Merge services into a shared IOService in dart:io, and use a native port.

runtime/bin/native_service.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/native_service.h"
-
-#include "platform/globals.h"
-#include "bin/thread.h"
-
-
-namespace dart {
-namespace bin {
-
-NativeService::NativeService(const char* name,
-                             Dart_NativeMessageHandler handler,
-                             int number_of_ports)
-    : name_(name),
-      handler_(handler),
-      service_ports_size_(number_of_ports),
-      service_ports_index_(0) {
-  service_ports_ = new Dart_Port[service_ports_size_];
-  for (int i = 0; i < service_ports_size_; i++) {
-    service_ports_[i] = ILLEGAL_PORT;
-  }
-}
-
-
-NativeService::~NativeService() {
-  delete[] service_ports_;
-}
-
-
-Dart_Port NativeService::GetServicePort() {
-  MutexLocker lock(&mutex_);
-  Dart_Port result = service_ports_[service_ports_index_];
-  if (result == ILLEGAL_PORT) {
-    result = Dart_NewNativePort(name_, handler_, true);
-    ASSERT(result != ILLEGAL_PORT);
-    service_ports_[service_ports_index_] = result;
-  }
-  service_ports_index_ = (service_ports_index_ + 1) % service_ports_size_;
-  return result;
-}
-
-}  // namespace bin
-}  // namespace dart