>The manual explicitly tells that register_global_root should be called 
>before any valid value is stored in it for the first time, like Val_unit. 
>See Rule 4 of Interfacing C with Objective Caml in the manual.

Yes, but you don't store immediately, you call the alloc_tuple:

>  handlers = (value *) malloc(sizeof(value));
>  register_global_root(handlers);
>  *handlers = alloc_tuple(NUM_HANDLERS);

If alloc_tuple has to collect, then the gc will scan *handlers but it is 
uninitialized data.

If you called alloc_tuple above the register and stored it in a CAMLlocal 
variable, then just stuffed *handler immediately with that value after 
register I could see it working, but I don't see how the current code isn't 
a possible error.

Maybe I'm misunderstanding how the GC works or something?

Chris


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