Struct ocl::FutureRwGuard

#[must_use = "futures do nothing unless polled"]
pub struct FutureRwGuard<T, G> { /* fields omitted */ }

A future that resolves to a read or write guard after ensuring that the data being guarded is appropriately locked during the execution of an OpenCL command.

1. Waits until both an exclusive data lock can be obtained and all prerequisite OpenCL commands have completed.
2. Triggers an OpenCL command, remaining locked while the command executes.
3. Returns a guard which provides exclusive (write) or shared (read) access to the locked data.

Methods

impl<T, G> FutureRwGuard<T, G> where
    G: RwGuard<T>, 

fn set_wait_list<L: Into<EventList>>(&mut self, wait_list: L)

Sets an event wait list.

Setting a wait list will cause this FutureRwGuard to wait until contained events have their status set to complete before obtaining a lock on the guarded internal Vec.

[UNSTABLE]: This method may be renamed or otherwise changed at any time.

fn set_command_completion_event(&mut self, command_completion: Event)

Sets a command completion event.

If a command completion event corresponding to the read or write command being executed in association with this FutureRwGuard is specified before this FutureRwGuard is polled it will cause this FutureRwGuard to suffix itself with an additional future that will wait until the command completion event completes before resolving into an RwGuard.

Not specifying a command completion event will cause this FutureRwGuard to resolve into an RwGuard immediately after the lock is obtained (indicated by the optionally created lock event).

TODO: Reword this. [UNSTABLE]: This method may be renamed or otherwise changed at any time.

fn create_lock_event<C: ClContextPtr>(
    &mut self,
    context: C
) -> AsyncResult<&Event>

Creates an event which will be triggered when a lock is obtained on the guarded internal Vec.

The returned event can be added to the wait list of subsequent OpenCL commands with the expectation that when all preceding futures are complete, the event will automatically be 'triggered' by having its status set to complete, causing those commands to execute. This can be used to inject host side code in amongst OpenCL commands without thread blocking or extra delays of any kind.

fn create_release_event<C: ClContextPtr>(
    &mut self,
    context: C
) -> AsyncResult<&Event>

Creates an event which will be triggered after this future resolves and the ensuing RwGuard is dropped or manually released.

The returned event can be added to the wait list of subsequent OpenCL commands with the expectation that when all preceding futures are complete, the event will automatically be 'triggered' by having its status set to complete, causing those commands to execute. This can be used to inject host side code in amongst OpenCL commands without thread blocking or extra delays of any kind.

[UNSTABLE]: This method may be renamed or otherwise changed at any time.

fn lock_event(&self) -> Option<&Event>

Returns a reference to the event previously created with ::create_lock_event which will trigger (be completed) when the wait events are complete and the lock is locked.

fn release_event(&self) -> Option<&Event>

Returns a reference to the event previously created with ::create_release_event which will trigger (be completed) when a lock is obtained on the guarded internal Vec.

[UNSTABLE]: This method may be renamed or otherwise changed at any time.

fn wait(self) -> AsyncResult<G>

Blocks the current thread until the OpenCL command is complete and an appropriate lock can be obtained on the underlying data.

unsafe fn as_mut_ptr(&self) -> Option<*mut T>

Returns a mutable pointer to the data contained within the internal Vec, bypassing all locks and protections.

unsafe fn as_mut_slice<'a, 'b>(&'a self) -> Option<&'b mut [T]>

Returns a mutable slice to the data contained within the internal Vec, bypassing all locks and protections.

fn len(&self) -> usize

Returns the length of the internal Vec.

impl<T> FutureRwGuard<T, ReadGuard<T>>

fn upgrade_after_command(self) -> FutureWriter<T>

Trait Implementations

impl<T: Debug, G: Debug> Debug for FutureRwGuard<T, G>

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl<T, G> Future for FutureRwGuard<T, G> where
    G: RwGuard<T>, 

type Item = G

The type of value that this future will resolved with if it is successful.

type Error = AsyncError

The type of error that this future will resolve with if it fails in a normal fashion.

fn poll(&mut self) -> Poll<Self::Item, Self::Error>

Query this future to see if its value has become available, registering interest if it is not.

