Perl 5.8 threads and sockets problem

abez abez at abez.ca
Mon Feb 24 00:10:03 CST 2003


Well uncomment these lines, so that you "locking" works.
> 			#if (-f $account->{'UID'}.".acc") {
> 	 		#	next;
>   			#}

I don't know WIN32 too well to guess about the memory but you might want to
print before that exit where $account = undef; exit; Just print you're closing
you might get better information.

Also print debugging info to STDERR if possible it's default unbuffered.

call wait() before you call sleep(1) and it will make sure your processes
aren't zombified.


On Sun, 23 Feb 2003, Jeremy Aiyadurai wrote:

>
> Hi again,
>
> Thanks for all your help so far.
> I monitored my memory usage while running the script.
> It appears to slowly eat up memory. If i were to run this script day and
> night as long as I keep my computer on like a server, It would probably
> crash my system even though I have alot of SDRAM.
> Also, the script will run for a while, then crash and exit, does this have
> to do with fork (thread) races?
> eg. it ends like this
> "
> in Jeremy
> in Jon
> Forking Jeremy
> Forking Jon
> Child Jeremy
> Child Jon
> in Jeremy
> in Jon
> Forking Jeremy
> Child Jeremy
> in Jeremy" - exits here? don't know why? when three jeremy's are in
> sequence, the program terminates.
>
> Your Help is greatly appreciated
>
> Thanks,
> Jeremy A.
>
> here is the script now with the prints "Forking $UID","Child $UID" and "in
> $UID".
> ---------------------------
> use IO::Socket qw(:DEFAULT :crlf);
> use Win32;
>
>
> my @thr = ();
> my @Data = (
> 	 { 'UID' => "Jeremy", 'SVR' => "mail.host.net", 'PORT' => "110",
> 'LOGIN' => "jerdoe", 'PASS' => "********" },
> 	 { 'UID' => "Jon", 'SVR' => "mail.host.net", 'PORT' => "110",
> 'LOGIN' => "jondoe", 'PASS' => "*****" },
> );
> my $i = 0;
>
> Startup();
>
> #foreach my $account (@Data) {
> #	$str = " rm -f $account->{UID}.acc ";
> #	`$str`;
> #}
>
>
> sub Startup {
> 	for (;;) {
>       #Win32::Sleep(4000);
> 		$| = 0;
> 		foreach my $account (@Data) {
> 			#if (-f $account->{'UID'}.".acc") {
> 	 		#	next;
>   			#}
> 			print "Forking $account->{UID}\n";
> 			my $pid = fork();
> 			if ($pid==0) { #child
> 				print "Child $account->{UID}\n";
> 				go($account);
> 				$account = undef;
> 				exit();
> 			}
>
>                 }
>                 sleep(1);
>         }
>   }
>
>
>
>
> sub go() {
> 	my $ac = shift;
>
> my $pop3C = IO::Socket::INET->new(Proto => 'tcp', PeerAddr =>
> 	$ac->{SVR},
> 	PeerPort => $ac->{PORT} , Timeout => 0)
> 	or pop3CError ($ac->{SVR},$ac->{PORT});
> open(X,">".$ac->{UID}.".acc");
> close(X);
> print "in $ac->{UID}\n";
> Win32::Sleep(4000);
> $pop3C->close;
> $ac->{'UID'} = undef;
> $ac->{'SVR'} = undef;
> $ac->{'PORT'} = undef;
> $ac->{'LOGIN'} = undef;
> $ac->{'PASS'} = undef;
> $pop3C = undef;
> unlink($_[1].".acc");
> }
>
> sub pop3CError ($$) {
>
> print "Cannot connect to the the Pop3 server:$_[0], port:$_[1]\n";
> exit;
>
> }
>
>
>
>
> >From: abez <abez at abez.ca>
> >To: Jeremy Aiyadurai <jeremygwa at hotmail.com>
> >CC: victoria-pm at pm.org
> >Subject: Re: Perl 5.8 threads and sockets problem
> >Date: Sun, 23 Feb 2003 20:35:24 -0800 (PST)
> >
> >
