void SendNxtMessagesThread(ThreadContext ctx)
{
System.Threading.Thread.CurrentThread.Name = "Connection.SendNxtMessagesThread";
WaitHandle[] waitHandles = new WaitHandle[2];
waitHandles[0] = this.MessageToSendSemaphore;
waitHandles[1] = ctx.StopEvent;
//
// We throttle the sends a little bit in order to avoid overwhelming a samantha.
// Without this throttle, QueryAvailableNXTData has been observed to overwhelm the
// samantha at times and to drop messages and / or replies (not sure which).
//
// However (heuristic): we only throttle sends when we've got a bit of queue backed up
//
int msThrottle = (this.msgReplyTargets.Count > 3) ? 3 : 0;
int msPrev = 0;
//
while (!ctx.StopRequest)
{
int iWait = WaitHandle.WaitAny(waitHandles);
//
switch (iWait)
{
case 0: // MessageToSendSemaphore
{
NxtMessage msg = null;
lock (this.nxtMessagesToSend)
{
msg = this.nxtMessagesToSend[0];
this.nxtMessagesToSend.RemoveAt(0);
}
//
int msNow = System.Environment.TickCount;
int dms = msPrev + msThrottle - msNow;
if (dms > 0)
{
System.Threading.Thread.Sleep(dms);
msNow = System.Environment.TickCount;
}
//
this.Send(msg);
msPrev = msNow;
break;
}
case 1: // StopEvent
break;
// end switch
}
}
}
void PostTelemetryRecordsThread(ThreadContext ctx)
// Forward incoming telemetry records on to Microsoft Excel
{
System.Threading.Thread.CurrentThread.Name = "Connection.PostTelemetryRecordsThread";
bool fDone = false;
//
WaitHandle[] waitHandles = new WaitHandle[2];
waitHandles[0] = this.TelemetryRecordAvailableEvent;
waitHandles[1] = ctx.StopEvent;
//
for (; !ctx.StopRequest && !fDone ;)
{
int iWait = WaitHandle.WaitAny(waitHandles);
switch (iWait)
{
case 0: // TelemetryRecordAvailableEvent
{
// There's one or more records there to read.
// Read all that we can.
for (;!fDone;)
{
TelemetryRecord telemetryRecord = null;
lock (this.TelemetryRecords)
{
if (0 == this.TelemetryRecords.Count)
break;
telemetryRecord = this.TelemetryRecords[0];
this.TelemetryRecords.RemoveAt(0);
}
telemetryRecord.Parse();
//
if (telemetryRecord.fEndOfRecordSet)
{
// If DATUM_TYPE.EOF has been transmitted then subsequent
// telemetry records received will go to a new spreadsheet
//
Program.TheForm.DisconnectTelemetryDestination();
}
else if (telemetryRecord.data.Count == 0)
{
// Empty records don't do anything
}
else
{
// Non-emptry records are posted to the appropriate worksheet
//
TelemetryFTCUI.ShowWaitCursorWhile(() =>
{
Program.TheForm.OpenTelemetryDestinationIfNecessary();
});
telemetryRecord.PostToSheet();
}
}
break;
}
case 1: // StopEvent
break;
// end switch
}
}
}
public virtual void Close()
{
if (null != this.sendNxtMessagesThread) this.sendNxtMessagesThread.Stop();
if (null != this.postTelemetryMessagesThread) this.postTelemetryMessagesThread.Stop();
this.sendNxtMessagesThread = null;
this.postTelemetryMessagesThread = null;
}
public virtual bool Open(bool fTraceFailure=true)
{
if (null == this.sendNxtMessagesThread)
{
this.sendNxtMessagesThread = new ThreadContext((ctx) => SendNxtMessagesThread((ThreadContext)ctx));
this.sendNxtMessagesThread.Start();
}
//
if (null == this.postTelemetryMessagesThread)
{
