The next release of #swad will probably bring not a single new feature, but focus on improvements, especially regarding #performance. Support for using #kqueue (#FreeBSD et al) to handle #signals is a part of it (which is done and works). Still unsure whether I'll also add support for #Linux' #signalfd. Using kqueue also as a better backend for #timers is on the list.

Another hopefully quite relevant change is here:

https://github.com/Zirias/poser/commit/798f23547295f89fa0c751f0e707c3474b5c689c

In short, so far my #poser lib was always awaiting readiness notification (from kqueue, or #epoll on Linux, or select/poll for other platforms) before doing any read or write on a socket. This is the ideal approach for reads, because in the common case, a socket is NOT ready for reading ... our kernel must have received something from the remote end first. But for writes, it's not so ideal. The common case is that a socket IS ready to write (because there's space left in the kernel's send buffers). So, just try it, and only register for notifications if it ever fails, makes more sense. Avoids pointless waiting and pointless events, and e.g. with epoll, even unnecessary syscalls.

Early-warning #signals and the role of #H9N2 in the #spillover of avian #influenza viruses, https://etidiohnew.blogspot.com/2025/03/early-warning-signals-and-role-of-h9n2.html

Academic consensus question on #Signals safety

TL,DR: 100%

Signal, a messaging protocol known for its end-to-end encryption, is widely regarded as secure. It is used by popular applications like WhatsApp and Facebook Messenger, serving over a billion users. The protocol includes advanced security features such as "future secrecy" and "post-compromise security," achieved through a technique called ratcheting, which updates session keys with every message sent" #thread (1/4)

The Fourier Transform is a mathematical operation that transforms a function of time (or space) into a function of frequency. It decomposes a complex signal into its constituent sinusoidal components, each with a specific frequency, amplitude, and phase. This is particularly useful in many fields, such as signal processing, physics, and engineering, because it allows for analysing the frequency characteristics of signals. The Fourier Transform provides a bridge between the time and frequency domains, enabling the analysis and manipulation of signals in more intuitive and computationally efficient ways. The result of applying a Fourier Transform is often represented as a spectrum, showing how much of each frequency is present in the original signal.

\[\Large\boxed{\boxed{\widehat{f}(\xi) = \int_{-\infty}^{\infty} f(x)\ e^{-i 2\pi \xi x}\,\mathrm dx, \quad \forall\xi \in \mathbb{R}.}}\]

Inverse Fourier Transform:
\[\Large\boxed{\boxed{ f(x) = \int_{-\infty}^{\infty} \widehat f(\xi)\ e^{i 2 \pi \xi x}\,\mathrm d\xi,\quad \forall x \in \mathbb R.}}\]

The equation allows us to listen to mp3s today. Digital Music Couldn’t Exist Without the Fourier Transform: http://bit.ly/22kbNfi

Could #Tachyons Exist? Breaking the #SpeedOfLight

❛❛ a popular notion floated around by proponents of Tachyons is that Tachyons could be used to transmit #signals back in time, which opens up the door to some interesting #paradoxes. ❜❜

https://www.youtube.com/watch?v=Eu1a9zXyswc 2023 May 21
https://Wikipedia.org/wiki/Tachyon
https://Wikipedia.org/wiki/Gerald_Feinberg

Toinen kokonaan uusi SEP-entry on Mooren ja Palazzolon Animal Communication, https://plato.stanford.edu/entries/animal-communication/

Wow!

"Researchers from the Planetary Habitability Laboratory at the University of Puerto Rico at Arecibo have proposed a compelling explanation for one of the most enigmatic radio signals ever detected—the Wow! Signal."

https://phl.upr.edu/wow/summary

 
One of #Einstein's famous thought experiments is his #Twin #Experiment.
One twin stays on #Earth while the other speeds away in a #spaceship.

Mini 2-minute #animation illustrating the concept. At @KronoMoon, it's not necessary for one to "believe" in Time Travel (which could be irrelevant anyway) in order to discuss it seriously and creatively, and to devise community research experiments through the use of #signals or other means.

https://youtube.com/watch?v=GYU999kfzbs