class PQueue:
def __init__(task: Callable):
self._lock = RLock()
self._active = 0
self._done = False
self._q_task = Queue()
self._q_result = Queue()
self._pool = None
self._task = task
def push(item):
with self._lock:
self._q_task.push(item)
def generate():
self._q_result.clear()
self._done = False
self._active = 0
cpu = cpu_count()
self._pool = Pool(cpu)
def run_tasks():
while not self._done:
t = None
with self._lock:
try:
t = self._q_task.get_nowait()
except Queue.Empty:
t = None
if t is not None:
self._active += 1
if t is not None:
for r in self._task(t):
self._q_result.put(r, 100)
with self._lock:
self._active -= 1
for _ in range(cpu):
self._pool.apply_async(run_tasks, ())
while not self._done:
with self._lock:
if not self._active and self._q_task.empty():
self._done = True
while not self._q_result.empty():
r = self._q_result.get(True, 100)
if r is not None:
yield r
self._pool.join()
self._pool.close()
self._pool = None
