1 from queue import PriorityQueue
2 import time
3 import random
4 import threading
5
6
7 class CompareAble:
8 # 定义一个可比较对象
9 def __init__(self, priority, job_name):
10 self.priority = priority
11 self.jobname = job_name
12
13 def __lt__(self, other):
14 if self.priority > other.priority:
15 return False
16 else:
17 return True
18
19
20 tasks = [(i, "do task %s" % i) for i in range(10, 100, 5)]
21
22
23 def produce(pq, lock):
24 while True:
25 lock.acquire()
26 task = tasks[random.randint(0, len(tasks)-1)]
27 print('put %s %s in pq' % (task[0], task[1]))
28 pq.put(CompareAble(task[0], task[1]))
29 lock.release()
30 time.sleep(1)
31
32
33 def consumer(pq, lock):
34 while True:
35 lock.acquire()
36 try:
37 if pq.empty():
38 continue
39 task = pq.get_nowait()
40 if task:
41 print(task.priority, task.jobname)
42 finally:
43 lock.release()
44 time.sleep(1)
45
46
47 if __name__ == '__main__':
48 task_queue = PriorityQueue()
49 task_lock = threading.Lock()
50 for i in range(3):
51 t = threading.Thread(target=produce, args=(task_queue, task_lock))
52 t.setDaemon(True) # 设置为守护进程
53 t.start()
54 for i in range(2):
55 t = threading.Thread(target=consumer, args=(task_queue, task_lock))
56 t.setDaemon(True)
57 t.start()
58 time.sleep(30)
59 print("over")
t.setDaemon(True) 主线程退出，子线程t也跟着退出
可比较对象中 def __lt__(self, other): 返回True的优先被get出来
