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Dir : ~/usr/share/doc/libipc-shareable-perl/examples/

Edit File: hvtest2

#!/usr/bin/perl -w
#
# Test of shared hashes courtesy Robert Emmery <roberte@netscape.com>
use IPC::Shareable;
use Data::Dumper;

use strict;

my %shareOpts = (
                create =>       'yes',
                exclusive =>    'no',
                mode =>         0644,
                destroy =>      'yes',
                );

my %childShareOpts = (
                create =>       'no',
                exclusive =>    'no',
                mode =>         0644,
                destroy =>      'yes'
                );

$SIG{'INT'} = sub { die; };

# create shared memory segment

my %hashTable = ();

print "\n\nPress any key to start.. (Press Ctrl+C to exit)\n\n";
<STDIN>;

tie(%hashTable, 'IPC::Shareable', "glue",  {%shareOpts }) || die "Failed to share hashTable";

if (fork() == 0) {
  # we're in process 1 
  # tie to hashTable...
  tie(%hashTable, 'IPC::Shareable', "glue",  {%childShareOpts} ) || die "Failed to tie from process 1";
  my $count = 0;
  while (1) {
    (tied %hashTable)->shlock();
      $hashTable{$count++ . " - proc 1"} = "proc 1"; 
      print "proc 1: " . Dumper(\%hashTable); 
    (tied %hashTable)->shunlock(); 
    sleep(2);
  }
}
if (fork() == 0) {
  # we're in proces 2
  # tie to hashTable...
  tie(%hashTable, 'IPC::Shareable', "glue",  {%childShareOpts} ) || die "Failed to tie from process 2";
  my $count = 0;
  while (1) {
    (tied %hashTable)->shlock();
      $hashTable{$count++ . " - proc 2"} = "proc 2";
      print "proc 2: " . Dumper(\%hashTable);
    (tied %hashTable)->shunlock();
    sleep(2);
  }
}

# do not exit as shared memory will get lost
while (1) {
  sleep(9999);
}