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// { dg-do run { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-solaris* *-*-cygwin *-*-darwin* alpha*-*-osf* mips-sgi-irix6* powerpc-ibm-aix* } }

// { dg-options " -std=gnu++0x -pthread" { target *-*-freebsd* *-*-netbsd* *-*-linux* alpha*-*-osf* mips-sgi-irix6* powerpc-ibm-aix* } }

// { dg-options " -std=gnu++0x -pthreads" { target *-*-solaris* } }

// { dg-options " -std=gnu++0x " { target *-*-cygwin *-*-darwin* } }

// { dg-require-cstdint "" }

// { dg-require-gthreads "" }

// Copyright (C) 2009, 2010, 2011, 2012 Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library is free

// software; you can redistribute it and/or modify it under the

// terms of the GNU General Public License as published by the

// Free Software Foundation; either version 3, or (at your option)

// any later version.

// This library is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along

// with this library; see the file COPYING3.  If not see

// <http://www.gnu.org/licenses/>.

#include <mutex>

#include <thread>

#include <testsuite_hooks.h>

std::once_flag flag;

int value = 0;

struct Inc { void operator()() const { ++value; } };

struct Func

{

   void operator()() const

   {

       Inc inc;

       for (int i = 0; i < 10000;  ++i)

           std::call_once(flag, inc);

   }

};

int main()

{

   Func f;

   std::thread t1(f);

   std::thread t2(f);

   std::thread t3(f);

   t1.join();

   t2.join();

   t3.join();

   VERIFY( value == 1 );

   return 0;

}