Front page | perl.perl5.porters |
Postings from June 2008
On Mon Oct 13 11:06:18 2003, schwern wrote:
> On Mon, Oct 13, 2003 at 09:41:08AM +0100, Doug Sibley wrote:
> > http://www.perl.com/doc/manual/html/pod/perlfunc/sleep.html
> >
> > says "May be interrupted if the process receives a signal such as
> > SIGALRM" (as do the O'Reilly series of perl books) which led me to
> > believe that I could sleep until I sent a SIGALRM at which point the
> > process would continue.
> >
> > You may wish to update either the behavior or comments of the sleep
> > function.
>
> Hmm. It should probably show an example of the usual idiom.
>
> --- pod/perlfunc.pod 2003/10/13 12:11:23 1.1
> +++ pod/perlfunc.pod 2003/10/13 12:12:07
> @@ -4576,10 +4576,18 @@
> =item sleep
>
> Causes the script to sleep for EXPR seconds, or forever if no EXPR.
> +Returns the number of seconds actually slept.
> +
> May be interrupted if the process receives a signal such as C<SIGALRM>.
> -Returns the number of seconds actually slept. You probably cannot
> -mix C<alarm> and C<sleep> calls, because C<sleep> is often implemented
> -using C<alarm>.
> +
> + eval {
> + local $SIG{ALARM} = sub { die "Alarm!\n" };
> + sleep;
> + };
> + die $@ unless $@ eq "Alarm!\n";
> +
> +You probably cannot mix C<alarm> and C<sleep> calls, because C<sleep>
> +is often implemented using C<alarm>.
>
> On some older systems, it may sleep up to a full second less than what
> you requested, depending on how it counts seconds. Most modern systems
>
>
Thanks! I applied your patch as change #34080. Almost five years
later, but it still applied.
Steve Peters