Re: Wait for background processes to complete

On 2008-01-18 02:02, grocery_stocker <cdalten@xxxxxxxxx> wrote:
On Jan 16, 9:37 pm, Ben Morrow <b...@xxxxxxxxxxxx> wrote:
The only thing that matters about %kids are its keys: we never use
the values, so they can be set to anything. I prefer using 1 since
then the values are all true; you can get slightly better memory use
with

$kids{$pid} = ();

which inserts the key but doesn't create a value for it at all, but
then you have to test with exists, which I find annoying. Since in
this case I don't test for existance of keys at all, this doesn't
matter: using 1 is just a habit.

Okay, why would you have to test for exists if

$kids{$pid} = ();

just creates something like undef.

Consider:

#!/usr/bin/perl
use warnings;
use strict;

my %kids;

$kids{3} = ();
$kids{5} = ();

for (1 .. 9) {
print "$_\n" if is_kid($_);
}

sub is_kid {
return exists($kids{$_[0]});
}
__END__
3
5

Please find an implementation for sub is_kid which doesn't use exists.

hp

.

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