[ECOS] Re: cyg_alarm - which context
Thu Mar 11 15:10:00 GMT 2010
On 2010-03-11, Martin Laabs <email@example.com> wrote:
> Hello John,
> John Dallaway wrote:
>> Alarm handler functions are called in the context of the code which
>> increments the associated counter. In the case of alarms associated with
>> the eCos system clock, the context is the system clock DSR.
> Thank you for this information. Maybe you could add this in the handbook
> in the chapter about alarms.
Last time I looked, it was already there there:
The alarm function is invoked when a counter tick occurs, in other
words when there is a call to cyg_counter_tick, and will happen in
the same context. If the alarm is associated with the system's
real-time clock then this will be DSR context, following a clock
interrupt. If the alarm is associated with some other
application-specific counter then the details will depend on how
that counter is updated.
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