opaque "pointer" API, model, best practice ?

[jim.cromie at gmail.com]

hi all,

is there an api / usage model / or best practice
for opaque "handles" ?

Im aware of 1 case:
the handle returned by zs_malloc
I have tried to use it, and have run into locking conflicts
when trying to keep the memory zs_mapped
longer than the duration of a function.
OTOH, if I map and unmap within the function, things work,
but this is unacceptable overhead.

so I figure I should read some good code,
rather than keep hacking at bad code.