Welcome to the Lounge

Int32 StationHashStorage::Open() {
   msclr::lock lock(_syncRoot);
   if( _isOpen )
      return 0;
   String^ fileName = GetFullFileName();
   
   _szInBytes = ComputeFileSizeInBytes(fileName);
   String^ mapExtension = GetFileExtension();
   String^ mapName = String::Format("{0}{1}_{2}", _stationId, _date.ToString("yyyyMMdd"), mapExtension);

   marshal_context context;
   LPCTSTR pMapName = context.marshal_as<const TCHAR*>(mapName);

   {
      msclr::lock lock( _openLock );
         // Try to see if another storage instance has requested the same memory-mapped file and share it
         _hMapping = OpenFileMapping(FILE_MAP_READ | FILE_MAP_WRITE, FALSE, pMapName);
         if( !_hMapping ) {
            // This is the first instance acquiring the file
            LPCTSTR pFileName = context.marshal_as<const TCHAR*>(fileName);
            // Try to open the existing file, or create new one if not exists
            _hFile = CreateFile(pFileName, 
                                GENERIC_READ | GENERIC_WRITE, 
                                FILE_SHARE_READ,
                                NULL,
                                OPEN_ALWAYS,
                                FILE_ATTRIBUTE_NORMAL,
                                NULL);
            if( !_hFile )
               throw gcnew IOException(String::Format(Strings::CreateFileFailed, GetLastError(), _stationId));
            _hMapping = CreateFileMapping(_hFile, 
                                          NULL,
                                          PAGE_READWRITE | SEC_COMMIT,
                                          0,
                                          _szInBytes,
                                          pMapName);
            if( !_hMapping ) 
               throw gcnew IOException(String::Format(Strings::CreateMappingFailed, GetLastError(), _stationId));
            _usingSharedFile = false;
         } else {
            _usingSharedFile = true;
         }
      }


   _pData = (UInt32*)::MapViewOfFile(_hMapping, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, 0);

   if( !_pData ) 
      throw gcnew IOException(String::Format(Strings::MapViewOfFileFailed, ::GetLastError(), _stationId));
   
   // warm up the view by touching every page
   Int32 dummy = 0;
   for( int i = 0; i < _szInBytes / sizeof(Int32); i+= 1024 ) {
      dummy ^=  _pData[i];
   }
   // return the dummy value to prevent the optimizer from removing the loop
   _isOpen = true;
   return 0;
}

void StationHashStorage::Cleanup() {
     if( !_disposed ) {
      // dispose unmanaged resources here
      if( _pData ) {
         if( !UnmapViewOfFile(_pData) ) 
            LOG_ERROR(Strings::UnmapViewOfFileFailed, ::GetLastError(), _stationId);
         _pData = NULL;
      }

      if( _hMapping ) {
         if( !CloseHandle(_hMapping) ) 
            LOG_ERROR(Strings::CloseMappingFailed, ::GetLastError(), _stationId);
         _hMapping = NULL;
      }


      if( _hFile ) {
         if( !CloseHandle(_hFile) ) 
            LOG_ERROR(Strings::CloseFileFailed, ::GetLastError(), _stationId);
         _hFile = NULL;
      }
      _disposed = true;
   }
}

honey the codewitch wrote:

it's mainly because you can't use pointers in C#, and even if you use unsafe, you cannot pin objects to specific addresses in memory

honey the codewitch wrote:

No I'm telling you i don't need your lectures about the very basics of how .NET works.

honey the codewitch wrote:

I don't care if you find me credible

honey the codewitch wrote:

your opinion doesn't matter to me.

honey the codewitch wrote:

If that were to change, we'll talk.

Rajesh R Subramanian wrote:

No, thank you.

honey the codewitch wrote:

Nobody made you respond to me.

honey the codewitch wrote:

Now I'm blocking you so I don't have to listen to this anymore.

TheGreatAndPowerfulOz wrote:

ou started this buddy by being a complete dick and jerk to another member here

TheGreatAndPowerfulOz wrote:

You can finish it by just saying "I'm sorry -- won't happen again." Not to me, but to the other member. Or you can just sod-off.

TheGreatAndPowerfulOz wrote:

xpect to be treated by me like I see you treating others

Rajesh R Subramanian wrote:

That's what you did, not me.


I had an argument with another member (admittedly heated),

Rajesh R Subramanian wrote:

I should care? I might have had to take you seriously if you had anything to show as your own contribution to this community,

int[] foo = new int[1000000];

int[] foo = new int[500000000];