libstdc++-v3/testsuite/30_threads/async/async.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-cstdint "" }
   6 // { dg-require-gthreads "" }
   7
   8 // Copyright (C) 2010-2018 Free Software Foundation, Inc.
   9 //
  10 // This file is part of the GNU ISO C++ Library.  This library is free
  11 // software; you can redistribute it and/or modify it under the
  12 // terms of the GNU General Public License as published by the
  13 // Free Software Foundation; either version 3, or (at your option)
  14 // any later version.
  15
  16 // This library is distributed in the hope that it will be useful,
  17 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 // GNU General Public License for more details.
  20
  21 // You should have received a copy of the GNU General Public License along
  22 // with this library; see the file COPYING3.  If not see
  23 // <http://www.gnu.org/licenses/>.
  24
  25
  26 #include <future>
  27 #include <testsuite_hooks.h>
  28
  29 using namespace std;
  30
  31 void work(mutex& m)
  32 {
  33   unique_lock<mutex> l(m);
  34 }
  35
  36 void test01()
  37 {
  38   mutex m;
  39   unique_lock<mutex> l(m);
  40   future<void> f1 = async(launch::async, &work, ref(m));
  41   l.unlock();  // allow async thread to proceed
  42   f1.get();    // wait for it to finish
  43 }
  44
  45 void test02()
  46 {
  47   mutex m;
  48   unique_lock<mutex> l(m);
  49   future<void> f1 = async(launch::async, &work, ref(m));
  50   std::future_status status;
  51   status = f1.wait_for(std::chrono::milliseconds(1));
  52   VERIFY( status == std::future_status::timeout );
  53   status = f1.wait_until(std::chrono::system_clock::now());
  54   VERIFY( status == std::future_status::timeout );
  55   l.unlock();  // allow async thread to proceed
  56   f1.wait();   // wait for it to finish
  57   status = f1.wait_for(std::chrono::milliseconds(0));
  58   VERIFY( status == std::future_status::ready );
  59   status = f1.wait_until(std::chrono::system_clock::now());
  60   VERIFY( status == std::future_status::ready );
  61 }
  62
  63 int main()
  64 {
  65   test01();
  66   test02();
  67   return 0;
  68 }