Konstantin Belousov f7a6f6a2c0 Make semaphore names list mutex non-recursive.
The mutex is used in sem_open() and sem_close(), which cannot
recurse. The atfork handlers cannot collide with the open and close
code.

Reviewed by:	vangyzen
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D10545
2017-04-30 19:37:45 +00:00
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