[Caml-list] C callbacks and threading...

[Caml-list] C callbacks and threading...

[Chris Quinn]

Hi list,

The manual says a caml function can be registered and then used from the C runtime. Is this still true if called from a thread not created from within Caml ie. via the Thread module? I have vague recollections of caml's thread system involving some bookkeeping which probably rules this usage out.
Can anyone say?

Thanks,
Chris Q
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Re: [Caml-list] C callbacks and threading...

[Xavier Leroy]

> The manual says a caml function can be registered and then used from
> the C runtime. Is this still true if called from a thread not
> created from within Caml ie. via the Thread module? I have vague
> recollections of caml's thread system involving some bookkeeping
> which probably rules this usage out.

It should work if:
- the Caml code doesn't use threads itself;
- you call it via callback_exn rather than callback (to make sure you
  always get control back from the Caml code);
- you protect the call to callback_exn by a mutex, to make sure that
  no two threads can call into Caml simultaneously.

In all other cases, and especially if the Caml code is multithreaded,
you would probably break something in the Caml runtime system.

- Xavier Leroy
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[Caml-list] Mac and C-code

[Ward Wheeler]

I am trying to port an Ocaml application to Mac PPC and have C-code that is 
linked in.  I can do this under LINUX and Win2k usinf gc and MS VC++.  Does 
anyone have experience with this on Macs?
Thanks
Ward Wheeler

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Ward Wheeler
Division of Invertebrate Zoology
American Museum of Natural History
Central Park West @ 79th St.
New York, NY 10024-5192
1-212-769-5754 (Voice)
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