C:> perl -v | head -2 | tail -1
This is perl 5, version 24, subversion 0 (v5.24.0) built for MSWin32-x64-multi-thread
C:> perl -V | egrep "thread.*="
    useithreads=define, usemultiplicity=define
C:> perl -Mthreads -le "print $threads::VERSION;"
2.07
C:> perl -Mthreads -le "async { sleep 100; }         ; exit;"
Perl exited with active threads:
        1 running and unjoined
        0 finished and unjoined
        0 running and detached
C:> perl -Mthreads -le "async { sleep 100; }->detach ; exit;"
C:>