> Is it safe to use enter_blocking_section() and leave_blocking_section()
> calls from my C function like this:
> 
> void testSleep( value timev )
> {
>   CAMLparam1(timev);
>   int time = Int_val(timev);
>   enter_blocking_section();
>   sleep(time);
>   leave_blocking_section();
>   CAMLreturn0;
> }

Yes, that's the intended usage.

> If yes, why are they not included in installed headers?

Oversight.  The development version now installs <caml/signals.h>
that declares {enter,leave}_blocking_section.

- Xavier Leroy

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