libstdc++-v3/testsuite/30_threads/promise/members/at_thread_exit.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) 2014-2020 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 int copies;
  29 int copies_cmp;
  30
  31 struct Obj
  32 {
  33   Obj() = default;
  34   Obj(const Obj&) { ++copies; }
  35 };
  36
  37 std::future<Obj> f1;
  38
  39 bool ready(std::future<Obj>& f)
  40 {
  41   return f.wait_for(std::chrono::milliseconds(1)) == std::future_status::ready;
  42 }
  43
  44 void test01()
  45 {
  46   std::promise<Obj> p1;
  47   f1 = p1.get_future();
  48
  49   p1.set_value_at_thread_exit( {} );
  50
  51   copies_cmp = copies;
  52
  53   VERIFY( !ready(f1) );
  54 }
  55
  56 int main()
  57 {
  58   std::thread t{test01};
  59   t.join();
  60   VERIFY( ready(f1) );
  61   VERIFY( copies == copies_cmp );
  62 }