On Fri, 29 May 2009, Attilio Rao wrote:
Make the rmlock(9) interface a bit more like the rwlock(9) interface:
- Add rm_init_flags() and accept extended options only for that variation.
- Add a flags space specifically for rm_init_flags(), rather than borrowing
the lock_init() flag space.
- Define flag RM_RECURSE to use instead of LO_RECURSABLE.
- Define flag RM_NOWITNESS to allow an rmlock to be exempt from WITNESS
checking; this wasn't possible previously as rm_init() always passed
LO_WITNESS when initializing an rmlock's struct lock.
- Add RM_SYSINIT_FLAGS().
- Rename embedded mutex in rmlocks to make it more obvious what it is.
- Update consumers.
- Update man page.
Thanks!
There's quite a bit more to be done with rmlocks -- among other things, lock
assertion support is quite incomplete, and it needs to integrate with WITNESS
better. I probably don't have time to work on this, but perhaps for someone
with a bit more experience with our locking primitives it would prove straight
forward? :-)
Robert N M Watson
Computer Laboratory
University of Cambridge
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