0.9.3.66:

0.9.3.66:
  * handle failed rt signal generation due to full kernel queue, this
    makes INTERRUPT-THREAD and gc_{stop,start}_the_world less deadlock
    prone
  * reduced lock contention related to INTERRUPT-THREAD with a
    beneficial effect on mass extinction of threads by TERMINATE-SESSION:
    in extreme cases it could have taken minutes to shut down a hundred
    threads
  * reduce delay in thread tests to make it run faster and perhaps more
    likely to trigger problems
  * stable on my machine when compiled with gcc4