Then -- with the caveat that I don't have a non-Windows system to hand to test this -- make the changes in main before you spawn the thread. Eg:

{ 
    my $running : shared = 0;
    local %ENV = %ENV;
    $ENV{ FOO } = 'BAR';
    async{
        my $pid = open ...;
        $running = 1;
        ...
        kill ...
    }->detach;
    ## Wait until the kid is spawned before exiting the scope.
    sleep 1 until $running;
}
## And repeat till done.

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In reply to Re^3: Get the process id, and output of a process, in a threaded environment by BrowserUk
in thread Get the process id, and output of a process, in a threaded environment by rmahin

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