ServerSocketChannel超时？不超时？

Netty的org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink

中有下面一段代码:

public class ServerSocketAdaptor// package-private    extends ServerSocket{.......    public Socket accept() throws IOException {synchronized (ssc.blockingLock()) {    if (!ssc.isBound())throw new IllegalBlockingModeException();    try {if (timeout == 0) {    SocketChannel sc = ssc.accept();    if (sc == null && !ssc.isBlocking())throw new IllegalBlockingModeException();    return sc.socket();}[color=red]// Implement timeout with a selector[/color]SelectionKey sk = null;Selector sel = null;ssc.configureBlocking(false);try {    SocketChannel sc;    if ((sc = ssc.accept()) != null)return sc.socket();    sel = Util.getTemporarySelector(ssc);    sk = ssc.register(sel, SelectionKey.OP_ACCEPT);    long to = timeout;    for (;;) {                        if (!ssc.isOpen())     throw new ClosedChannelException();long st = System.currentTimeMillis();int ns = sel.select(to);if (ns > 0 &&    sk.isAcceptable() && ((sc = ssc.accept()) != null))    return sc.socket();sel.selectedKeys().remove(sk);to -= System.currentTimeMillis() - st;[color=red]if (to <= 0)    throw new SocketTimeoutException();[/color]    }} finally {    if (sk != null)sk.cancel();    if (ssc.isOpen())ssc.configureBlocking(true);    if (sel != null)                        Util.releaseTemporarySelector(sel);}    } catch (Exception x) {Net.translateException(x);assert false;return null;// Never happens    }}    }}

按楼主的例子，抛出异常的点在代码的红色部分，可以看到在使用selector模拟实现超时的时候，抛出的超时异常
6 楼 kingquake21 2011-06-09 如果设置了超时，采用ssc.socket().accept()的方式，会先把ssc改为非阻塞模式，然后在finally里面又修改为阻塞模式 7 楼 gongxuxuxu 2012-08-24 接收的超时 一般是看你的事件等待周期的...

比如

while(继续接收吗?)
{
select(单个模块的超时接收事件)
{
//同样的道理. 读超时 也是这样做即可.
}

}