Move Mutex and Monitor from vm/ to platform/

runtime/vm/thread_macos.h

-// Copyright (c) 2011, 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.
-
-#ifndef VM_THREAD_MACOS_H_
-#define VM_THREAD_MACOS_H_
-
-#include <pthread.h>
-
-#include "vm/globals.h"
-
-namespace dart {
-
-class ThreadData {
- private:
-  ThreadData() {}
-  ~ThreadData() {}
-
-  pthread_t* tid() { return &tid_; }
-
-  pthread_t tid_;
-
-  friend class Thread;
-
-  DISALLOW_ALLOCATION();
-  DISALLOW_COPY_AND_ASSIGN(ThreadData);
-};
-
-
-class MutexData {
- private:
-  MutexData() {}
-  ~MutexData() {}
-
-  pthread_mutex_t* mutex() { return &mutex_; }
-
-  pthread_mutex_t mutex_;
-
-  friend class Mutex;
-
-  DISALLOW_ALLOCATION();
-  DISALLOW_COPY_AND_ASSIGN(MutexData);
-};
-
-
-class MonitorData {
- private:
-  MonitorData() {}
-  ~MonitorData() {}
-
-  pthread_mutex_t* mutex() { return &mutex_; }
-  pthread_cond_t* cond() { return &cond_; }
-
-  pthread_mutex_t mutex_;
-  pthread_cond_t cond_;
-
-  friend class Monitor;
-
-  DISALLOW_ALLOCATION();
-  DISALLOW_COPY_AND_ASSIGN(MonitorData);
-};
-
-}  // namespace dart
-
-#endif  // VM_THREAD_MACOS_H_