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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "base/threading/thread_id_name_manager.h"
      6 
      7 #include <stdlib.h>
      8 #include <string.h>
      9 
     10 #include "base/logging.h"
     11 #include "base/memory/singleton.h"
     12 #include "base/strings/string_util.h"
     13 
     14 namespace base {
     15 namespace {
     16 
     17 static const char kDefaultName[] = "";
     18 static std::string* g_default_name;
     19 
     20 }
     21 
     22 ThreadIdNameManager::ThreadIdNameManager()
     23     : main_process_name_(NULL),
     24       main_process_id_(kInvalidThreadId) {
     25   g_default_name = new std::string(kDefaultName);
     26 
     27   AutoLock locked(lock_);
     28   name_to_interned_name_[kDefaultName] = g_default_name;
     29 }
     30 
     31 ThreadIdNameManager::~ThreadIdNameManager() {
     32 }
     33 
     34 ThreadIdNameManager* ThreadIdNameManager::GetInstance() {
     35   return Singleton<ThreadIdNameManager,
     36       LeakySingletonTraits<ThreadIdNameManager> >::get();
     37 }
     38 
     39 const char* ThreadIdNameManager::GetDefaultInternedString() {
     40   return g_default_name->c_str();
     41 }
     42 
     43 void ThreadIdNameManager::RegisterThread(PlatformThreadHandle::Handle handle,
     44                                          PlatformThreadId id) {
     45   AutoLock locked(lock_);
     46   thread_id_to_handle_[id] = handle;
     47   thread_handle_to_interned_name_[handle] =
     48       name_to_interned_name_[kDefaultName];
     49 }
     50 
     51 void ThreadIdNameManager::SetName(PlatformThreadId id, const char* name) {
     52   std::string str_name(name);
     53 
     54   AutoLock locked(lock_);
     55   NameToInternedNameMap::iterator iter = name_to_interned_name_.find(str_name);
     56   std::string* leaked_str = NULL;
     57   if (iter != name_to_interned_name_.end()) {
     58     leaked_str = iter->second;
     59   } else {
     60     leaked_str = new std::string(str_name);
     61     name_to_interned_name_[str_name] = leaked_str;
     62   }
     63 
     64   ThreadIdToHandleMap::iterator id_to_handle_iter =
     65       thread_id_to_handle_.find(id);
     66 
     67   // The main thread of a process will not be created as a Thread object which
     68   // means there is no PlatformThreadHandler registered.
     69   if (id_to_handle_iter == thread_id_to_handle_.end()) {
     70     main_process_name_ = leaked_str;
     71     main_process_id_ = id;
     72     return;
     73   }
     74   thread_handle_to_interned_name_[id_to_handle_iter->second] = leaked_str;
     75 }
     76 
     77 const char* ThreadIdNameManager::GetName(PlatformThreadId id) {
     78   AutoLock locked(lock_);
     79 
     80   if (id == main_process_id_)
     81     return main_process_name_->c_str();
     82 
     83   ThreadIdToHandleMap::iterator id_to_handle_iter =
     84       thread_id_to_handle_.find(id);
     85   if (id_to_handle_iter == thread_id_to_handle_.end())
     86     return name_to_interned_name_[kDefaultName]->c_str();
     87 
     88   ThreadHandleToInternedNameMap::iterator handle_to_name_iter =
     89       thread_handle_to_interned_name_.find(id_to_handle_iter->second);
     90   return handle_to_name_iter->second->c_str();
     91 }
     92 
     93 void ThreadIdNameManager::RemoveName(PlatformThreadHandle::Handle handle,
     94                                      PlatformThreadId id) {
     95   AutoLock locked(lock_);
     96   ThreadHandleToInternedNameMap::iterator handle_to_name_iter =
     97       thread_handle_to_interned_name_.find(handle);
     98 
     99   DCHECK(handle_to_name_iter != thread_handle_to_interned_name_.end());
    100   thread_handle_to_interned_name_.erase(handle_to_name_iter);
    101 
    102   ThreadIdToHandleMap::iterator id_to_handle_iter =
    103       thread_id_to_handle_.find(id);
    104   DCHECK((id_to_handle_iter!= thread_id_to_handle_.end()));
    105   // The given |id| may have been re-used by the system. Make sure the
    106   // mapping points to the provided |handle| before removal.
    107   if (id_to_handle_iter->second != handle)
    108     return;
    109 
    110   thread_id_to_handle_.erase(id_to_handle_iter);
    111 }
    112 
    113 }  // namespace base
    114