Subject: Re: Redoing file system suspension API (update)
To: Jason Thorpe <>
From: Juergen Hannken-Illjes <>
List: tech-kern
Date: 06/29/2006 18:54:09
On Thu, Jun 29, 2006 at 09:19:47AM -0700, Jason Thorpe wrote:
> On Jun 29, 2006, at 9:02 AM, Juergen Hannken-Illjes wrote:
> >Was a suggestion of Bill Studenmund if I remeber right.
> >
> >No problem to put the recursion into the lock.
> which point you can simply use a lockmgr lock instead of  
> rolling your own, and you automatically get the writer-gets-priority  
> behavior, etc.

At least as a base.  Lockmgr locks lack the "do I have a shared lock" query.
I need a lock where a thread already owning a shared lock succeeds when
it wants another shared lock.  Last time I looked lockmg locks had this only
for exclusive locks.

Juergen Hannken-Illjes - - TU Braunschweig (Germany)