Re: generate random number without using any built in function in perl?

#! perl -slw
use strict;
use Data::Dump qw[ pp ];
use threads;
use threads::shared;

my $rand :shared = chr(0)x4;

async( sub {
    use bytes;
    my $tid = shift;
    --vec( $rand,$tid,8) while 1;
}, $_ )->detach for 0 .. 3;

our $M //= 24;
our $N //= 1e4;

my %stats;
++$stats{ unpack( 'V', $rand ) % $M } for 1 .. $N;

pp \%stats;

__END__
C:\test>rand
{
  "0" => 499,
  1   => 380,
  2   => 296,
  3   => 450,
  4   => 373,
  5   => 395,
  6   => 465,
  7   => 445,
  8   => 423,
  9   => 465,
  10  => 446,
  11  => 515,
  12  => 433,
  13  => 424,
  14  => 441,
  15  => 423,
  16  => 364,
  17  => 308,
  18  => 403,
  19  => 373,
  20  => 516,
  21  => 368,
  22  => 352,
  23  => 443,
}
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