michael@0: // Copyright (c) 2012 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #include "base/threading/thread_id_name_manager.h"
michael@0: 
michael@0: #include <stdlib.h>
michael@0: #include <string.h>
michael@0: 
michael@0: #include "base/logging.h"
michael@0: #include "base/memory/singleton.h"
michael@0: #include "base/strings/string_util.h"
michael@0: 
michael@0: namespace base {
michael@0: namespace {
michael@0: 
michael@0: static const char kDefaultName[] = "";
michael@0: static std::string* g_default_name;
michael@0: 
michael@0: }
michael@0: 
michael@0: ThreadIdNameManager::ThreadIdNameManager()
michael@0:     : main_process_name_(NULL),
michael@0:       main_process_id_(kInvalidThreadId) {
michael@0:   g_default_name = new std::string(kDefaultName);
michael@0: 
michael@0:   AutoLock locked(lock_);
michael@0:   name_to_interned_name_[kDefaultName] = g_default_name;
michael@0: }
michael@0: 
michael@0: ThreadIdNameManager::~ThreadIdNameManager() {
michael@0: }
michael@0: 
michael@0: ThreadIdNameManager* ThreadIdNameManager::GetInstance() {
michael@0:   return Singleton<ThreadIdNameManager,
michael@0:       LeakySingletonTraits<ThreadIdNameManager> >::get();
michael@0: }
michael@0: 
michael@0: const char* ThreadIdNameManager::GetDefaultInternedString() {
michael@0:   return g_default_name->c_str();
michael@0: }
michael@0: 
michael@0: void ThreadIdNameManager::RegisterThread(PlatformThreadHandle::Handle handle,
michael@0:                                          PlatformThreadId id) {
michael@0:   AutoLock locked(lock_);
michael@0:   thread_id_to_handle_[id] = handle;
michael@0:   thread_handle_to_interned_name_[handle] =
michael@0:       name_to_interned_name_[kDefaultName];
michael@0: }
michael@0: 
michael@0: void ThreadIdNameManager::SetName(PlatformThreadId id, const char* name) {
michael@0:   std::string str_name(name);
michael@0: 
michael@0:   AutoLock locked(lock_);
michael@0:   NameToInternedNameMap::iterator iter = name_to_interned_name_.find(str_name);
michael@0:   std::string* leaked_str = NULL;
michael@0:   if (iter != name_to_interned_name_.end()) {
michael@0:     leaked_str = iter->second;
michael@0:   } else {
michael@0:     leaked_str = new std::string(str_name);
michael@0:     name_to_interned_name_[str_name] = leaked_str;
michael@0:   }
michael@0: 
michael@0:   ThreadIdToHandleMap::iterator id_to_handle_iter =
michael@0:       thread_id_to_handle_.find(id);
michael@0: 
michael@0:   // The main thread of a process will not be created as a Thread object which
michael@0:   // means there is no PlatformThreadHandler registered.
michael@0:   if (id_to_handle_iter == thread_id_to_handle_.end()) {
michael@0:     main_process_name_ = leaked_str;
michael@0:     main_process_id_ = id;
michael@0:     return;
michael@0:   }
michael@0:   thread_handle_to_interned_name_[id_to_handle_iter->second] = leaked_str;
michael@0: }
michael@0: 
michael@0: const char* ThreadIdNameManager::GetName(PlatformThreadId id) {
michael@0:   AutoLock locked(lock_);
michael@0: 
michael@0:   if (id == main_process_id_)
michael@0:     return main_process_name_->c_str();
michael@0: 
michael@0:   ThreadIdToHandleMap::iterator id_to_handle_iter =
michael@0:       thread_id_to_handle_.find(id);
michael@0:   if (id_to_handle_iter == thread_id_to_handle_.end())
michael@0:     return name_to_interned_name_[kDefaultName]->c_str();
michael@0: 
michael@0:   ThreadHandleToInternedNameMap::iterator handle_to_name_iter =
michael@0:       thread_handle_to_interned_name_.find(id_to_handle_iter->second);
michael@0:   return handle_to_name_iter->second->c_str();
michael@0: }
michael@0: 
michael@0: void ThreadIdNameManager::RemoveName(PlatformThreadHandle::Handle handle,
michael@0:                                      PlatformThreadId id) {
michael@0:   AutoLock locked(lock_);
michael@0:   ThreadHandleToInternedNameMap::iterator handle_to_name_iter =
michael@0:       thread_handle_to_interned_name_.find(handle);
michael@0: 
michael@0:   DCHECK(handle_to_name_iter != thread_handle_to_interned_name_.end());
michael@0:   thread_handle_to_interned_name_.erase(handle_to_name_iter);
michael@0: 
michael@0:   ThreadIdToHandleMap::iterator id_to_handle_iter =
michael@0:       thread_id_to_handle_.find(id);
michael@0:   DCHECK((id_to_handle_iter!= thread_id_to_handle_.end()));
michael@0:   // The given |id| may have been re-used by the system. Make sure the
michael@0:   // mapping points to the provided |handle| before removal.
michael@0:   if (id_to_handle_iter->second != handle)
michael@0:     return;
michael@0: 
michael@0:   thread_id_to_handle_.erase(id_to_handle_iter);
michael@0: }
michael@0: 
michael@0: }  // namespace base