Timers in linux

[scienzia]

Hi,

Working in linux, I need to put some timers in a program I am making.
Actually I would like the timers to be independent from one another (as I could do in VisualC++ applications), so I would like to know if there is a better solution than using SIGALRM based functions (alarm, setitimer,...).

Thanks in advance

 

[Diancecht]

sleep?

Cheers,
Dian

 

[scienzia]

Actually I would like to generate a sort of interrupt after a certain amount of time. The way SIGALRM works is fine for me, the problem is that I can set SIGALRM only for one timer.

To use the sleep I should run different threads with:

while(1)
{
      usleep(mytime);
      myfunc();
}

but I'm not so sure usleep is thread-safe, but I don't think soo.

Thanks

 

[sedj]

usleep() sleeps the current thread of execution - so it does not need to be thread-safe.

See :

http://www.opengroup.org/onlinepubs/009695399/functions/usleep.html

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[scienzia]

Thankyou.

I understood that sleep is thread-safe, but I don't get how.
Somewhere I read that sleep may be implemented using SIGALRM.
Can signals be delivered to a specific thread? Aren't signals sent to processes (which may have different threads)?