Sharing complex objects across worker threads?

Is there a way to share DB pool object across the worker threads. Any attempts to send such object to the worker thread from the main thread via the pool.exec(...) call gives a DataCloneError since that object has a function reference. Also even though the worker threads are part of the same process ( i might be wrong here ) every time we "require" a module in the worker it gets a fresh copy instead getting a same copy from cache. This means we cannot use this module where DB connectivity is required.