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Rollup merge of #118798 - GnomedDev:use-atomicu8-backtrace, r=Nilstrieb

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Use AtomicU8 instead of AtomicUsize in backtrace.rs

Just a small inefficiency I saw when looking at std sources.
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Matthias Krüger 2024-01-19 08:15:02 +01:00 committed by GitHub
commit 2d828cd253
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1 changed files with 3 additions and 3 deletions
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6
library/std/src/backtrace.rs
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@ -93,7 +93,7 @@ use crate::env;
use crate::ffi::c_void; use crate::ffi::c_void;
use crate::fmt; use crate::fmt;
use crate::panic::UnwindSafe; use crate::panic::UnwindSafe;
use crate::sync::atomic::{AtomicUsize, Ordering::Relaxed}; use crate::sync::atomic::{AtomicU8, Ordering::Relaxed};
use crate::sync::LazyLock; use crate::sync::LazyLock;
use crate::sys_common::backtrace::{lock, output_filename, set_image_base}; use crate::sys_common::backtrace::{lock, output_filename, set_image_base};
@ -254,7 +254,7 @@ impl Backtrace {
// Cache the result of reading the environment variables to make // Cache the result of reading the environment variables to make
// backtrace captures speedy, because otherwise reading environment // backtrace captures speedy, because otherwise reading environment
// variables every time can be somewhat slow. // variables every time can be somewhat slow.
static ENABLED: AtomicUsize = AtomicUsize::new(0); static ENABLED: AtomicU8 = AtomicU8::new(0);
match ENABLED.load(Relaxed) { match ENABLED.load(Relaxed) {
0 => {} 0 => {}
1 => return false, 1 => return false,
@ -267,7 +267,7 @@ impl Backtrace {
Err(_) => false, Err(_) => false,
}, },
}; };
ENABLED.store(enabled as usize + 1, Relaxed); ENABLED.store(enabled as u8 + 1, Relaxed);
enabled enabled
} }