libstdc++-v3/testsuite/30_threads/shared_future/members/wait_for.cc

   1 // { dg-do run }
   2 // { dg-additional-options "-pthread" { target pthread } }
   3 // { dg-require-effective-target c++11 }
   4 // { dg-require-gthreads "" }
   5
   6 // Copyright (C) 2009-2024 Free Software Foundation, Inc.
   7 //
   8 // This file is part of the GNU ISO C++ Library.  This library is free
   9 // software; you can redistribute it and/or modify it under the
  10 // terms of the GNU General Public License as published by the
  11 // Free Software Foundation; either version 3, or (at your option)
  12 // any later version.
  13
  14 // This library is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 // GNU General Public License for more details.
  18
  19 // You should have received a copy of the GNU General Public License along
  20 // with this library; see the file COPYING3.  If not see
  21 // <http://www.gnu.org/licenses/>.
  22
  23
  24 #include <future>
  25 #include <chrono>
  26 #include <testsuite_hooks.h>
  27
  28 void test01()
  29 {
  30   std::promise<int> p1;
  31   std::shared_future<int> f1(p1.get_future());
  32   std::shared_future<int> f2(f1);
  33
  34   std::chrono::milliseconds delay(100);
  35
  36   VERIFY( f1.wait_for(delay) == std::future_status::timeout );
  37   VERIFY( f2.wait_for(delay) == std::future_status::timeout );
  38
  39   p1.set_value(1);
  40
  41   auto before = std::chrono::system_clock::now();
  42   VERIFY( f1.wait_for(delay) == std::future_status::ready );
  43   VERIFY( f2.wait_for(delay) == std::future_status::ready );
  44   VERIFY( std::chrono::system_clock::now() < (before + 2*delay) );
  45 }
  46
  47 int main()
  48 {
  49   test01();
  50   return 0;
  51 }