Hello
I have a script that, much like the Little Old Lady who lived in a shoe,
has so many children it's not sure what to do.
Basically, the script does some stuff, then kicks off multiple copies of
an external process that all run in parallel. It then has to wait until
all of them have completed (successfully) then carry on with the next
bit.
What I've cobbled together so far (i.e. swiped of the web then
modified...)
use strict;
use warnings;
# Do some stuff here
for (my $i=1; $i <=$num_processes; $i++)
{
defined(my $pid = fork) or die( "Cannot fork : $!\n");
# Put all the pids into an aray
if ($pid)
{
push @pids, $pid;
} else {
exec "external giggery pokery"
}
}
foreach my $child_pid (@pids)
{
waitpid($child_pid, 0);
unless( 0==$? )
{
die ("Oh No! An external process has failed!!\n");
}
}
# Do the next bit here
It seems to work with a simplified test script, but I', worried I've
done something stupid in there and the whole thing will explode when
exposed to the live environment.
Does this look sensible and/or is there a better way of doing this?
And help/suggestions/criticisms gratefully received.
Cheers
Andy
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