How Perl programmers efficiently manage asynchronous program flows
Pyramid of Doom
Asynchronous program flow quickly degenerates into unreadable code if it lacks an overarching concept to provide structure. Fortunately, the JavaScript community has invented some functional tricks that also help tame asynchronous Perl code.
Even experts can unintentionally build race conditions into their code. Even they can easily overlook the side effects when multithreading suddenly interrupts the flow of code. Emergency teams later have to discover the causes, which involves a huge amount of effort. After all, the error the customer reports occurs only sporadically, because it only occurs given the temporal coincidence of certain events that cannot be easily reproduced by the development department.
One Thread Is Enough
If only one thread is running – as in a JavaScript application – then there can be no such race conditions, because the CPU runs the code as written, and nothing unexpected interrupts the flow. In other words, this approach has its benefits.
For a program with only one thread to run as fast as one with multiple threads, however, it must not be allowed to sit and twiddle its thumbs while, for example, a much slower network operation is in progress. To allow this to happen, the programmer relinquishes control over selected parts of the program to an event loop, which executes the events asynchronously. Once a programmer's brain has mastered the jump to asynchronous program flows, even complicated processes are wonderfully easy to write. Before that happens, however, some hurdles must be taken.
[...]
Buy this article as PDF
(incl. VAT)
Buy Linux Magazine
Subscribe to our Linux Newsletters
Find Linux and Open Source Jobs
Subscribe to our ADMIN Newsletters
Support Our Work
Linux Magazine content is made possible with support from readers like you. Please consider contributing when you’ve found an article to be beneficial.
News
-
Hannah Montana Linux Is Back!
Developer Noah Cagle decided the world needed the once obscure but beloved Linux distribution and gave it a decidedly pink refresh.
-
System76 Refreshes the Lemur Laptop
If you're looking for a laptop with tons of power and battery, look no further than the latest iteration of the System76 Lemur Pro.
-
More than 43 Million Lines of Code in Linux Kernel 7.2
Using the cloc utility, Michael Larabel of Phoronix discovered that Linux kernel 7.2 has over 43 million lines of code.
-
Kubuntu Focus Goes Ultra
The Kubuntu Focus team has upped the performance ante of its M2 and Zr laptops with the latest, greatest CPUs from Intel.
-
Linux Gamers May Soon See Less Mouse Lag in KDE Plasma
Gamers using KDE’s Plasma desktop have been suffering from a slight input delay in mouse movement that could lead to getting fragged.
-
Three Lines of Code Improve Linux Storage Performance
A developer changed three lines of code, giving Linux storage performance a 5% bump.
-
AUR Hit Again with Malicious Packages
Once again the Arch User Repository is plagued by a high volume of malicious packages.
-
Alpine Linux 3.24 Features Fresh Desktops and a Newer Kernel
If you're a fan of Alpine Linux, it's time to upgrade because the latest version has been released with KDE Plasma 6.6, Gnome 50, and Linux kernel 6.18 LTS.
-
EU Open Source Strategy Plays Key Role in Tech Sovereignty Package
Comprehensive measures adopted by the European Commission aim to reduce dependency on non-EU countries.
-
Linux Foundation Report Indicates AI Driving Tech Hiring
Within growing security and skills gaps, AI has been found to be a positive driving force behind tech hiring trends in Europe.