One of the specific set of places defined for low level atomic operations.
A number, default value 1.
The macro
atomic-decf
is like
decf
and
atomic-incf
is like
incf
, except that they are guaranteed atomic for a suitable place.
place must be one of the places described in Low level atomic operations, or expand to one of them.
Unlike atomic-fixnum-decf and
atomic-fixnum-incf
, these macros can deal with any number.
LispWorks User Guide and Reference Manual - 21 Dec 2011