Re: fs_notify patch

[Roland McGrath]

Oh, I thought you liked the MACH_SEND_NOTIFY plan.  
But this one is fine by me too, if Thomas has no complaints.

Using a zero timeout, a nonresponsive receiver stays on the list and causes
the server a system call for the failed message-send attempt every time
there is a new change.  The MACH_SEND_NOTIFY plan avoids that repeated
overhead but during a period of not keeping up, but imposes more overhead
at the beginning and end of a period of not keeping up.