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

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# 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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iv_timer(3)						    ivykis programmer's manual						       iv_timer(3)

iv_timer_register, iv_timer_unregister, iv_timer_registered - deal with ivykis timers SYNOPSIS
#include <iv.h> struct iv_timer { struct timespec expires; void *cookie; void (*handler)(void *); }; void IV_TIMER_INIT(struct iv_timer *timer); void iv_timer_register(struct iv_timer *timer); void iv_timer_unregister(struct iv_timer *timer); int iv_timer_registered(struct iv_timer *timer); DESCRIPTION
The functions iv_timer_register and iv_timer_unregister register, respectively unregister, a timer with the current thread's ivykis event loop. iv_timer_registered on a timer returns true if that timer is currently registered with ivykis. When a timer that is registered becomes 'ready', due to the current system clock value becoming greater than or equal to the timer's ->expires member field, the callback function specified by ->handler is called in the thread that the timer was registered in, with ->cookie as its first and sole argument. When this happens, the timer is transparently unregistered. The application is allowed to change the ->cookie and ->handler members at any time. The application is not allowed to change the ->expires member while the timer is registered. A given struct iv_timer can only be registered in one thread at a time, and a timer can only be unregistered in the thread that it was reg- istered from. There is no limit on the number of timers registered at once. See iv_examples(3) for programming examples. SEE ALSO
ivykis(3), iv_examples(3) ivykis 2010-08-15 iv_timer(3)