diff options
Diffstat (limited to 'tokio/src/sync/batch_semaphore.rs')
| -rw-r--r-- | tokio/src/sync/batch_semaphore.rs | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/tokio/src/sync/batch_semaphore.rs b/tokio/src/sync/batch_semaphore.rs index 5d15311d..436737a6 100644 --- a/tokio/src/sync/batch_semaphore.rs +++ b/tokio/src/sync/batch_semaphore.rs @@ -463,6 +463,13 @@ impl Drop for Acquire<'_> { } } +// Safety: the `Acquire` future is not `Sync` automatically because it contains +// a `Waiter`, which, in turn, contains an `UnsafeCell`. However, the +// `UnsafeCell` is only accessed when the future is borrowed mutably (either in +// `poll` or in `drop`). Therefore, it is safe (although not particularly +// _useful_) for the future to be borrowed immutably across threads. +unsafe impl Sync for Acquire<'_> {} + // ===== impl AcquireError ==== impl AcquireError { |