On Friday, April 26, 2002, at 09:40 , Alex Read wrote:
> Hello,
>
> OK, we now have the following;
>
> #!/usr/bin/perl
> use strict;
>
> my $pid = fork;
> if ($pid == 0){
> exec 'sleep 2; echo "hi"' || die "Cannot sleep: $!" ;
> } else {
> print "Content-type: text/html\n\n<html>";
> print "\nhi\n\n</html>\n\n";
> }
>
> So the child process is the only one that sleeps for 2, then prints hi,
> and
> the parent prints Content-type etc., and on the command line thats exactly
> what it does. I get Content-type etc. straight away, the two seconds
> later
> I get hi. But, when I run this as a cgi script my browser hangs for 2
> seconds and then prints hi hi.
three sets of concerns:
p0: the exec there is still attached to 'STDOUT' - hence
STDOUT remains open for 2 seconds - even if the Initial
print to the buffer STDOUT by the parent occured already.
p1: $| = 1; would turn buffering off
{ but I am not sure what the browser would do with getting
the non-html stuff from the child }
p2: having the child need to communicate with the browser
over the same STDOUT - can get messy.... as you are starting
to notice.... and would be time to rethink the design here...
ciao
drieux
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