libstdc++-v3/testsuite/30_threads/promise/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) 2014-2022 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 int copies;
  28 int copies_cmp;
  29
  30 struct Obj
  31 {
  32   Obj() = default;
  33   Obj(const Obj&) { ++copies; }
  34 };
  35
  36 std::future<Obj> f1;
  37
  38 bool ready(std::future<Obj>& f)
  39 {
  40   return f.wait_for(std::chrono::milliseconds(1)) == std::future_status::ready;
  41 }
  42
  43 void test01()
  44 {
  45   std::promise<Obj> p1;
  46   f1 = p1.get_future();
  47
  48   p1.set_value_at_thread_exit( {} );
  49
  50   copies_cmp = copies;
  51
  52   VERIFY( !ready(f1) );
  53 }
  54
  55 int main()
  56 {
  57   std::thread t{test01};
  58   t.join();
  59   VERIFY( ready(f1) );
  60   VERIFY( copies == copies_cmp );
  61 }