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Clarify that RUST_MIN_STACK is internally cached

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For larger applications it's important that users set `RUST_MIN_STACK`
at the start of their program because `min_stack` caches the value.
Not doing so can lead to their `env::set_var` call surprisingly not having any effect.
This commit is contained in:
Sean Linsley 2023-03-16 11:07:42 -05:00 • committed by GitHub
parent 7ac4b82ddd
commit 54567efda7
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1 changed files with 2 additions and 1 deletions
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3
library/std/src/thread/mod.rs
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@ -131,7 +131,8 @@
//! //!
//! * Build the thread with [`Builder`] and pass the desired stack size to [`Builder::stack_size`]. //! * Build the thread with [`Builder`] and pass the desired stack size to [`Builder::stack_size`].
//! * Set the `RUST_MIN_STACK` environment variable to an integer representing the desired stack //! * Set the `RUST_MIN_STACK` environment variable to an integer representing the desired stack
//! size (in bytes). Note that setting [`Builder::stack_size`] will override this. //! size (in bytes). Note that setting [`Builder::stack_size`] will override this. Also, note
//! that `RUST_MIN_STACK` is cached internally so should be set before any threads are started.
//! //!
//! Note that the stack size of the main thread is *not* determined by Rust. //! Note that the stack size of the main thread is *not* determined by Rust.
//! //!