On Fri, 2012-05-25 at 13:25 -0700, Kent Overstreet wrote:
> Asynchronous refcounty thingies; they embed a refcount and a work
> struct. Extensive documentation follows in include/linux/closure.h
[]
> diff --git a/include/linux/closure.h b/include/linux/closure.h
[]
> +enum closure_type {
> + TYPE_closure = 0,
I still think these should be
CLOSURE_TYPE_closure
etc.
> +#define __CLOSURE_TYPE(cl, _t)
> \
> + __builtin_types_compatible_p(typeof(cl), struct _t) \
> + ? TYPE_ ## _t : \
CLOSURE_TYPE_##_t
> +#define __closure_type(cl) \
> +( \
> + __CLOSURE_TYPE(cl, closure) \
> + __CLOSURE_TYPE(cl, closure_with_waitlist) \
> + __CLOSURE_TYPE(cl, closure_with_timer) \
> + __CLOSURE_TYPE(cl, closure_with_waitlist_and_timer) \
> + invalid_closure_type() \
> +)
You should still feel dirty about this...
> +#define continue_at(_cl, _fn, _wq, ...)
> \
> +do { \
> + BUG_ON(!(_cl) || object_is_on_stack(_cl)); \
> + closure_set_ip(_cl); \
> + set_closure_fn(_cl, _fn, _wq); \
> + closure_sub(_cl, CLOSURE_RUNNING + 1); \
> + return __VA_ARGS__; \
> +} while (0)
Does this have to be a macro?
> diff --git a/lib/closure.c b/lib/closure.c
[]
> +#define CL_FIELD(type, field) \
> + case TYPE_ ## type: \
> + return &container_of(cl, struct type, cl)->field
> +
> +static struct closure_waitlist *closure_waitlist(struct closure *cl)
> +{
> + switch (cl->type) {
> + CL_FIELD(closure_with_waitlist, wait);
> + CL_FIELD(closure_with_waitlist_and_timer, wait);
> + default:
> + return NULL;
> + }
> +}
Here:
static struct closure_waitlist *closure_waitlist(struct closure *cl)
{
switch (cl->type) {
case CLOSURE_TYPE_closure_with_waitlist:
return &container_of(cl, struct closure_with_waitlist,
cl)->wait;
case CLOSURE_TYPE_closure_with_waitlist_and_timer:
return &container_of(cl, struct
closure_with_waitlist_and_timer, cl)->wait;
}
return NULL;
}
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