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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_
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