diff options
Diffstat (limited to 'src/bytes.rs')
| -rw-r--r-- | src/bytes.rs | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/bytes.rs b/src/bytes.rs index b962649..6282cf4 100644 --- a/src/bytes.rs +++ b/src/bytes.rs @@ -1940,8 +1940,11 @@ impl Inner { #[inline] fn inline_len(&self) -> usize { - let p: &usize = unsafe { mem::transmute(&self.arc) }; - (p & INLINE_LEN_MASK) >> INLINE_LEN_OFFSET + // This is undefind behavior due to a data race, but experimental + // evidence shows that it works in practice (discussion: + // https://internals.rust-lang.org/t/bit-wise-reasoning-for-atomic-accesses/8853). + let p: *const usize = unsafe { mem::transmute(&self.arc) }; + (unsafe { *p } & INLINE_LEN_MASK) >> INLINE_LEN_OFFSET } /// Set the length of the inline buffer. This is done by writing to the |