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Rollup merge of #124412 - RalfJung:io-safety, r=Amanieu

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io safety: update Unix explanation to use `Arc`

Fixes https://github.com/rust-lang/rust/issues/124384

Cc ```@jsgf```
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Matthias Krüger 2024-05-03 06:04:19 +02:00 • committed by GitHub
commit 9ab5cfd91e
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2 changed files with 22 additions and 11 deletions
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library/std/src/io/mod.rs
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@ -266,7 +266,7 @@
//! its file descriptors with no operations being performed by any other part of the program.
//!
//! Note that exclusive ownership of a file descriptor does *not* imply exclusive ownership of the
//! underlying kernel object that the file descriptor references (also called "file description" on
//! underlying kernel object that the file descriptor references (also called "open file description" on
//! some operating systems). File descriptors basically work like [`Arc`]: when you receive an owned
//! file descriptor, you cannot know whether there are any other file descriptors that reference the
//! same kernel object. However, when you create a new kernel object, you know that you are holding