[cairo] Locking policy (and new cairo_hash_table interface)

Keith Packard keithp at keithp.com
Wed Jun 29 09:59:39 PDT 2005

On Wed, 2005-06-29 at 07:21 -0700, Carl Worth wrote:

> PS. Here's the new interface from cairo-hash-table-private.h. After
> I'd finished designing this, I checked glib and found I'd reinvented
> an interface almost identical to that of GHashTable. For the sake of
> those who are used to using that code, I've now renamed a couple of
> operations to reinforce that similarity (store->insert,
> iterate->foreach).

The basic API seems fine to me. It does require two passes over the hash
table on a miss (lookup, insert), but that doesn't seem an onerous price
to pay for a simple API.

One thing I don't quite understand -- if the hash table isn't
responsible for ejecting items, why are there 'delete' functions
provided?  Isn't the caller responsible for cleaning up the removed
objects when they call cairo_hash_table_remove?

Do you plan to construct a cache object on top of this simple hash
table? Or would you leave that to per-object code?


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