Python 執行緒 條件鎖 生產者消費者模型

code

import threading

from
threading import thread
from
threading import condition
import time
import random
c =condition()  # 條件鎖
itemnum = 0
item = 0
def consumer():  # 消費者
global
item  # 商品編號
global
itemnum
c.acquire()  # 鎖住資源
while
0 ==itemnum:  # 如無產品則讓執行緒等待
print(
"consumer :掛起.
", threading.current_thread().name, threading.current_thread())
c.wait()
itemnum -= 1
print(
"consumer : 消費 %s.
" %item, itemnum, threading.current_thread().name, threading.current_thread())
c.release()  # 解鎖資源
def producer():  # 生產者
global
item  # 商品編號
global
itemnum
time.sleep(3)
c.acquire()  # 鎖住資源
item = random.randint(1, 1000
)    itemnum += 1
print(
"producer : 生產 %s.
" %item, threading.current_thread().name, threading.current_thread())
c.notifyall()  # 喚醒所有等待的執行緒--》其實就是喚醒消費者程序
c.release()  # 解鎖資源
threads =  # 執行緒收集列表
for i in range(0, 4
):  # 使用迴圈完成生產者與消費者執行緒的建立
t1 = thread(target=producer, name=f'
pro_')
t2 = thread(target=consumer, name=f"
cos_")
t1.start()
t2.start()
for t in
threads:  # 等待所有執行緒完成
t.join()

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