libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_time_point.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 // class shared_timed_mutex;
  15
  16 // template <class Clock, class Duration>
  17 //   shared_lock(mutex_type& m, const chrono::time_point<Clock, Duration>& abs_time);
  18
  19 #include <thread>
  20
  21 #include <atomic>
  22 #include <chrono>
  23 #include <cassert>
  24 #include <cstdlib>
  25 #include <shared_mutex>
  26 #include <vector>
  27
  28 #include "make_test_thread.h"
  29 #include "test_macros.h"
  30
  31 std::shared_timed_mutex m;
  32
  33 typedef std::chrono::steady_clock Clock;
  34 typedef Clock::time_point time_point;
  35 typedef Clock::duration duration;
  36 typedef std::chrono::milliseconds ms;
  37 typedef std::chrono::nanoseconds ns;
  38
  39 ms LongTime = ms(5000);
  40 ms ShortTime = ms(50);
  41
  42 static constexpr unsigned Threads = 5;
  43
  44 std::atomic<unsigned> CountDown(Threads);
  45
  46 void f1()
  47 {
  48   --CountDown;
  49   time_point t0 = Clock::now();
  50   std::shared_lock<std::shared_timed_mutex> lk(m, t0 + LongTime);
  51   time_point t1 = Clock::now();
  52   assert(lk.owns_lock() == true);
  53   assert(t1 - t0 <= LongTime);
  54 }
  55
  56 void f2()
  57 {
  58   time_point t0 = Clock::now();
  59   std::shared_lock<std::shared_timed_mutex> lk(m, t0 + ShortTime);
  60   time_point t1 = Clock::now();
  61   assert(lk.owns_lock() == false);
  62   assert(t1 - t0 >= ShortTime);
  63 }
  64
  65 int main(int, char**)
  66 {
  67   {
  68     m.lock();
  69     std::vector<std::thread> v;
  70     for (unsigned i = 0; i < Threads; ++i)
  71       v.push_back(support::make_test_thread(f1));
  72     while (CountDown > 0)
  73       std::this_thread::yield();
  74     std::this_thread::sleep_for(ShortTime);
  75     m.unlock();
  76     for (auto& t : v)
  77       t.join();
  78   }
  79   {
  80     m.lock();
  81     std::vector<std::thread> v;
  82     for (unsigned i = 0; i < Threads; ++i)
  83       v.push_back(support::make_test_thread(f2));
  84     for (auto& t : v)
  85       t.join();
  86     m.unlock();
  87   }
  88
  89   return 0;
  90 }