Hi all,

I'm trying to "parallelize" my code using threading. I used 'threads' library for this matter. I'm interesting in changing variables (hash for example) w/o using the same variable in two different threads (i.e without using the threads::shared option).

For example:

my %hash_1 = ();
$hash_1{"michael"} = "michael";
$hash_1{"sasi"} = "other";
$hash_1{"wife"} = 0;

my $thr = threads->create(\&hello,"michael",\%hash_1)->join;
my $thr1 = threads->create(\&hello,"sasi",\%hash_1)->join;

print " ".$hash_1{"wife"}."\n"; # will print '0' although it was manip
+ulated in sub routine 'hello'

sub hello{
    my ($who,$hash) = @_;
    print  "hello from thread: $who ".$hash->{$who}."\n";

    if(defined($hash->{"wife"}) && !$hash->{"wife"}){
        $hash->{"wife"} = "Deena";
        print " ".$hash->{"wife"}."\n";
    }
}

[download]

I was hoping that since I'm passing reference to hash (i.e. address) the 'hello' function will act as usual and will change the hash outside the function scope. I also tried passing parameters like this:

my $thr1 = threads->create(\&hello, qw("sasi" \%hash_1))->join;

w/o to much luck, anyone have an idea how to make it work (if possible).

Thanks in advance.

Michael

In reply to changing parameters in a thread by Anonymous Monk

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