參考博客： www.cnblogs.com/yuanchenqi/articles/5733873.html

semaphore 信號量：

condition 條件變量：

event 同步條件：條件同步和條件變量同步差不多意思，只是少了鎖功能。因為條件同步設計於別訪問共享資源的條件環境

多線程利器（queue）：隊列本身有一把鎖

q.put(‘xiaoming’, 0)

q.get(0)

q.qsize() 返回隊列大小

q.empty()

q.full()

semaphore：

# _author: lily
# _date: 2019/1/29

import threading , time

 
class MyThread(threading.Thread):
    def run(self):
        if semaphore.acquire():
            print(self.name)
            time.sleep(3)
            semaphore.release()

if __name__ == ‘__main__‘:
    semaphore = threading.BoundedSemaphore(5)
    thread_list = []
    for i in range(100):
        thread_list.append(MyThread())
    
 
for i in thread_list:
        i.start()

condition：

# _author: lily
# _date: 2019/1/29

import threading,time
from random import randint

class Producer(threading.Thread):
    def run(self):
        global L
        while True:
            val = randint(0, 100)
            print(‘Producer‘, self.name, ‘
 
: Append‘, str(val), L)
            if lock_con.acquire():
                L.append(val)
                lock_con.notify()
                lock_con.release()
            time.sleep(3)

class Consumer(threading.Thread):
    def run(self):
        global L
        while True:
            lock_con.acquire()
            if len(L) == 0:
                lock_con.wait()
                print(‘Consumer‘, self.name, ‘: Delete‘, str(L[0]), L)
                del L[0]
                lock_con.release()
                time.sleep(0.25)


if __name__ == ‘__main__‘:
    L = []
    lock_con = threading.Condition()
    threads = []
    for i in range(5):
        threads.append(Producer())
    threads.append(Consumer())
    for t in threads:
        t.start()
    for t in threads:
        t.join()

queue：

# _author: lily
# _date: 2019/1/30

import queue

# q = queue.Queue()

q = queue.Queue(3)  # 設置隊列大小
q.put(‘xiaoming‘, 0)
q.put(‘xiaohong‘)
q.put(‘xiaofang‘, 0)   # 隊列大小為 2 ，當要放置第三個數據的時候，1會被阻塞，0會報錯。默認參數為1

print(q.get())
print(q.get())
print(q.get())
print(q.get(0))   # 參數為 0 的時候如果隊列空了，還去取值，就會報錯。參數為 1 會被阻塞

27 python 初學（信號量、條件變量、同步條件、隊列）