mutex-owner Mikael Djurfeldt 08 Apr 2000 14:53 UTC

In order to implement `mutex-owner' we need to be able to inspect the
mutex.  If the implementation is based upon a non-custom threads
library, such facilities may not be available.  For example, the POSIX
threads interface doesn't provide it.

I'm thus afraid that `mutex-owner' demands too much of the
implementation.