Async patch (no. 3)

[Nick Roberts <nickrob@snap.net.nz>]

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This async patch gives the same test results for synchronous and asynchronous
operation.  Ignoring sigstep.exp again, I get:

		=== gdb Summary ===

# of expected passes		10851
# of unexpected failures	44
# of unexpected successes	1
# of expected failures		42
# of unknown successes		3
# of known failures		66
# of untested testcases		5
# of unsupported tests		5

for both modes.  I also get the same result for current mainline GDB in CVS
(although in this case I sometimes get extra fails for schedlock.exp).

Currently it only works for i686-pc-linux-gnu and I've tried to hide it from
other architectures/OSes.  The only visible change should be those made to MI.

If the global maintainers are agreeable, in principle, to it's inclusion after
the next release, I will tidy it up and provide a ChangeLog.  I would
appreciate any clues as to where some things should go e.g waitpid in
event-loop.c to linux-nat.c? (How?)

This patch will make the branch nickrob-async-20060513 defunct.

-- 
Nick                                           http://www.inet.net.nz/~nickrob


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