ceph/src/boost/libs/log/example/multiple_threads/main.cpp

   1 /*
   2  *          Copyright Andrey Semashev 2007 - 2015.
   3  * Distributed under the Boost Software License, Version 1.0.
   4  *    (See accompanying file LICENSE_1_0.txt or copy at
   5  *          http://www.boost.org/LICENSE_1_0.txt)
   6  */
   7 /*!
   8  * \file   main.cpp
   9  * \author Andrey Semashev
  10  * \date   10.06.2008
  11  *
  12  * \brief  An example of logging in multiple threads.
  13  *         See the library tutorial for expanded comments on this code.
  14  *         It may also be worthwhile reading the Wiki requirements page:
  15  *         http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?Boost.Logging
  16  */
  17
  18 // #define BOOST_LOG_DYN_LINK 1
  19
  20 #include <stdexcept>
  21 #include <string>
  22 #include <iostream>
  23 #include <fstream>
  24 #include <boost/ref.hpp>
  25 #include <boost/bind.hpp>
  26 #include <boost/smart_ptr/shared_ptr.hpp>
  27 #include <boost/date_time/posix_time/posix_time.hpp>
  28 #include <boost/thread/thread.hpp>
  29 #include <boost/thread/barrier.hpp>
  30
  31 #include <boost/log/common.hpp>
  32 #include <boost/log/expressions.hpp>
  33 #include <boost/log/attributes.hpp>
  34 #include <boost/log/sinks.hpp>
  35 #include <boost/log/sources/logger.hpp>
  36
  37 namespace logging = boost::log;
  38 namespace attrs = boost::log::attributes;
  39 namespace src = boost::log::sources;
  40 namespace sinks = boost::log::sinks;
  41 namespace expr = boost::log::expressions;
  42 namespace keywords = boost::log::keywords;
  43
  44 using boost::shared_ptr;
  45
  46 enum
  47 {
  48     LOG_RECORDS_TO_WRITE = 10000,
  49     THREAD_COUNT = 2
  50 };
  51
  52 BOOST_LOG_INLINE_GLOBAL_LOGGER_DEFAULT(test_lg, src::logger_mt)
  53
  54 //! This function is executed in multiple threads
  55 void thread_fun(boost::barrier& bar)
  56 {
  57     // Wait until all threads are created
  58     bar.wait();
  59
  60     // Now, do some logging
  61     for (unsigned int i = 0; i < LOG_RECORDS_TO_WRITE; ++i)
  62     {
  63         BOOST_LOG(test_lg::get()) << "Log record " << i;
  64     }
  65 }
  66
  67 int main(int argc, char* argv[])
  68 {
  69     try
  70     {
  71         // Open a rotating text file
  72         shared_ptr< std::ostream > strm(new std::ofstream("test.log"));
  73         if (!strm->good())
  74             throw std::runtime_error("Failed to open a text log file");
  75
  76         // Create a text file sink
  77         shared_ptr< sinks::synchronous_sink< sinks::text_ostream_backend > > sink(
  78             new sinks::synchronous_sink< sinks::text_ostream_backend >);
  79
  80         sink->locked_backend()->add_stream(strm);
  81
  82         sink->set_formatter
  83         (
  84             expr::format("%1%: [%2%] [%3%] - %4%")
  85                 % expr::attr< unsigned int >("RecordID")
  86                 % expr::attr< boost::posix_time::ptime >("TimeStamp")
  87                 % expr::attr< attrs::current_thread_id::value_type >("ThreadID")
  88                 % expr::smessage
  89         );
  90
  91         // Add it to the core
  92         logging::core::get()->add_sink(sink);
  93
  94         // Add some attributes too
  95         logging::core::get()->add_global_attribute("TimeStamp", attrs::local_clock());
  96         logging::core::get()->add_global_attribute("RecordID", attrs::counter< unsigned int >());
  97         logging::core::get()->add_global_attribute("ThreadID", attrs::current_thread_id());
  98
  99         // Create logging threads
 100         boost::barrier bar(THREAD_COUNT);
 101         boost::thread_group threads;
 102         for (unsigned int i = 0; i < THREAD_COUNT; ++i)
 103             threads.create_thread(boost::bind(&thread_fun, boost::ref(bar)));
 104
 105         // Wait until all action ends
 106         threads.join_all();
 107
 108         return 0;
 109     }
 110     catch (std::exception& e)
 111     {
 112         std::cout << "FAILURE: " << e.what() << std::endl;
 113         return 1;
 114     }
 115 }