Re: PPC 2003 Thread

Hi Tobey,

Here it is for you...


// Create a read thread for reading data from the communication port. This
section
// of code is part of one of the clsSerialControl class memeber function
// hReadThread and hCommPort are private member variables
.....
hReadThread = CreateThread (NULL, 0x100000, PortReadThread, this, 0,
&dwThreadID);
if(hReadThread == NULL)
{
// Could not create the read thread.
}
//Bump the thread priority up.
SetThreadPriority(hReadThread, THREAD_PRIORITY_TIME_CRITICAL);
.....

DWORD WINAPI PortReadThread (LPVOID lpvoid)
{
BYTE Byte;
DWORD dwBytesTransferred,dwCommModemStatus;
BOOL bReadResult;
COMSTAT cs;
DWORD dwError;

clsSerialControl *pNCP = (clsSerialControl *) lpvoid;

while (pNCP->hCommPort != INVALID_HANDLE_VALUE)
{
// Specify a set of events to be monitored for the port.
SetCommMask (pNCP->hCommPort, EV_RXCHAR|EV_ERR);

// Wait for an event to occur for the port.
if (WaitCommEvent(pNCP->hCommPort, &dwCommModemStatus, 0) != 0)
{
if (dwCommModemStatus & EV_RXCHAR)
{
// Loop for waiting for the data.
do
{
// Read the data from the serial port.
bReadResult = ReadFile(pNCP->hCommPort, &Byte, 1,
&dwBytesTransferred, 0);
if(bReadResult && (dwBytesTransferred == 1))
pNCP->gbInputBuffer.PutByte(Byte);
}while(bReadResult && (dwBytesTransferred == 1));
}
else
{
ClearCommError(pNCP->hCommPort,&dwError,&cs);
}
}
}

ExitThread(0);
return 0;
}

BOOL clsSerialControl::CloseCommPort()
{
DWORD dwError;
HANDLE hClosePort;

if (hCommPort != INVALID_HANDLE_VALUE)
{
hClosePort = hCommPort;
hCommPort = INVALID_HANDLE_VALUE;

// Close the communication port.
if (!CloseHandle (hClosePort))
{
dwError = GetLastError ();
return FALSE;
}
WaitForSingleObject(hReadThread, INFINITE);
}
return TRUE;
}

Thanks,
-Channa.

"Paul G. Tobey [eMVP]" wrote:

> At a guess, because you're waiting on the wrong handle. Show us a 30 line
> or less sample, including the thread procedure, which demonstrates the
> problem.
>
> Paul T.
>
> "Channa" <Channa@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
> news:F24C0CD4-49AA-4C6F-BBF9-2A5A39AD1A67@xxxxxxxxxxxxxxxx
> > Hi,
> >
> > I have an app created originally for PPC 2002 using eVC++ v3.0 and, it
> > has been migrated to PPC 2003 platform using eVC++ v4.0.
> >
> > I have been noticing some odd behaviour since recently, and thought of
> > asking if anybody else have experienced the same and worked around
> > already? I
> > have a separate thread reading the COM port. I am noticing that although
> > this
> > thread exit normally, the main process do not get signaled state (using
> > WaitForSingleObject INFINITEly)!
> >
> > I did trace using Kernel Tracker tool and noticed that the two threads
> > (main- and the COM-port-reading-thread) got blocked. I used to use
> > "return"
> > for exiting the COM port reading thread. So, I changed it to ExitThread(),
> > and now, the COM port reading thread get terminated but the main process
> > do
> > not get signaled and the Kernel Tracker tool shows that my main thread is
> > still being blocked. I have no idea is to why?
> >
> > Any input would be appreciated.
> > Thanks in advance,
> > -Channa.
> >
>
>
>
.

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