Undefined subroutine &main::unlock

Question

I wrote this:

use threads;

    lock($lock);
        cond_wait($full,$lock) while($threads == $max_thread);
        $threads++;
    unlock($lock);

After running this code, I am given the error:

Undefined subroutine &main::unlock called at ./pages.pl line 222, <FH> line 1.`

How can I resolve this?

Answer 1

perlthrtut

Note that there is no unlock() function - the only way to unlock a variable is to allow it to go out of scope.

So,

{
    lock($lock);
    cond_wait($full,$lock) while($threads == $max_thread);
    $threads++;
}