我正在尝试使用apply_async运行一些代码。 并把logging.info（）检查它是否按预期工作。 （预期的非阻塞操作）
我的结果是，apply_async用作阻止操作而不是非阻止操作。
请让我知道为什么。
class DetectThread(QThread):
def run(self):
pool = Pool(processes=4)
"""
...... some ops. here
"""
cap = cv2.VideoCapture(0)
while True:
logging.info("while - begin ")
ret, frame = cap.read()
proc = pool.apply_async(self.function_to_call, args=())
idx_frame = idx_frame + 1
logging.info(" apply_async - end ")
"""
...... some ops. here
"""
logging.info("while - end ")
def function_to_call(self, some args):
logging.info(" function_to_call - start ")
orig_frame = frame.copy()
"""
...... some ops. here
"""
idx = idx + 1
logging.info(" function_to_call - end ")
return idx
我的结果是，
1458 Dummy-1 while - begin 1642 Dummy-1 apply_async - start 1683 Dummy-1 function_to_call - start 1763 Dummy-1 function_to_call - end 1765 Dummy-1 apply_async - end 1872 Dummy-1 while - end 1872 Dummy-1 while - begin 2466 Dummy-1 apply_async - start 2488 Dummy-1 function_to_call - start 2553 Dummy-1 function_to_call - end 2555 Dummy-1 apply_async - end 2594 Dummy-1 while - end