Category Archive: Qt

Jul 13

forkfd part 3: QProcess’s requirements and current solution

In the previous posts onmy series of blogs about starting and managing sub-processes on Unix, I talked about how it’s implemented and how the current solutions have limitations. On this post, I’ll show how QtCore has solved the problem (to the extent that it can be solved) and what requirements a new solution must fulfill. …

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Jul 13

forkfd part 2: Finding out that a child process exited on Unix

On my previous blog, I said that the solutions we’ve got implemented on Linux are a good start, but not the full solution. We can start a child process properly, but we still can’t properly find out when it exited.

Jul 13

forkfd part 1: Launching processes on Unix

Have you ever tried to launch a sub-process on Unix? POSIX.1 has several APIs for doing that, including: fork+execve and posix_spawn. Starting a child process is not difficult, but ensuring that they behave properly and you get notified when the child dies, that is difficult.

Jul 10

Continue using QPointer

Early in the Qt 5 development cycle, we had made the decision to deprecate QPointer and replace it with the more modern QWeakPointer. That decision is now reversed, so please continue using QPointer where you were using them. Moreover, don’t use QWeakPointer except in conjunction with QSharedPointer. To understand the reason behind this back and …

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Jun 13

AVX-optimised raster painting for Windows too

Yesterday, one of my contributions to Qt was merged which finally adds better support for optimised raster painting on Windows, with SSE2 and AVX instructions. This feature has long been present on the Unix systems, but it was somewhat lacking on Windows. If you’ve read my past blogs, you know I often talk about and …

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May 18

I’m going to Akademy and the Qt Contributor Summit

Just a quick post so I can say I’m going to both events: Akademy 2012 and the Qt Contributors Summit 2012. I hope to see many of you there, and we have a lot to discuss and work on.

May 11

Source code must be UTF-8 and QString wants it

I’ve talked about source code encoding in the past, arguing that the C++ language lacks a fundamental setting. However, since this Monday, Qt 5 now starts to enforce that source code must be UTF-8. In a way. The commit that landed on the qtbase repository finally changed the codec used by QString’s 8-bit methods to …

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Apr 30

Quick update to the Qt Project statistics

Update on last Friday’s post on the Qt Project’s statistics: the script ran again this morning, so we now have data for last week. The Qt Project Statistics Page now includes the number of contributors per week: Visit the statistics page for more graphs.

Apr 27

Qt Project Statistics

For about a month, I’ve been improving a set of scirpts to calculate statistics on the Qt Project. What I wanted to know, at first, was how well I was doing, how much I was contributing. Another question I had in mind and I know many others did too was “how much is the Qt …

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Apr 03

Qt 5 alpha released

Lars writes to let us know that the first (and hopefully only) Qt 5 alpha has been released! It’s the first in the major release series in 7 years, the first major release of the Qt Project (though not the first release in of the project, since we released 4.8.1 just a few weeks ago). …

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