Question

我尝试使用Andrey Semashev的Boost.log库

我在使用设置文件进行多线程日志记录时遇到了一些问题。

主程序代码：

namespace logging = boost::log;
namespace attrs = boost::log::attributes;
namespace src = boost::log::sources;
using boost::shared_ptr;

// Here we define our application severity levels.
enum severity_level
{
    normal,
    notification,
    warning,
    error,
    critical
};

BOOST_LOG_DECLARE_GLOBAL_LOGGER(test_lg, src::severity_logger_mt<>)

void try_logging( std::string c )
{
    BOOST_LOG_SCOPED_THREAD_TAG("Tag", std::string, c.c_str());

    src::severity_logger_mt<>& lg = get_test_lg();
    BOOST_LOG_SEV(lg, normal) << "This is a normal severity record";
    BOOST_LOG_SEV(lg, notification) << "This is a notification severity record";
    BOOST_LOG_SEV(lg, warning) << "This is a warning severity record";
    BOOST_LOG_SEV(lg, error) << "This is a error severity record";
    BOOST_LOG_SEV(lg, critical) << "This is a critical severity record";
}

int main(int argc, char* argv[])
{
    try
    {
        // Open the file
        std::ifstream settings("settings.txt");
        if (!settings.is_open())
        {
            std::cout << "Could not open settings.txt file" << std::endl;
            return 1;
        }

        // Read the settings and initialize logging library
        logging::init_from_stream(settings);

        shared_ptr< logging::attribute > attr(new attrs::local_clock);
        logging::core::get()->add_global_attribute("TimeStamp", attr);

        boost::thread_group g;
        for (char i = 'a'; i < 'z'; i++)
            g.create_thread(boost::bind(&try_logging, std::string("aaa") + i));

        g.join_all();
        system("PAUSE");
        return 0;
    }
    catch (std::exception& e)
    {
        std::cout << "FAILURE: " << e.what() << std::endl;
        return 1;
    }
}

设置文件：

[Core]

Filter="%Severity% >= 2"

[Sink:2]

Destination=TextFile
FileName=test.log
AutoFlush=true
Format="[%TimeStamp%] %Tag% %_%"
Asynchronous=1
Filter="%Tag% = aaab"

[Sink:3]
Filter="%Tag% = aaaa"
Asynchronous=1
Destination=TextFile
FileName=test.log
AutoFlush=true
Format="%Tag% %_%"

如你所见，我设置过滤：我想输出来自aaab，aaaa线程的消息。

但是结果文件很糟糕：

[2011-Jul-18 11:32:58.078192] aaab This aaaa This is a error severity [2011-Juaaaa This is a critical severity record
r severity record
[2011-Jul-18 11:32:58.437581] aaab This is a critical severity record

一条消息覆盖其他消息！据我所知 - 多线程之间没有同步。

如果我删除过滤 - 结果都是严格的。

我如何解决它？如果可能 - 使用配置文件，而不是代码。

谢谢。

Answer 1

我建议您将其更改为Singleton类，但我看到您不希望更改代码，因此我建议您使用以下内容：

http://boost-log.sourceforge.net/libs/log/doc/html/log/detailed/attributes.html

检查“可变常数”项，它可以帮助您找到解决您的写作问题的方法。

Boost.log同步问题

1 个答案: