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HenryEx
Expert Cheater
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Joined: 18 Dec 2011
Posts: 100
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 Posted: Tue Mar 04, 2025 9:25 am Post subject: Problems using createThread() |
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Trying to fetch some game data asynchronously in the background without blocking the interface, and i'm having trouble with this. Most of the time, the UI still locks up while the thread runs.
I've narrowed down my problem to two scenarios.
Why does this freeze GUI until thread completes:
| Code: | local function doSetupThread ( self, func, target, typ )
sleep(2000)
print('Done')
end
local function setupAsync()
createThread(doSetupThread())
end
setupAsync() |
And this doesn not freeze the GUI and runs in the background:
| Code: | local function doSetupThread ( self, func, target, typ )
sleep(2000)
print('Done')
end
local function setupAsync()
createThread(doSetupThread)
end
setupAsync() |
These should be effectively identical.
I don't want to write a separate function for all X threads i want to run, just one generalized function with certain arguments. But whenever i try to pass arguments via createThread (even if there are none), the thread creator seems to wait for the thread.
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Dark Byte
Site Admin
 Reputation: 470
Joined: 09 May 2003
Posts: 25807
Location: The netherlands
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| Posted: Tue Mar 04, 2025 9:56 am Post subject: |
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In the first script you pass the result of doSetupThread to createThread, which isn't a valid function (it returns nil) so doesn't do anything
in the 2nd version you pass the function doSetupThread to create thread, which will result in the function being executed in another thread
if you want to pass parameters do so by adding more parameters to createThread or use local vars (upvalues)
| Code: |
local upvalueexample=4
local function doSetupThread ( self, func, target, typ )
printf("%s %s %s", tostring(func), tostring(target), tostring(typ))
sleep(2000)
print('Done')
printf("upvalueexample=%d",upvalueexample)
end
local function setupAsync()
createThread(doSetupThread, 1,2,'3')
end
setupAsync()
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ParkourPenguin
I post too much
 Reputation: 152
Joined: 06 Jul 2014
Posts: 4706
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| Posted: Tue Mar 04, 2025 10:52 am Post subject: |
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More detail:
| Code: | function foo()
return 5
end
print(('foo() = %d'):format(foo()))
print(('foo = %s'):format(foo))
assert(foo() ~= foo)
createthread(foo()) -- same as `createthread(5)`; bad
createthread(foo) -- this is the one you want |
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HenryEx
Expert Cheater
![]() Reputation: 2
Joined: 18 Dec 2011
Posts: 100
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| Posted: Tue Mar 04, 2025 3:14 pm Post subject: |
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I see how that works, now. I was a bit confused by the wiki entry on it, that clearly shows some ... arguments like this:
| Quote: | | createThread(function(Thread,...), ...) |
I figured since it shows the thread passing itself down to the function in brackets, plus additional ... after that, that you need brackets if you want to send arguments down the line. The additional arguments shown after the brackets didn't help my confusion, but it sorta makes sense now.
This is coming just in time, since i'll be wanting to use pcall() for my threads to make sure they clean up properly despite errors, and that works the same way!
Thanks for the help.
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