SimpleEventBuilder/testing/is_epoll_really_thsafe/readme.md

Is epoll really thread safe?

Motivation

Scope of this test is simply to verify that TCP communication with epoll doesen't mix data. In particular, it's important to verify that if one big chunk is sent, the TCP protocol doesen't split it into different events for level triggered epoll (ofc it's gonna be splitted due to buf size).

The important thing is that if I send 1MB of data, it doesen't wake up 2 threads listening to the same fd just because TCP split the package (afaik that shouln't happen, but it's always better to verify, since epoll() is fundamentally broken)