two tasks block on rtems_termios_write()

Joel Sherrill joel.sherrill at
Wed Oct 9 13:42:19 UTC 2002

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.

> Thanks in advance
> yangke

Joel Sherrill, Ph.D.             Director of Research & Development
joel at                 On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
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