More syscall messaging commits, and some testing code as well.

[Matthew Dillon]

:On Tue, 12 Aug 2003, Matthew Dillon wrote:
:
:>     Hysteresis would definitely be desireable.  The userland scheduler cannot
:>     just stop, though, because that could deadlock the program.   It would
:>     have to revert to polling until the concurrent syscall count drops below
:>     the hysteresis point.
:
:Once the userland scheduler polls and can't execute the current thread
:wouldn't it schedule another thread?  If there arn't any other threads to
:schedule, I guess it would continue to poll.
:
:Eric

    Right.

					-Matt
					Matthew Dillon 
					<dillon at xxxxxxxxxxxxx>