[docs] [issue29795] Clarify how to share multiprocessing primitives

Max added the comment: How about inserting this text somewhere: Note that sharing and synchronization objects (such as `Queue()`, `Pipe()`, `Manager()`, `Lock()`, `Semaphore()`) should be made available to a new process by passing them as arguments to the `target` function invoked by the `run()` method. Making these objects visible through global variables will only work when the process was started using `fork` (and as such sacrifices portability for no special benefit). ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue29795> _______________________________________