> >
> >Here's what I'd do:
> >
> >use IO::Socket qw(:DEFAULT :crlf);
> >
> >my @thr = ();
> >my @Data = (
> >	 { 'UID' => "abez", 'SVR' => "lycos.com", 'PORT' => "80",
> >'LOGIN' => "abez", 'PASS' => "******" },
> >	 { 'UID' => "casper", 'SVR' => "www.metafilter.com", 'PORT' => "80",
> >'LOGIN' => "casper", 'PASS' => "*****" },
> >);
> >my $i = 0;
> >
> >Startup();
> >
> >foreach my $account (@Data) {
> >	$str = " rm -f $account->{UID}.acc ";
> >	`$str`;
> >}
> >
> >$| = 0;
> >sub Startup {
> >	for (;;) {
> >       #Win32::Sleep(4000);
> >		foreach my $account (@Data) {
> >			#if (-f $account->{'UID'}.".acc") {
> >  	 		#	next;
> >   			#}
> >			print "Forking $account->{UID}\n";
> >			my $pid = fork();
> >			if ($pid==0) { #child
> >				print "Child $account->{UID}\n";
> >				go($account);
> >				exit();
> >			}
> >                 }
> >		sleep(10);
> >         }
> >   }
> >
> >
> >
> >
> >sub go($$$$$) {
> >	my $account = shift;
> >
> >my $pop3C = IO::Socket::INET->new(Proto => 'tcp', PeerAddr =>
> >	$account->{SVR},
> >	PeerPort => $account->{PORT} , Timeout => 60)
> >	or pop3CError ($account->{SVR},$account->{PORT});
> >open(X,">".$account->{UID}.".acc");
> >close(X);
> >print "in $account->{UID}\n";
> >print $pop3C "GET /\n";
> >my @out = <$pop3C>;
> >print join("", at out[0..10]),"\n";
> >$pop3C->close;
> >
> >$pop3C = undef;
> >unlink($_[1].".acc");
> >}
> >
> >sub pop3CError ($$) {
> >
> >print "Cannot connect to the the Pop3 server:$_[0], port:$_[1]\n";
> >exit;
> >
> >}
> >
> >
> >
> >On Sun, 23 Feb 2003, Jeremy Aiyadurai wrote:
> >
> > > hi All,
> > >
> > > Thanks for your help so far.
> > >
> > > I tried threads->create, it made no difference,
> > > as mentioned in the manpage, "The new() method is an alias for create().
> >"
> > >
> > > Your Help is much appreciated,
> > > thanks
> > >
> > > Jeremy A.
> > >
> > > >From: abez <abez at abez.ca>
> > > >To: Jeremy Aiyadurai <jeremygwa at hotmail.com>
> > > >CC: victoria-pm at pm.org
> > > >Subject: Re: Perl 5.8 threads and sockets problem
> > > >Date: Sun, 23 Feb 2003 18:38:16 -0800 (PST)
> > > >
> > > >
> > > >First of all try threads->create, rather than new. Other than that I'm
> >too
> > > >dizzy to really help right now (flu).
> > > >
> > > >On Sun, 23 Feb 2003, Jeremy Aiyadurai wrote:
> > > >
> > > > >
> > > > > Hello all,
> > > > >
> > > > > I am new to the group.
> > > > > I have a problem involving sockets and threads.
> > > > >
> > > > > Basically, I want to be able to do two or more pop3 sessions
> > > >simultaniously
> > > > > using a list of different pop3 accounts.
> > > > > my problem is, I can logon to the first account, but when
> > > > > it comes to the second account's turn (in the second thread), the
> >socket
> > > > > cannot be created.
> > > > >
> > > > > I am new to using threads and have little knowledge of sockets.
> > > > >
> > > > > Your Help is much appreciated,
> > > > >
> > > > > Thanks,
> > > > >
> > > > > Jeremy A.
> > > > >
> > > > > Below is my test script I am having trouble with.
> > > > >
> > > > >
> > > > > #-----------------------------------------------------
> > > > > use threads;
> > > > > use Win32;
