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| author | Gus Wynn <guswynn@gmail.com> | 2021-09-27 08:43:30 -0700 |
|---|---|---|
| committer | Gus Wynn <guswynn@gmail.com> | 2021-09-27 08:43:30 -0700 |
| commit | 0f9c349834622fa337c8dab886af4041bcdad5bb (patch) | |
| tree | 260131df16901742d1b5056fea5b16c26ef1526f /library/std/src/sync | |
| parent | ac8dd1b2f24dc62c962172b27433106b4e84dc62 (diff) | |
| download | rust-0f9c349834622fa337c8dab886af4041bcdad5bb.tar.gz rust-0f9c349834622fa337c8dab886af4041bcdad5bb.zip | |
lock types
Diffstat (limited to 'library/std/src/sync')
| -rw-r--r-- | library/std/src/sync/mutex.rs | 6 | ||||
| -rw-r--r-- | library/std/src/sync/rwlock.rs | 12 |
2 files changed, 18 insertions, 0 deletions
diff --git a/library/std/src/sync/mutex.rs b/library/std/src/sync/mutex.rs index e1d6324c17e..9abd4b547c7 100644 --- a/library/std/src/sync/mutex.rs +++ b/library/std/src/sync/mutex.rs @@ -188,6 +188,12 @@ unsafe impl<T: ?Sized + Send> Sync for Mutex<T> {} /// [`lock`]: Mutex::lock /// [`try_lock`]: Mutex::try_lock #[must_use = "if unused the Mutex will immediately unlock"] +#[cfg_attr( + not(bootstrap), + must_not_suspend = "Holding a MutexGuard across suspend \ + points can cause deadlocks, delays, \ + and cause Future's to not implement `Send`" +)] #[stable(feature = "rust1", since = "1.0.0")] pub struct MutexGuard<'a, T: ?Sized + 'a> { lock: &'a Mutex<T>, diff --git a/library/std/src/sync/rwlock.rs b/library/std/src/sync/rwlock.rs index e50d62d8173..1523d36323f 100644 --- a/library/std/src/sync/rwlock.rs +++ b/library/std/src/sync/rwlock.rs @@ -95,6 +95,12 @@ unsafe impl<T: ?Sized + Send + Sync> Sync for RwLock<T> {} /// [`read`]: RwLock::read /// [`try_read`]: RwLock::try_read #[must_use = "if unused the RwLock will immediately unlock"] +#[cfg_attr( + not(bootstrap), + must_not_suspend = "Holding a RwLockReadGuard across suspend \ + points can cause deadlocks, delays, \ + and cause Future's to not implement `Send`" +)] #[stable(feature = "rust1", since = "1.0.0")] pub struct RwLockReadGuard<'a, T: ?Sized + 'a> { lock: &'a RwLock<T>, @@ -115,6 +121,12 @@ unsafe impl<T: ?Sized + Sync> Sync for RwLockReadGuard<'_, T> {} /// [`write`]: RwLock::write /// [`try_write`]: RwLock::try_write #[must_use = "if unused the RwLock will immediately unlock"] +#[cfg_attr( + not(bootstrap), + must_not_suspend = "Holding a RwLockWriteGuard across suspend \ + points can cause deadlocks, delays, \ + and cause Future's to not implement `Send`" +)] #[stable(feature = "rust1", since = "1.0.0")] pub struct RwLockWriteGuard<'a, T: ?Sized + 'a> { lock: &'a RwLock<T>, |