this.postTelemetryMessagesThread = new ThreadContext((ctx) => PostTelemetryRecordsThread((ThreadContext)ctx));
this.postTelemetryMessagesThread.Start();
}
//
return true;
}
//--------------------------------------------------------------------------
// Data reception
//--------------------------------------------------------------------------
unsafe void ReadThread(ThreadContext ctx)
{
System.Threading.Thread.CurrentThread.Name = "BluetoothConnection.ReadThread";
EventWaitHandle asyncReadCompleteEvent = new EventWaitHandle(false, System.Threading.EventResetMode.ManualReset);
NativeOverlapped* pNativeOverlapped = null;
byte[] rgbBuffer = new byte[64];
try {
WaitHandle[] waitHandles = new WaitHandle[2];
waitHandles[0] = asyncReadCompleteEvent;
waitHandles[1] = ctx.StopEvent;
//
while (!ctx.StopRequest)
{
// Issue an async read
//
asyncReadCompleteEvent.Reset();
Overlapped overlapped = new Overlapped(0, 0, asyncReadCompleteEvent.SafeWaitHandle.DangerousGetHandle(), null);
pNativeOverlapped = overlapped.Pack(null, rgbBuffer);
int cbRead = 0;
bool fSuccess = ReadFile(this.hSerialPort, rgbBuffer, rgbBuffer.Length, out cbRead, new IntPtr(pNativeOverlapped));
readThreadRunning.Set();
if (!fSuccess)
{
int err = Marshal.GetLastWin32Error();
if (err != ERROR_IO_PENDING)
ThrowWin32Error(err);
}
// Wait until either the async read completes or we're asked to stop
int iWait = WaitHandle.WaitAny(waitHandles);
// Process according to which event fired
switch (iWait)
{
case 0: // Async read completed
{
ThrowIfFail(GetOverlappedResult(this.hSerialPort, new IntPtr(pNativeOverlapped), ref cbRead, System.Convert.ToByte(true)));
// Program.Trace("async read complete: 0x{0:08X} 0x{1:08X} cb={2}", new IntPtr(pNativeOverlapped), this.hSerialPort, cbRead);
// Record the new data and process any packets that are now complete
this.RecordIncomingData(rgbBuffer, cbRead);
ProcessPacketIfPossible();
System.Threading.Overlapped.Free(pNativeOverlapped);
pNativeOverlapped = null;
}
break;
case 1: // StopEvent
break;
// end switch
}
}
}
finally
{
CancelIo(this.hSerialPort);
asyncReadCompleteEvent.Close();
if (pNativeOverlapped != null)
{
System.Threading.Overlapped.Free(pNativeOverlapped);
pNativeOverlapped = null;
}
}
}
//--------------------------------------------------------------------------
// Data Reception
//--------------------------------------------------------------------------
// http://www.beefycode.com/post/Using-Overlapped-IO-from-Managed-Code.aspx
#pragma warning disable 0618 // warning CS0618: 'System.Threading.WaitHandle.Handle' is obsolete: 'Use the SafeWaitHandle property instead.'
unsafe void ReadThread(ThreadContext ctx)
{
System.Threading.Thread.CurrentThread.Name = "USBConnection.ReadThread";
EventWaitHandle asyncReadCompleteEvent = new EventWaitHandle(false, System.Threading.EventResetMode.ManualReset);
NativeOverlapped* pNativeOverlapped = null;
byte[] rgbBuffer = new byte[64];
try {
WaitHandle[] waitHandles = new WaitHandle[2];
waitHandles[0] = asyncReadCompleteEvent;
waitHandles[1] = ctx.StopEvent;
//
// If we get unexpected errors, we stop reading; likely these are caused by a device
// in the process of disconnecting.
