#! perl -slw
use strict;
use threads stack_size => 4096;
use threads::shared;

open STDOUT, '>', 'nul' or die;

my $shared1 :shared = 1;
my $shared2 :shared = 2;
my $shared3 :shared = 3;
my @counts :shared = (0)x3;

sub FUD1 {
## According to ikegami
## $shared = "abc"; # Can cause scalar type conversion
## leading to [867132|a segfault]
    while( 1 ) {
        my $chance = rand;
        $shared1 =
            $chance < 0.333333333 ? "fred$chance" :
            $chance < 0.666666666 ? $chance :
            int( $chance * 100 );
        lock @counts;
        ++$counts[0];
    }
}

sub FUD2 {
## According to ikegami
## [867127|my $ref = \$shared;  # Increments ref count]
## leading to [867132|premature deallocation]
    while( 1 ) {
        {
            my $ref = \$shared2;
        }
        die unless defined $shared2;
        lock @counts;
        ++$counts[1];
    }
}

sub FUD3 {
## According to ikegami
## [867127|print "$shared\n";   # Implicit type conversion]
## leading to [867132|a segfault]
    while( 1 ) {
        print "$shared3";
        ++$shared3;
        lock @counts;
        ++$counts[2];
    }
}

async( \&FUD1 )->detach for 1 .. 100;
async( \&FUD2 )->detach for 1 .. 100;
async( \&FUD3 )->detach for 1 .. 100;

printf STDERR "\r@counts" while sleep 1;

__END__
C:\test>ikeFUD1.pl
108788021 167537823 101758175
Terminating on signal SIGINT(2)