Need to synchronize Socket.send()?

[Max Kaufmann]

Consider this threaded socket server:

import std.stdio;
import std.string;
import std.socket;
import std.thread;

void main() {
	char[] ip = "127.0.0.1";
	int port = 12345;
	WorkerThread[] threads = [];
	writefln("Listening on "~ip~":"~toString(port));
	InternetAddress addr = new InternetAddress(ip,port);
	Socket sock = new TcpSocket();
	scope(exit) sock.close();
	sock.bind(addr);
	sock.listen(1);
	while(1) {
		WorkerThread worker = new WorkerThread(sock.accept());
		worker.start();
	}
}

class WorkerThread : Thread {
	private:
		Socket conn;
	public:
		this(Socket conn) {
			super();
			this.conn = conn;
			writefln("Spawning New Thread.");
		}

		int run() {
			byte[] bytesToSend = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
			conn.send(bytesToSend);
			return 0;
		}
}

Is Socket.send() synchronized, or do I need to synchronize it myself?