Path: utzoo!attcan!uunet!cme!libes
From: libes@cme.nist.gov (Don Libes)
Newsgroups: comp.unix.wizards
Subject: Re: Setting multiple timers from a single process.
Message-ID: <3412@muffin.cme.nist.gov>
Date: 14 Mar 90 20:43:36 GMT
References: <24200@uhnix1.uh.edu>
Reply-To: libes@cme.nist.gov (Don Libes)
Organization: National Institute of Standards and Technology
Lines: 18

In article <24200@uhnix1.uh.edu> rr@cs.uh.edu writes:
>The subj line says it; I want to set multiple timers from a single
>process. Using alarm() & catching SIGALARM will permit only a single
>timer. I need to set different values for the different timers 
>
>My solution at the moment; [spawn child processes for each timer]

Simulate them by waiting for the shortest one, and keeping track of
the others yourself.  I've done exactly this.  Anyone who wants code
(4.2BSD) can mail me.

Just watch out for things like 1) a timer interrupting your timer
management code, 2) trying to cancel one this is in the process of
going off (or will be by the time you return), 3) getting a new timer
which is shorter than the current one you are waiting for, and 4) the
possibility of several being scheduled for the same time.

Don Libes          libes@cme.nist.gov      ...!uunet!cme-durer!libes