libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock.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 // UNSUPPORTED: availability-shared_mutex-missing
  13
  14 // ALLOW_RETRIES: 3
  15
  16 // <shared_mutex>
  17
  18 // class shared_timed_mutex;
  19
  20 // void lock();
  21
  22 #include <atomic>
  23 #include <cassert>
  24 #include <chrono>
  25 #include <cstdlib>
  26 #include <shared_mutex>
  27 #include <thread>
  28
  29 #include "make_test_thread.h"
  30 #include "test_macros.h"
  31
  32 std::shared_timed_mutex m;
  33
  34 typedef std::chrono::system_clock Clock;
  35 typedef Clock::time_point time_point;
  36 typedef Clock::duration duration;
  37 typedef std::chrono::milliseconds ms;
  38 typedef std::chrono::nanoseconds ns;
  39
  40 std::atomic<bool> ready(false);
  41 time_point start;
  42
  43 ms WaitTime = ms(250);
  44
  45 void f()
  46 {
  47   ready.store(true);
  48   m.lock();
  49   time_point t0 = start;
  50   time_point t1 = Clock::now();
  51   m.unlock();
  52   assert(t0.time_since_epoch() > ms(0));
  53   assert(t1 - t0 >= WaitTime);
  54 }
  55
  56 int main(int, char**)
  57 {
  58   m.lock();
  59   std::thread t = support::make_test_thread(f);
  60   while (!ready)
  61     std::this_thread::yield();
  62   start = Clock::now();
  63   std::this_thread::sleep_for(WaitTime);
  64   m.unlock();
  65   t.join();
  66
  67   return 0;
  68 }