Re: pin_varobject usage

[Vladimir T. <vtz...@gm...>]

On 7/21/09, Sam Steingold <sd...@gn...> wrote:
> Vladimir Tzankov wrote:
>> 2. handle each case separately (now vector of vectors).
>
> yes, this is the application (rawsock) developer's chore, not the core
> (lispbibl) developer's one.

I've added pin_varobject_with_pc(pc,varobject) macro that pins object
using already allocated pinned_chain_t struct (pc). It should be C
stack allocated - auto or via alloca().
In case of rawsock iovec - I think an array of pinned_chain_t struct
should be alloca()-ed by the caller of fill_iovec() and fill_iovec()
should use pin_varobject_with_pc() for each vector.
After the system call returns (readv/writev) - the new macro
unpin_varobjects(count) can be used to unpin all vectors at once. In
case of non-local exit from the system call (for example CTRL-C while
in it ...) objects will be unpinned in enter_frame_at_STACK() (like it
was before).

Also - STACK is not modified anymore when object is pinned/unpinned.

Vladimir