JavaScript

Wait for a Socket to Become Writable

Demonstrates Socket.SelectForWriting, which waits for the socket, or sockets in a socket set, to become writable. It returns 1 if writable, 0 on timeout, or -1 on error.

Background. A timeoutMs of 0 performs a nonblocking poll. This is useful before attempting to send when the peer may be applying flow control.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

JavaScript

var success = false;

var socket = new CkSocket();

//  Connect to the server using TLS.
var bTls = true;
var maxWaitMs = 5000;
success = socket.Connect("example.com",5000,bTls,maxWaitMs);
if (success == false) {
    console.log(socket.LastErrorText);
    return;
}

//  Wait up to 5 seconds for the socket (or sockets in a socket set) to become writable.  Returns 1 if
//  writable, 0 on timeout, or -1 on error.
var ready = socket.SelectForWriting(5000);
if (ready < 0) {
    console.log(socket.LastErrorText);
    return;
}

if (ready !== 1) {
    console.log("The socket did not become writable before the timeout.");
    return;
}

console.log("The socket is ready for writing.");