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Diffstat (limited to 'src/libstd')
| -rw-r--r-- | src/libstd/sync/once.rs | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libstd/sync/once.rs b/src/libstd/sync/once.rs index 4c14fe75643..c135471e2f2 100644 --- a/src/libstd/sync/once.rs +++ b/src/libstd/sync/once.rs @@ -171,6 +171,7 @@ const STATE_MASK: usize = 0x3; // `wait` would both hand out a mutable reference to its `Waiter` node, and keep // a shared reference to check `signaled`. Instead we hold shared references and // use interior mutability. +#[repr(align(4))] // Ensure the two lower bits are free to use as state bits. struct Waiter { thread: Cell<Option<Thread>>, signaled: AtomicBool, |