libcxx/test/std/thread/futures/futures.unique_future/wait_for.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
  11
  12 // ALLOW_RETRIES: 3
  13
  14 // <future>
  15
  16 // class future<R>
  17
  18 // template <class Rep, class Period>
  19 //   future_status
  20 //   wait_for(const chrono::duration<Rep, Period>& rel_time) const;
  21
  22 #include <cassert>
  23 #include <chrono>
  24 #include <future>
  25
  26 #include "make_test_thread.h"
  27 #include "test_macros.h"
  28
  29 typedef std::chrono::milliseconds ms;
  30
  31 static const ms sleepTime(500);
  32 static const ms waitTime(5000);
  33
  34 void func1(std::promise<int> p)
  35 {
  36   std::this_thread::sleep_for(sleepTime);
  37   p.set_value(3);
  38 }
  39
  40 int j = 0;
  41
  42 void func3(std::promise<int&> p)
  43 {
  44   std::this_thread::sleep_for(sleepTime);
  45   j = 5;
  46   p.set_value(j);
  47 }
  48
  49 void func5(std::promise<void> p)
  50 {
  51   std::this_thread::sleep_for(sleepTime);
  52   p.set_value();
  53 }
  54
  55 template <typename T, typename F>
  56 void test(F func, bool waitFirst) {
  57   typedef std::chrono::high_resolution_clock Clock;
  58   std::promise<T> p;
  59   std::future<T> f = p.get_future();
  60   Clock::time_point t1, t0 = Clock::now();
  61   support::make_test_thread(func, std::move(p)).detach();
  62   assert(f.valid());
  63   assert(f.wait_for(ms(1)) == std::future_status::timeout);
  64   assert(f.valid());
  65   if (waitFirst) {
  66     f.wait();
  67     assert(f.valid());
  68     t1 = Clock::now();
  69     assert(f.wait_for(ms(waitTime)) == std::future_status::ready);
  70     assert(f.valid());
  71   } else {
  72     assert(f.wait_for(ms(waitTime)) == std::future_status::ready);
  73     assert(f.valid());
  74     t1 = Clock::now();
  75     f.wait();
  76     assert(f.valid());
  77   }
  78   assert(t1 - t0 >= sleepTime);
  79 }
  80
  81 int main(int, char**)
  82 {
  83   test<int>(func1, true);
  84   test<int&>(func3, true);
  85   test<void>(func5, true);
  86   test<int>(func1, false);
  87   test<int&>(func3, false);
  88   test<void>(func5, false);
  89   return 0;
  90 }