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95 lines
2.8 KiB
C++
95 lines
2.8 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_THREADING_THREAD_ID_NAME_MANAGER_H_
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#define BASE_THREADING_THREAD_ID_NAME_MANAGER_H_
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#include <map>
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#include <string>
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#include <vector>
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#include "base/base_export.h"
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#include "base/callback.h"
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#include "base/macros.h"
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#include "base/observer_list.h"
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#include "base/synchronization/lock.h"
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#include "base/threading/platform_thread.h"
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namespace base {
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template <typename T>
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struct DefaultSingletonTraits;
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class BASE_EXPORT ThreadIdNameManager {
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public:
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static ThreadIdNameManager* GetInstance();
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static const char* GetDefaultInternedString();
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class BASE_EXPORT Observer {
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public:
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virtual ~Observer();
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// Called on the thread whose name is changing, immediately after the name
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// is set. |name| is a pointer to a C string that is guaranteed to remain
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// valid for the duration of the process.
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//
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// NOTE: Will be called while ThreadIdNameManager's lock is held, so don't
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// call back into it.
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virtual void OnThreadNameChanged(const char* name) = 0;
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};
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// Register the mapping between a thread |id| and |handle|.
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void RegisterThread(PlatformThreadHandle::Handle handle, PlatformThreadId id);
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void AddObserver(Observer*);
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void RemoveObserver(Observer*);
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// Set the name for the current thread.
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void SetName(const std::string& name);
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// Get the name for the given id.
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const char* GetName(PlatformThreadId id);
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// Unlike |GetName|, this method using TLS and avoids touching |lock_|.
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const char* GetNameForCurrentThread();
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// Remove the name for the given id.
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void RemoveName(PlatformThreadHandle::Handle handle, PlatformThreadId id);
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private:
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friend struct DefaultSingletonTraits<ThreadIdNameManager>;
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typedef std::map<PlatformThreadId, PlatformThreadHandle::Handle>
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ThreadIdToHandleMap;
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typedef std::map<PlatformThreadHandle::Handle, std::string*>
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ThreadHandleToInternedNameMap;
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typedef std::map<std::string, std::string*> NameToInternedNameMap;
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ThreadIdNameManager();
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~ThreadIdNameManager();
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// lock_ protects the name_to_interned_name_, thread_id_to_handle_ and
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// thread_handle_to_interned_name_ maps.
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Lock lock_;
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NameToInternedNameMap name_to_interned_name_;
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ThreadIdToHandleMap thread_id_to_handle_;
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ThreadHandleToInternedNameMap thread_handle_to_interned_name_;
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// Treat the main process specially as there is no PlatformThreadHandle.
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std::string* main_process_name_;
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PlatformThreadId main_process_id_;
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// There's no point using a base::ObserverList behind a lock, so we just use
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// an std::vector instead.
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std::vector<Observer*> observers_;
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DISALLOW_COPY_AND_ASSIGN(ThreadIdNameManager);
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};
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} // namespace base
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#endif // BASE_THREADING_THREAD_ID_NAME_MANAGER_H_
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