15.3 Atomicity and thread safety of the LispWorks implementation

Access to all Common Lisp objects is thread safe in the sense that it does not cause an error because of threading issues.

15.3.1 Immutable objects

15.3.2 Mutable objects supporting atomic access

15.3.3 Mutable objects not supporting atomic access

15.3.4 Issues with order of memory accesses

15.3.5 Single-thread context arrays and hash-tables

LispWorks User Guide and Reference Manual - 21 Dec 2011