The second post in a little mini-series on new APIs in the GLib 2.62 series, this one’s about Christian Hergert’s
This is a new helper function for inserting elements at arbitrary positions in a queue, without needing to allocate a new container element for them. Previously, using
g_queue_insert_before(), a new
GList container would have been allocated. The new function means that elements can be moved from one position in a queue to another, without any allocations; and statically allocated
GList elements can be used in a
The new function comes with friends, too:
g_list_insert_before_link(). They behave similarly.
One example of using the new function would be to bump the priority of an element in the middle of a queue:
GList *element_to_bump = g_queue_find (queue, important_data);
GList *old_sibling = element_to_bump->prev;
if (old_sibling != NULL)
g_queue_unlink (queue, element_to_bump);
g_queue_insert_before_link (queue, old_sibling, element_to_bump);
g_debug ("Already at the head of the queue");
Christian is using it in GNOME Builder to arrange embedded structures in a queue using embedded
GList instances, kernel-style.
It’s been a long time since I’ve blogged, so I thought I’d do a quick series on new APIs in the upcoming 2.62 release series of GLib.
Today, it’s the
g_clear_signal_handler() function added by Marco Trevisan. This is a simple helper function along the same lines as
g_clear_handle_id(). Given a GObject and a signal handler ID, it disconnects the signal handler and clears the signal handler ID variable to zero.
This turns the following standard pattern of code:
if (obj != NULL && handler_id != 0)
g_signal_handler_disconnect (obj, handler_id);
handler_id = 0;
g_clear_signal_handler (&handler_id, obj);
Nothing earth-shattering, but it does allow code to become a little more compact.
GUADEC this year was another good one; thank you to the organisers for putting on a great and welcoming conference, and to Endless for sending me.
Unfortunately I couldn’t make the first two days due to a prior commitment, but I arrived on the Sunday in time to give my talks. I’ve got a lot of catching up to do with the talks on Friday and Saturday — looking forward to seeing the recordings online!
The slides for my talk on the state of GLib are here and the notes are here (source for them is here). I think the talk went fairly well, although I imagine it was quite boring for most involved — I’m not sure how to make new APIs particularly interesting to listen to!
The slides for my talk on download management on metered connections (the ‘Mogwai’ project) are here and the notes are here (source for them is here). I think this talk also went fairly well, and I’m pleased by how many people turned up and asked insightful questions. As I said in the talk, my time to spend on this project is currently limited, but I am interested in mentoring new contributors on it. Get in touch if you’re interested.
During the birds of a feather days, I spent most of my time on GLib, clearing out old bugs. We had the GLib BoF during the GTK+ one on Monday. The notes are here. Emmanuele has already done a good writeup of the results of the BoF here; and Matthias has written up the GTK+ BoF itself here.
There were some good discussions over dinner during the BoF days about people’s niggles with GLib, which has set a few ideas in motion in my head which I will try and explore over the coming few months, once the 2.58 release is out of the way.
It was good to catch up with everyone, great to see Almería and sample its food and drink, and nice to finally meet some of my colleagues from Endless for the first time!
I’ll be at GUADEC in Almería this year, giving two talks on Sunday:
- GLib: What’s new and what’s next?, which will be a general overview of recent developments in the GNOME utility library, some future plans, and some stats about what happens to contribution rates when you move to GitLab and Meson.
- Download management on metered connections, which will be an overview of the Mogwai project, which I’ve worked on in recent months at Endless. Mogwai is a download scheduler, which your code can use to determine the best time to do a big download to avoid incurring bandwidth charges from your internet provider (if you’re on a metered connection).
I won’t be arriving until Sunday morning, but will be around until Thursday (12th) morning, and will be in the GTK+/GLib BoF on Monday in room 2 to plot the next GLib release.
Shout out to my coworker Matthew Leeds’ talk, on P2P Distribution of Flatpaks and OSTrees, which comes towards the culmination of a lot of work by him (and others in Endless, and upstream OSTree and flatpak) to introduce peer to peer support in OSTree and flatpak, so you can distribute OSs and apps using USB sticks and the LAN.
tl;dr: Use gss_service_hold() and gss_service_release() from libgsystemservice.
