Problem when suspending a task.

[wenorum at lbl.gov (Eric Norum)]

There are lots of places in the I/O code where a mutex is held.   Suspending or destroying another task while it's holding a mutex is a sure way to lock up the system.   You should rethink your design and determine some way to avoid such operations except from within the task itself.
-- 
Eric Norum
wenorum at lbl.gov
On Jan 6, 2010, at 5:55 AM, Nick Thomas wrote:

> Hi,
> 
> Not much to go on with this, but I am suffering from a weird problem shortly
> after a task is suspended using rtems_task_suspend.
> 
> The problem is that lots of other tasks appear hung too, not just the one I
> wanted to suspend.
> This includes the rtems monitor task, so getting info out of the unit is
> very difficult.
> 
> I don't really know where to start looking for the cause of this issue.
> 
> Bizarrely, the task which is being suspended has a lot of printf statements.
> If I remove these printf statements then the problem doesn't happen and the
> unit continues to function normally.
> 
> Is there a problem when suspending a task when it is in the middle of a
> printf statement?
> 
> 
> Regards
> 
> Nick
> 
> -----------------------------
> Nick Thomas
> Email: nick.thomas at pixsan.com 
> 
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-- 
Eric Norum
wenorum at lbl.gov