rif <[EMAIL PROTECTED]> writes:

> I also tried a call of the form (in my program)
> 
> (system:vector-sap array)
> 
> But this causes segmentation violations inside the called C
> function, which I don't get if I allocate an alien object of the
> same size and pass that.  Any idea what to do?

This might be due to a GC happening at the wrong moment. At the end of
section 8.7.5 in the CMUCL manual they say

  "In this example, it may be useful to wrap the inner let expression
   in an unwind-protect that first turns off garbage collection and
   then turns garbage collection on afterwards. This will prevent
   garbage collection from moving x and y after we have obtained the
   (now erroneous) addresses but before the call to dotprod is made."

Did you do that?

Edi.

PS: Did I do that in my code? Ooops, no....


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