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Diff for /loncom/lonmaxima between versions 1.11 and 1.14

version 1.11, 2006/03/04 15:47:26 version 1.14, 2006/03/08 14:22:14
Line 37  use IO::Socket; Line 37  use IO::Socket;
 use IO::File;  use IO::File;
 use Symbol;  use Symbol;
 use POSIX;  use POSIX;
   use Fcntl;
   use Socket;
 use lib '/home/httpd/lib/perl/';  use lib '/home/httpd/lib/perl/';
 use LONCAPA::Configuration;  use LONCAPA::Configuration;
     
 use strict;  use strict;
   
 # global variables  # global variables
   my $STARTPORT              = 5664;     # port for first child's server
 my $PREFORK                = 5;        # number of children to maintain  my $PREFORK                = 5;        # number of children to maintain
 my $MAX_CLIENTS_PER_CHILD  = 5;        # number of clients each child should process  my $MAX_CLIENTS_PER_CHILD  = 5;        # number of clients each child should process
 my %children               = ();       # keys are current child process IDs  my %children               = ();       # keys are current child process IDs
   my %usedmaximaports        = ();       # keys are the used maximaports
 my $children               = 0;        # current number of children  my $children               = 0;        # current number of children
 my $status;                            # string for current status  my $status;                            # string for current status
 my $pidfile;                           # file containg parent process pid  my $pidfile;                           # file containg parent process pid
 my $port;                              # path to UNIX socket file  my $port;                              # path to UNIX socket file
 my %perlvar;                           # configuration file info  my %perlvar;                           # configuration file info
 my $lastlog;                           # last string that was logged  my $lastlog;                           # last string that was logged
 my $maximapid;                         # PID of Maxima process  use vars qw($PREFORK $MAX_CLIENTS_PER_CHILD %children $children %usedmaximaports $status
 use vars qw($PREFORK $MAX_CLIENTS_PER_CHILD %children $children $status      $pidfile $port %perlvar $lastlog);
     $pidfile $port %perlvar $lastlog $maximapid);  
    
 sub maximareply {  
     my ($cmd) = @_;  
     my $reply='';  
     my $error='';  
     my $exitstatus='';  
   
     unless ($cmd=~/\;\n$/) { $cmd.=";\n"; }  
   
     my ($cmd_in, $cmd_out, $cmd_err);  
     $maximapid = open3($cmd_in, $cmd_out, $cmd_err, 'maxima');  
     $children{$maximapid} = 1;  
       
     print $cmd_in $cmd;  
     close($cmd_in);  
   
     &status("Command sent");  
   
     $SIG{ALRM} = sub { kill(9 => $maximapid); };   
     alarm(5);  
   
     my $selector = IO::Select->new();  
   
     $selector->add($cmd_err, $cmd_out);  
       
     while (my @ready = $selector->can_read()) {  
  foreach my $fh (@ready) {  
     if (ref($fh)   
  && ref($cmd_err)  
  && fileno($fh) == fileno($cmd_err)) {  
  $error.=<$cmd_err>;  
     } else {  
  my $line = scalar(<$cmd_out>);  
                 if ($line=~/^(\(\%o|\s)/) {  
     $line=~s/^\(.*\)/     /;   
     $reply.=$line;   
  }  
     }  
     $selector->remove($fh) if eof($fh);  
  }  
     }  
     alarm(0);  
     $SIG{ALRM} = 'DEFAULT';  
     if (ref($cmd_out)) { close($cmd_out); }  
     if (ref($cmd_err)) { close($cmd_err); }  
   
     &status("Command processed");  
     return ($reply,$error,$exitstatus);  
 }  
     
 # ------------------------------------------------------------ Service routines   # ------------------------------------------------------------ Service routines 
 sub REAPER {                        # takes care of dead children   sub REAPER {                        # takes care of dead children 
Line 111  sub REAPER {                        # ta Line 65  sub REAPER {                        # ta
     $SIG{CHLD} = \&REAPER;      $SIG{CHLD} = \&REAPER;
     my $pid = wait;      my $pid = wait;
     $children--;      $children--;
       &logthis("Child $pid for port or process $children{$pid} died");
       delete($usedmaximaports{$children{$pid}});
     delete($children{$pid});      delete($children{$pid});
 }  }
     
Line 175  sub catchexception { Line 131  sub catchexception {
     die("Signal abend");      die("Signal abend");
 }  }
   
   # -------------------------------------------------- make a socket non-blocking
   sub nonblock {
       my $socket = shift;
       my $flags;
       if (ref($socket)) { 
          $flags = fcntl($socket, F_GETFL, 0)
               or die "Can't get flags for socket: $!\n";
          fcntl($socket, F_SETFL, $flags | O_NONBLOCK)
               or die "Can't make socket nonblocking: $!\n";
       }
   }
   
 # ---------------------------------------------------------------- Main program  # ---------------------------------------------------------------- Main program
 # -------------------------------- Set signal handlers to record abnormal exits  # -------------------------------- Set signal handlers to record abnormal exits
Line 252  close(PIDSAVE); Line 218  close(PIDSAVE);
 # Install signal handlers.  # Install signal handlers.
 $SIG{CHLD} = \&REAPER;  $SIG{CHLD} = \&REAPER;
 $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;  $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
    
   my $maximaport=$STARTPORT; 
 # Fork off our children.  # Fork off our children.
 for (1 .. $PREFORK) {  for (1 .. $PREFORK) {
     &make_new_child($server);      &make_new_child($server,$maximaport);
       $maximaport++;
 }  }
     
