[PATCH 3/3] server: Use dedicated select op to wait for async object.

[Jacek Caban]

Allows passing request result without accessing iosb.

Signed-off-by: Jacek Caban <jacek(a)codeweavers.com>
---

This is needed to support overlapped device file I/O. Those need to 
block, but possibly return STATUS_PENDING anyway, for which we can't use 
iosb as it's not set yet.

  dlls/ntdll/file.c   | 40 ++++++++++++++--------------------------
  server/async.c      |  5 +++++
  server/file.h       |  1 +
  server/protocol.def |  3 ++-
  server/thread.c     |  4 +++-
  5 files changed, 25 insertions(+), 28 deletions(-)