Automatically shutting down daemons when not in use is in vogue, and a good way of saving resources quite easily (if the service’s startup/shutdown costs are low).
libgsystemservice can do this for you automatically, if your code is based on GssService, or if you want to port over to it (which should be fairly straightforward for simple services). It supports inactivity timeouts by default; just call gss_service_hold() when you start doing some activity, and gss_service_release() when you stop.
(Also, look, it’s neat that you can generate documentation and automatically publish it from your master branch using GitLab CI!)
Thanks to the work of Christoph Reiter, GLib has had continuous integration builds on Windows (using MinGW32/MSYS2) for a week or two now. Furthermore, he’s added code coverage support, so we can easily see how our code coverage is changing over time. Thanks Christoph!
Having written a few D-Bus system services recently, it felt like I was cargo-culting the same bits of code in all of them. I’ve split some of that out into a new library, libgsystemservice, which I hope will grow to contain all the bits people need to write D-Bus system services and other system daemons.
At the moment, it includes a way to load configuration files from multiple directories (with /etc taking priority over /usr/share, for example); tracking of D-Bus peers which have interacted with your service, and their credentials; and an equivalent of GApplication for system services. (GApplication only works on the session bus, and has various features targetting user applications which aren’t appropriate for system services.)
We’re using this code within Endless at the moment; but the more users it has, the better. Feedback and contributions are very welcome on GNOME’s GitLab.
Last Thursday and Friday was the GTK+ hackfest in Brussels. Matthias and Timm have blogged about GTK+ discussions already. This post is about the GLib side of things.
Firstly, we’re moving to Meson, but with no regressions from autotools. The plan is to target functional compatibility with autotools for 2.58, to keep both build systems in parallel for a release or two, and then drop autotools as soon as we can be satisfied there are no regressions for any of our features or supported platforms. I’d like to encourage distributions and developers to start trying to build GLib with Meson, seeing what breaks, and filing bugs.
Secondly, we’re migrating to gitlab, slowly. The first step is to migrate from cgit to gitlab, which will allow us to set up continuous integration for GLib. This will be a big win. The second step will be to migrate Bugzilla to gitlab. That’s going to take a bit longer, since there are issues with getting the data out of Bugzilla efficiently. All open bugs will be transferred, just like with the other gitlab transitions so far.
The maintainership status of GLib was also discussed. We are short on people power, and would appreciate assistance. If your project or company relies on GLib, please consider helping out with patch review or writing patches. We have three part-time maintainers who can provide guidance and help. We’re particularly interested in finding people to help maintain the platform ports of GLib, like Windows, OS X or BSD, more officially. Find us in #gtk+ on irc.gnome.org.
We also discussed a number of other, smaller features and issues, which might get handled for 2.58 depending on time. If you would like to work on any of them, please do! We can provide guidance and patch review in Bugzilla.
Thanks to Matthias and Emmanuele for organising the hackfest, Allison for turning up and imparting sage GLib wisdom, and Purism for kindly sponsoring dinner on Friday night.
Courtesy of my employer, Endless (we’re hiring), I’m at the GTK+ hackfest in Brussels, which is acting as my warm up for FOSDEM 2018. I’m representing the assorted GLib maintainers, aiming to look at the roadmap for GLib 2.58, and what we need to do to finish off GLib 2.56. If you’ve got suggestions for new features or changes to GLib, get in touch or file a bug!
tl;dr: G_DEBUG=fatal-warnings gdb ./my-program
If you have some code which uses GLib, and it emits a critical warning, for example if a g_return_if_fail() check fails or if a g_warning() message is emitted, how do you track it down and debug it?
Run your code under gdb with G_DEBUG=fatal-warnings (for g_return_if_fail() and g_warning()) or G_DEBUG=fatal-criticals (for g_return_if_fail()), and gdb will break execution when the failing precondition or warning is reached. If there are multiple warnings and you want to skip through to get to a particular one, just use the continue command in gdb until you reach the one you want.