libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock_until.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 // template <class Clock, class Duration>
  17 //   bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
  18
  19 #include <cassert>
  20 #include <chrono>
  21 #include <mutex>
  22 #include <shared_mutex>
  23 #include <system_error>
  24
  25 #include "test_macros.h"
  26
  27 bool try_lock_until_called = false;
  28
  29 struct mutex
  30 {
  31     template <class Clock, class Duration>
  32         bool try_lock_shared_until(const std::chrono::time_point<Clock, Duration>& abs_time)
  33     {
  34         typedef std::chrono::milliseconds ms;
  35         assert(Clock::now() - abs_time < ms(5));
  36         try_lock_until_called = !try_lock_until_called;
  37         return try_lock_until_called;
  38     }
  39     void unlock_shared() {}
  40 };
  41
  42 mutex m;
  43
  44 int main(int, char**)
  45 {
  46     typedef std::chrono::steady_clock Clock;
  47     std::shared_lock<mutex> lk(m, std::defer_lock);
  48     assert(lk.try_lock_until(Clock::now()) == true);
  49     assert(try_lock_until_called == true);
  50     assert(lk.owns_lock() == true);
  51 #ifndef TEST_HAS_NO_EXCEPTIONS
  52     try
  53     {
  54         TEST_IGNORE_NODISCARD lk.try_lock_until(Clock::now());
  55         assert(false);
  56     }
  57     catch (std::system_error& e)
  58     {
  59         assert(e.code().value() == EDEADLK);
  60     }
  61 #endif
  62     lk.unlock();
  63     assert(lk.try_lock_until(Clock::now()) == false);
  64     assert(try_lock_until_called == false);
  65     assert(lk.owns_lock() == false);
  66     lk.release();
  67 #ifndef TEST_HAS_NO_EXCEPTIONS
  68     try
  69     {
  70         TEST_IGNORE_NODISCARD lk.try_lock_until(Clock::now());
  71         assert(false);
  72     }
  73     catch (std::system_error& e)
  74     {
  75         assert(e.code().value() == EPERM);
  76     }
  77 #endif
  78
  79   return 0;
  80 }