d/freebsd-nq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

- Clarify ambiguous statement about not being able to both slock and xlock

Browse Source 
a single lock at the same time.
- Avoid using "own" to refer to holding either a shared or exclusive lock
  as it is only really correct for exclusive locks.
- Reword the sentence about sleep-ability to read easier.

Requested by:	truckman (1)
This commit is contained in:
John Baldwin 2004-02-24 21:36:39 +00:00
parent fc31408d87
commit ab9fe4e1fe
1 changed files with 7 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
share/man/man9/sx.9
View File

@ -105,10 +105,10 @@ or
.Fn sx_try_xlock
and
.Fn sx_xunlock .
A thread can attempt to upgrade a currently owned shared lock to an exclusive
A thread can attempt to upgrade a currently held shared lock to an exclusive
lock by calling
.Fn sx_try_upgrade .
A thread that owns an exclusive lock can downgrade it to a shared lock by
A thread that has an exclusive lock can downgrade it to a shared lock by
calling
.Fn sx_downgrade .
.Pp
@ -172,10 +172,13 @@ but with an additional argument,
that is used in generating unique variable names for the related
structures associated with the lock and the sysinit routine.
.Pp
A thread may not own a shared lock and an exclusive lock simultaneously;
A thread may not hold both a shared lock and an exclusive lock on the same
lock simultaneously;
attempting to do so will result in deadlock.
.Sh CONTEXT
It is allowed to own a shared lock or an exclusive lock while sleeping.
A thread may hold a shared or exclusive lock on an
.Nm
lock while sleeping.
.Sh SEE ALSO
.Xr condvar 9 ,
.Xr mtx_pool 9 ,