dart/runtime/vm/thread.h

// Copyright (c) 2015, 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_H_
#define VM_THREAD_H_

#include "vm/base_isolate.h"
#include "vm/globals.h"
#include "vm/os_thread.h"

namespace dart {

class CHA;
class Isolate;

// A VM thread; may be executing Dart code or performing helper tasks like
// garbage collection or compilation.
class Thread {
 public:
  explicit Thread(Isolate* isolate)
      : isolate_(isolate),
        cha_(NULL) {}

  static void InitOnce();

  static Thread* Current() {
    return reinterpret_cast<Thread*>(OSThread::GetThreadLocal(thread_key));
  }
  static void SetCurrent(Thread* current);

  // The topmost zone used for allocation in this thread.
  Zone* zone() {
    return reinterpret_cast<BaseIsolate*>(isolate())->current_zone();
  }

  // The isolate that this thread is operating on, or NULL if none.
  Isolate* isolate() const { return isolate_; }

  // The (topmost) CHA for the compilation in this thread.
  CHA* cha() const { return cha_; }
  void set_cha(CHA* value) { cha_ = value; }

 private:
  static ThreadLocalKey thread_key;

  Isolate* isolate_;
  CHA* cha_;

  DISALLOW_COPY_AND_ASSIGN(Thread);
};

}  // namespace dart

#endif  // VM_THREAD_H_