If I understand it correctly, Cyclone does not implement SRFI 18 fully; see the last two procedures here: https://justinethier.github.io/cyclone/docs/api/srfi/18.

Am Di., 31. Aug. 2021 um 10:54 Uhr schrieb Lassi Kortela <xxxxxx@lassi.io>:

> a system with an existing SRFI 18 implementation of native OS threads

I started a survey at https://doc.scheme.org/surveys/threads/ (PR
https://github.com/schemedoc/surveys/pull/17). If anyone has more info,
or can spend some time to find it, please reply via email or in the PR.