5.12 Process-Wide and Place-Wide Registration
|(require ffi/unsafe/global)||package: base|
The ffi/unsafe/global library provides a utility registering information that is local to a place or spans all places in the Racket process.
Added in version 220.127.116.11 of package base.
(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.
(get-place-table) → hash?
Returns a place-specific, mutable, eq?-based hash table. The result is always the same for a particular place.
Added in version 18.104.22.168 of package base.