libstdc++-v3/testsuite/30_threads/promise/members/set_value3.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) 2009-2023 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 #include <future>
  24 #include <testsuite_hooks.h>
  25
  26
  27 // Test promise::set_value() for deadlock by checking if the state is ready
  28 // during construction and destruction of the associated state.
  29
  30 struct tester
  31 {
  32   tester(int);
  33   tester(const tester&);
  34   tester() = delete;
  35   tester& operator=(const tester&);
  36 };
  37
  38 std::promise<tester> pglobal;
  39 std::future<tester> fglobal = pglobal.get_future();
  40
  41 auto delay = std::chrono::milliseconds(1);
  42
  43 tester::tester(int)
  44 {
  45   VERIFY (fglobal.wait_for(delay) == std::future_status::timeout);
  46 }
  47
  48 tester::tester(const tester&)
  49 {
  50   // if this copy happens while a mutex is locked next line could deadlock:
  51   VERIFY (fglobal.wait_for(delay) == std::future_status::timeout);
  52 }
  53
  54 tester& tester::operator=(const tester&)
  55 {
  56   // if this copy happens while a mutex is locked next line could deadlock:
  57   VERIFY (fglobal.wait_for(delay) == std::future_status::timeout);
  58   return *this;
  59 }
  60
  61 void test01()
  62 {
  63   pglobal.set_value( tester(1) );
  64
  65   VERIFY (fglobal.wait_for(delay) == std::future_status::ready);
  66 }
  67
  68 int main()
  69 {
  70   test01();
  71   return 0;
  72 }