Unit number allocation API

John Baldwin jhb at FreeBSD.org
Thu Sep 30 11:48:07 PDT 2004

On Thursday 30 September 2004 03:06 am, Poul-Henning Kamp wrote:
> I had this one out on arch@ previously.  I'm very interested in informed
> feedback on how we deal with locking for service api's like this.

I would suggest that the caller should ask for a unit before it needs a lock 
and if it finds that it doesn't need the unit after all it can give it back 
in the error handling.  That is, this is similar to malloc'ing a structure up 
front, then grabbing locks and making changes, then after releasing the lock 
free'ing the structure if it turned out we didn't need it.

John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org

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