glib VS SQLite

The question doesn't specify any language, so FWIW, I first learned "serious" programming by reading the sources for GNOME Glib, about 18 years ago.

https://gitlab.gnome.org/GNOME/glib

The next adventure is called Vala. It is like a C#-like language that compiles down to C but it includes GLib (which is GNOME low level wrappers around C API). It looks like it was half abandoned but then gained again some contributors.

It looks like you're using deprecated APIs, so you may need to link an older version of glib, <= 2.30. You'll notice in 2.32 there is no mention of GStaticMutex or GSystemThread

Source code: https://github.com/GNOME/glib/releases/tag/2.70.3

As valac just generates C from your Vala code, it won´t be a bug in the valac compiler. According to you code, it could be a bug in double.parse() or in double.to_str(). Both of these are part of GLib. Please make sure which of the methods is causing the bug before filing it.

Curious for some details. On what layer does that caching occur?

I immediately thought g_malloc but it seems to call directly to libc: https://github.com/GNOME/glib/blob/master/glib/gmem.c

If you are into alternative storage engines for SQLite, there is also an LSM (Log-Structured Merge-tree) extension in the main repository that is not announced nor documented but seems to work. It’s based on the SQLite 4 project.

https://github.com/sqlite/sqlite/tree/master/ext/lsm1

https://www.charlesleifer.com/blog/lsm-key-value-storage-in-...

The sqlite code base is really well done. Lots of documentation.

https://github.com/sqlite/sqlite

Especially the VM part: https://github.com/spandanb/learndb-py/blob/master/learndb/v...

Compare it with this: https://github.com/sqlite/sqlite/blob/master/src/vdbe.c

That's said, I'm curious how complete this LearnDB is. SQLite is hard to read not only it's old but also it covers a lot of SQL and following SQL spec makes hings complicated. SQLite has great test suite so it's nice if you run the suit against this implementation.

Correct, see the github mirror[1]. I don't know how well supported that feature is compared to main branch. If it was completely stable, then it would have already landed in the main stable branch. Clarity about the roadmap of that branch would be nice.

1. https://github.com/sqlite/sqlite/tree/begin-concurrent

Including comprehensive comments, documentation and tests in a codebase takes time and effort.

Failing to do so creates code that is very difficult to maintain or for someone new to the codebase to understand.

However, time and effort may not be what the organization wants to pay for, and individuals may view their own incomprehensible code as something like job security, as they can't be replaced by someone else easily.

As an example of complicated code that's still well-documented, the open-source sqlite code is a good example, about 1/4 of the B-tree file is comments, every time a variable is defined there's a short note explaining what it's used for, every function has a comment header that's comprehensive, such that someone new to the codebase could construct a map of how it all works fairly quickly. It's a good model for how to avoid the problem:

https://github.com/sqlite/sqlite/blob/master/src/btree.c