debianistas tend to know where to look, so i'm hoping someone
will point the way--
i know i've run across it before but when i WANT to stub my toe
on it, it's nowhere to be found: HOW can i have apache/web page
initiate a process and return quickly to generate a 'processing,
hold on' page while the process does its processing?
i've got a web page that i launch after ftp-ing a bunch of
images up to a website. it starts some Image::Magick filters and
takes a Bloody Good Long Time to complete. i've got mod_perl
calling the script as an external command (slow, but it keeps
the ::Magick libraries from sucking up over a meg of apache
memory) and it forks like this:
#!/usr/bin/perl
[snip]
local $| = 1;
##########################################
# fork & return so web page doesn't wait # N O T
##########################################
my $pid = fork();
if ( defined( $pid ) ) {
if ( $pid ) {
# parent
my $v = "PROCESSING: $pid\n" . join
"\n",$DOCROOT,$holding,@SZ;
print $v;
exit 0;
}
#child
# fork again, have grandkid do the work so grampa can finish
$pid = fork();
exit if ( $pid ); # original child
# now we're grandkid
} else {
die "Unable to fork at all";
}
##########################################
use Image::Magick;
[snip]
i remember hearing that parent processes tend to wait on their
kids, so i even tried forking twice so that the grandkid could
traipse off and do the work. (seems flawed in theory and
practice, of course.)
alas, even with this setup, apache still waits on the whole
shebang to finish before sending any html...
pointers? flames? any gdM you think i should RTF out of?
--
DEBIAN NEWBIE TIP #38 from Alvin Oga <[EMAIL PROTECTED]>
:
Curious about your NETWORK TRAFFIC? There's a whole bunch of
ways to monitor it: iptraf, showtraf, netwatch, tcpview, statnet,
or even
tcpdump | grep 'what you want to see'
lsof -i | grep 'LISTEN'
For network statistics try "mrtg". See the ethernet section
over at http://www.Linux-Sec.net/
Also see http://newbieDoc.sourceForge.net/ ...
