Some time ago I did a data logger for fun, just to check if I could beat the performance
of an old C++ project of mine (mini-async-log) and to avoid letting my multithreading-C
skills rust when on a non-programming gig (using Yocto/OE, very little programming).
This project is a BSD licensed, producer-wait-free (when using thread-local storage) generic
message logger with high performance, decent test coverage, and type-safe C
strings (requires C11 or C++ compiler).
It was a shame to let this project to die unknown, as I think that it has
potential to be used on some niches as network programs, HFT, games, etc. so
here I am sharing it.
This was an evolution of a similar logger I did, this time I wanted to achieve wait-free
producers, so this implementation can use thread-local storage to achieve that. Some other
non allocation-free strategies are also available.
I still aimed for as easy as possible usage/learning curve and maintenance vs
lots of features.
It has some interesting things too:
-It has one modification on Djukov's MPMC queue to make it MPSC and accepting
variable (but limited) bucket size allocations (at the expense of unfairness
towards bigger buckets). There are more modifications/variations on this
Djukov queue on the library where I'm collecting all the generic stuff that I
use when developing C programs.
-The project still maintains automatic type detection of the string formatters
by using "clever" hardcore C preprocessor abuse mixed with C11 type-generic
expressions. It still accepts most non-type printf modifiers. This is at the
same time beautiful and ugly (you know what I mean), for the uglyness part,
automated testing is available.
NOTE: Untested on Windows.