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two tasks block on rtems_termios_write()
- Date: Thu, 10 Oct 2002 10:50:14 +0800
- From: yangke at utstar.com (Yang Ke)
- Subject: two tasks block on rtems_termios_write()
> Yang Ke wrote:
> > Hello,
> > with unknown reason, two tasks in my system (rtems on PPC8260)
> > blocks on trying to acquire the semaphore. i dump the call stacks
> > of these two tasks :
> > task A:
> > fputs->
> > ........... ->console_write->rtems_termios_write->rtems_semaphore_obtain
> > ->_Thread_Enable_dispatch->_Thread_Dispatch
> > task B:
> > vfprintf-> ......>console_write->rtems_termios_write->rtems_termio_puts
> > -> rtems_semaphore_obtain->_Thread_Enable_dispatch->_Thread_Dispatch
> > this problem occurs very occasionally and i was not able to reproduce it
> > in certain steps. from the callstack, looks like deallock happened
> > somewhere.
> > did anybody meet the same problem ? and any clues ?
> Can you give us your version number and target processor so we can check
> if any relevant bug fixes have occurred.
version 4.5.0 , target processor is PowerPC8260.