thread_id_name_manager.h

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// Copyright (c) 2012 The Chromium Authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file.

#ifndef BASE_THREADING_THREAD_ID_NAME_MANAGER_H_

#define BASE_THREADING_THREAD_ID_NAME_MANAGER_H_

#include <map>

#include <string>

#include <vector>

#include "base/base_export.h"

#include "base/callback.h"

#include "base/macros.h"

#include "base/observer_list.h"

#include "base/synchronization/lock.h"

#include "base/threading/platform_thread.h"

namespace base {

template <typename T>

struct DefaultSingletonTraits;

class BASE_EXPORT ThreadIdNameManager {

 public:

  static ThreadIdNameManager* GetInstance();

  static const char* GetDefaultInternedString();

  class BASE_EXPORT Observer {

   public:

    virtual ~Observer();

    // Called on the thread whose name is changing, immediately after the name

    // is set. |name| is a pointer to a C string that is guaranteed to remain

    // valid for the duration of the process.

//

    // NOTE: Will be called while ThreadIdNameManager's lock is held, so don't

    // call back into it.

    virtual void OnThreadNameChanged(const char* name) = 0;

};

  // Register the mapping between a thread |id| and |handle|.

  void RegisterThread(PlatformThreadHandle::Handle handle, PlatformThreadId id);

  void AddObserver(Observer*);

  void RemoveObserver(Observer*);

  // Set the name for the current thread.

  void SetName(const std::string& name);

  // Get the name for the given id.

  const char* GetName(PlatformThreadId id);

  // Unlike |GetName|, this method using TLS and avoids touching |lock_|.

  const char* GetNameForCurrentThread();

  // Remove the name for the given id.

  void RemoveName(PlatformThreadHandle::Handle handle, PlatformThreadId id);

 private:

  friend struct DefaultSingletonTraits<ThreadIdNameManager>;

  typedef std::map<PlatformThreadId, PlatformThreadHandle::Handle>

      ThreadIdToHandleMap;

  typedef std::map<PlatformThreadHandle::Handle, std::string*>

      ThreadHandleToInternedNameMap;

  typedef std::map<std::string, std::string*> NameToInternedNameMap;

  ThreadIdNameManager();

  ~ThreadIdNameManager();

  // lock_ protects the name_to_interned_name_, thread_id_to_handle_ and

  // thread_handle_to_interned_name_ maps.

  Lock lock_;

  NameToInternedNameMap name_to_interned_name_;

  ThreadIdToHandleMap thread_id_to_handle_;

  ThreadHandleToInternedNameMap thread_handle_to_interned_name_;

  // Treat the main process specially as there is no PlatformThreadHandle.

  std::string* main_process_name_;

  PlatformThreadId main_process_id_;

  // There's no point using a base::ObserverList behind a lock, so we just use

  // an std::vector instead.

  std::vector<Observer*> observers_;

  DISALLOW_COPY_AND_ASSIGN(ThreadIdNameManager);

};

}  // namespace base

#endif  // BASE_THREADING_THREAD_ID_NAME_MANAGER_H_