Track down race conditions with Go
Programming Snapshot – Racing Goroutines
© Lead Image © alphaspirit, 123RF.com
If program parts running in parallel keep interfering with each other, you may have a race condition. Mike Schilli shows how to instruct the Go compiler to detect these conditions and how to avoid them in the first place.
If programmers are not careful, program parts that are running in parallel will constantly get in each other's way, whether as processes, threads, or goroutines. If you leave the order in which system components read or modify data to chance, you are adding time bombs to your code. They will blow up sooner or later, leaving you with runtime errors that are difficult to troubleshoot. But how do you avoid them?
The common assumption that components will run in the same order that a program calls them is a fallacy – one easily refuted with an example such as in Listing 1. But coincidence can also be a factor. It is quite possible for something to work once but then crash after a small, and often unrelated, change to the code. The load on the system you are using can also play a role: Something may work flawlessly in slack times but fall apart unexpectedly under a heavy load.
The fact that unsynchronized goroutines do not run in the order in which they are defined, even if the program starts them one after the other, is nicely illustrated by Listing 1 [1] and the output in the upper part of Figure 1. Although the for loop starts goroutine first, followed by 1, then 2, and so on, as defined by the index numbers in i, the upper part of Figure 1 makes it clear from the compiled program's output that chaos reigns, and the goroutines write their messages to the output as a wildly confusing mess.
[...]
Buy this article as PDF
(incl. VAT)
Buy Linux Magazine
US / Canada
UK / Australia
Direct Download
Read full article as PDF:
Price $2.95
News
-
Linux Can Now Run on Apple’s M1 Chipset
Linux users looking to take advantage of Apple Silicon are about to get their wish with the M1 chipset.
-
MX Linux 21 RC Candidate Available For Testing
The MX Linux development team has released the RC images for MX Linux 21 for testing purposes.
-
Fedora 35 is Shaping Up to Be an Impressive Release
Although the beta version of Fedora’s upcoming release is behind schedule, the Linux distribution is still slotted for October and will include numerous bug fixes and some exciting new features.
-
Canonical Extends Support For Ubuntu 14.04 and 16.04
The company behind Ubuntu offered a much-needed lifeline to those who still depend on older versions of the open-source operating system.
-
GNOME 41 Has Arrived
The latest version of the GNOME desktop environment has been released with new functionality and plenty of improvements.
-
System76 Updates the 15" Pangolin with Ryzen
System76 announced they’re updating the Ryzen-powered Pangolin laptop to meet today’s need for more power.
-
KDE Plasma 5.23 Promises Plenty of Subtle Improvements
The next release of the KDE Plasma desktop includes new features, numerous improvements, and plenty of bug fixes.
-
GNOME 41 Beta is Now Available
The most popular open-source desktop environment is on the cusp of yet another new release, but don’t expect the massive changes found in the previous iteration.
-
Debian 11 “Bullseye” Now Available
The developers of Debian have released the latest version of the operating system so many distributions depend on.
-
Elementary OS 6 Odin Now Available
The developers of elementary OS have released their latest iteration which is all-in on Flatpaks and all about the user experience.