Experimental Physics and Industrial Control System
On Tuesday, November 26, 2002, at 06:09 PM, Till Straumann wrote:
Here's yet another idea how the runaway-task problem could be solved.
AFAIK, most OS provide a hook into the system timer ISR but not
into the console ISR [which makes what we discussed at JLAB less
portable] - these hooks are vxWorks' watchdog timers, RTEMS'
rtems_timers.
1) The shell task periodically resets (pets) a 'watchdog' counter.
How would this mesh with libtecla/libreadline? The shell task spends
most of its time blocked in these libraries waiting for input. How
could it reset the watchdog timer? (First person that says 'select'
gets a big raspberry from me!!!!)
2) A timer ISR increments 'watchdog'. Should 'watchdog' reach a
critical
'limit', this implies that the shell had no chance to pet.
In this case, the ISR increments the task's priority and resets
'watchdog'.
If a task with a priority > shell runs away, 2) will eventually raise
the shell's priority above the runaway task's and the user will regain
control.
--
Eric Norum <[email protected]>
Department of Electrical Engineering
University of Saskatchewan
Saskatoon, Canada.
Phone: (306) 966-5394 FAX: (306) 966-5407
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