public DataFile(string filePath, long initialSize, int growthIncrement)
{
try
{
bool isNew = !File.Exists(filePath);
memoryMapper = new MemoryMapper(filePath, initialSize);
mapping = MemoryMapping.Create(memoryMapper.fs, Constants.AllocationGranularity);
dataFileHeaderPointer = (DataFileHeader *)mapping.GetBaseAddress();
this.growthIncrement = (growthIncrement + Constants.AllocationGranularityMask) / Constants.AllocationGranularity * Constants.AllocationGranularity;
if (isNew)
{
InitializeHeader();
}
else
{
ValidateHeader();
}
}
catch
{
Dispose();
throw;
}
}
internal void AddMapping(MemoryMapping mapping)
{
try { }
// prevent ThreadAbortException from corrupting mappings collection
finally
{
mappings.Add(mapping);
mapping.AddRef();
baseAddress = mapping.GetBaseAddress();
BaseAddressChanged?.Invoke(this, new BaseAddressChangedEventArgs(baseAddress));
}
}
public byte *Grow(long bytesToGrow)
{
CheckDisposed();
lock (SyncObject)
{
CheckDisposed();
var newMapping = MemoryMapping.Grow(bytesToGrow, mapping);
if (mapping != newMapping)
{
var oldMapping = mapping;
mapping = newMapping;
oldMapping.Release();
foreach (var session in sessions)
{
session.AddMapping(newMapping);
}
}
return(mapping.GetBaseAddress());
}
}