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Hang in WritePipe()

Subject: Hang in WritePipe()
From: Steve Baxter <email@hidden>
Date: Fri, 2 Mar 2007 10:19:34 +0000
Delivered-to: email@hidden
Delivered-to: email@hidden

Hi,

We very intermittently get a hang in our software when writing to a particular device. It will work fine for days talking to the device many times per second, but then suddenly it will fail with this callstack:

268 Thread_1703 268 _pthread_body 268 MPosixThreadImp::ThreadEntry(void*) 268 MThread::RunThread() 268 XThread::RunThread() 268 XDeviceValuePoller::RunThreadSelf() 268 XLudlXYStage::PollDeviceValue(XDevice::XDeviceID) 268 XLudlController::SendHighLevelCommand(XString const&, XSerialPort const&, unsigned long) 268 XSerialPort::WriteData(void const*, unsigned long) const 268 MUSBSerialPort::WriteDataSelf(void const*, unsigned long) const 268 MUSBDevice::WritePipe(long, void const*, unsigned long) const 268 IOUSBInterfaceClass::WritePipe (unsigned char, void*, unsigned long, unsigned long, unsigned long) 268 io_connect_method_scalarI_structureI 268 mach_msg 268 mach_msg_trap 268 mach_msg_trap

Unfortunately the customer and the troublesome device are many thousands of miles away. Does anyone have any clues as to what might cause a hang like this in WritePipe()? This is probably a problem at the firmware end, but we would like to give the manufacturers some clues if we can!

Cheers,

Steve

Steve Baxter
Software Development Manager
Improvision
+44-2476-692229

Image Processing and Vision Company Limited (trading as Improvision) is a company registered in England and Wales with company number 2505778. VAT number GB536188722.

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