Jilles Tjoelker 2740b654c6 fcntl(2): Document interrupt/restart for file locks.
Since r302216, thread suspension causes advisory file locks to restart
(instead of continuing to wait) and for a long time SA_RESTART has
affected advisory file locks. These are both not compliant to POSIX.1.

To clarify that restarting means something, add a paragraph about fair
queuing. Note that the network lock manager does not implement fair
queuing.

Reviewed by:	kib (previous version)
Approved by:	re (gjb)
2016-07-07 21:44:59 +00:00
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