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From: Chris Faylor <cgf AT cygnus DOT com>
Date: Thu, 12 Aug 1999 17:28:37 -0400
To: chikayama AT klic DOT org
Cc: cygwin AT sourceware DOT cygnus DOT com
Subject: Re: B20.1: Setitimer provides virtual timer?
Message-ID: <19990812172837.A9981@cygnus.com>
Reply-To: cygwin AT sourceware DOT cygnus DOT com
References: <19990812112810X DOT chik AT klic DOT org>
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In-Reply-To: <19990812112810X.chik@klic.org>; from chikayama@klic.org on Thu, Aug 12, 1999 at 11:28:10AM +0900

It's not implemented in Cygwin currently.  Actually, I don't know
of any way to implement it, period.

-chris

On Thu, Aug 12, 1999 at 11:28:10AM +0900, chikayama AT klic DOT org wrote:
>"setitimer(ITIMER_VIRTUAL, ...)" does not seem to deliver SIGVTALRM
>signals.  The test program included below, that sets the process timer
>and loops awaiting for timer expiration, will loop forever.  However,
>running this in background and sending the signal by "kill -VTALRM ..."
>from the shell will terminate it as expected (with an exclamation mark 
>output).
>
>Is this the spec. of the current release or a bug?
>
># I really enjoy using Cygwin.  Thank you for your efforts!
>
>-- Takashi Chikayama AT Dept. of Frontier Informatics., the Univ. of Tokyo
>-- Tel. +81-3-5841-6658; Fax. +81-3-5841-8572
>-- E-mail chikayama AT klic DOT org; Home page http://www.logos.t.u-tokyo.ac.jp
>
>#include <sys/time.h>
>#include <unistd.h>
>#include <stdio.h>
>#include <stdlib.h>
>#include <signal.h>
>
>volatile int time_has_come;
>
>void handler(int signal)
>{
>  time_has_come = 1;
>  fprintf(stderr, "!\n");
>  return;
>}
>
>struct itimerval interval;
>
>int main(int argc, char * const argv[])
>{
>  interval.it_interval.tv_sec = 0;
>  interval.it_interval.tv_usec = 0;
>  interval.it_value.tv_sec = 1;
>  interval.it_value.tv_usec = 0;
>  signal(SIGVTALRM, handler);
>  (void) setitimer(ITIMER_VIRTUAL, &interval, NULL);
>  time_has_come = 0;
>  while (1) {
>    if (time_has_come) {
>      exit(0);
>    }
>  }
>}
>

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