I have an application in C++ we originally made for Windows using Microsoft's http lib, that I have ported to be cross-platform using nginx. To keep it working mostly the same (rewriting as little as possible), I made it as a lib that gets loaded by a module I made for nginx that communicates with it via a C interface with simple functions (startup, shutdown, callEndpoint). It works for any calls that don't depend on threads, but anything that depends on the worker threads that we create (not using nginx's apis) doesn't work. When I attach to either of the nginx processes with gdb and do `info threads`, I only see one thread each.

I set our function that loads the lib, then calls startup(), which launches these worker threads, as the "init module" function. The handle for the lib remains so many of the calls work just fine. But the threads are gone, so anything that depends on these worker threads doesn't function (it freezes actually). Is there a way to let my module start threads without having to use nginx's api or otherwise drastically change my architecture?