libstdc++-v3/testsuite/30_threads/async/sync.cc

   1 // { dg-do run }
   2 // { dg-options "-pthread"  }
   3 // { dg-require-effective-target c++11 }
   4 // { dg-require-effective-target pthread }
   5 // { dg-require-gthreads "" }
   6
   7 // Copyright (C) 2010-2020 Free Software Foundation, Inc.
   8 //
   9 // This file is part of the GNU ISO C++ Library.  This library is free
  10 // software; you can redistribute it and/or modify it under the
  11 // terms of the GNU General Public License as published by the
  12 // Free Software Foundation; either version 3, or (at your option)
  13 // any later version.
  14
  15 // This library is distributed in the hope that it will be useful,
  16 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 // GNU General Public License for more details.
  19
  20 // You should have received a copy of the GNU General Public License along
  21 // with this library; see the file COPYING3.  If not see
  22 // <http://www.gnu.org/licenses/>.
  23
  24
  25 #include <future>
  26 #include <testsuite_hooks.h>
  27
  28 struct sum {
  29   typedef int result_type;
  30   int operator()(int i, int& j, const int& k) { return i + j + k; }
  31 };
  32
  33 void test01()
  34 {
  35   using namespace std;
  36
  37   int a = 1;
  38   int b = 1;
  39   int c = 1;
  40   future<int> f1 = async(launch::deferred, sum(), a, ref(b), cref(c));
  41   a = 0;
  42   b = 10;
  43   c = 100;
  44
  45   const std::chrono::seconds delay(10);
  46   const auto then = std::chrono::system_clock::now() + delay;
  47
  48   VERIFY( f1.valid() );
  49   // timed waiting functions should return 'deferred' immediately
  50   VERIFY( f1.wait_until(then) == std::future_status::deferred );
  51   VERIFY( f1.wait_for(delay) == std::future_status::deferred );
  52   VERIFY( std::chrono::system_clock::now() < then );
  53
  54   f1.wait();
  55
  56   VERIFY( f1.valid() );
  57   // timed waiting functions should return 'ready' immediately
  58   VERIFY( f1.wait_until(then) == std::future_status::ready );
  59   VERIFY( f1.wait_for(delay) == std::future_status::ready );
  60   VERIFY( std::chrono::system_clock::now() < then );
  61
  62   VERIFY( f1.get() == 111 );
  63   VERIFY( !f1.valid() );
  64 }
  65
  66 int main()
  67 {
  68   test01();
  69   return 0;
  70 }