生产者消费者之Java/python实现

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java实现版

/**  * 生产者线程，负责生产公共资源  */   class ProducerThread implements Runnable {      private PublicResource resource;        public ProducerThread(PublicResource resource) {          this.resource = resource;      }        @Override      public void run() {          for (int i = 0; i < 10; i++) {              try {                  Thread.sleep((long) (Math.random() * 10));              } catch (InterruptedException e) {                  e.printStackTrace();              }              resource.increace();          }      }  }  /**  * 消费者线程，负责消费公共资源  */   class ConsumerThread implements Runnable {      private PublicResource resource;        public ConsumerThread(PublicResource resource) {          this.resource = resource;      }        @Override      public void run() {          for (int i = 0; i < 10; i++) {              try {                  Thread.sleep((long) (Math.random() * 1000));              } catch (InterruptedException e) {                  e.printStackTrace();              }              resource.decreace();          }      }  }  /**  * 公共资源类  */   class PublicResource {      private int number = 0;        /**      * 增加公共资源      */      public synchronized void increace() {          while (number != 0) {              try {                  wait();              } catch (InterruptedException e) {                  e.printStackTrace();              }          }          number++;          System.out.println(number);          notify();      }        /**      * 减少公共资源      */      public synchronized void decreace() {          while (number == 0) {              try {                  wait();              } catch (InterruptedException e) {                  e.printStackTrace();              }          }          number--;          System.out.println(number);          notify();      }  } public class ProducerConsumerTest {      public static void main(String[] args) {          PublicResource resource = new PublicResource();          new Thread(new ProducerThread(resource)).start();          new Thread(new ConsumerThread(resource)).start();          new Thread(new ProducerThread(resource)).start();          new Thread(new ConsumerThread(resource)).start();          new Thread(new ProducerThread(resource)).start();          new Thread(new ConsumerThread(resource)).start();      }  }

python实现版

Python的线程是真正的Posix Thread，而不是模拟出来的线程。 Python的标准库提供了两个模块：thread和threading，thread是低级模块，threading是高级模块，对_thread进行了封装。绝大多数情况下，我们只需要使用threading这个高级模块。

Python中的Queue模块已经提供了对线程同步的支持，所以本文并没有涉及锁、同步、死锁等多线程问题。

#-*- coding:UTF-8 -*-from Queue import Queueimport random,threading,time#生产者类class Producer(threading.Thread):    def __init__(self, name,queue):        threading.Thread.__init__(self, name=name)        self.data=queue    def run(self):        for i in range(5):            print("%s is producing %d to the queue!" % (self.getName(), i))            self.data.put(i)            time.sleep(random.randrange(10)/5)        print("%s finished!" % self.getName())#消费者类class Consumer(threading.Thread):    def __init__(self,name,queue):        threading.Thread.__init__(self,name=name)        self.data=queue    def run(self):        for i in range(5):            val = self.data.get()            print("%s is consuming. %d in the queue is consumed!" % (self.getName(),val))            time.sleep(random.randrange(10))        print("%s finished!" % self.getName())def main():    queue = Queue()    producer = Producer('Producer',queue)    consumer = Consumer('Consumer',queue)    producer.start()    consumer.start()    producer.join()    consumer.join()    print 'All threads finished!'if __name__ == '__main__':    main()

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