# Making a task.sticky = false run in any thread
**URL:** https://discourse.julialang.org/t/making-a-task-sticky-false-run-in-any-thread/41396
**Category:** New to Julia
**Tags:** multithreading
**Created:** [June 14, 2020, 6:30pm UTC](https://discourse.julialang.org/t/making-a-task-sticky-false-run-in-any-thread/41396 "2020-06-14T18:30:10Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Leandro\_Bataglia](https://discourse.julialang.org/u/Leandro_Bataglia)
#### Post date: [June 14, 2020, 6:30pm UTC](https://discourse.julialang.org/t/making-a-task-sticky-false-run-in-any-thread/41396/1 "2020-06-14T18:30:10Z")
I was experimenting with multithreading to learn more about Julia’s multithreading capabilities. I tried to replicate the @spawn steps with ordinary Task creation:
```julia
function prime_check(n)
for i = 2:n/2
if n%i == 0
return nothing
end
end
return n
end
function primes_spawn!(A , value)
cond = ReentrantLock()
@sync for i = 2:value
Threads.@spawn begin
a = prime_check(i)
if a != nothing
lock(cond)
push!(A, a)
unlock(cond)
end
end
end
end
function primes_task!(A, value::Int)
cond = ReentrantLock()
for i = 2:value
let
local task = Task(()->prime_check(i))
task.sticky = false
schedule(task)
if fetch(task) != nothing
lock(cond)
println(fetch(task), " running on thread ", threadid())
#push!(A, fetch(task))
unlock(cond)
wait(task)
end
end
end
end
```
When I run it I get the following result:
```julia
A = Int64[]
primes_task!(A, 20)
```
```julia
2 running on thread 1
3 running on thread 1
5 running on thread 1
7 running on thread 1
11 running on thread 1
13 running on thread 1
17 running on thread 1
19 running on thread 1
```
Julia code warns the following:
#Note there are three reasons a Task might be put into a sticky queue
# even if t.sticky == false:
# 1. The Task’s stack is currently being used by the scheduler for a certain thread.
# 2. There is only 1 thread.
# 3. The multiq is full (can be fixed by making it growable).
But I don’t know where to fix it to make it work correctly.
---
### Author:  [@Luapulu](https://discourse.julialang.org/u/Luapulu)
#### Post date: [September 5, 2022, 7:20am UTC](https://discourse.julialang.org/t/making-a-task-sticky-false-run-in-any-thread/41396/2 "2022-09-05T07:20:52Z")
Did you end up getting an answer?
Edit: if anybody stumbles across this, I found [this paper](https://proceedings.juliacon.org/papers/10.21105/jcon.00054.pdf) useful for understanding Julias Task system.
---
### Author:  [@mkitti](https://discourse.julialang.org/u/mkitti)
#### Post date: [September 7, 2022, 8:48am UTC](https://discourse.julialang.org/t/making-a-task-sticky-false-run-in-any-thread/41396/3 "2022-09-07T08:48:33Z")
Make sure to pass `-t auto` as a command line option for Julia to launch multiple threads.