private void Worker(AsyncRWLock commLock, CommHelperBase commHelper, LCGen reqLCG, LCGen ansLCG, int pingInterval, CancellationToken token, Action <Exception> pingThreadFailedCallback)
{
using (var taskRunner = new AsyncRunner())
{
var nullBuff = new byte[0];
while (!token.IsCancellationRequested)
{
commLock.EnterWriteLock();
try
{
Answer answer = Answer.Invalid;
taskRunner.AddTask(() => commHelper.SendRequest(ReqType.Ping, reqLCG.GenerateValue(), nullBuff, 0, 0));
taskRunner.AddTask(commHelper.ReceiveAnswer, (obj) => answer = obj);
taskRunner.RunPendingTasks();
if (answer.ansType != AnsType.Pong || answer.seq != ansLCG.GenerateValue())
{
throw new Exception();
}
}
catch (Exception)
{
//try to resync
try { taskRunner.ExecuteTask(commHelper.Resync); }
catch (Exception ex) { pingThreadFailedCallback?.Invoke(ex); return; }
}
finally
{
commLock.ExitWriteLock();
}
try { taskRunner.ExecuteTask(() => Task.Delay(pingInterval, token)); }
catch (TaskCanceledException) { return; }
catch (Exception ex) { pingThreadFailedCallback?.Invoke(ex); return; }
}
}
}
public void ReadTimeoutAsync()
{
const int maxBytesDrop = 100; //drop this max number of bytes to clear port recv-buffer, if any
const int timeoutErrorMS = 100;
var config = new SerialProtocolConfig();
using (var asyncRunner = new AsyncRunner())
using (var serial = new SerialPort(SerialDeviceManagerTests.portName, config.SERIAL_PORT_SPEED, Parity.None, 8, StopBits.One))
{
serial.ReadTimeout = config.CMD_TIMEOUT;
serial.WriteTimeout = config.CMD_TIMEOUT;
serial.Open();
var bytesLeft = maxBytesDrop;
var sw = new Stopwatch();
var tmpBuff = new byte[1];
while (bytesLeft > 0)
{
bool timedOut = false;
//start timer
sw.Restart();
//read byte
try { bytesLeft -= asyncRunner.ExecuteTask(() => serial.BaseStream.ReadAsync(tmpBuff, 0, 1)); }
catch (TimeoutException) { timedOut = true; }
//stop timer
sw.Stop();
//if timed out - measure interval, exit
if (timedOut)
{
Assert.LessOrEqual(Math.Abs(sw.ElapsedMilliseconds - config.CMD_TIMEOUT), timeoutErrorMS);
break;
}
}
if (bytesLeft < 1)
{
throw new Exception("Failed to establish valid test conditions! Aborting test!");
}
}
}
public void Connect()
{
asyncRunner.ExecuteTask(ConnectAsync);
}