.owns_lock() == true);
  40     assert(mutex::lock_count == 1);
  41     assert(mutex::unlock_count == 0);
  42     assert(lk.release() == &m);
  43     assert(lk.mutex() == nullptr);
  44     assert(lk.owns_lock() == false);
  45     assert(mutex::lock_count == 1);
  46     assert(mutex::unlock_count == 0);
  47
  48   return 0;
  49 }