在等待连接期间，线程究竟挂在 ServerSocket.accept() 的什么位置？

Question

在下面的块中，我了解到这个主线程正在阻塞，因此没有监听来自其他线程的中断，但这是否意味着它真的挂在 ServerSocket.accept() 行上？

        ServerSocket serverSocket = new ServerSocket(8080);

        while(true){ // Block until accept
            Socket acceptedSocket = serverSocket.accept(); // Give accepted socket OR NULL SOCKET to acceptedSocket

            handle(acceptedSocket);

            serverSocket.close();
        }

我问是因为我不明白它会在哪里挂断接受 (ServerSocket.java):

public Socket accept() throws IOException {
        if (isClosed()) // No its open
            throw new SocketException("Socket is closed");
        if (!isBound())   // No its bound to 8080
            throw new SocketException("Socket is not bound yet");
        Socket s = new Socket((SocketImpl) null);                  // Create a null socket
        implAccept(s);                                          // Here???
        return s;
    }

ServerSocket.java 再一次：

protected final void implAccept(Socket s) throws IOException {


  SocketImpl si = null;
    try {
        if (s.impl == null)
          s.setImpl();
        else {
            s.impl.reset();
        }
        si = s.impl;
        s.impl = null;
        si.address = new InetAddress();
        si.fd = new FileDescriptor();
        getImpl().accept(si);    // I'm thinking its here but when I look at this accept, thats an abstract method and don't know where to dig deeper.

Answer 1

取决于OS，但在Linux，accept()是内核调用。最直接的 Java 实现是使用该内核调用。

所以过程是'waiting in the kernel'，粗略地说。

在等待连接期间，线程究竟挂在 ServerSocket.accept() 的什么位置？

Where exactly does a thread hang in a ServerSocket.accept() during waiting for a connection?

java

serversocket