libstdc++-v3/testsuite/30_threads/call_once/call_once1.cc

   1 // { dg-do run { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-gnu* *-*-solaris* *-*-cygwin *-*-darwin* powerpc-ibm-aix* } }
   2 // { dg-options " -std=gnu++0x -pthread" { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-gnu* powerpc-ibm-aix* } }
   3 // { dg-options " -std=gnu++0x -pthreads" { target *-*-solaris* } }
   4 // { dg-options " -std=gnu++0x " { target *-*-cygwin *-*-darwin* } }
   5 // { dg-require-cstdint "" }
   6 // { dg-require-gthreads "" }
   7
   8 // Copyright (C) 2008-2013 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
  26 #include <mutex>
  27 #include <system_error>
  28 #include <testsuite_hooks.h>
  29
  30 std::once_flag value_flag;
  31 int value = 1;
  32
  33 void add_to_value(int i)
  34 {
  35   value += i;
  36 }
  37
  38 int main()
  39 {
  40   bool test __attribute__((unused)) = true;
  41
  42   try
  43     {
  44       std::call_once(value_flag, add_to_value, 2);
  45       std::call_once(value_flag, add_to_value, 2);
  46     }
  47   catch (const std::system_error& e)
  48     {
  49       VERIFY( false );
  50     }
  51   catch (...)
  52     {
  53       VERIFY( false );
  54     }
  55
  56   VERIFY( value == 3 );
  57
  58   return 0;
  59 }