The Tor Browser: security/sandbox/chromium/base/threading/thread_id_name

     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.

     5 #include "base/threading/thread_id_name_manager.h"

     7 #include <stdlib.h>

     8 #include <string.h>

    10 #include "base/logging.h"

    11 #include "base/memory/singleton.h"

    12 #include "base/strings/string_util.h"

    14 namespace base {

    15 namespace {

    17 static const char kDefaultName[] = "";

    18 static std::string* g_default_name;

    20 }

    22 ThreadIdNameManager::ThreadIdNameManager()

    23     : main_process_name_(NULL),

    24       main_process_id_(kInvalidThreadId) {

    25   g_default_name = new std::string(kDefaultName);

    27   AutoLock locked(lock_);

    28   name_to_interned_name_[kDefaultName] = g_default_name;

    29 }

    31 ThreadIdNameManager::~ThreadIdNameManager() {

    32 }

    34 ThreadIdNameManager* ThreadIdNameManager::GetInstance() {

    35   return Singleton<ThreadIdNameManager,

    36       LeakySingletonTraits<ThreadIdNameManager> >::get();

    37 }

    39 const char* ThreadIdNameManager::GetDefaultInternedString() {

    40   return g_default_name->c_str();

    41 }

    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 }

    51 void ThreadIdNameManager::SetName(PlatformThreadId id, const char* name) {

    52   std::string str_name(name);

    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   }

    64   ThreadIdToHandleMap::iterator id_to_handle_iter =

    65       thread_id_to_handle_.find(id);

    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 }

    77 const char* ThreadIdNameManager::GetName(PlatformThreadId id) {

    78   AutoLock locked(lock_);

    80   if (id == main_process_id_)

    81     return main_process_name_->c_str();

    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();

    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 }

    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);

    99   DCHECK(handle_to_name_iter != thread_handle_to_interned_name_.end());

   100   thread_handle_to_interned_name_.erase(handle_to_name_iter);

   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;

   110   thread_id_to_handle_.erase(id_to_handle_iter);

   111 }

   113 }  // namespace base

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