kib dd4da0248c Document atomicity for read(2) and write(2).
Take part of the text from POSIX 2018 edition and describe the
atomicity requirements for read and write syscalls.  See p1003.1-2018,
Vol.2, 2.9.7 Threads interaction with Regular File Operations.

Reviewed by:	asomers
Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
Differential revision:	https://reviews.freebsd.org/D20867
2019-07-06 20:31:37 +00:00
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