获取线程号和杀不死的NSThread线程

最近我遇到长连接线程，在执行connect闪断导致永远阻塞线程，结果我想杀死这个阻塞的线程，用了九牛二之力也杀不死。希望高手指点一二。我用了伟大的kill -9 pid仍旧干不死它，不甘心啊！
估计是当线程在执行sleep时，不能被杀死。当线程处于wait状态才能被杀死。

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{        [[NSThread currentThread] setName:@"socket thread"];        _socketThread = [NSThread currentThread];//        _socketThread.description;//        [[NSThread currentThread] start];//        while(!_socketThread.is())//        {//            //        }//        _socketThread.stop();        NSString * socketThreadDescription = [NSThread currentThread].description;        NSRange range = [socketThreadDescription rangeOfString:@"number = "];        NSRange range1 = [socketThreadDescription rangeOfString:@","];        if((range.length <= 0) || ((range1.length <= 0)))        {            _socketThreadSno = -1;        }        else        {            range = NSMakeRange (range.location + range.length, range1.location - range.location - range.length);            NSString *number = [socketThreadDescription substringWithRange : range];            _socketThreadSno = [number longLongValue];        }    }下面这个普通的NSThread线程获取线程号和上面那个略有不同-(void)socketNSThread{    [[NSThread currentThread] setName:@"socket thread"];    _socketThread = [NSThread currentThread];    //        _socketThread.description;    //        [[NSThread currentThread] start];    //        while(!_socketThread.is())    //        {    //    //        }    //        _socketThread.stop();    NSString * socketThreadDescription = [NSThread currentThread].description;//    NSRange range = [socketThreadDescription rangeOfString:@"number = "];//    NSRange range1 = [socketThreadDescription rangeOfString:@","];//    if((range.length <= 0) || ((range1.length <= 0)))//    {//        _socketThreadSno = -1;//    }//    else//    {//        range = NSMakeRange (range.location + range.length, range1.location - range.location - range.length);//        NSString *number = [socketThreadDescription substringWithRange : range];//        _socketThreadSno = [number longLongValue];//    }    NSRange range = [socketThreadDescription rangeOfString:@"num = "];    NSRange range1 = [socketThreadDescription rangeOfString:@"}"];    if((range.length <= 0) || ((range1.length <= 0)))    {        _socketThreadSno = -1;    }    else    {        range = NSMakeRange (range.location + range.length, range1.location - range.location - range.length);        NSString *number = [socketThreadDescription substringWithRange : range];        _socketThreadSno = [number longLongValue];    }    //        kill(6, SIGABRT);    FLDDLogDebug(@"socket thread");}试过杀线程的方法如下，但都以失败告终，就是我关闭那个连接的socket都引起不了connect的响应。让人无语了！//   下线- (void)OffLine{    FLDDLogDebug(@"函数");    FLDDLogDebug(@"offLine");    long long sno = [SingleAsyncSocket sharedInstance].socketThreadSno;    if(-1 != sno)    {//        [[SingleAsyncSocket sharedInstance] endSocket];         kill((pid_t)sno, SIGKILL);//        pthread_kill((__bridge pthread_t)([SingleAsyncSocket sharedInstance].socketThread), SIGQUIT);        [[SingleAsyncSocket sharedInstance].socketThread cancel];    }    return;}