Re: Re: fork and print..

hmmmm.... curiouser and curiouser...

I just did the same thing as jepri and it still DIDNT work!!????

This suggests to me that something about my installation is broken - I am running Perl version 5.004_04 built for sun4-solaris on SunOS 5.6 - Does anyone know what could cause a problem like this with this config?

just in case here is the exact code I ran and the results:

open(MFOUT,">mfout.txt");
while (<STDIN>)
{
 print MFOUT $_;
 print  $_;

}
my @commands = ("ls","ls *","cat a","cat x");
my %running = ();
my $max_jobs = 200;
my $job_count = 0;

while ( @commands || %running )
{
  if ( @commands && ($job_count < $max_jobs))
  {
    my $command = shift(@commands);
    my $pid;
    if ($pid = fork)
    {
         print "Parent Pid $$\n";
         $running{$pid} = $command;
         ++$job_count;
    }
    else
    {
         die "cannot fork: $!" unless defined $pid;
         print "Child Pid $$ $command\n";
         my $rc = system $command;
         exit($rc>>8);
    }
  }
  else
  {
   my $child_pid = wait();
   if (! exists $running{$child_pid})
   {
     warn "Reaped unkown process id $child_pid!!";
   }
   elsif ($?)
   {
     my $rc = $? >> 8;
     warn "Process '$child_pid:$running{$child_pid}' errored with retu
++rn code '
$rc'";
   }
   print "command '$running{$child_pid}' completed\n";
   delete $running{$child_pid};
   --$job_count;
  }
}
[download]

when I ran this with input:
line1 line2 line3 line4
I got the same output on STDOUT, but mfout.txt contained:
line1 line2 line3 line4 line1 line2 line3 line4 line1 line2 line3 line4 line1 line2 line3 line4 line1 line2 line3 line4

Comment on Re: Re: fork and print.. Download Code

Replies are listed 'Best First'.
Re: Re: Re: fork and print.. by Kung (Initiate) on May 17, 2001 at 09:34 UTC
woops - forgot to log in - that anonymous monk above is me :)	[reply]
test this by jepri (Parson) on May 17, 2001 at 09:51 UTC
Tell me what happens when you run this: open(MFOUT,">mfout.txt"); my @commands= ( 'echo "Hello1"', 'echo "Hello2"', 'echo "Hello3"', 'echo "Hello4"', 'echo "Hello5"', ); my %running = (); my $max_jobs = 2; my $job_count = 0; while ( @commands \|\| %running ) { if ( @commands && ($job_count < $max_jobs)) { my $command = shift(@commands); my $pid; if ($pid = fork) { print "Parent Pid $$\n"; $running{$pid} = $command; ++$job_count; } else { die "cannot fork: $!" unless defined $pid; print "Child Pid $$ $command\n"; print MFOUT `$command`; my $rc = system $command; exit($rc>>8); } } else { my $child_pid = wait(); if (! exists $running{$child_pid}) { warn "Reaped unkown process id $child_pid!!"; } elsif ($?) { my $rc = $? >> 8; warn "Process '$child_pid:$running{$child_pid}' errored with retu +rn code '$ rc'"; } print "command '$running{$child_pid}' completed\n"; delete $running{$child_pid}; --$job_count; } } print "The end!\n"; print MFOUT "The end!\n"; [download] ____________________ Jeremy I didn't believe in evil until I dated it.	[reply] [d/l]