Login or Register to Ask a Question and Join Our Community


Programming

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

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
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.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Polling file

HI I need some help on this below one Have summuary file coming on daily basis with list of file names and count ,if the summuary file not exist ,pool it for every 5 mins till it arrives .Once arrived remove first and last line from the file and check all the files in respective director all... (12 Replies)
Discussion started by: mohan705
12 Replies

2. Shell Programming and Scripting

Trying to implement count_collatz_step function

Can anyone give me a clue why this code doesn't work as expected? The function count_collatz_step() take one parameter which a number that need to calculate collatz until it reaches 1. The func should return steps it takes. # # Count steps of collatz conjecture takes, until the number reach 1.... (8 Replies)
Discussion started by: Bunchhieng
8 Replies

3. UNIX for Dummies Questions & Answers

Implement the '&&' function in a shell

Hello, I'm currently implementing the && function in a shell using C. For example, if we input cmd1 && cmd2, then cmd2 executes only when cmd1 exits successfully. I'm thinking about: int main() { int i; char **args; while(1) { printf("yongfeng's shell:~$ "); args =... (5 Replies)
Discussion started by: Yongfeng
5 Replies

4. HP-UX

Polling target on Serviceguard

Hi Guys, we are planning to enable polling target on our SG in reference to this link MC/ServiceGuard: Subnet Goes Down when one of the Cluster Node is Down - HP Customer Care (United States - English) since our server is already in production can we apply the changes with ex. "cmapplyconf... (1 Reply)
Discussion started by: batas
1 Replies

5. Programming

Db polling...

Hi! Im trying to make a program that polls a mysqlDB every 5 minutes. the poll checks a scheduletable in the dB and exicutes a function if there was a "go" in the scheduletable, and if it retrives a "no go" from the table it should just wait for another 5 minutes before re polling the DB, ... (1 Reply)
Discussion started by: karlblau
1 Replies

6. Solaris

NTP polling interval

Is it possible to change the ntp poll manually. I notice that ntp poll is changing autimatically. (1 Reply)
Discussion started by: ningy
1 Replies

7. UNIX for Advanced & Expert Users

How to avoid polling???

Hi all, I have a directory where some process is keeping incremental/new log files. I need to code a program which will periodically poll this directory and if it founds a new file arrived then copy that new file to some other specific directory. We are OK with this polling approach. I just... (3 Replies)
Discussion started by: zing_foru
3 Replies

8. Shell Programming and Scripting

Want to implement VLOOKUP (Excel function) in Unix

Dear All, i want to implement vookup function which is there in excel into Unix. Suppose i have 2 files. The files are given below. File1: MSC Cell SDCA Patna-1 12 Bihar Patna-2 45 Ranchi Bhopal-1 85 Raigarh Bhopal-2 ... (8 Replies)
Discussion started by: pravani1
8 Replies

9. AIX

how to implement timer

anyone can help me how to implement the timer on AIX? I tried with 'setitimer' and its related functions, but it does not work correctly,the program exited each time. thanks (2 Replies)
Discussion started by: Frank2004
2 Replies

10. Programming

Help - Polling Script

How do I write a shell script to perform polling just like what happens with Microsoft mail. i.e display an alert box. (1 Reply)
Discussion started by: brianmu
1 Replies
Login or Register to Ask a Question

LEARN ABOUT DEBIAN

sdl_settimer

SDL_SetTimer(3) 						 SDL API Reference						   SDL_SetTimer(3)

NAME

       SDL_SetTimer - Set a callback to run after the specified number of milliseconds has elapsed.

SYNOPSIS

       #include "SDL.h"

       int SDL_SetTimer(Uint32 interval, SDL_TimerCallback callback);

CALLBACK

       /* Function prototype for the timer callback function */ typedef Uint32 (*SDL_TimerCallback)(Uint32 interval);

DESCRIPTION

       Set  a  callback  to run after the specified number of milliseconds has elapsed. The callback function is passed the current timer interval
       and returns the next timer interval. If the returned value is the same as the one passed in, the periodic alarm continues, otherwise a  new
       alarm is scheduled.

       To cancel a currently running timer, call SDL_SetTimer(0, NULL);

       The timer callback function may run in a different thread than your main constant, and so shouldn't call any functions from within itself.

       The  maximum  resolution  of this timer is 10 ms, which means that if you request a 16 ms timer, your callback will run approximately 20 ms
       later on an unloaded system. If you wanted to set a flag signaling a frame update at 30 frames per second (every 33 ms), you  might  set  a
       timer for 30 ms (see example below).

       If you use this function, you need to pass SDL_INIT_TIMER to SDL_Init().

	      Note:

	      This  function  is  kept for compatibility but has been superseded by the new timer functions SDL_AddTimer and SDL_RemoveTimer which
	      support multiple timers.

EXAMPLES

       SDL_SetTimer((33/10)*10, my_callback);

SEE ALSO

       SDL_AddTimer

SDL
							      Tue 11 Sep 2001, 23:01						   SDL_SetTimer(3)