boost_1_45_0/libs/interprocess/example/doc_named_mutex.cpp

//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2006-2009. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/interprocess for documentation.
//
//////////////////////////////////////////////////////////////////////////////
#include <boost/interprocess/detail/config_begin.hpp>
//[doc_named_mutex
#include <boost/interprocess/sync/scoped_lock.hpp>
#include <boost/interprocess/sync/named_mutex.hpp>
#include <fstream>
#include <iostream>
#include <cstdio>

//<-
#include "../test/get_process_id_name.hpp"
//->

int main ()
{
   using namespace boost::interprocess;
   try{
      struct file_remove
      {
      //<-
      #if 1
         file_remove() { std::remove(test::get_process_id_name()); }
         ~file_remove(){ std::remove(test::get_process_id_name()); }
      #else
      //->
         file_remove() { std::remove("file_name"); }
         ~file_remove(){ std::remove("file_name"); }
      //<-
      #endif
      //->
      } file_remover;
      struct mutex_remove
      {
      //<-
      #if 1
         mutex_remove() { named_mutex::remove(test::get_process_id_name()); }
         ~mutex_remove(){ named_mutex::remove(test::get_process_id_name()); }
      #else
      //->
         mutex_remove() { named_mutex::remove("fstream_named_mutex"); }
         ~mutex_remove(){ named_mutex::remove("fstream_named_mutex"); }
      //<-
      #endif
      //->
      } remover;

      //Open or create the named mutex
   //<-
   #if 1
      named_mutex mutex(open_or_create, test::get_process_id_name());
   #else
   //->
      named_mutex mutex(open_or_create, "fstream_named_mutex");
   //<-
   #endif
   //->

      //<-
      #if 1
      std::ofstream file(test::get_process_id_name());
      #else
      //->
      std::ofstream file("file_name");
      //<-
      #endif
      //->

      for(int i = 0; i < 10; ++i){
         
         //Do some operations...

         //Write to file atomically
         scoped_lock<named_mutex> lock(mutex);
         file << "Process name, ";
         file << "This is iteration #" << i;
         file << std::endl;
      }
   }
   catch(interprocess_exception &ex){
      std::cout << ex.what() << std::endl;
      return 1;
   }
   return 0;
}
//]
#include <boost/interprocess/detail/config_end.hpp>