Certain behavior of the interpreter and compiled programs can be
customized via 'parameters', where a parameter is a procedure of
zero or one arguments. To retrieve the value of a parameter call the
parameter-procedure with zero arguments. To change the setting of the
parameter, call the parameter-procedure with the new value as argument:
(define foo (make-parameter 123))
(foo) ==> 123
(foo 99)
(foo) ==> 99
Parameters are fully thread-local, each thread of execution
owns a local copy of a parameters' value.
Chicken implements SRFI-39 (See also: 11
(See also: make-parameter and parameterize)
-
- [parameter] case-sensitive
-
If true, then read reads symbols and identifiers in
case-sensitive mode and uppercase characters in symbols are printed
escaped. Defaults to #t.
- [parameter] dynamic-load-libraries
-
A list of strings containing shared libraries that should be checked
for explicitly loaded library units (this facility is not available on
all platforms). See load-library.
- [parameter] command-line-arguments
-
Contains the list of arguments passed to this program, with the name of
the program removed.
- [parameter] exit-handler
-
A procedure of a single optional argument. When exit is called,
then this procedure will be invoked with the exit-code as argument. The
default behavior is to terminate the program.
- [parameter] eval-handler
-
A procedure of one or two arguments. When eval is invoked, it
calls the value of this parameter with the same arguments. The default
behavior is to evaluate the argument expression and to ignore the
second parameter.
- [parameter] force-finalizers
-
If true, force and execute all pending finalizers before exiting the
program (either explicitly by exit or implicitly when the last
toplevel expression has been executed). Default is #t.
- [parameter] implicit-exit-handler
-
A procedure of no arguments. When the last toplevel expression of the
program has executed, then the value of this parameter is called. The
default behaviour is to do nothing, or, if one or more entry-points
were defined (see: 6.3) to enter a loop that waits for
callbacks from the host program.
- [parameter] keyword-style
-
Enables alternative keyword syntax, where STYLE may be either
#:prefix (as in Common Lisp) or #:suffix (as in DSSSL).
Any other value disables the alternative syntaxes.
- [parameter] load-verbose
-
A boolean indicating whether loading of source files, compiled code
(if available) and compiled libraries should display a message.
- [parameter] reset-handler
-
A procedure of zero arguments that is called via reset. The
default behavior in compiled code is to invoke the value of
(exit-handler). The default behavior in the interpreter is to
abort the current computation and to restart the read-eval-print loop.
- [parameter] strict-reader
-
If true, then most non-standard read syntax is disabled. Defaults to
#f.