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| author | Wedson Almeida Filho <walmeida@microsoft.com> | 2023-03-26 00:57:38 -0300 |
|---|---|---|
| committer | Miguel Ojeda <ojeda@kernel.org> | 2023-04-22 01:46:45 +0200 |
| commit | 19096bce815716cf93fc1ef3965629c3affa26f1 (patch) | |
| tree | bb4d7969a0b433979d3f4a5b64ac2cc50d76078d /rust/kernel/sync/lock.rs | |
| parent | e32cca32c3d452a277884502b9155f3325caf80e (diff) | |
| download | linux-19096bce815716cf93fc1ef3965629c3affa26f1.tar.gz linux-19096bce815716cf93fc1ef3965629c3affa26f1.tar.bz2 linux-19096bce815716cf93fc1ef3965629c3affa26f1.zip | |
rust: sync: introduce `CondVar`
This is the traditional condition variable or monitor synchronisation
primitive. It is implemented with C's `wait_queue_head_t`.
It allows users to release a lock and go to sleep while guaranteeing
that notifications won't be missed. This is achieved by enqueuing a wait
entry before releasing the lock.
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Will Deacon <will@kernel.org>
Cc: Waiman Long <longman@redhat.com>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Signed-off-by: Wedson Almeida Filho <walmeida@microsoft.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20230411054543.21278-12-wedsonaf@gmail.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Diffstat (limited to 'rust/kernel/sync/lock.rs')
| -rw-r--r-- | rust/kernel/sync/lock.rs | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/rust/kernel/sync/lock.rs b/rust/kernel/sync/lock.rs index 802465d1fa54..a2216325632d 100644 --- a/rust/kernel/sync/lock.rs +++ b/rust/kernel/sync/lock.rs @@ -140,7 +140,6 @@ pub struct Guard<'a, T: ?Sized, B: Backend> { unsafe impl<T: Sync + ?Sized, B: Backend> Sync for Guard<'_, T, B> {} impl<T: ?Sized, B: Backend> Guard<'_, T, B> { - #[allow(dead_code)] pub(crate) fn do_unlocked(&mut self, cb: impl FnOnce()) { // SAFETY: The caller owns the lock, so it is safe to unlock it. unsafe { B::unlock(self.lock.state.get(), &self.state) }; |