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Use > rather than == for overflow check in scoped threads.

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Co-authored-by: Jacob Lifshay <programmerjake@gmail.com>
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Mara Bos 2022-01-04 15:58:29 +00:00 committed by GitHub
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commit 2c8cc70ea0
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library/std/src/thread/scoped.rs
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@ -29,7 +29,7 @@ impl ScopeData {
pub(super) fn increment_n_running_threads(&self) {
// We check for 'overflow' with usize::MAX / 2, to make sure there's no
// chance it overflows to 0, which would result in unsoundness.
if self.n_running_threads.fetch_add(1, Ordering::Relaxed) == usize::MAX / 2 {
if self.n_running_threads.fetch_add(1, Ordering::Relaxed) > usize::MAX / 2 {
// This can only reasonably happen by mem::forget()'ing many many ScopedJoinHandles.
self.decrement_n_running_threads(false);
panic!("too many running threads in thread scope");