execution time in TSR

[Joel Sherrill]

Stan wrote:

> Hi,
> 
> Why is need to limit execution times in Timer Service Routines ?

Because the timers scheduled by rtems_timer_fire_* are executed
inside the clock tick ISR.  If they get heavy, then the system
will spend too long in ISRs.

There is a set of services rtems_timer_server_fire_* which
schedule the TSRs to be executed in the context of a server
task.  It is safer to have longer execution time here but
still there is only one server for the entire set of server
scheduled TSRs.

>         Stan .
> 

--joel
>