12-08-2020, 10:28 AM
https://www.techpowerup.com/274967/psa-a...-installed
Quote:If you're a programmer you'd have /facepalm'd by now, let me explain. In a multi-threaded program, Events are often used to synchronize concurrently running threads. Events are a core feature of the Windows operating system, once created, they can be set to "signaled", which will notify every other piece of code that is watching the status of this event—instantly and even across process boundaries. In this case the Radeon Settings program will wait for an event called "DVRReadyEvent" to get created, before it continues with initialization. This event gets created by a separate, independent, driver component, that's supposed to get loaded on startup, too, but apparently never does. The Task Scheduler entries in the screenshot above do show "StartDVR". The naming suggests it's related to the ReLive recording feature that lets you capture and stream gameplay. I guess that part of the driver does indeed check if Radeon hardware is present, and will not start otherwise. Since Windows has no WaitForEventToGetCreated() function, the usual approach is to try to open the event until it can be opened, at which point you know that it does exist.
You're probably asking now, "what if the event never gets created?" Exactly, your program will be hung, forever, caught in an infinite loop. The correct way to implement this code is to either set a time limit for how long the loop should run, or count the number of runs and give up after 100, 1000, 1 million, you pick a number—but it's important to set a reasonable limit.
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Waiting on synchronization signals is very basic programming skills, most midterm students would be able to implement it correctly. That's why I'm so surprised to see such low quality code in a graphics driver component that get installed on hundreds of millions of computers. Modern software development techniques avoid these mistakes by code reviews—one or multiple colleagues read your source code and point out potential issues. There's also "unit testing", which requires developers to write testing code that's separate from the main code. These unit tests can then be executed automatically to measure "code coverage"—how many percent of the program code are verified to be correct through the use of unit tests. Let's just hope AMD fixes this bug, it should be trivial.
If you are affected by this issue, just uninstall the AMD driver from Windows Settings - Apps and Features. If that doesn't work, use DDU. It's not a big deal anyway, what's most important is that you are aware, in case your system feels sluggish after a graphics hardware change.