how is the thread name set in log4cplus?

Question

I'm evaluating log4cplus for a multi threaded C++ application on linux. The TTCCLayout and the PatternLayout allow the thread name to be displayed. In my tests there was never a name but just a meaningless number. I'm not using the thread class of log4cplus. How does log4cplus determine this thread name and is it possible to set it myself?

I guess it's not that easy. I had to dig through my thread library and successfully used prctl to set a name, but no effect. Even the test application in the log4cplus source does not show thread names. Maybe I should ask this on the log4cplus devel mailing list. — LeSpocky, May 14 '13 at 11:15
http://man7.org/linux/man-pages/man3/pthread_setname_np.3.html — Basile Starynkevitch, May 14 '13 at 11:29

score 2 · Accepted Answer · answered May 14 '13 at 11:34

2

Log4cplus (as of version 1.1.1 or earlier) does not have any PatternLayout formatter for thread names. It only has two thread related formatters:

%t - prints thread ID; for *nix, it is whatever value pthread_t represents, usually an int value or a pointer value
%T - prints alternative thread ID; for Linux, prints the value returned by syscall (SYS_gettid)

There is definitely some room for improvement.

answered May 14 '13 at 11:34

wilx

17,697
6
59
114

You're right and that's what I was told now [on the log4cplus mailing list](http://sourceforge.net/mailarchive/forum.php?thread_name=CAKw7uVhT9_xEac_svRUmtLuLqhW_yohzvRQXtQzt5rvSXC5VTw%40mail.gmail.com&forum_name=log4cplus-devel) as well. However there are NDC or MDC facilities I could use. I'll have another look in the log4cplus code for that. O:-) Thanks for your help. :-) – LeSpocky May 15 '13 at 11:45

how is the thread name set in log4cplus?

1 Answers1