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Submitted by:	brueffer
This commit is contained in:
Edward Tomasz Napierala 2010-02-10 19:03:48 +00:00
parent 619961810c
commit b132183383
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=203762
1 changed files with 5 additions and 4 deletions
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9
share/man/man9/locking.9
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@ -152,7 +152,8 @@ Shared/exclusive locks are similar to reader/writer locks; the main difference
between them is that shared/exclusive locks may be held during unbounded sleep
(and may thus perform an unbounded sleep).
They are inherently less efficient than mutexes, reader/writer locks
and read-mostly locks. They don't support priority propagation.
and read-mostly locks.
They don't support priority propagation.
They should be considered to be closely related to
.Xr sleep 9 .
In fact it could in some cases be
@ -192,9 +193,9 @@ Giant is an instance of a mutex, with some special characteristics:
It is recursive.
.It
Drivers and filesystems can request that Giant be locked around them
by not marking themselves MPSAFE. Note that infrastructure to do this
is slowly going away as non-MPSAFE drivers either became properly locked
or disappear.
by not marking themselves MPSAFE.
Note that infrastructure to do this is slowly going away as non-MPSAFE
drivers either became properly locked or disappear.
.It
Giant must be locked first before other locks.
.It