# Based on which packages is Base.Threads built?
**URL:** https://discourse.julialang.org/t/based-on-which-packages-is-base-threads-built/93930
**Category:** Performance
**Tags:** question
**Created:** [February 2, 2023, 2:48pm UTC](https://discourse.julialang.org/t/based-on-which-packages-is-base-threads-built/93930 "2023-02-02T14:48:02Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Amro](https://discourse.julialang.org/u/Amro)
#### Post date: [February 2, 2023, 2:48pm UTC](https://discourse.julialang.org/t/based-on-which-packages-is-base-threads-built/93930/1 "2023-02-02T14:48:02Z")
I am happy to use the functions in `Base.Threads`, and I am carious to know that based on which packages this `Base.Threads` is built? is it `OneAPI`, `OpenMP`, etc.?
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### Author:  [@StefanKarpinski](https://discourse.julialang.org/u/StefanKarpinski)
#### Post date: [February 2, 2023, 5:59pm UTC](https://discourse.julialang.org/t/based-on-which-packages-is-base-threads-built/93930/2 "2023-02-02T17:59:46Z")
It’s not build on high-level threading frameworks. It uses `libuv`’s threading APIs, which are thin wrappers around OS native thread APIs; elsewhere it uses some pthreads functions directly on UNIX systems and corresponding Windows threading APIs on Windows.
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### Author:  [@Amro](https://discourse.julialang.org/u/Amro)
#### Post date: [February 2, 2023, 6:06pm UTC](https://discourse.julialang.org/t/based-on-which-packages-is-base-threads-built/93930/3 "2023-02-02T18:06:10Z")
> [@StefanKarpinski](#):
>
> elsewhere it uses some pthreads functions directly on UNIX systems and corresponding Windows threading APIs on Windows
Thanks for your reply.
For curiosity, could you please give me a link to the library of those `pthreads functions`?
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### Author:  [@StefanKarpinski](https://discourse.julialang.org/u/StefanKarpinski)
#### Post date: [February 3, 2023, 3:32am UTC](https://discourse.julialang.org/t/based-on-which-packages-is-base-threads-built/93930/4 "2023-02-03T03:32:56Z")
Grep for `thread` in the `src` directory.
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### Author:  [@Amro](https://discourse.julialang.org/u/Amro)
#### Post date: [February 3, 2023, 12:01pm UTC](https://discourse.julialang.org/t/based-on-which-packages-is-base-threads-built/93930/5 "2023-02-03T12:01:47Z")
Thanks!