Please ensure, that:
- you do not have any open handles (DB connections, Files, ...) when:
- executing the create method
- you are not using objects in the child process, that are going to close shared resources (f.e. in the __destruct method)
- your child processes create their own handles (DB connections, Files, ...)
- you use the semaphore or other locking mechanisms, when accessing shared ressources
THE STRAIGHT TIP: In case you need handles (f.e. DB connections) in your child processes, open them in the onProcessCreate method and close them in the onProcessDestroy method