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Gauges and FSX threads

mendiola_loyola

mendiola_loyola

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Dear All:

Does FSX create a new thread when it loads a new gauge (dll) or does it run
the gauge(dll) inside the FSX main thread (in process).

If the answer is NO, It could be interesting that gauges run on separated threads to use multicore processors.

Thanks.
Alfredo Mendiola Loyola
 
By design, all gauge code is executed "in process" of the main FS thread, AFAIK.

There are probably some methods to move select portions of a gauge's code to a separate thread, but that's way beyond my abilities.
 
Yes, the panel system works in the main FS thread. And, using the Gauge SDK function to read simulation variables, they are not thread safe so, if you create a separate thread yourself, and call those functions from the other thread, you might run into threading issues and crashes.

A typical example would be using timers to poll flight sim variables: there are many kind of timers available in Windows, and the more modern and flexible ones, like the multimedia timers, are all using separate threads so, they'll not work very well within a gauge. The only one that is safe to use, is the SetTimer call, because it's not using a separate thread.

Of course, if you only use Simconnect calls to interface with FSX, there shouldn't be any threading issues at all, since Simconnect is designed to run between whole different apps.

Of course, moving to a separate thread something that is only relevant to your own code, like a complex calculation or the loading of a big database in the background, you shouldn't run in threading issues with FSX, and it's something you might use.
 
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