5.10 Process-Wide Registration
| (require ffi/unsafe/global) | package: base |
The
ffi/unsafe/global library provides a utility
registering information that spans all places in the Racket
process.
Added in version 6.9.0.5 of package base.
procedure
(register-process-global key val) → cpointer?
key : bytes? val : cpointer?
Gets or sets a value in a process-global table (i.e., shared across
multiple places, if any).
If val is #f, the current mapping for key is reported.
If val is not #f, and no value has been installed for key, then the value is installed and #f is returned. If a value has already been installed, then no new value is installed and the old value is returned. The given val must not refer to garbage-collected memory.
This function is intended for infrequent use with a small number of keys.