libstdc++-v3/testsuite/30_threads/promise/members/set_value3.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) 2009-2020 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 #include <future>
  25 #include <testsuite_hooks.h>
  26
  27
  28 // Test promise::set_value() for deadlock by checking if the state is ready
  29 // during construction and destruction of the associated state.
  30
  31 struct tester
  32 {
  33   tester(int);
  34   tester(const tester&);
  35   tester() = delete;
  36   tester& operator=(const tester&);
  37 };
  38
  39 std::promise<tester> pglobal;
  40 std::future<tester> fglobal = pglobal.get_future();
  41
  42 auto delay = std::chrono::milliseconds(1);
  43
  44 tester::tester(int)
  45 {
  46   VERIFY (fglobal.wait_for(delay) == std::future_status::timeout);
  47 }
  48
  49 tester::tester(const tester&)
  50 {
  51   // if this copy happens while a mutex is locked next line could deadlock:
  52   VERIFY (fglobal.wait_for(delay) == std::future_status::timeout);
  53 }
  54
  55 tester& tester::operator=(const tester&)
  56 {
  57   // if this copy happens while a mutex is locked next line could deadlock:
  58   VERIFY (fglobal.wait_for(delay) == std::future_status::timeout);
  59   return *this;
  60 }
  61
  62 void test01()
  63 {
  64   pglobal.set_value( tester(1) );
  65
  66   VERIFY (fglobal.wait_for(delay) == std::future_status::ready);
  67 }
  68
  69 int main()
  70 {
  71   test01();
  72   return 0;
  73 }