libstdc++-v3/testsuite/23_containers/map/pthread6.cc

// 2002-01-23  Loren J. Rittle <rittle@labs.mot.com> <ljrittle@acm.org>
// Adpated from libstdc++/5444 submitted by markus.breuer@materna.de
//
// Copyright (C) 2002-2021 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/>.

// { dg-do run }
// { dg-options "-pthread"  }
// { dg-require-effective-target pthread }

#include <string>
#include <map>
#include <vector>
#include <pthread.h>

const int max_thread_count = 8;
const int loops = 100000;

const char* my_default = "Hallo Welt!";

const std::size_t upper_limit = 2500;
const std::size_t lower_limit = 1000;

typedef char charT;

typedef std::string String;

typedef String MyType;

void*
thread_main (void*)
{
  typedef std::map<unsigned int,MyType> Map;
  typedef Map::value_type Value_Pair;
  Map myMap;

  for (int loop = 0; loop < loops; loop++)
    {
      String& str = myMap[loop];
      str.append (my_default);
      myMap.insert (Value_Pair (loop, str));
      
      if (myMap.size () > upper_limit)
	{
	  while (myMap.size () > lower_limit)
	    {
	      Map::iterator it = myMap.begin ();
	      myMap.erase (it);
	    }
	}
    }

  return 0;
}

int
main (void)
{
  pthread_t tid[max_thread_count];

#if defined(__sun) && defined(__svr4__) && _XOPEN_VERSION >= 500
  pthread_setconcurrency (max_thread_count);
#endif

  for (int i = 0; i < max_thread_count; i++)
    pthread_create (&tid[i], 0, thread_main, 0);

  for (int i = 0; i < max_thread_count; i++)
    pthread_join (tid[i], 0);

  return 0;
}