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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.
- #include "base/threading/thread_id_name_manager.h"
- #include <stdlib.h>
- #include <string.h>
- #include "base/check.h"
- #include "base/containers/contains.h"
- #include "base/containers/cxx20_erase.h"
- #include "base/memory/singleton.h"
- #include "base/no_destructor.h"
- #include "base/strings/string_util.h"
- #include "base/threading/thread_local.h"
- #include "base/trace_event/heap_profiler_allocation_context_tracker.h" // no-presubmit-check
- namespace base {
- namespace {
- static const char kDefaultName[] = "";
- static std::string* g_default_name;
- ThreadLocalStorage::Slot& GetThreadNameTLS() {
- static base::NoDestructor<base::ThreadLocalStorage::Slot> thread_name_tls;
- return *thread_name_tls;
- }
- }
- ThreadIdNameManager::Observer::~Observer() = default;
- ThreadIdNameManager::ThreadIdNameManager()
- : main_process_name_(nullptr), main_process_id_(kInvalidThreadId) {
- g_default_name = new std::string(kDefaultName);
- AutoLock locked(lock_);
- name_to_interned_name_[kDefaultName] = g_default_name;
- }
- ThreadIdNameManager::~ThreadIdNameManager() = default;
- ThreadIdNameManager* ThreadIdNameManager::GetInstance() {
- return Singleton<ThreadIdNameManager,
- LeakySingletonTraits<ThreadIdNameManager> >::get();
- }
- const char* ThreadIdNameManager::GetDefaultInternedString() {
- return g_default_name->c_str();
- }
- void ThreadIdNameManager::RegisterThread(PlatformThreadHandle::Handle handle,
- PlatformThreadId id) {
- AutoLock locked(lock_);
- thread_id_to_handle_[id] = handle;
- thread_handle_to_interned_name_[handle] =
- name_to_interned_name_[kDefaultName];
- }
- void ThreadIdNameManager::AddObserver(Observer* obs) {
- AutoLock locked(lock_);
- DCHECK(!base::Contains(observers_, obs));
- observers_.push_back(obs);
- }
- void ThreadIdNameManager::RemoveObserver(Observer* obs) {
- AutoLock locked(lock_);
- DCHECK(base::Contains(observers_, obs));
- base::Erase(observers_, obs);
- }
- void ThreadIdNameManager::SetName(const std::string& name) {
- PlatformThreadId id = PlatformThread::CurrentId();
- std::string* leaked_str = nullptr;
- {
- AutoLock locked(lock_);
- auto iter = name_to_interned_name_.find(name);
- if (iter != name_to_interned_name_.end()) {
- leaked_str = iter->second;
- } else {
- leaked_str = new std::string(name);
- name_to_interned_name_[name] = leaked_str;
- }
- auto id_to_handle_iter = thread_id_to_handle_.find(id);
- GetThreadNameTLS().Set(const_cast<char*>(leaked_str->c_str()));
- for (Observer* obs : observers_)
- obs->OnThreadNameChanged(leaked_str->c_str());
- // The main thread of a process will not be created as a Thread object which
- // means there is no PlatformThreadHandler registered.
- if (id_to_handle_iter == thread_id_to_handle_.end()) {
- main_process_name_ = leaked_str;
- main_process_id_ = id;
- return;
- }
- thread_handle_to_interned_name_[id_to_handle_iter->second] = leaked_str;
- }
- // Add the leaked thread name to heap profiler context tracker. The name added
- // is valid for the lifetime of the process. AllocationContextTracker cannot
- // call GetName(which holds a lock) during the first allocation because it can
- // cause a deadlock when the first allocation happens in the
- // ThreadIdNameManager itself when holding the lock.
- trace_event::AllocationContextTracker::SetCurrentThreadName(
- leaked_str->c_str());
- }
- const char* ThreadIdNameManager::GetName(PlatformThreadId id) {
- AutoLock locked(lock_);
- if (id == main_process_id_)
- return main_process_name_->c_str();
- auto id_to_handle_iter = thread_id_to_handle_.find(id);
- if (id_to_handle_iter == thread_id_to_handle_.end())
- return name_to_interned_name_[kDefaultName]->c_str();
- auto handle_to_name_iter =
- thread_handle_to_interned_name_.find(id_to_handle_iter->second);
- return handle_to_name_iter->second->c_str();
- }
- const char* ThreadIdNameManager::GetNameForCurrentThread() {
- const char* name = reinterpret_cast<const char*>(GetThreadNameTLS().Get());
- return name ? name : kDefaultName;
- }
- void ThreadIdNameManager::RemoveName(PlatformThreadHandle::Handle handle,
- PlatformThreadId id) {
- AutoLock locked(lock_);
- auto handle_to_name_iter = thread_handle_to_interned_name_.find(handle);
- DCHECK(handle_to_name_iter != thread_handle_to_interned_name_.end());
- thread_handle_to_interned_name_.erase(handle_to_name_iter);
- auto id_to_handle_iter = thread_id_to_handle_.find(id);
- DCHECK((id_to_handle_iter!= thread_id_to_handle_.end()));
- // The given |id| may have been re-used by the system. Make sure the
- // mapping points to the provided |handle| before removal.
- if (id_to_handle_iter->second != handle)
- return;
- thread_id_to_handle_.erase(id_to_handle_iter);
- }
- std::vector<PlatformThreadId> ThreadIdNameManager::GetIds() {
- AutoLock locked(lock_);
- std::vector<PlatformThreadId> ids;
- ids.reserve(thread_id_to_handle_.size());
- for (const auto& iter : thread_id_to_handle_)
- ids.push_back(iter.first);
- return ids;
- }
- } // namespace base
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