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How to implement polling for a function using timer in C?

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Top Forums Programming How to implement polling for a function using timer in C?
# 8  
Old 11-19-2007
What sort of message queue, a UNIX fifo?

I recommend that you have a loop which sits reading the fifo and uses SIGALRM to break the read of the fifo. When you get the alarm it should then give you EINTR for the read, you then go and do your every second work in that occurs.

Then, set the alarm again and go back to reading the fifo.

If you are using MQseries then that has timeouts on the MQGET anyway.
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gettimer

gettimer(3C)															      gettimer(3C)

NAME

       gettimer - get value of a per-process timer

SYNOPSIS

DESCRIPTION

       The function returns an structure value to the argument.  The member of the structure represents the amount of time in the current interval
       before the timer expires for the timer specified in or zero if the timer is disabled.  The member has the  value  last  set  by	(see  rel-
       timer(3C)).  The members of are subject to the resolution of the timer (see mktimer(3C)).

       The behavior of this function is undefined if is NULL.

RETURN VALUE

       Upon successful completion, returns zero; otherwise, it returns -1 and sets to indicate the error.

ERRORS

       fails if any of the following conditions are encountered:

	      [EINVAL]	  does not correspond to an ID returned by

	      [EIO]	  An error occurred while accessing the clock device.

FILES

SEE ALSO

       timers(2), timer_gettime(2), mktimer(3C), reltimer(3C), thread_safety(5).

STANDARDS CONFORMANCE

																      gettimer(3C)