Hi!
I have a somewhat unusual use-case that I’m trying to figure out.
I have a command-line swift app whose main thread ends up in an infinite loop
for graphics rendering purposes (running SDL).
What I’m hoping to do is to be able to run async code like this from within
that infinite loop:
DispatchQueue.someQueue.async {
// do something
DispatchQueue.main.async {
// return result
}
}
The issue is that the DispatchQueue.main.async block never runs, which is
pretty logical given that it’s called inside the infinite loop - so where would
it possibly get to run?
The question is, how do we achieve this? Is there a better way to have an
infinite loop on the main thread (e.g. Foundation’s RunLoop class etc)? On iOS
(where I have the most experience with Swift), the rendering loop’s
implementation is obviously hidden.
Theoretically we could probably do the entire rendering loop like this:
func renderStuff() {
// actually render stuff
if !shouldQuit {
DispatchQueue.main.async(renderStuff) // loops here
}
}
// Start render loop:
DispatchQueue.main.async(renderStuff)
But I am pretty sure the DispatchQueue API is not intended to be used like that
:)
Any ideas? Maybe an API that basically says “dequeue and perform work from the
DispatchQueue”?
Cheers,
Geordie
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