039条件变量同步(Condition)

也是锁，这个锁多加了wait(),notify()唤醒一个进程,notifyall()唤醒全部进程方法，创建的时候默认是Rlock类型的锁，可以设置为lock类型的，默认就ok

from random import randint
import threading
import time

class Producer(threading.Thread):
    def run(self):
        global L
        while True:
            val = randint(0,100)
            print('生产者',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('消费者',self.name,'delete',str(L[0]),L)
            del L[0]
            lock_con.release()
        time.sleep(0.5)

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()

###########java改编：单生产单消费

import time
import threading

class Res:
    def __init__(self):
        self.flag = False
        self.count = 0
        self.product = ''

    def set(self,name):
        lock_con.acquire()
        if self.flag:
            lock_con.wait()
        time.sleep(0.00001)
        self.count += 1
        self.product = ''.join([name,'**',str(self.count)])
        self.message = ''.join([self.product,'__生产者__',str(threading.current_thread())])
        print(self.message)
        self.flag = True
        lock_con.notify()
        lock_con.release()

    def get_product(self):
        lock_con.acquire()
        time.sleep(0.00001)
        if not self.flag:
            lock_con.wait()
        self.message = ''.join([self.product,'__消费者__',str(threading.current_thread())])
        print(self.message)
        self.flag = False
        lock_con.notify()
        lock_con.release()

class Producer(threading.Thread):
    def __init__(self,r):
        threading.Thread.__init__(self)
        self.r = r

    def run(self):
        for i in range(100):
            self.r.set('大白兔奶糖')

class Consumer(threading.Thread):
    def __init__(self,r):
        threading.Thread.__init__(self)
        self.r = r

    def run(self):
        for i in range(100):
            self.r.get_product()

if __name__ == '__main__':
    lock_con = threading.Condition()
    r = Res()
    c = Consumer(r)
    p = Producer(r)
    c.start()
    p.start()

单生产单消费

############多生产多消费

import time
import threading

class Res:
    def __init__(self):
        self.flag = False
        self.count = 0
        self.product = ''

    def set(self,name):
        lock_con.acquire()
        while self.flag:
            lock_con.wait()
        time.sleep(0.00001)
        self.count += 1
        self.product = ''.join([name,'**',str(self.count)])
        self.message = ''.join([self.product,'__生产者__',str(threading.current_thread())])
        print(self.message)
        self.flag = True
        lock_con.notifyAll()
        lock_con.release()

    def get_product(self):
        lock_con.acquire()
        time.sleep(0.00001)
        while not self.flag:
            lock_con.wait()
        self.message = ''.join([self.product,'__消费者__',str(threading.current_thread())])
        print(self.message)
        self.flag = False
        lock_con.notifyAll()
        lock_con.release()

class Producer(threading.Thread):
    def __init__(self,r):
        threading.Thread.__init__(self)
        self.r = r

    def run(self):
        for i in range(100):
            self.r.set('大白兔奶糖')

class Consumer(threading.Thread):
    def __init__(self,r):
        threading.Thread.__init__(self)
        self.r = r

    def run(self):
        for i in range(100):
            self.r.get_product()

if __name__ == '__main__':
    lock_con = threading.Condition()
    r = Res()
    l = []
    for i in range(5):
        l.append(Consumer(r))
    for i in range(5):
        l.append(Producer(r))
    for a in l:
        a.start()

个人觉得例子理解是最好的，所以我学的东西一般使用例子