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Date:      Thu, 19 Mar 2015 07:33:06 +0100
From:      Ivan Radovanovic <radovanovic@gmail.com>
To:        freebsd-hackers@FreeBSD.org
Subject:   kevent behavior
Message-ID:  <550A6DA2.1070004@gmail.com>
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Hi guys,

Is there defined (and guaranteed) behavior of kevent if kqueue FD is 
being closed while blocking kevent call is in progress?

Possible scenario would be like this:

Thread 1:
...
kfd = kqueue();
...
// create second thread afterwords
// and do blocking wait for events
result = kevent(kfd, changelist, nchanges, eventlist, nevents, NULL);
if (result == -1)
	// check if there was request to stop listening for events


Thread 2:
// do something
// then close kqueue's fd
close(kfd);


I am asking this because file watcher implementation for mono is 
implemented that way (which I find nicer than using timeout), but this 
is apparently based on expected kevent behavior under Darwin, and I 
can't find any mention that in FreeBSD kevent is going to behave the 
same way (at least not on kqueue(2) manual page)

Kind regards,
Ivan
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