William T wrote:
There are all kinds of problems that you'll encounter and have to solve
if you fork. I found it's better to call at(1) to start another
seperate process immediatly. If you need to pass data JSON worked
really well for me.
Thanks, that's what I ended up doing. First I ended up having to move
the processing into an external script call anyway, and then I tried
Apache2::SubProcess, and it ended up working, but my script was randomly
receiving TERM signals... it's handleable of course, but I decided to go
with the 'at' technique, it's safer that way, I suppose.
On Aug 25, 2009 5:12 AM, "Victor Danilchenko" <vic...@askonline.net
<mailto:vic...@askonline.net>> wrote:
Hi all,
I need to be able to fork an Apache process in daemon form, to
do some housekeeping which might potentially take a few seconds.
However, when I do that, I start getting SQL errors (of the
"connection lost" type) in the browser. I do the fairly standard
cleanup to daemonize the child process, but of course it needs to
retain the SQL socket open. Here is my forking code:
sub modperl_kamikaze_fork () {
# You will have to do CORE::exit(0) at the end of the execution.
$SIG{CHLD} = 'IGNORE';
get_m->flush_buffer;
defined (my $kid = fork) or die "Cannot fork: $!\n";
return $kid if $kid;
my $r = get_r;
close STDIN; open STDIN, '/dev/null'
or die "Can't read /dev/null: $!";
close STDOUT; open STDOUT, '>/dev/null'
or die "Can't write to /dev/null: $!";
close STDERR; open STDERR, '>>/tmp/form.log'
or die "Cannot open /tmp/fork.log\n";
setsid
or die "Can't start a new session: $!";
my $oldfh = select STDERR;
local $| = 1;
select $oldfh;
warn "Child (PID $$) spawned.\n";
$r->child_terminate;
}
The Apache2:Subprocess doesn't help me, because I need not to
spawn an external process, but to finish processing in mod_perl
context -- just without bugging the user with it.
Any ideas on how to either fork better, or how to solve this
without forking (e.g. is there a way to 'append' a function call to
the request after the rest of the request is completed)?
Many thanks in advance.
--
Victor Danilchenko
Senior Software Engineer, AskOnline.net
vic...@askonline.net <mailto:vic...@askonline.net> - 617-273-0119
--
Victor Danilchenko
Senior Software Engineer, AskOnline.net
vic...@askonline.net - 617-273-0119
