in reply to Kill a perl script execution in windows

You can use named events. They are kernel events so they persist across processes. You create the event in the first script and when the latter script loads you check for the event's existance. If it already exists then you know that there is another instance already loaded. Check Win32::Event 
$event = Win32::Event->new([$manual, [$initial, [$name]]])
Constructor for a new event object. If $manual is true, you must manua
+lly reset the event after it is signalled (the default is false). If 
+$initial is true, the initial state of the object is signalled (defau
+lt false). If $name is omitted or undef, creates an unnamed event obj
+ect.

If $name signifies an existing event object, then $manual and $initial
+ are ignored and the object is opened. If this happens, $^E will be s
+et to 183 (ERROR_ALREADY_EXISTS).

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Re^2: Kill a perl script execution in windows
by BrowserUk (Patriarch) on Feb 18, 2013 at 13:44 UTC

    That's good for preventing a second copy from starting; but not so useful for killing the previous version if it is running because it doesn't give you the pid.

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[reply]
      you don't need the PID. The first script waits for a signal to terminate as: 
      use Win32::Event;
use 5.010;

$event = Win32::Event->new(1,0,"myevent");
        
while  ($event->wait(0)==0) {
  say $i;
  print $i++;
}

say "exiting";

      [download]
      or just $event->wait(), depends on the situation.Then the second one can signal it to abort : 
      use Win32::Event;
use 5.010;

$event = Win32::Event->new(1,0,"myevent");
say $^E;
$event->set;

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