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！

    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;
}