How to make a global constant thread local?

To make my code thread-safe, I am making some constant thread local. However, in the following package example

module Foo

const bar = zeros(Threads.nthreads())


the length of bar will be stuck at JULIA_NUM_THREADS at the time of compilation.

What’s the correct way to make the constant bar thread local?

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You can create an empty array (or array of whatever size) where you define bar and then resize! it in an __init__() method (see here: