patch applied (ghc-6.6/ghc): Add support for the IO manager thread on Windows

Fri Dec  1 06:48:23 PST 2006  Simon Marlow <[email protected]>
  * Add support for the IO manager thread on Windows
  Fixes #637.
  The implications of this change are:
    - threadDelay on Windows no longer creates a new OS thread each time,
      instead it communicates with the IO manager thread in the same way as
      on Unix.
    - deadlock detection now works the same way on Windows as on Unix; that
      is the timer interrupt wakes up the IO manager thread, which causes
      the scheduler to check for deadlock.
    - Console events now get sent to the IO manager thread, in the same way as
      signals do on Unix.  This means that console events should behave more
      reliably with -threaded on Windows.
  
  All this applies only with -threaded.  Without -threaded, the old
  ConsoleEvent code is still used.
  
  After some testing, this could be pushed to the 6.6 branch.

    M ./includes/RtsExternal.h -1 +10
    M ./rts/Prelude.h -2
    M ./rts/RtsStartup.c -2 +3
    M ./rts/Schedule.c -9 +3
    A ./rts/ThrIOManager.h
    M ./rts/posix/Signals.h -6
    M ./rts/win32/ConsoleHandler.c -13 +23
    M ./rts/win32/ConsoleHandler.h -3 +12
    A ./rts/win32/ThrIOManager.c