Python のスレッド同期プリミティブのコード例

from time import ctime,sleep
event = Event()

def event_wait():
    print(ctime())
    event.wait()
    print('这是event_wait方法中的时间',ctime())

def event_set(n):
    sleep(n)
    event.set()
    print('这是event_set方法中的时间', ctime())

thread1 = Thread(target=event_wait)
thread2 = Thread(target=event_set,args=(3,))

thread1.start()
thread2.start()

Sat Nov 17 10:01:05 2018
这是event_wait方法中的时间 Sat Nov 17 10:01:08 2018
这是event_set方法中的时间  Sat Nov 17 10:01:08 2018

from threading import Event
from  threading import Thread
import threading

event = Event()

def do_wait(athlete):
    racetrack = threading.current_thread().getName()
    print('%s准备就绪' % racetrack)
    event.wait()
    print('%s听到枪声，起跑！'%athlete)

thread1 = Thread(target=do_wait,args=("A",))
thread2 = Thread(target=do_wait,args=("B",))
thread3 = Thread(target=do_wait,args=("C",))
thread4 = Thread(target=do_wait,args=("D",))
thread5 = Thread(target=do_wait,args=("E",))

threads = []
threads.append(thread1)
threads.append(thread2)
threads.append(thread3)
threads.append(thread4)
threads.append(thread5)

for th in threads:
    th.start()

event.set()  #这个set()方法很关键，同时对5个线程中的event进行set操作

Thread-1准备就绪
Thread-2准备就绪
Thread-3准备就绪
Thread-4准备就绪
Thread-5准备就绪
E听到枪声，起跑！
A听到枪声，起跑！
B听到枪声，起跑！
D听到枪声，起跑！
C听到枪声，起跑！

from threading import BoundedSemaphore,Lock,Thread
from time import sleep
from random import randrange

lock = Lock()
num = 6
hotel = BoundedSemaphore(num)

def logout():
    lock.acquire()
    print('I want to logout')
    print('A customer logout...')
    try:
        hotel.release()
        print('Welcome again')
    except ValueError:
        print('Sorry,wait a moment.')
    lock.release()

def login():
    lock.acquire()
    print('I want to login')
    print('A customer login...')
    if hotel.acquire(False):
        print('Ok,your room number is...')
    else:
        print('Sorry,our hotel is full')
    lock.release()

#房东
def producer(loops):
    for i in range(loops):
        logout()
        print('还剩%s' % hotel._value, '房间')
        sleep(randrange(2))
#租客
def consumer(loops):
    for i in range(loops):
        login()
        print('还剩%s' % hotel._value, '房间')
        sleep(randrange(2))
def main():
    print('Start')
    room_num = hotel._value
    print('The hotel is full with %s room'%room_num)
    #原本有2个住户
    hotel.acquire()
    hotel.acquire()
    thread1 = Thread(target=producer,args=(randrange(2,8),))
    thread2 = Thread(target=consumer,args=(randrange(2,8),))
    thread1.start()
    thread2.start()

if __name__ == '__main__':
    main()

The hotel is full with 6 room
I want to logout
A customer logout...
Welcome again
还剩5 房间
I want to logout
A customer logout...
Welcome again
还剩6 房间
I want to login
A customer login...
Ok,your room number is...
还剩5 房间
I want to login
A customer login...
Ok,your room number is...
还剩4 房间