Method with_worker

src/thread_pool.rs:388–396

(&'static self, func: F)

                        })
                        .unwrap();
                    let control = ThreadControl { halt, handle };
                    managed_workers.push(ManagedWorker {
                        member_index,
                        control,
                    });
                }

                managed_workers.len()
            }
            // The size decreased
            cmp::Ordering::Less => {
                // Pull the workers we intend to halt out of the thread manager.