This one will be a quicky, but something I realized that callback threads tend to do for RBXScriptConnections is that they will reuse the same thread when applicable. This helps save performance by not having to recreate a new thread every invocation and thus levying the overall GC load.
local Last
local function OnPreAnimation()
local Current = coroutine.running()
-- always true after initial invocation
print(Current == Last)
Last = Current
end
RunService.PreAnimation:Connect(OnPreAnimation)
However, this optimization won’t work if the callback yields, because the previous thread still needs to be used for when the last invocation resumes.
local Last
local function OnPreAnimation()
local Current = coroutine.running()
-- now always false
print(Current == Last)
Last = Current
-- yielding!
task.wait()
end
RunService.PreAnimation:Connect(OnPreAnimation)
Many of you might also know that this is the same optimization used for stravant’s GoodSignal implementation, and so the same rules for it also apply.