patch applied (ghc): Improvements to shutting down of the runtime

[Simon Marlow]

Wed Mar 15 06:50:41 PST 2006  Simon Marlow <simonmar at microsoft.com>
  * Improvements to shutting down of the runtime
  Yet another attempt at shutdown & interruption.  This one appears to
  work better; ^C is more responsive in multi threaded / SMP, and I
  fixed one case where the runtime wasn't responding to ^C at all.

    M ./ghc/rts/Capability.c -3 +3
    M ./ghc/rts/Schedule.c -52 +122
    M ./ghc/rts/Schedule.h -7 +8
    M ./ghc/rts/Timer.c -30 +30
    M ./ghc/rts/posix/Select.c -2 +3
    M ./ghc/rts/posix/Signals.c -2 +2