public SerialReadWriteEvent serial_waitforevent(IntPtr handle, SerialReadWriteEvent rwevent, int timeout)
{
SerialReadWriteEvent result = nserial_waitforevent(handle, rwevent, timeout);
errno = Marshal.GetLastWin32Error();
return(result);
}
public SerialReadWriteEvent serial_waitforevent(SafeSerialHandle handle, SerialReadWriteEvent rwevent, int timeout)
{
SerialReadWriteEvent result = UnsafeNativeMethods.serial_waitforevent(handle, rwevent, timeout);
errno = Marshal.GetLastWin32Error();
return(result);
}
internal static extern SerialReadWriteEvent serial_waitforevent(SafeSerialHandle handle, SerialReadWriteEvent rwevent, int timeout);
private unsafe void ReadWriteThread()
{
WaitHandle[] handles = new WaitHandle[] {
m_StopRunning,
m_Buffer.Serial.ReadBufferNotFull,
m_Buffer.Serial.WriteBufferNotEmpty
};
m_Buffer.WriteEvent += SerialBufferWriteEvent;
while (m_IsRunning) {
SerialReadWriteEvent rwevent = SerialReadWriteEvent.NoEvent;
int handle = WaitHandle.WaitAny(handles, -1);
switch (handle) {
case 0: // StopRunning - Should abort
m_IsRunning = false;
continue;
}
// These are not in the switch statement to ensure that we can actually
// read/write simultaneously.
if (m_Buffer.Serial.ReadBufferNotFull.WaitOne(0)) {
rwevent |= SerialReadWriteEvent.ReadEvent;
}
if (m_Buffer.Serial.WriteBufferNotEmpty.WaitOne(0)) {
rwevent |= SerialReadWriteEvent.WriteEvent;
}
SerialReadWriteEvent result = m_Dll.serial_waitforevent(m_Handle, rwevent, 500);
if (result == SerialReadWriteEvent.Error) {
if (Log.SerialTrace(System.Diagnostics.TraceEventType.Error))
Log.Serial.TraceEvent(System.Diagnostics.TraceEventType.Error, 0,
"{0}: ReadWriteThread: Error waiting for event; errno={1}; description={2}",
m_Name, m_Dll.errno, m_Dll.serial_error(m_Handle));
m_IsRunning = false;
continue;
} else if (Log.SerialTrace(System.Diagnostics.TraceEventType.Verbose)) {
Log.Serial.TraceEvent(System.Diagnostics.TraceEventType.Verbose, 0,
"{0}: ReadWriteThread: serial_waitforevent({1}, {2}) == {3}",
m_Name, m_HandlePtr, rwevent, result);
}
if ((result & SerialReadWriteEvent.ReadEvent) != 0) {
int rresult;
fixed (byte* b = m_Buffer.Serial.ReadBuffer.Array) {
byte* bo = b + m_Buffer.Serial.ReadBuffer.End;
int length = m_Buffer.Serial.ReadBuffer.WriteLength;
rresult = m_Dll.serial_read(m_Handle, (IntPtr)bo, length);
if (rresult < 0) {
if (Log.SerialTrace(System.Diagnostics.TraceEventType.Error))
Log.Serial.TraceEvent(System.Diagnostics.TraceEventType.Error, 0,
"{0}: ReadWriteThread: Error reading data; errno={1}; description={2}",
m_Name, m_Dll.errno, m_Dll.serial_error(m_Handle));
m_IsRunning = false;
continue;
} else {
if (Log.SerialTrace(System.Diagnostics.TraceEventType.Verbose))
Log.Serial.TraceEvent(System.Diagnostics.TraceEventType.Verbose, 0,
"{0}: ReadWriteThread: serial_read({1}, {2}, {3}) == {4}",
m_Name, m_HandlePtr, (IntPtr)bo, length, rresult);
if (rresult > 0) m_Buffer.Serial.ReadBufferProduce(rresult);
}
}
if (rresult > 0) OnDataReceived(this, new SerialDataReceivedEventArgs(SerialData.Chars));
}
if ((result & SerialReadWriteEvent.WriteEvent) != 0) {
int wresult;
fixed (byte * b = m_Buffer.Serial.WriteBuffer.Array) {
byte* bo = b + m_Buffer.Serial.WriteBuffer.Start;
int length = m_Buffer.Serial.WriteBuffer.ReadLength;
wresult = m_Dll.serial_write(m_Handle, (IntPtr)bo, length);
if (wresult < 0) {
if (Log.SerialTrace(System.Diagnostics.TraceEventType.Error))
Log.Serial.TraceEvent(System.Diagnostics.TraceEventType.Error, 0,
"{0}: ReadWriteThread: Error writing data; errno={1}; description={2}",
m_Name, m_Dll.errno, m_Dll.serial_error(m_Handle));
m_IsRunning = false;
} else {
if (Log.SerialTrace(System.Diagnostics.TraceEventType.Verbose))
Log.Serial.TraceEvent(System.Diagnostics.TraceEventType.Verbose, 0,
"{0}: ReadWriteThread: serial_write({1}, {2}, {3}) == {4}",
m_Name, m_HandlePtr, (IntPtr)bo, length, wresult);
if (wresult > 0) {
m_Buffer.Serial.WriteBufferConsume (wresult);
m_Buffer.Serial.TxEmptyEvent ();
}
}
}
}
}
m_Buffer.WriteEvent -= SerialBufferWriteEvent;
// Clear the write buffer. Anything that's still in the driver serial buffer will continue to write. The I/O was cancelled
// so no need to purge the actual driver itself.
m_Buffer.Serial.Purge();
// We must notify the stream that any blocking waits should abort.
m_Buffer.Serial.DeviceDead();
}
private static extern SerialReadWriteEvent nserial_waitforevent(IntPtr handle, SerialReadWriteEvent rwevent, int timeout);
