Question

您好我有一个使用boost的日志类，在initLogging中我已经完成了这个：

// Create a backend
boost::shared_ptr< SinkTextFileBakend > sink = boost::log::add_file_log(
    sm_folderOfLogFiles + "optimisations_%Y-%m-%d_%H-%M-%S.%N.log",
    boost::log::keywords::format = boost::log::expressions::stream
        << boost::log::expressions::attr< boost::log::attributes::current_process_name::value_type >("Executable") << "("
        << boost::log::expressions::attr< boost::log::attributes::current_process_id::value_type >("ExeUID") << ") CID("
        << correlid << ") " << severity << "["
        << boost::log::expressions::format_date_time< boost::posix_time::ptime >("TimeStamp", "%Y-%m-%d %H:%M:%S.%f")
        << "] [" << boost::log::expressions::attr< boost::log::attributes::current_thread_id::value_type >("ThreadID")
        << "] " << classname << " - " << boost::log::expressions::smessage,
    boost::log::keywords::open_mode = (std::ios::out | std::ios::app),
    boost::log::keywords::rotation_size = 2 * 1024 * 1024,
    boost::log::keywords::auto_flush = true
);

sink->locked_backend()->set_open_handler(&openingHandler);

boost::log::core::get()->set_filter(severity >= SeverityLevels::info);
boost::log::core::get()->add_sink(sink);

// for logging in console, too
boost::shared_ptr< boost::log::sinks::text_ostream_backend > backend =
    boost::make_shared< boost::log::sinks::text_ostream_backend >();
backend->add_stream(
    boost::shared_ptr< std::ostream >(&std::cout));

// Enable auto-flushing after each log record written
backend->auto_flush(true);

// Wrap it into the frontend and register in the core.
// The backend requires synchronization in the frontend.
boost::shared_ptr< boost::log::sinks::synchronous_sink< boost::log::sinks::text_ostream_backend > > backend_sink(
    new boost::log::sinks::synchronous_sink< boost::log::sinks::text_ostream_backend >(backend)); // for testing and printing log in sysout

backend_sink->set_formatter(
    boost::log::expressions::stream
    // line id will be written in hex, 8-digits, zero-filled
    << boost::log::expressions::attr< boost::log::attributes::current_process_name::value_type >("Executable")
    << "(" << boost::log::expressions::attr< boost::log::attributes::current_process_name::value_type >("ExeUID")
    << ") CID(" << correlid << ") " << severity << " ["
    << boost::log::expressions::format_date_time< boost::posix_time::ptime >("TimeStamp", "%Y-%m-%d %H:%M:%S.%f")
    << "] [" << boost::log::expressions::attr< boost::log::attributes::current_thread_id::value_type >("ThreadID")
    << "] " << classname << " - " << boost::log::expressions::smessage);
boost::log::core::get()->add_sink(backend_sink); // for testing and printing log in sysout

所以我有2个后端，一个用于写入文件，另一个用于在控制台中打印。在执行结束时，我收到如下错误：

*** Error in `/home/sop/project/build/proj': double free or corruption (out): 0x00000000008caaa0 ***
*** Crashed with return code: 0 ***

（这在IDE：KDevelop中）或：

*** Error in `./proj': double free or corruption (out): 0x00000000008caaa0 ***
Aborted (core dumped)

（如果在终端中运行）

我已经完成了一些测试，如果我删除了部分日志记录到控制台，那么这个问题就会消失。如果它只有控制台日志记录的部分，似乎我得到了相同的错误，所以似乎所有问题都在那部分。我不明白我做错了什么，任何帮助，请将不胜感激。感谢

Answer 1

这一行存在问题：

backend->add_stream(
    boost::shared_ptr< std::ostream >(&std::cout));

std::cout是一个全局对象，无法使用operator delete删除，这在boost::shared_ptr被销毁时发生。您应该使用boost::null_deleter：

backend->add_stream(
    boost::shared_ptr< std::ostream >(&std::cout, boost::null_deleter()));

在处理完所有问题后，为什么会收到错误并导致代码崩溃？

1 个答案: