Mateusz Guzik 0ecce93dca fd: make serialization in fdescfree_fds conditional on hold count
p_fd nullification in fdescfree serializes against new threads transitioning
the count 1 -> 2, meaning that fdescfree_fds observing the count of 1 can
safely assume there is nobody else using the table. Losing the race and
observing > 1 is harmless.

Reviewed by:	markj
Differential Revision:	https://reviews.freebsd.org/D27522
2020-12-10 17:17:22 +00:00
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