Upgrade evnet to fix close() bug. Add test for bug.

evnet wasn't properly closing sockets if they didn't have data to write.

deps/evnet/evnet.c

@@ -198,6 +198,7 @@ change_state_for_empty_out_stream (evnet_socket *socket)
 #else 
       socket->write_action = half_close;
 #endif
+      ev_io_start(SOCKET_LOOP_ &socket->write_watcher);
     }
   }
 }

test/mjsunit/test-tcp-pingpong-delay.js

@@ -0,0 +1,92 @@
+include("mjsunit.js");
+
+
+var tests_run = 0;
+
+function pingPongTest (port, host, on_complete) {
+  var N = 100;
+  var DELAY = 1;
+  var count = 0;
+  var client_closed = false;
+
+  var server = node.tcp.createServer(function (socket) {
+    socket.setEncoding("utf8");
+
+    socket.addListener("receive", function (data) {
+      puts(data);
+      assertEquals("PING", data);
+      assertEquals("open", socket.readyState);
+      assertTrue(count <= N);
+      setTimeout(function () {
+        assertEquals("open", socket.readyState);
+        socket.send("PONG");
+      }, DELAY);
+    });
+
+    socket.addListener("timeout", function () {
+      node.debug("server-side timeout!!");
+      assertFalse(true);
+    });
+
+    socket.addListener("eof", function () {
+      puts("server-side socket EOF");
+      assertEquals("writeOnly", socket.readyState);
+      socket.close();
+    });
+
+    socket.addListener("disconnect", function (had_error) {
+      puts("server-side socket disconnect");
+      assertFalse(had_error);
+      assertEquals("closed", socket.readyState);
+      socket.server.close();
+    });
+  });
+  server.listen(port, host);
+
+  var client = node.tcp.createConnection(port, host);
+
+  client.setEncoding("utf8");
+
+  client.addListener("connect", function () {
+    assertEquals("open", client.readyState);
+    client.send("PING");
+  });
+
+  client.addListener("receive", function (data) {
+    puts(data);
+    assertEquals("PONG", data);
+    assertEquals("open", client.readyState);
+
+    setTimeout(function () {
+      assertEquals("open", client.readyState);
+      if (count++ < N) {
+        client.send("PING");
+      } else {
+        puts("closing client");
+        client.close();
+        client_closed = true;
+      }
+    }, DELAY);
+  });
+
+  client.addListener("timeout", function () {
+    node.debug("client-side timeout!!");
+    assertFalse(true);
+  });
+
+  client.addListener("disconnect", function () {
+    puts("client disconnect");
+    assertEquals(N+1, count);
+    assertTrue(client_closed);
+    if (on_complete) on_complete();
+    tests_run += 1;
+  });
+}
+
+function onLoad () {
+  pingPongTest(21988);
+}
+
+function onExit () {
+  assertEquals(1, tests_run);
+}