LispWorks User Guide and Reference Manual
Native threads and foreign code
Support for native threads differs between platforms as described in this section.
15.12.1 Native threads on Windows, Mac OS X, Linux, x86/x64 Solaris and FreeBSD
15.12.2 Native threads on other platforms
15.12.3 Foreign callbacks on threads not created by Lisp
LispWorks User Guide and Reference Manual - 22 Dec 2009