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RwLock guards are Sync if T is #45682

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merged 1 commit into from
Nov 7, 2017
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RwLock guards are Sync if T is #45682

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11 changes: 8 additions & 3 deletions src/libstd/sync/rwlock.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,6 @@

use cell::UnsafeCell;
use fmt;
use marker;
use mem;
use ops::{Deref, DerefMut};
use ptr;
Expand Down Expand Up @@ -102,7 +101,10 @@ pub struct RwLockReadGuard<'a, T: ?Sized + 'a> {
}

#[stable(feature = "rust1", since = "1.0.0")]
impl<'a, T: ?Sized> !marker::Send for RwLockReadGuard<'a, T> {}
impl<'a, T: ?Sized> !Send for RwLockReadGuard<'a, T> {}

#[stable(feature = "rwlock_guard_sync", since = "1.23.0")]
unsafe impl<'a, T: ?Sized + Sync> Sync for RwLockReadGuard<'a, T> {}

/// RAII structure used to release the exclusive write access of a lock when
/// dropped.
Expand All @@ -121,7 +123,10 @@ pub struct RwLockWriteGuard<'a, T: ?Sized + 'a> {
}

#[stable(feature = "rust1", since = "1.0.0")]
impl<'a, T: ?Sized> !marker::Send for RwLockWriteGuard<'a, T> {}
impl<'a, T: ?Sized> !Send for RwLockWriteGuard<'a, T> {}

#[stable(feature = "rwlock_guard_sync", since = "1.23.0")]
unsafe impl<'a, T: ?Sized + Sync> Sync for RwLockWriteGuard<'a, T> {}

impl<T> RwLock<T> {
/// Creates a new instance of an `RwLock<T>` which is unlocked.
Expand Down