libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/unlock.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 // UNSUPPORTED: c++03, c++11
  11
  12 // <shared_mutex>
  13
  14 // template <class Mutex> class shared_lock;
  15
  16 // void unlock();
  17
  18 #include <cassert>
  19 #include <cerrno>
  20 #include <shared_mutex>
  21 #include <system_error>
  22
  23 #include "test_macros.h"
  24
  25 bool unlock_called = false;
  26
  27 struct mutex
  28 {
  29     void lock_shared() {}
  30     void unlock_shared() {unlock_called = true;}
  31 };
  32
  33 mutex m;
  34
  35 int main(int, char**)
  36 {
  37     std::shared_lock<mutex> lk(m);
  38     lk.unlock();
  39     assert(unlock_called == true);
  40     assert(lk.owns_lock() == false);
  41 #ifndef TEST_HAS_NO_EXCEPTIONS
  42     try
  43     {
  44         lk.unlock();
  45         assert(false);
  46     }
  47     catch (std::system_error& e)
  48     {
  49         assert(e.code().value() == EPERM);
  50     }
  51 #endif
  52     lk.release();
  53 #ifndef TEST_HAS_NO_EXCEPTIONS
  54     try
  55     {
  56         lk.unlock();
  57         assert(false);
  58     }
  59     catch (std::system_error& e)
  60     {
  61         assert(e.code().value() == EPERM);
  62     }
  63 #endif
  64
  65   return 0;
  66 }