bjoernager/rust
bjoernager/rust
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lock types

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This commit is contained in:
Gus Wynn 2021-09-27 08:43:30 -07:00
parent ac8dd1b2f2
commit 0f9c349834
5 changed files with 58 additions and 0 deletions
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6
library/std/src/sync/mutex.rs
View file

@ -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>,

12
library/std/src/sync/rwlock.rs
View file

@ -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>,