public static LowResolutionStopwatch StartNew()
{
LowResolutionStopwatch sw = new LowResolutionStopwatch();
sw.Start();
return(sw);
}
/// <summary>
/// Construct a TimedStream
/// </summary>
/// <param name="baseStream"> Undelying stream</param>
public TimedStream(Stream baseStream)
{
this.baseStream = baseStream;
timeout = baseStream.ReadTimeout;
isClosed = false;
stopwatch = new LowResolutionStopwatch();
}
public override int Read(byte[] buffer, int offset, int count)
{
int timeLeft = readTimeout;
WaitHandle[] waitHandles = { serverWrote, connectionClosed };
LowResolutionStopwatch stopwatch = new LowResolutionStopwatch();
while (bytesLeft == 0)
{
stopwatch.Start();
int index = WaitHandle.WaitAny(waitHandles, timeLeft);
stopwatch.Stop();
if (index == WaitHandle.WaitTimeout)
{
throw new TimeoutException("Timeout when reading from shared memory");
}
if (waitHandles[index] == connectionClosed)
{
throw new MySqlException("Connection to server lost", true, null);
}
if (readTimeout != System.Threading.Timeout.Infinite)
{
timeLeft = readTimeout - (int)stopwatch.ElapsedMilliseconds;
if (timeLeft < 0)
{
throw new TimeoutException("Timeout when reading from shared memory");
}
}
bytesLeft = Marshal.ReadInt32(data.View);
position = 4;
}
int len = Math.Min(count, bytesLeft);
long baseMem = data.View.ToInt64() + position;
for (int i = 0; i < len; i++, position++)
{
buffer[offset + i] = Marshal.ReadByte((IntPtr)(baseMem + i));
}
bytesLeft -= len;
if (bytesLeft == 0)
{
clientRead.Set();
}
return(len);
}
public override void Write(byte[] buffer, int offset, int count)
{
int leftToDo = count;
int buffPos = offset;
WaitHandle[] waitHandles = { serverRead, connectionClosed };
LowResolutionStopwatch stopwatch = new LowResolutionStopwatch();
int timeLeft = writeTimeout;
while (leftToDo > 0)
{
stopwatch.Start();
int index = WaitHandle.WaitAny(waitHandles, timeLeft);
stopwatch.Stop();
if (waitHandles[index] == connectionClosed)
{
throw new MySqlException("Connection to server lost", true, null);
}
if (index == WaitHandle.WaitTimeout)
{
throw new TimeoutException("Timeout when reading from shared memory");
}
if (writeTimeout != System.Threading.Timeout.Infinite)
{
timeLeft = writeTimeout - (int)stopwatch.ElapsedMilliseconds;
if (timeLeft < 0)
{
throw new TimeoutException("Timeout when writing to shared memory");
}
}
int bytesToDo = Math.Min(leftToDo, BUFFERLENGTH);
long baseMem = data.View.ToInt64() + 4;
Marshal.WriteInt32(data.View, bytesToDo);
Marshal.Copy(buffer, buffPos, (IntPtr)baseMem, bytesToDo);
buffPos += bytesToDo;
leftToDo -= bytesToDo;
if (!clientWrote.Set())
{
throw new MySqlException("Writing to shared memory failed");
}
}
}
public void Open(string path, FileAccess mode, uint timeout)
{
IntPtr nativeHandle;
for (; ;)
{
NativeMethods.SecurityAttributes security = new NativeMethods.SecurityAttributes();
security.inheritHandle = true;
security.Length = Marshal.SizeOf(security);
nativeHandle = NativeMethods.CreateFile(path, NativeMethods.GENERIC_READ | NativeMethods.GENERIC_WRITE,
0, security, NativeMethods.OPEN_EXISTING, NativeMethods.FILE_FLAG_OVERLAPPED, 0);
if (nativeHandle != IntPtr.Zero)
{
break;
}
if (Marshal.GetLastWin32Error() != ERROR_PIPE_BUSY)
{
throw new Win32Exception(Marshal.GetLastWin32Error(),
"Error opening pipe");
}
LowResolutionStopwatch sw = LowResolutionStopwatch.StartNew();
bool success = NativeMethods.WaitNamedPipe(path, timeout);
sw.Stop();
if (!success)
{
if (timeout < sw.ElapsedMilliseconds ||
Marshal.GetLastWin32Error() == ERROR_SEM_TIMEOUT)
{
throw new TimeoutException("Timeout waiting for named pipe");
}
else
{
throw new Win32Exception(Marshal.GetLastWin32Error(),
"Error waiting for pipe");
}
}
timeout -= (uint)sw.ElapsedMilliseconds;
}
handle = new SafeFileHandle(nativeHandle, true);
fileStream = new FileStream(handle, mode, 4096, true);
}
public static LowResolutionStopwatch StartNew()
{
LowResolutionStopwatch sw = new LowResolutionStopwatch();
sw.Start();
return sw;
}
public override void Write(byte[] buffer, int offset, int count)
{
int leftToDo = count;
int buffPos = offset;
WaitHandle[] waitHandles = { serverRead, connectionClosed };
LowResolutionStopwatch stopwatch = new LowResolutionStopwatch();
int timeLeft = writeTimeout;
while (leftToDo > 0)
{
stopwatch.Start();
int index = WaitHandle.WaitAny(waitHandles, timeLeft);
stopwatch.Stop();
if (waitHandles[index] == connectionClosed)
throw new MySqlException("Connection to server lost", true, null);
if (index == WaitHandle.WaitTimeout)
throw new TimeoutException("Timeout when reading from shared memory");
if (writeTimeout != System.Threading.Timeout.Infinite)
{
timeLeft = writeTimeout - (int)stopwatch.ElapsedMilliseconds;
if (timeLeft < 0)
throw new TimeoutException("Timeout when writing to shared memory");
}
int bytesToDo = Math.Min(leftToDo, BUFFERLENGTH);
long baseMem = data.View.ToInt64() + 4;
Marshal.WriteInt32(data.View, bytesToDo);
Marshal.Copy(buffer, buffPos, (IntPtr)baseMem, bytesToDo);
buffPos += bytesToDo;
leftToDo -= bytesToDo;
if (!clientWrote.Set())
throw new MySqlException("Writing to shared memory failed");
}
}
public override int Read(byte[] buffer, int offset, int count)
{
int timeLeft = readTimeout;
WaitHandle[] waitHandles = { serverWrote, connectionClosed };
LowResolutionStopwatch stopwatch = new LowResolutionStopwatch();
while (bytesLeft == 0)
{
stopwatch.Start();
int index = WaitHandle.WaitAny(waitHandles, timeLeft);
stopwatch.Stop();
if (index == WaitHandle.WaitTimeout)
throw new TimeoutException("Timeout when reading from shared memory");
if (waitHandles[index] == connectionClosed)
throw new MySqlException("Connection to server lost", true, null);
if (readTimeout != System.Threading.Timeout.Infinite)
{
timeLeft = readTimeout - (int)stopwatch.ElapsedMilliseconds;
if (timeLeft < 0)
throw new TimeoutException("Timeout when reading from shared memory");
}
bytesLeft = Marshal.ReadInt32(data.View);
position = 4;
}
int len = Math.Min(count, bytesLeft);
long baseMem = data.View.ToInt64() + position;
for (int i = 0; i < len; i++, position++)
buffer[offset + i] = Marshal.ReadByte((IntPtr)(baseMem + i));
bytesLeft -= len;
if (bytesLeft == 0)
clientRead.Set();
return len;
}
