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, 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