thunk: deprecate thunk_dispatch_keep()

Enable callees to control lifecycle via return values
in thunk_dispatch() instead.

The thunk_dispatch_keep() function encuraged caller-determined
lifecycles which really doesn't work in practice.

Now if a thunk returns <= 0 it will be freed, negative values are
expected to be used for propagating out fatal errors.  A positive
value (conventionally will just be 1) will bypass the free, which
is expected to be used in thunk reuse situations like iterators.

0 files changed, 0 insertions, 0 deletions