libstdc++-v3/testsuite/30_threads/packaged_task/members/at_thread_exit.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) 2014-2024 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 <testsuite_hooks.h>
  26
  27 bool executed = false;
  28
  29 int execute(int i) { executed = true; return i + 1; }
  30
  31 std::future<int> f1;
  32
  33 bool ready(std::future<int>& f)
  34 {
  35   return f.wait_for(std::chrono::milliseconds(1)) == std::future_status::ready;
  36 }
  37
  38 void test01()
  39 {
  40   std::packaged_task<int(int)> p1(execute);
  41   f1 = p1.get_future();
  42
  43   p1.make_ready_at_thread_exit(1);
  44
  45   VERIFY( executed );
  46   VERIFY( p1.valid() );
  47   VERIFY( !ready(f1) );
  48 }
  49
  50 int main()
  51 {
  52   std::thread t{test01};
  53   t.join();
  54   VERIFY( ready(f1) );
  55   VERIFY( f1.get() == 2 );
  56 }