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Diff for /loncom/lond between versions 1.325 and 1.329

version 1.325, 2006/05/11 17:53:22 version 1.329, 2006/05/18 17:55:49
Line 37  use LONCAPA::Configuration; Line 37  use LONCAPA::Configuration;
 use IO::Socket;  use IO::Socket;
 use IO::File;  use IO::File;
 #use Apache::File;  #use Apache::File;
 use Symbol;  
 use POSIX;  use POSIX;
 use Crypt::IDEA;  use Crypt::IDEA;
 use LWP::UserAgent();  use LWP::UserAgent();
Line 54  use LONCAPA::ConfigFileEdit; Line 53  use LONCAPA::ConfigFileEdit;
 use LONCAPA::lonlocal;  use LONCAPA::lonlocal;
 use LONCAPA::lonssl;  use LONCAPA::lonssl;
 use Fcntl qw(:flock);  use Fcntl qw(:flock);
 use Symbol;  
   
 my $DEBUG = 0;       # Non zero to enable debug log entries.  my $DEBUG = 0;       # Non zero to enable debug log entries.
   
Line 1050  sub _do_hash_untie { Line 1048  sub _do_hash_untie {
   
     sub _locking_hash_tie {      sub _locking_hash_tie {
  my ($file_prefix,$namespace,$how,$loghead,$what) = @_;   my ($file_prefix,$namespace,$how,$loghead,$what) = @_;
           my $lock_type=LOCK_SH;
   # Are we reading or writing?
           if ($how eq &GDBM_READER()) {
   # We are reading
              if (!open($sym,"$file_prefix.db.lock")) {
   # We don't have a lock file. This could mean
   # - that there is no such db-file
   # - that it does not have a lock file yet
                  if ((! -e "$file_prefix.db") && (! -e "$file_prefix.db.gz")) {
   # No such file. Forget it.                
                      $! = 2;
                      return undef;
                  }
   # Apparently just no lock file yet. Make one
                  open($sym,">>$file_prefix.db.lock");
              }
   # Do a shared lock
              if (!&flock_sym(LOCK_SH)) { return undef; } 
   # If this is compressed, we will actually need an exclusive lock
      if (-e "$file_prefix.db.gz") {
          if (!&flock_sym(LOCK_EX)) { return undef; }
      }
           } elsif ($how eq &GDBM_WRCREAT()) {
   # We are writing
              open($sym,">>$file_prefix.db.lock");
   # Writing needs exclusive lock
              if (!&flock_sym(LOCK_EX)) { return undef; }
           } else {
              &logthis("Unknown method $how for $file_prefix");
              die();
           }
   # The file is ours!
   # If it is archived, un-archive it now
          if (-e "$file_prefix.db.gz") {
              system("gunzip $file_prefix.db.gz");
      if (-e "$file_prefix.hist.gz") {
          system("gunzip $file_prefix.hist.gz");
      }
          }
   # Change access mode to non-blocking
          $how=$how|&GDBM_NOLOCK();
   # Go ahead and tie the hash
          return &_do_hash_tie($file_prefix,$namespace,$how,$loghead,$what);
       }
   
  my ($lock);      sub flock_sym {
               my ($lock_type)=@_;
  if ($how eq &GDBM_READER()) {  
     $lock=LOCK_SH;  
     $how=$how|&GDBM_NOLOCK();  
     #if the db doesn't exist we can't read from it  
     if (! -e "$file_prefix.db") {  
  $! = 2;  
  return undef;  
     }  
  } elsif ($how eq &GDBM_WRCREAT()) {  
     $lock=LOCK_EX;  
     $how=$how|&GDBM_NOLOCK();  
     if (! -e "$file_prefix.db") {  
  # doesn't exist but we need it to in order to successfully  
                 # lock it so bring it into existance  
  open(TOUCH,">>$file_prefix.db");  
  close(TOUCH);  
     }  
  } else {  
     &logthis("Unknown method $how for $file_prefix");  
     die();  
  }  
       
  $sym=&Symbol::gensym();  
  open($sym,"$file_prefix.db");  
  my $failed=0;   my $failed=0;
  eval {   eval {
     local $SIG{__DIE__}='DEFAULT';      local $SIG{__DIE__}='DEFAULT';
     local $SIG{ALRM}=sub {       local $SIG{ALRM}=sub {
  $failed=1;   $failed=1;
  die("failed lock");   die("failed lock");
     };      };
     alarm($lond_max_wait_time);      alarm($lond_max_wait_time);
     flock($sym,$lock);      flock($sym,$lock_type);
     alarm(0);      alarm(0);
  };   };
  if ($failed) {   if ($failed) {
     $! = 100; # throwing error # 100      $! = 100; # throwing error # 100
     return undef;      return undef;
    } else {
       return 1;
  }   }
  return &_do_hash_tie($file_prefix,$namespace,$how,$loghead,$what);  
     }      }
   
     sub _locking_hash_untie {      sub _locking_hash_untie {
Line 6633  to the client, and the connection is clo Line 6652  to the client, and the connection is clo
 IO::Socket  IO::Socket
 IO::File  IO::File
 Apache::File  Apache::File
 Symbol  
 POSIX  POSIX
 Crypt::IDEA  Crypt::IDEA
 LWP::UserAgent()  LWP::UserAgent()
Removed from v.1.325  
changed lines
  Added in v.1.329

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