Provides a way to check whether there was any "modification" during execution of a body of code.
The macro
with-modification-check-macro
, together with the macro with-modification-change, provides a way for a body of code to execute and check whether there was any "modification" during this execution, where modification is execution of some other piece of code.
with-modification-check-macro
defines a lexical macro (by macrolet) with the name
macro-name
which takes no arguments, and is used to check if there was any change since entering the body.
modification-place must be initialized to a fixnum. It must not be modified by any code except with-modification-change.
See Aids for implementing modification checks for the full description and an example.
modification-place does not need to be one of the places defined for low level atomic operations.
LispWorks User Guide and Reference Manual - 21 Dec 2011