src: protect global state with mutexes
Protect environment variables and inherently per-process state (e.g. the process title) with mutexes, to better accomodate Node’s usage in multi-threading environments.
Thanks to Stephen Belanger for reviewing this change in its original PR.
Refs: https://github.com/ayojs/ayo/pull/82
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines