def __init__(self, maxsize, hub=None):
if hub is None:
hub = get_hub()
self.hub = hub
self.pid = os.getpid()
self.manager = None
self.task_queue = Queue()
self.fork_watcher = None
self._worker_greenlets = set()
self._maxsize = 0
# Note that by starting with 1, we actually allow
# maxsize + 1 tasks in the queue.
self._available_worker_threads_greenlet_sem = Semaphore(1, hub)
self._set_maxsize(maxsize)
self.fork_watcher = hub.loop.fork(ref=False)
def _init(self, maxsize):
self._size = 0
self._semaphore = Semaphore(1)
self._lock = Lock()
self.task_queue = Queue()
self._set_maxsize(maxsize)
