对Python线程池进行详细说明
下面给大家总结一下自己总结的对Python线程池经验之谈,对于那些没有接触学习过编程语言或者多开发语言略懂的用户而言,Python语言绝对是最好的选择之一,并建议初学的程序员先从Python开始学习编程。
import Queue, threading, sys from threading import Thread import time,urllib # working thread class Worker(Thread): worker_count = 0 def __init__( self, workQueue, resultQueue, timeout = 0, **kwds): Thread.__init__( self, **kwds ) self.id = Worker.worker_count Worker.worker_count += 1 self.setDaemon( True ) self.workQueue = workQueue self.resultQueue = resultQueue self.timeout = timeout self.start( ) def run( self ): ''' the get-some-work, do-some-work main loop of worker threads ''' while True: try: callable, args, kwds = self.workQueue.get(timeout=self.timeout) res = callable(*args, **kwds) print "worker[%2d]: %s" % (self.id, str(res) ) self.resultQueue.put( res ) except Queue.Empty: break except : print 'worker[%2d]' % self.id, sys.exc_info()[:2] class WorkerManager: def __init__( self, num_of_workers=10, timeout = 1): self.workQueue = Queue.Queue() self.resultQueue = Queue.Queue() self.workers = [] self.timeout = timeout self._recruitThreads( num_of_workers ) def _recruitThreads( self, num_of_workers ): for i in range( num_of_workers ): worker = Worker( self.workQueue, self.resultQueue, self.timeout ) self.workers.append(worker) def wait_for_complete( self): # ...then, wait for each of them to terminate: while len(self.workers): worker = self.workers.pop() worker.join( ) if worker.isAlive() and not self.workQueue.empty(): self.workers.append( worker ) print "All jobs are are completed." def add_job( self, callable, *args, **kwds ): self.workQueue.put( (callable, args, kwds) ) def get_result( self, *args, **kwds ): return self.resultQueue.get( *args, **kwds )
Worker类是一个Python线程池,不断地从workQueue队列中获取需要执行的任务,执行之,并将结果写入到resultQueue中。这里的workQueue和resultQueue都是现成安全的,其内部对各个线程的操作做了互斥。当从workQueue中获取任务超时,则线程结束。
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