c++11日志练习

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使用c++11 写个日志类

主要练习 线程 互斥量的使用

代码如下:

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#include "stdafx.h" #include "Logger.h" #include <fstream> #include <iostream>   Logger::Logger(const string& filepath): filePath_(filepath) {   }   Logger::~Logger() {           thread_.join(); }   bool Logger::init() {     bool bRet = false;     thread_ = thread{ &Logger::LogThreadFunc, this };     unique_lock<mutex> lock(mutexStarted_);     condVarStarted_.wait(lock);       bRet = true;     return bRet; }   void Logger::Log(const std::string& content) {     unique_lock<mutex> lock(mutex_);     queue_.push(content);   }     void Logger::LogThreadFunc() {     ofstream ofs(filePath_);     if (ofs.fail()) {         cerr << "Failed to open logfile." << endl;         return;     }       cout << "enter thread" << endl;     unique_lock<mutex> lock(mutex_,std::defer_lock);     condVarStarted_.notify_all();       while (true){         lock.lock();         condVar_.wait(lock);         lock.unlock();           while (true){             lock.lock();             if (queue_.empty()) {                 lock.unlock();                 break;             }             else {                 ofs << queue_.front() << endl;                 queue_.pop();             }             lock.unlock();         }         if (bExit_){             break;         }     }     }

　　

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#ifndef LOGGER_H__ #define LOGGER_H__     #include <queue> #include <string> #include <thread> #include <mutex> #include <condition_variable>   #define DEFAULT_FILE_NAME   "test.dat"   using namespace std;   class Logger{ public:     Logger(const string& filepath = DEFAULT_FILE_NAME);     virtual ~Logger();     bool init();       void Log(const std::string& content);     void LogThreadFunc();     void SetExitFlag(){         bExit_ = true;         condVar_.notify_all();     }; private:     string filePath_;     bool bExit_;     std::condition_variable condVar_;     std::condition_variable condVarStarted_;     std::thread thread_;     std::mutex mutex_;     std::mutex mutexStarted_;     std::queue<std::string> queue_;     Logger& operator=(const Logger& rhs); };       #endif

　　测试代码如下:

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// 1111.cpp : 定义控制台应用程序的入口点。 //   #include "stdafx.h" #include "Logger.h" #include <iostream> #include <sstream> #include <thread> #include <vector>       void logSomeMessages(int id, Logger& logger) {     for (int i = 0; i < 100; ++i) {         stringstream ss;         ss << "Log test " << i << " from thread " << id;         logger.Log(ss.str());     } }   int _tmain(int argc, _TCHAR* argv[]) {     Logger log;     log.init();       vector<thread> threads;     // Create a few threads all working with the same Logger instance.     for (int i = 0; i < 100; ++i) {         threads.push_back(thread{ logSomeMessages, i, ref(log) });     }       for (auto& t : threads) {         t.join();     }       log.SetExitFlag();     return 0; }