private SafeFileHandle CreateHandle(int segmentId)
{
uint fileAccess = Native32.GENERIC_READ | Native32.GENERIC_WRITE;
uint fileShare = unchecked (((uint)FileShare.ReadWrite & ~(uint)FileShare.Inheritable));
uint fileCreation = unchecked ((uint)FileMode.OpenOrCreate);
uint fileFlags = Native32.FILE_FLAG_OVERLAPPED;
fileFlags = fileFlags | Native32.FILE_FLAG_NO_BUFFERING;
if (deleteOnClose)
{
fileFlags = fileFlags | Native32.FILE_FLAG_DELETE_ON_CLOSE;
// FILE_SHARE_DELETE allows multiple FASTER instances to share a single log directory and each can specify deleteOnClose.
// This will allow the files to persist until all handles across all instances have been closed.
fileShare = fileShare | Native32.FILE_SHARE_DELETE;
}
var logHandle = Native32.CreateFileW(
GetSegmentName(segmentId),
fileAccess, fileShare,
IntPtr.Zero, fileCreation,
fileFlags, IntPtr.Zero);
if (logHandle.IsInvalid)
{
var error = Marshal.GetLastWin32Error();
throw new IOException($"Error creating log file for {GetSegmentName(segmentId)}, error: {error}", Native32.MakeHRFromErrorCode(error));
}
if (preallocateFile)
{
SetFileSize(FileName, logHandle, segmentSize);
}
try
{
ThreadPool.BindHandle(logHandle);
}
catch (Exception e)
{
throw new Exception("Error binding log handle for " + GetSegmentName(segmentId) + ": " + e.ToString());
}
return(logHandle);
}
/// <summary>
/// Creates a SafeFileHandle for the specified segment. This can be used by derived classes to prepopulate logHandles in the constructor.
/// </summary>
protected internal static SafeFileHandle CreateHandle(int segmentId, bool disableFileBuffering, bool deleteOnClose, bool preallocateFile, long segmentSize, string fileName, IntPtr ioCompletionPort)
{
uint fileAccess = Native32.GENERIC_READ | Native32.GENERIC_WRITE;
uint fileShare = unchecked (((uint)FileShare.ReadWrite & ~(uint)FileShare.Inheritable));
uint fileCreation = unchecked ((uint)FileMode.OpenOrCreate);
uint fileFlags = Native32.FILE_FLAG_OVERLAPPED;
if (disableFileBuffering)
{
fileFlags = fileFlags | Native32.FILE_FLAG_NO_BUFFERING;
}
if (deleteOnClose)
{
fileFlags = fileFlags | Native32.FILE_FLAG_DELETE_ON_CLOSE;
// FILE_SHARE_DELETE allows multiple FASTER instances to share a single log directory and each can specify deleteOnClose.
// This will allow the files to persist until all handles across all instances have been closed.
fileShare = fileShare | Native32.FILE_SHARE_DELETE;
}
var logHandle = Native32.CreateFileW(
GetSegmentName(fileName, segmentId),
fileAccess, fileShare,
IntPtr.Zero, fileCreation,
fileFlags, IntPtr.Zero);
if (logHandle.IsInvalid)
{
var error = Marshal.GetLastWin32Error();
throw new IOException($"Error creating log file for {GetSegmentName(fileName, segmentId)}, error: {error}", Native32.MakeHRFromErrorCode(error));
}
if (preallocateFile && segmentSize != -1)
{
SetFileSize(fileName, logHandle, segmentSize);
}
if (ioCompletionPort != IntPtr.Zero)
{
ThreadPool.GetMaxThreads(out int workerThreads, out _);
Native32.CreateIoCompletionPort(logHandle, ioCompletionPort, (UIntPtr)(long)logHandle.DangerousGetHandle(), (uint)(workerThreads + NumCompletionThreads));
}
else
{
try
{
ThreadPool.BindHandle(logHandle);
}
catch (Exception e)
{
throw new FasterException("Error binding log handle for " + GetSegmentName(fileName, segmentId) + ": " + e.ToString());
}
}
return(logHandle);
}
