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lock.9: fix incorrect descriptions of LK_SHARED and LK_DOWNGRADE behavior

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Reviewed by:	attilio
MFC after:	5 days
X-MFC after:	r243900
This commit is contained in:
Andriy Gapon 2012-12-23 12:56:04 +00:00
parent d8f9490c67
commit c858f5cebd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=244627
1 changed files with 5 additions and 2 deletions
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7
share/man/man9/lock.9
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@ -148,7 +148,9 @@ Flags indicating what action is to be taken.
.Bl -tag -width ".Dv LK_CANRECURSE"
.It Dv LK_SHARED
Acquire a shared lock.
If an exclusive lock is currently held, it will be downgraded.
If an exclusive lock is currently held,
.Dv EDEADLK
will be returned.
.It Dv LK_EXCLUSIVE
Acquire an exclusive lock.
If an exclusive lock is already held, and
@ -158,7 +160,8 @@ is not set, the system will
.It Dv LK_DOWNGRADE
Downgrade exclusive lock to a shared lock.
Downgrading a shared lock is not permitted.
If an exclusive lock has been recursed, all references will be downgraded.
If an exclusive lock has been recursed, the system will
.Xr panic 9 .
.It Dv LK_UPGRADE
Upgrade a shared lock to an exclusive lock.
If this call fails, the shared lock is lost.