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-cstdint "" }
   6 // { dg-require-gthreads "" }
   7
   8 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
   9 //
  10 // This file is part of the GNU ISO C++ Library.  This library is free
  11 // software; you can redistribute it and/or modify it under the
  12 // terms of the GNU General Public License as published by the
  13 // Free Software Foundation; either version 3, or (at your option)
  14 // any later version.
  15
  16 // This library is distributed in the hope that it will be useful,
  17 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 // GNU General Public License for more details.
  20
  21 // You should have received a copy of the GNU General Public License along
  22 // with this library; see the file COPYING3.  If not see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 #include <future>
  26 #include <testsuite_hooks.h>
  27
  28
  29 // Test promise::set_value() for deadlock by checking if the state is ready
  30 // during construction and destruction of the associated state.
  31
  32 struct tester
  33 {
  34   tester(int);
  35   tester(const tester&);
  36   tester() = delete;
  37   tester& operator=(const tester&);
  38 };
  39
  40 std::promise<tester> pglobal;
  41 std::future<tester> fglobal = pglobal.get_future();
  42
  43 auto delay = std::chrono::milliseconds(1);
  44
  45 tester::tester(int)
  46 {
  47   VERIFY (fglobal.wait_for(delay) == std::future_status::timeout);
  48 }
  49
  50 tester::tester(const tester&)
  51 {
  52   // if this copy happens while a mutex is locked next line could deadlock:
  53   VERIFY (fglobal.wait_for(delay) == std::future_status::timeout);
  54 }
  55
  56 tester& tester::operator=(const tester&)
  57 {
  58   // if this copy happens while a mutex is locked next line could deadlock:
  59   VERIFY (fglobal.wait_for(delay) == std::future_status::timeout);
  60   return *this;
  61 }
  62
  63 void test01()
  64 {
  65   pglobal.set_value( tester(1) );
  66
  67   VERIFY (fglobal.wait_for(delay) == std::future_status::ready);
  68 }
  69
  70 int main()
  71 {
  72   test01();
  73   return 0;
  74 }