Start of thread pool implementation

runtime/bin/thread_pool_macos.h

Index: runtime/bin/thread_pool_macos.h
diff --git a/runtime/bin/thread_pool_macos.h b/runtime/bin/thread_pool_macos.h
new file mode 100644
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+++ b/runtime/bin/thread_pool_macos.h
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+// Copyright (c) 2012, 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 BIN_THREAD_POOL_MACOS_H_
+#define BIN_THREAD_POOL_MACOS_H_
+
+#include <pthread.h>
+
+#include "vm/globals.h"
+
+
+class TaskQueueData {
+ private:
+  TaskQueueData() {}
+  ~TaskQueueData() {}
+
+  pthread_mutex_t* mutex() { return &mutex_; }
+  pthread_cond_t* cond() { return &cond_; }
+
+  pthread_mutex_t mutex_;
+  pthread_cond_t cond_;
+
+  friend class TaskQueue;
+
+  DISALLOW_ALLOCATION();
+  DISALLOW_COPY_AND_ASSIGN(TaskQueueData);
+};
+
+
+class ThreadPoolData {
+ private:
+  ThreadPoolData() {}
+  ~ThreadPoolData() {}
+
+  pthread_t* threads() { return threads_; }
+  void set_threads(pthread_t* threads) { threads_ = threads; }
+
+  pthread_t* threads_;
+
+  friend class ThreadPool;
+
+  DISALLOW_ALLOCATION();
+  DISALLOW_COPY_AND_ASSIGN(ThreadPoolData);
+};
+
+#endif  // BIN_THREAD_POOL_MACOS_H_