Start accepting incoming sockets earlier on Windows, to associate a at AcceptEx error to 'ServerSoc…

runtime/bin/socket.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/io_buffer.h"
 #include "bin/isolate_data.h"
 #include "bin/socket.h"
 #include "bin/dartutils.h"
 #include "bin/thread.h"
 #include "bin/utils.h"
@@ skipping 360 matching lines @@
       0,
       65535);
   int64_t backlog = DartUtils::GetInt64ValueCheckRange(
       Dart_GetNativeArgument(args, 3),
       0,
       65535);
   bool v6_only = DartUtils::GetBooleanValue(Dart_GetNativeArgument(args, 4));
   intptr_t socket = ServerSocket::CreateBindListen(
       addr, port, backlog, v6_only);
   OSError error;
-  if (socket >= 0) {
+  if (socket >= 0 && ServerSocket::StartAccept(socket)) {
     Socket::SetSocketIdNativeField(Dart_GetNativeArgument(args, 0), socket);
     Dart_SetReturnValue(args, Dart_True());
   } else {
     if (socket == -5) {
       OSError os_error(-1, "Invalid host", OSError::kUnknown);
       Dart_SetReturnValue(args, DartUtils::NewDartOSError(&os_error));
     } else {
       Dart_SetReturnValue(args, DartUtils::NewDartOSError(&error));
     }
   }
@@ skipping 295 matching lines @@
 intptr_t Socket::GetSocketIdNativeField(Dart_Handle socket_obj) {
   intptr_t socket = 0;
   Dart_Handle err =
       Dart_GetNativeInstanceField(socket_obj, kSocketIdNativeField, &socket);
   if (Dart_IsError(err)) Dart_PropagateError(err);
   return socket;
 }
 
 }  // namespace bin
 }  // namespace dart