base/threading/thread_id_name_manager.cc

   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,
  52                                   const std::string& name) {
  53   AutoLock locked(lock_);
  54   NameToInternedNameMap::iterator iter = name_to_interned_name_.find(name);
  55   std::string* leaked_str = NULL;
  56   if (iter != name_to_interned_name_.end()) {
  57     leaked_str = iter->second;
  58   } else {
  59     leaked_str = new std::string(name);
  60     name_to_interned_name_[name] = leaked_str;
  61   }
  62
  63   ThreadIdToHandleMap::iterator id_to_handle_iter =
  64       thread_id_to_handle_.find(id);
  65
  66   // The main thread of a process will not be created as a Thread object which
  67   // means there is no PlatformThreadHandler registered.
  68   if (id_to_handle_iter == thread_id_to_handle_.end()) {
  69     main_process_name_ = leaked_str;
  70     main_process_id_ = id;
  71     return;
  72   }
  73   thread_handle_to_interned_name_[id_to_handle_iter->second] = leaked_str;
  74 }
  75
  76 const char* ThreadIdNameManager::GetName(PlatformThreadId id) {
  77   AutoLock locked(lock_);
  78
  79   if (id == main_process_id_)
  80     return main_process_name_->c_str();
  81
  82   ThreadIdToHandleMap::iterator id_to_handle_iter =
  83       thread_id_to_handle_.find(id);
  84   if (id_to_handle_iter == thread_id_to_handle_.end())
  85     return name_to_interned_name_[kDefaultName]->c_str();
  86
  87   ThreadHandleToInternedNameMap::iterator handle_to_name_iter =
  88       thread_handle_to_interned_name_.find(id_to_handle_iter->second);
  89   return handle_to_name_iter->second->c_str();
  90 }
  91
  92 void ThreadIdNameManager::RemoveName(PlatformThreadHandle::Handle handle,
  93                                      PlatformThreadId id) {
  94   AutoLock locked(lock_);
  95   ThreadHandleToInternedNameMap::iterator handle_to_name_iter =
  96       thread_handle_to_interned_name_.find(handle);
  97
  98   DCHECK(handle_to_name_iter != thread_handle_to_interned_name_.end());
  99   thread_handle_to_interned_name_.erase(handle_to_name_iter);
 100
 101   ThreadIdToHandleMap::iterator id_to_handle_iter =
 102       thread_id_to_handle_.find(id);
 103   DCHECK((id_to_handle_iter!= thread_id_to_handle_.end()));
 104   // The given |id| may have been re-used by the system. Make sure the
 105   // mapping points to the provided |handle| before removal.
 106   if (id_to_handle_iter->second != handle)
 107     return;
 108
 109   thread_id_to_handle_.erase(id_to_handle_iter);
 110 }
 111
 112 }  // namespace base