Subject: CVS commit: src
To: None <firstname.lastname@example.org>
From: Frank van der Linden <email@example.com>
Date: 02/28/1999 06:09:15
Module Name: src
Committed By: fvdl
Date: Sun Feb 28 14:09:15 UTC 1999
Recursive locks were previously only available with LK_CANRECURSE. This
could be done in one of 2 ways:
* call lk_init with LK_CANRECURSE, resulting in a lock that
always can be used recursively.
* call lockmgr with LK_CANRECURSE, meaning that it's ok if this
lock is already held by us.
Sometimes we need a locking type that says: take this lock now, exclusively,
but while I am holding it, I may go through a code path which could attempt
to get the lock again, and which is unaware that the lock might already
be taken. Implement LK_SETRECURSE for this purpose. Assume that locks and
unlocks come in matching pairs (they should), and check for this 'level'
using SETRECURSE locks.