nanosleep blocks inifinity (internal rtems deathlock?) even CPU is in idle Task

Sebastian Huber sebastian.huber at
Thu Nov 15 13:52:04 UTC 2012

On 11/15/2012 01:26 PM, Matthias Goldhoorn wrote:
> On 15.11.2012 11:52, Sebastian Huber wrote:
>> On 11/15/2012 10:44 AM, Matthias Goldhoorn wrote:
>>> Hello Again,
>>> new Problem i got the debugger working (will port it later to the wiki, needed
>>> adaptations for the compiler and mentioned scripts).
>>> It seems there is an bugg inside of rtems. My Code calls nanosleep and never
>>> returnes from there.
>>> My main-cread is idling, so there is no higher priority process running. I
>>> wonder why my thread which has called nanosleep never returns...
>>> Any suggestions?
>> Do you have a clock driver configured, e.g.
>> [...]
>> #include <rtems/confdefs.h>
> Yeah it's both defined.
> The nanosleep sometimes (mostly) works.
> Only if some interrupts during the sleep i got this non-awaking behavior it
> seems strange.
> Maybe broke my memory or stack anywhere. Could you tell me where the scheduler
> of rtems is located to that i can define a breakpoint into him and check why my
> thread is not waked up.
> I searching the timer interrupt function that really does the thread management.

Which BSP do you use and which RTEMS version?

You can set a break point to rtems_clock_tick() to see if the system timer 
works.  It should update the timer of the nanosleep() task and wake it up 

Sebastian Huber, embedded brains GmbH

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