evmaps cannot be used in `lazy_static`? about left-right HOT 1 CLOSED

Hi there!

As the answer on your SO question points out, evmap does not allow you to take a single ReadHandle and share it among threads. And this is intentional. Part of the way evmap achieves its concurrency is by keeping some local state with each reader; this means that even though each ReadHandle method takes an &self, it is actually modifying its internal state behind the scenes (which is only safe within the confines of a single thread).

The way to achieve what you are after is to keep a global Mutex<ReadHandle>, and to have each thread that wants to read clone that ReadHandle on its first read, and then re-use that same handle on subsequent reads. You should also think about whether you really want to use a static here -- statics are shared across all threads of your program, including tests, which means that you probably won't be able to run your tests in parallel (or even sequentially without cleanup).

from left-right.