> > > > > use IO::Socket qw(:DEFAULT :crlf);
> > > > >
> > > > >
> > > > > my @thr;
> > > > > my @Data;
> > > > > $Data[0] = { 'UID' => "Jeremy", 'SVR' => "mail.host.net", 'PORT' =>
> > > >"110",
> > > > > 'LOGIN' => "account1", 'PASS' => "******" };
> > > > > $Data[1] = { 'UID' => "Dave", 'SVR' => "mail.bost.com", 'PORT' =>
> >"110",
> > > > > 'LOGIN' => "account2", 'PASS' => "*****" };
> > > > > my $i = 0;
> > > > >
> > > > > sub Startup {
> > > > >     while (1) {
> > > > >       Win32::Sleep(4000);
> > > > >         foreach my $account (@Data)
> > > > >         {
> > > > >                 if(!open(T,"".$account->{'UID'}.".acc"))
> > > > >                 {
> > > > >   		Win32::Sleep(40);
> > > > >   		if($i != 0)
> > > > >   		{
> > > > >   		 $i = $i + 1;
> > > > >   		}
> > > > >   		$thr[$i] =
> > > > >
> > >
> > >threads->new(\&go,$account->{'UID'},$account->{'SVR'},$account->{'PORT'},$account->{'LOGIN'},$account->{'PASS'});
> > > > > 		$thr[$i]->join;
> > > > >                 }else
> > > > >                 {
> > > > >                         close(T);
> > > > >                 }
> > > > >                 $i = $i - 1;
> > > > >
> > > > >         }
> > > > >   }
> > > > >   @AC = -1;
> > > > > }
> > > > >
> > > > > Startup();
> > > > >
> > > > >
> > > > >
> > > > > sub go($$$$$) {
> > > > > print "$_[0],$_[1],$_[2],$_[3],$_[4],$_[5],$_[6]\n";
> > > > >
> > > > > my $pop3C = IO::Socket::INET->new(Proto => 'tcp', PeerAddr =>
> >"$_[1]",
> > > > > PeerPort => $_[2], Timeout => 60) or pop3CError ($_[1],$_[2]);
> > > > > open(X,">".$_[1].".acc");
> > > > > close(X);
> > > > > print "in $_[1]\n";
> > > > > sleep(1);
> > > > > pop3close($pop3C);
> > > > > $pop3C = undef;
> > > > > unlink($_[1].".acc");
> > > > > }
> > > > >
> > > > >
> > > > > sub pop3CError ($$) {
> > > > >
> > > > > print "Cannot connect to the the Pop3 server:$_[0], port:$_[1]\n";
> > > > > exit;
> > > > >
> > > > > }
> > > > >
> > > > >
> > > > > sub pop3close ($) {
> > > > > 	if ($_[0]) {
> > > > > 	 shutdown ($_[0], 2);
> > > > > 	}
> > > > > }
> > > > > #-----------------------------------------------------
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > _________________________________________________________________
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> > > > >
> > > >
> > > >--
> > > >abez ------------------------------------------
> > > >http://www.abez.ca/ Abram Hindle (abez at abez.ca)
> > > >------------------------------------------ abez
> > >
> > >
> > > _________________________________________________________________
> > > Add photos to your messages with MSN 8. Get 2 months FREE*.
> > > http://join.msn.com/?page=features/featuredemail
> > >
> >
> >--
> >abez ------------------------------------------
> >http://www.abez.ca/ Abram Hindle (abez at abez.ca)
> >------------------------------------------ abez
>
>
> _________________________________________________________________
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-- 
abez ------------------------------------------
http://www.abez.ca/ Abram Hindle (abez at abez.ca)
------------------------------------------ abez



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