Changing the while loop to 

use POSIX ":sys_wait_h";
while ( kill(0, $pid) ) {
    my $addr = recv( $socket, my $time, 1024, 0 ) or select '','','',0
+.015;

    printf "\rProgress: %s", $time;
    my $res = waitpid($pid, WNOHANG);
    }

[download]
made the original not hang on 
This is perl 5, version 20, subversion 1 (v5.20.1) built for MSWin32-x
+86-multi-thread-64int
(with 1 registered patch, see perl -V for more detail)

Copyright 1987-2014, Larry Wall

Binary build 2000 [298557] provided by ActiveState http://www.ActiveSt
+ate.com
Built Oct 15 2014 22:10:49

[download]

In reply to Re^3: Shared memory and asynchronous access by huck
in thread Shared memory and asynchronous access by vef445

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