 # And maintain the population.  # And maintain the population.
Line 264  while (1) { Line 232  while (1) {
     sleep;                          # wait for a signal (i.e., child's death)      sleep;                          # wait for a signal (i.e., child's death)
     for (my $i = $children; $i < $PREFORK; $i++) {      for (my $i = $children; $i < $PREFORK; $i++) {
         &status('Parent process, starting child');          &status('Parent process, starting child');
         &make_new_child($server);           # top up the child pool          my $newport;
           &logthis("Current pool: ".join(', ',keys %usedmaximaports));
           foreach my $testport ($STARTPORT .. $STARTPORT+$PREFORK-1) {
               if (!$usedmaximaports{$testport}) { $newport=$testport; }
           }
           if ($newport) {
              &make_new_child($server,$newport);           # top up the child pool
           }
     }      }
 }  }
                                                                                                                                                                   
 sub make_new_child {  sub make_new_child {
     my ($server) = @_;      my ($server,$maximaport) = @_;
   
     # block signal for fork      # block signal for fork
     my $sigset = POSIX::SigSet->new(SIGINT);      my $sigset = POSIX::SigSet->new(SIGINT);
Line 282  sub make_new_child { Line 257  sub make_new_child {
         # Parent records the child's birth and returns.          # Parent records the child's birth and returns.
         sigprocmask(SIG_UNBLOCK, $sigset)          sigprocmask(SIG_UNBLOCK, $sigset)
             or die("Can't unblock SIGINT for fork: $!\n");              or die("Can't unblock SIGINT for fork: $!\n");
         $children{$pid} = 1;          $children{$pid} = $maximaport;
         $children++;          $children++;
           $usedmaximaports{$maximaport}=1;
         return;          return;
     } else {      } else {
           &logthis("Starting child on port $maximaport");
         # Child can *not* return from this subroutine.          # Child can *not* return from this subroutine.
         $SIG{INT} = 'DEFAULT';      # make SIGINT kill us as it did before          $SIG{INT} = 'DEFAULT';      # make SIGINT kill us as it did before
             
         # unblock signals          # unblock signals
         sigprocmask(SIG_UNBLOCK, $sigset)          sigprocmask(SIG_UNBLOCK, $sigset)
             or die("Can't unblock SIGINT for fork: $!\n");              or die("Can't unblock SIGINT for fork: $!\n");
           
  &process_requests($server);          # open the MAXIMA port
           my $maximaserver = IO::Socket::INET->new(LocalPort => $maximaport,
                                                 Type      => SOCK_STREAM,
                                                 Proto     => 'tcp',
                                                 Reuse     => 1,
                                                 Listen    => 10 )
                           or die "making socket: $@\n";
           &nonblock($maximaserver);
           my $maximaselect=IO::Select->new($maximaserver);
           sleep(2);
   
           # open MAXIMA to talk to that port
           my ($cmd_in, $cmd_out, $cmd_err);
           my $maximapid = open3($cmd_in, $cmd_out, $cmd_err, "maxima -s $maximaport");
           $children{$maximapid} = "Maxima $maximapid port $maximaport";
           my $prompt=<$cmd_out>;
           &logthis("Maxima $maximapid: $prompt");
   
           # hopefully, MAXIMA calls us back
           &status("Waiting $maximapid on $maximaport");
           my $maximaclient=$maximaserver->accept();
           $maximaselect->add($maximaclient);
           &nonblock($maximaclient);
           &status("$maximapid on $maximaport connected.");
           &logthis("Maxima $maximapid on port $maximaport connected.");
           &logthis('Initial reply: '.&maximareply($maximaselect));
           # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
           for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
               &status('Accepting connections for '.$maximapid.' on '.$maximaport);
               my $client = $server->accept()     or last;
               while (my $cmd=<$client>) {
                   &status('Processing command by '.$maximapid.' on '.$maximaport);
                   print $maximaclient &unescape($cmd).";\n";
                   print $client &escape(&maximareply($maximaselect))."\n";
               }
           }
   
         # tidy up gracefully and finish          # tidy up gracefully and finish
   
           if (ref($cmd_out)) { close($cmd_out); }
           if (ref($cmd_err)) { close($cmd_err); }
           if (ref($cmd_in)) { close($cmd_in); }
   
         # this exit is VERY important, otherwise the child will become          # this exit is VERY important, otherwise the child will become
         # a producer of more and more children, forking yourself into          # a producer of more and more children, forking yourself into
         # process death.          # process death.
Line 304  sub make_new_child { Line 320  sub make_new_child {
     }      }
 }  }
   
 sub process_requests {  sub maximareply {
     my ($server) = @_;     my ($maximaselect)=@_;
     # handle connections until we've reached $MAX_CLIENTS_PER_CHILD     my $output='';
     for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {     foreach my $ready ($maximaselect->can_read(1)) {
  &status('Accepting connections');              my $data = '';
  my $client = $server->accept()     or last;         my $rv   = $ready->recv($data, POSIX::BUFSIZ, 0);
  while (my $cmd=<$client>) {         $output.=$data;
     &status('Processing command');     }
     print $client &escape((&maximareply(&unescape($cmd)))[0])."\n";     return $output;
  }  
     }      
 }  }
   
Removed from v.1.11  
changed lines
  Added in v.1.14

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