| // Copyright 2015 The Crashpad Authors. All rights reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "util/thread/thread_log_messages.h" |
| |
| #include <sys/types.h> |
| |
| #include "base/logging.h" |
| #include "base/threading/thread_local_storage.h" |
| |
| namespace crashpad { |
| |
| namespace { |
| |
| // While an object of this class exists, it will be set as the log message |
| // handler. A thread may register its thread-specific log message list to |
| // receive messages produced just on that thread. |
| // |
| // Only one object of this class may exist in the program at a time as created |
| // by GetInstance(). There must not be any log message handler in effect when it |
| // is created, and nothing else can be set as a log message handler while an |
| // object of this class exists. |
| class ThreadLogMessagesMaster { |
| public: |
| void SetThreadMessageList(std::vector<std::string>* message_list) { |
| DCHECK_EQ(logging::GetLogMessageHandler(), &LogMessageHandler); |
| DCHECK_NE(tls_.Get() != nullptr, message_list != nullptr); |
| tls_.Set(message_list); |
| } |
| |
| static ThreadLogMessagesMaster* GetInstance() { |
| static auto master = new ThreadLogMessagesMaster(); |
| return master; |
| } |
| |
| private: |
| ThreadLogMessagesMaster() { |
| DCHECK(!logging::GetLogMessageHandler()); |
| logging::SetLogMessageHandler(LogMessageHandler); |
| } |
| |
| ~ThreadLogMessagesMaster() = delete; |
| |
| static bool LogMessageHandler(logging::LogSeverity severity, |
| const char* file_path, |
| int line, |
| size_t message_start, |
| const std::string& string) { |
| std::vector<std::string>* log_messages = |
| reinterpret_cast<std::vector<std::string>*>(GetInstance()->tls_.Get()); |
| if (log_messages) { |
| log_messages->push_back(string); |
| } |
| |
| // Don’t consume the message. Allow it to be logged as if nothing was set as |
| // the log message handler. |
| return false; |
| } |
| |
| base::ThreadLocalStorage::Slot tls_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ThreadLogMessagesMaster); |
| }; |
| |
| } // namespace |
| |
| ThreadLogMessages::ThreadLogMessages() : log_messages_() { |
| ThreadLogMessagesMaster::GetInstance()->SetThreadMessageList(&log_messages_); |
| } |
| |
| ThreadLogMessages::~ThreadLogMessages() { |
| ThreadLogMessagesMaster::GetInstance()->SetThreadMessageList(nullptr); |
| } |
| |
| } // namespace crashpad |