//
bool fStop = false;
//
while (!fStop && !ctx.StopRequest)
{
// Issue an async read
//
asyncReadCompleteEvent.Reset();
Overlapped overlapped = new Overlapped(0, 0, asyncReadCompleteEvent.Handle, null);
pNativeOverlapped = overlapped.Pack(null, rgbBuffer);
int cbRead = 0;
// Program.Trace("issuing async read: 0x{0:08X} 0x{1:08X}", new IntPtr(pNativeOverlappedWrite), this.hWinUSB);
bool fSuccess = WinUsb_ReadPipe(
this.hWinUSB,
bulkInPipe,
rgbBuffer,
rgbBuffer.Length,
out cbRead,
new IntPtr(pNativeOverlapped));
this.readThreadRunning.Set();
if (!fSuccess)
{
int err = Marshal.GetLastWin32Error();
if (err != ERROR_IO_PENDING)
{
Program.Trace("USB Read: WinUsb_ReadPipe=={0}", err);
fStop = true;
continue;
}
}
// Wait until either the async read completes or we're asked to stop
int iWait = WaitHandle.WaitAny(waitHandles);
// Process according to which event fired
switch (iWait)
{
case 0: // Async read completed
{
// Program.Trace("async read complete: 0x{0:08X} 0x{1:08X}", new IntPtr(pNativeOverlappedWrite), this.hWinUSB);
if (WinUsb_GetOverlappedResult(this.hWinUSB, new IntPtr(pNativeOverlapped), ref cbRead, System.Convert.ToByte(true)))
{
ProcessIncomingPacket(rgbBuffer, cbRead);
}
else
{
int err = Marshal.GetLastWin32Error();
Program.Trace("USB Read: WinUsb_GetOverlappedResult=={0}", err);
fStop = true;
}
//
System.Threading.Overlapped.Free(pNativeOverlapped);
pNativeOverlapped = null;
}
break;
case 1: // StopEvent
// Program.Trace("async read stop requested");
break;
// end switch
}
}
}
finally
{
// Program.Trace("async cleanup: 0x{0:08X} 0x{1:08X}", new IntPtr(pNativeOverlappedWrite), this.hWinUSB);
WinUsb_AbortPipe(this.hWinUSB, bulkInPipe);
asyncReadCompleteEvent.Close();
if (pNativeOverlapped != null)
{
System.Threading.Overlapped.Free(pNativeOverlapped);
pNativeOverlapped = null;
}
}
}
void ReadThread(ThreadContext ctx)
{
System.Threading.Thread.CurrentThread.Name = "IPConnection.ReadThread";
EventWaitHandle asyncReadCompleteEvent = new EventWaitHandle(false, System.Threading.EventResetMode.ManualReset);
SocketAsyncEventArgs socketAsyncEventArgs = new SignallingSocketEventArgs(asyncReadCompleteEvent);
byte[] rgbBuffer = new byte[64];
socketAsyncEventArgs.SetBuffer(rgbBuffer, 0, rgbBuffer.Length);
try {
WaitHandle[] waitHandles = new WaitHandle[2];
waitHandles[0] = asyncReadCompleteEvent;
waitHandles[1] = ctx.StopEvent;
bool fStop = false;
while (!fStop && !ctx.StopRequest)
{
// Issue an async read
//
asyncReadCompleteEvent.Reset();
bool fAsync = true;
this.SocketMonitorLock(() =>
{
fAsync = this.socket.ReceiveAsync(socketAsyncEventArgs);
});
if (!fAsync)
{
// IO operation completed synchronously
asyncReadCompleteEvent.Set();
}
this.readThreadRunning.Set();
// Wait until either the async read completes or we're asked to stop
int iWait = WaitHandle.WaitAny(waitHandles);
// Process according to which event fired
switch (iWait)
{
case 0: // Async read completed
{
if (socketAsyncEventArgs.BytesTransferred > 0)
{
if (socketAsyncEventArgs.SocketError == SocketError.Success)
{
// Program.Trace("IP Read: incoming packet");
ProcessIncomingPacket(rgbBuffer, socketAsyncEventArgs.BytesTransferred);
}
else
{
Program.Trace("IP Read: unexpected async result: cb={0} err={1}", socketAsyncEventArgs.BytesTransferred, socketAsyncEventArgs.SocketError);
fStop = true;
}
}
else
{
// Program.Trace("IP Read: read completed with zero bytes");
}
}
break;
case 1: // StopEvent
// Program.Trace("async read stop requested");
break;
// end switch
}
}
}
finally
{
}
}
