# How to trigger non-blocking long calculations in Makie?
**URL:** https://discourse.julialang.org/t/how-to-trigger-non-blocking-long-calculations-in-makie/90496
**Category:** Visualization
**Tags:** makie, glmakie
**Created:** [November 19, 2022, 1:30pm UTC](https://discourse.julialang.org/t/how-to-trigger-non-blocking-long-calculations-in-makie/90496 "2022-11-19T13:30:00Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Krastanov](https://discourse.julialang.org/u/Krastanov)
#### Post date: [November 19, 2022, 1:30pm UTC](https://discourse.julialang.org/t/how-to-trigger-non-blocking-long-calculations-in-makie/90496/1 "2022-11-19T13:30:00Z")
I want to do the following in Makie: press a button which triggers long computation that interactively updates the plot. I can’t seem to figure it out. Here is a MWE:
This example uses the bool observable `running` to track whether the long computation is triggered.
```julia
F = Figure(resolution=(600,600))
F[1,1] = inputgrid = GridLayout(tellwidth = false)
running = Observable(false)
b = Button(F, label = @lift(string($running)))
inputgrid[1,1] = b
on(b.clicks) do _
running[] = true # this should change the button label from "false" to "true"
sleep(1) # this is the long computation
running[] = false # resetting the button label
end
F
```
When I press the button, the plot becomes non-responsive for a second and the label does not change. I am expecting the label to change immediately on button press to “true” and then change back to “false” after a second.
What am I doing wrong? Are `notify` calls incapable of working when called from withing an `on` call? How can I make the button turn to “true” on click and then on its own turn back to “false”?
This is on Julia 1.8.2 and GLMakie v0.7.3.
---
### Author:  [@jules](https://discourse.julialang.org/u/jules)
#### Post date: [November 19, 2022, 1:35pm UTC](https://discourse.julialang.org/t/how-to-trigger-non-blocking-long-calculations-in-makie/90496/2 "2022-11-19T13:35:19Z")
If sleeping happens on the main thread then no rendering can happen (rendering is done asynchronously but not on a different thread). You can use `@async begin` around the stuff in the `on` call and the whole thing will be interleaved with the rendering using coroutines, even if there’s still only one thread.
---
### Author:  [@Krastanov](https://discourse.julialang.org/u/Krastanov)
#### Post date: [November 19, 2022, 1:48pm UTC](https://discourse.julialang.org/t/how-to-trigger-non-blocking-long-calculations-in-makie/90496/3 "2022-11-19T13:48:16Z")
Thank you! Indeed, all I needed was to add `@async`
```julia
on(b.clicks) do _
@async begin
running[] = true
sleep(1)
running[] = false
end
end
```