I'd like to bump this ancient question, but now with a new twist: mex wrapper with OpenMP. I need to compute the convexhulls of hundreds of thousands of configurations that include thousands of points, and parfor blows up my RAM.
Is it possible to run qHull, even as an external library, within a mex file that is running multiple threads? I'm not sure, but there seems to be reason to believe that memory allocation within mex files is not thread safe.
Thanks, Rodrigo