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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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LEARN ABOUT CENTOS

struct_hrtimer

STRUCT 
HRTIMER(9)						   Driver Basics						 STRUCT HRTIMER(9)

NAME

       struct_hrtimer - the basic hrtimer structure

SYNOPSIS

       struct hrtimer {
	 struct timerqueue_node node;
	 ktime_t _softexpires;
	 enum hrtimer_restart	     (* function) (struct hrtimer *);
	 struct hrtimer_clock_base * base;
	 unsigned long state;
       #ifdef CONFIG_TIMER_STATS
	 int start_pid;
	 void * start_site;
	 char start_comm[16];
       #endif
       };

MEMBERS

       node
	   timerqueue node, which also manages node.expires, the absolute expiry time in the hrtimers internal representation. The time is related
	   to the clock on which the timer is based. Is setup by adding slack to the _softexpires value. For non range timers identical to
	   _softexpires.

       _softexpires
	   the absolute earliest expiry time of the hrtimer. The time which was given as expiry time when the timer was armed.

       function
	   timer expiry callback function

       base
	   pointer to the timer base (per cpu and per clock)

       state
	   state information (See bit values above)

       start_pid
	   timer statistics field to store the pid of the task which started the timer

       start_site
	   timer statistics field to store the site where the timer was started

       start_comm[16]
	   timer statistics field to store the name of the process which started the timer

DESCRIPTION

       The hrtimer structure must be initialized by hrtimer_init

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014							 STRUCT HRTIMER(9)