Remove unused thread pool from standalone VM binary.

runtime/bin/thread_pool.h

-// 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_H_
-#define BIN_THREAD_POOL_H_
-
-#include "bin/builtin.h"
-#include "platform/globals.h"
-#include "platform/thread.h"
-
-class ThreadPool {
- public:
-  typedef void* Task;
-  typedef void (*TaskHandler)(Task args);
-
-  enum DrainFlag {
-    kDrain,
-    kDoNotDrain
-  };
-
-  ThreadPool(TaskHandler task_handler, int initial_number_of_threads = 4)
-      : initial_number_of_threads_(initial_number_of_threads),
-        terminate_(false),
-        drain_flag_(kDoNotDrain),
-        number_of_threads_(0),
-        head_(NULL),
-        tail_(NULL),
-        task_handler_(task_handler) {}
-
-  // Start the thread pool.
-  void Start();
-
-  // Shutdown the thread pool. The drain flags specifies whether all
-  // tasks pending in the queue will be processed. When this function
-  // returns all threads are terminated.
-  void Shutdown(DrainFlag drain_flag = kDoNotDrain);
-
-  // Insert a new task into the thread pool. Returns true on success.
-  bool InsertTask(Task task);
-
- private:
-  class TaskQueueEntry {
-   public:
-    explicit TaskQueueEntry(Task task) : task_(task), next_(NULL) {}
-
-    Task task() { return task_; }
-    TaskQueueEntry* next() { return next_; }
-    void set_next(TaskQueueEntry* value) { next_ = value; }
-
-   private:
-    Task task_;
-    TaskQueueEntry* next_;
-
-    DISALLOW_COPY_AND_ASSIGN(TaskQueueEntry);
-  };
-
-
-  TaskQueueEntry* WaitForTask();
-  void ThreadTerminated();
-
-  static void Main(uword args);
-
-  dart::Monitor monitor_;  // Monitor protecting all shared state.
-
-  int initial_number_of_threads_;  // Initial number of threads to start.
-  bool terminate_;  // Set to true when the thread pool is terminating.
-  DrainFlag drain_flag_;  // Queue handling before termination.
-  int number_of_threads_;  // Current number of threads.
-
-  // The task queue is a single linked list. Link direction is from tail
-  // to head. New entries are inserted at the tail and entries are
-  // removed from the head.
-  TaskQueueEntry* head_;
-  TaskQueueEntry* tail_;
-  TaskHandler task_handler_;
-
-  DISALLOW_COPY_AND_ASSIGN(ThreadPool);
-};
-
-#endif  // BIN_THREAD_POOL_H_