Python多线程编程（七）：使用Condition实现复杂同步

'''
Created on 2012-9-8
 
@author: walfred
@module: thread.TreadTest7
''' 
 
import threading 
import time 
 
condition = threading.Condition() 
products = 0 
 
class Producer(threading.Thread): 
    def __init__(self): 
        threading.Thread.__init__(self) 
 
    def run(self): 
        global condition, products 
        while True: 
            if condition.acquire(): 
                if products < 10: 
                    products += 1; 
                    print "Producer(%s):deliver one, now products:%s" %(self.name, products) 
                    condition.notify() 
                else: 
                    print "Producer(%s):already 10, stop deliver, now products:%s" %(self.name, products) 
                    condition.wait(); 
                condition.release() 
                time.sleep(2) 
 
class Consumer(threading.Thread): 
    def __init__(self): 
        threading.Thread.__init__(self) 
 
    def run(self): 
        global condition, products 
        while True: 
            if condition.acquire(): 
                if products > 1: 
                    products -= 1 
                    print "Consumer(%s):consume one, now products:%s" %(self.name, products) 
                    condition.notify() 
                else: 
                    print "Consumer(%s):only 1, stop consume, products:%s" %(self.name, products) 
                    condition.wait(); 
                condition.release() 
                time.sleep(2) 
 
if __name__ == "__main__": 
    for p in range(0, 2): 
        p = Producer() 
        p.start() 
 
    for c in range(0, 10): 
        c = Consumer() 
        c.start()

Producer(Thread-1):deliver one, now products:1
Producer(Thread-2):deliver one, now products:2
Consumer(Thread-3):consume one, now products:1
Consumer(Thread-4):only 1, stop consume, products:1
Consumer(Thread-5):only 1, stop consume, products:1
Consumer(Thread-6):only 1, stop consume, products:1
Consumer(Thread-7):only 1, stop consume, products:1
Consumer(Thread-8):only 1, stop consume, products:1
Consumer(Thread-10):only 1, stop consume, products:1
Consumer(Thread-9):only 1, stop consume, products:1
Consumer(Thread-12):only 1, stop consume, products:1
Consumer(Thread-11):only 1, stop consume, products:1