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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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use super::HasHrTimer;use super::HrTimer;use super::HrTimerCallback;use super::HrTimerCallbackContext;use super::HrTimerHandle;use super::HrTimerMode;use super::HrTimerPointer;use super::RawHrTimerCallback;use crate::sync::Arc;use crate::sync::ArcBorrow;
/// A handle for an `Arc<HasHrTimer<T>>` returned by a call to/// [`HrTimerPointer::start`].pub struct ArcHrTimerHandle<T>where T: HasHrTimer<T>,{ pub(crate) inner: Arc<T>,}
// SAFETY: We implement drop below, and we cancel the timer in the drop// implementation.unsafe impl<T> HrTimerHandle for ArcHrTimerHandle<T>where T: HasHrTimer<T>,{ fn cancel(&mut self) -> bool { let self_ptr = Arc::as_ptr(&self.inner);
// SAFETY: As we obtained `self_ptr` from a valid reference above, it // must point to a valid `T`. let timer_ptr = unsafe { <T as HasHrTimer<T>>::raw_get_timer(self_ptr) };
// SAFETY: As `timer_ptr` points into `T` and `T` is valid, `timer_ptr` // must point to a valid `HrTimer` instance. unsafe { HrTimer::<T>::raw_cancel(timer_ptr) } }}
impl<T> Drop for ArcHrTimerHandle<T>where T: HasHrTimer<T>,{ fn drop(&mut self) { self.cancel(); }}
impl<T> HrTimerPointer for Arc<T>where T: 'static, T: Send + Sync, T: HasHrTimer<T>, T: for<'a> HrTimerCallback<Pointer<'a> = Self>,{ type TimerMode = <T as HasHrTimer<T>>::TimerMode; type TimerHandle = ArcHrTimerHandle<T>;
fn start( self, expires: <<T as HasHrTimer<T>>::TimerMode as HrTimerMode>::Expires, ) -> ArcHrTimerHandle<T> { // SAFETY: // - We keep `self` alive by wrapping it in a handle below. // - Since we generate the pointer passed to `start` from a valid // reference, it is a valid pointer. unsafe { T::start(Arc::as_ptr(&self), expires) }; ArcHrTimerHandle { inner: self } }}
impl<T> RawHrTimerCallback for Arc<T>where T: 'static, T: HasHrTimer<T>, T: for<'a> HrTimerCallback<Pointer<'a> = Self>,{ type CallbackTarget<'a> = ArcBorrow<'a, T>;
unsafe extern "C" fn run(ptr: *mut bindings::hrtimer) -> bindings::hrtimer_restart { // `HrTimer` is `repr(C)` let timer_ptr = ptr.cast::<super::HrTimer<T>>();
// SAFETY: By C API contract `ptr` is the pointer we passed when // queuing the timer, so it is a `HrTimer<T>` embedded in a `T`. let data_ptr = unsafe { T::timer_container_of(timer_ptr) };
// SAFETY: // - `data_ptr` is derived form the pointer to the `T` that was used to // queue the timer. // - As per the safety requirements of the trait `HrTimerHandle`, the // `ArcHrTimerHandle` associated with this timer is guaranteed to // be alive until this method returns. That handle borrows the `T` // behind `data_ptr` thus guaranteeing the validity of // the `ArcBorrow` created below. // - We own one refcount in the `ArcTimerHandle` associated with this // timer, so it is not possible to get a `UniqueArc` to this // allocation from other `Arc` clones. let receiver = unsafe { ArcBorrow::from_raw(data_ptr) };
// SAFETY: // - By C API contract `timer_ptr` is the pointer that we passed when queuing the timer, so // it is a valid pointer to a `HrTimer<T>` embedded in a `T`. // - We are within `RawHrTimerCallback::run` let context = unsafe { HrTimerCallbackContext::from_raw(timer_ptr) };
T::run(receiver, context).into_c() }}