CODEWITHSUNDEEP
c++multithreadingloggingboost
Kirill
Kirill

Reputation: 3

Set thread name for boost logger

I'm trying to set readable name to thread for the Boost logger instead of hex thread id. Here is how it looks now:

sink->set_formatter(
boost::log::expressions::stream << std::setw(5) << 
boost::log::expressions::attr <unsigned int>("LineID")
<< " [" << boost::log::expressions::format_date_time <boost::posix_time::ptime>("TimeStamp", "%H:%M:%S.%f")
<< "] <" << boost::log::expressions::attr <Severity_Level>("Severity") 
<< "> (" << boost::log::expressions::attr <boost::log::attributes::current_thread_id::value_type> ("ThreadID")
<< ") " << boost::log::expressions::smessage);

My first thought was to make a map container or to use pthread_setname_np somehow. But the problem is how to insert this into boost logging structure. Is there any way to do this properly?

Upvotes: 0

Views: 1655

Answers (1)

Andrey Semashev
Andrey Semashev

Reputation: 10614

You can add a thread-specific attribute with the thread name.

BOOST_LOG_ATTRIBUTE_KEYWORD(a_thread_name, "ThreadName", std::string)

void thread_entry()
{
    boost::log::core::get()->add_thread_attribute("ThreadName",
        boost::log::attributes::constant< std::string >("My thread name"));

    // Your thread logic follows
}

This is typically done in your thread startup function.

You can use this attribute in filters and formatters the same way as any other attribute. For example:

sink->set_formatter(
    boost::log::expressions::stream << std::setw(5) << 
    boost::log::expressions::attr <unsigned int>("LineID")
    << " [" << boost::log::expressions::format_date_time <boost::posix_time::ptime>("TimeStamp", "%H:%M:%S.%f")
    << "] <" << boost::log::expressions::attr <Severity_Level>("Severity") 
    << "> (" << boost::log::expressions::attr <boost::log::attributes::current_thread_id::value_type> ("ThreadID")
    << ", " << a_thread_name
    << ") " << boost::log::expressions::smessage);

You can learn more about thread-specific attributes, attribute keywords and constant attribute from the docs.

Upvotes: 1

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