Python多线程实例

特别注意：
加锁的位置一定要只包住临界资源，如：

self.stateLock.acquire()
tstate = self.state
self.stateLock.release()

class NetworkMgr(object):
    '''
        网络设置管理
    '''
    
    def __init__(self):
        
        self.state = True
        self.getThread = None
        self.stateLock = threading.RLock()
        self.sleeptime = 3
        self.thdRun = False
        self.start_ping_thread()
    
    def start_ping_thread(self):
        '''
                    开启获取网络连接的线程
        '''
        self.thdRun = True
        self.getThread = threading.Thread(target = NetworkMgr.ping_network, kwargs = {'me':self})
        self.getThread.setDaemon(True)
        self.getThread.start()
        
    def get_network_state(self):
        '''
                    获取网络状态
                    返回值：
            0:连接正常。-1:连接失败
        '''
        tstate = True
        self.stateLock.acquire()
        tstate = self.state
        self.stateLock.release()
        return tstate
        
    @staticmethod
    def ping_network(me):
        '''
        ping网络连接，成功将self.state置为0，失败将self.state置为-1
        '''
        while me.thdRun:
            
            node = 'us.i-dong.com'
            alive = 0; timeout = 1.0; ipv6 = 0; count = 4#默认ping4次
            flood = 0; size = IdongPing.ICMP_DATA_STR
            ret = IdongPing.pingNode(alive, timeout, ipv6, count, node, flood, size)
            me.stateLock.acquire()
            me.state = ret
            me.stateLock.release()
            sleep(me.sleeptime)