fn wait(self) -> Result<Self::Item, Self::Error>

Block the current thread until this future is resolved.

fn boxed(
    self
) -> Box<Future<Error = Self::Error, Item = Self::Item> + 'static + Send> where
    Self: Send + 'static, 

Convenience function for turning this future into a trait object which is also Send.

fn map<F, U>(self, f: F) -> Map<Self, F> where
    F: FnOnce(Self::Item) -> U, 

Map this future's result to a different type, returning a new future of the resulting type.

fn map_err<F, E>(self, f: F) -> MapErr<Self, F> where
    F: FnOnce(Self::Error) -> E, 

Map this future's error to a different error, returning a new future.

fn from_err<E>(self) -> FromErr<Self, E> where
    E: From<Self::Error>, 

Map this future's error to any error implementing From for this future's Error, returning a new future.

fn then<F, B>(self, f: F) -> Then<Self, B, F> where
    B: IntoFuture,
    F: FnOnce(Result<Self::Item, Self::Error>) -> B, 

Chain on a computation for when a future finished, passing the result of the future to the provided closure f.

fn and_then<F, B>(self, f: F) -> AndThen<Self, B, F> where
    B: IntoFuture<Error = Self::Error>,
    F: FnOnce(Self::Item) -> B, 

Execute another future after this one has resolved successfully.

fn or_else<F, B>(self, f: F) -> OrElse<Self, B, F> where
    B: IntoFuture<Item = Self::Item>,
    F: FnOnce(Self::Error) -> B, 

Execute another future if this one resolves with an error.

fn select<B>(self, other: B) -> Select<Self, B::Future> where
    B: IntoFuture<Item = Self::Item, Error = Self::Error>, 

Waits for either one of two futures to complete.

fn select2<B>(self, other: B) -> Select2<Self, B::Future> where
    B: IntoFuture, 

Waits for either one of two differently-typed futures to complete.

fn join<B>(self, other: B) -> Join<Self, B::Future> where
    B: IntoFuture<Error = Self::Error>, 

Joins the result of two futures, waiting for them both to complete.

fn join3<B, C>(self, b: B, c: C) -> Join3<Self, B::Future, C::Future> where
    B: IntoFuture<Error = Self::Error>,
    C: IntoFuture<Error = Self::Error>, 

Same as join, but with more futures.

fn join4<B, C, D>(
    self,
    b: B,
    c: C,
    d: D
) -> Join4<Self, B::Future, C::Future, D::Future> where
    B: IntoFuture<Error = Self::Error>,
    C: IntoFuture<Error = Self::Error>,
    D: IntoFuture<Error = Self::Error>, 

Same as join, but with more futures.

fn join5<B, C, D, E>(
    self,
    b: B,
    c: C,
    d: D,
    e: E
) -> Join5<Self, B::Future, C::Future, D::Future, E::Future> where
    B: IntoFuture<Error = Self::Error>,
    C: IntoFuture<Error = Self::Error>,
    D: IntoFuture<Error = Self::Error>,
    E: IntoFuture<Error = Self::Error>, 

Same as join, but with more futures.

fn into_stream(self) -> IntoStream<Self>

Convert this future into a single element stream.

fn flatten(self) -> Flatten<Self> where
    Self::Item: IntoFuture,
    Self::Item::Error: From<Self::Error>, 

Flatten the execution of this future when the successful result of this future is itself another future.

fn flatten_stream(self) -> FlattenStream<Self> where
    Self::Item: Stream,
    Self::Item::Error == Self::Error, 

Flatten the execution of this future when the successful result of this future is a stream.

fn fuse(self) -> Fuse<Self>

Fuse a future such that poll will never again be called once it has completed.

fn catch_unwind(self) -> CatchUnwind<Self> where
    Self: UnwindSafe, 

Catches unwinding panics while polling the future.

fn shared(self) -> Shared<Self>

Create a cloneable handle to this future where all handles will resolve to the same result.

impl<T, G> Drop for FutureRwGuard<T, G>

fn drop(&mut self)

Drops this FutureRwGuard.

Blocks the current thread until the command associated with this FutureRwGuard (represented by the command completion event) completes. This ensures that the underlying Vec is not dropped before the command completes (which would cause obvious problems).