Struct ocl::Event

#[repr(C)]
#[must_use = "futures do nothing unless polled"]
pub struct Event(_);

An event representing a command or user created event.

Methods

impl Event

pub fn empty() -> Event

Creates a new, empty (null) event which must be filled by a command, associating the event with it.

pub fn user<C: ClContextPtr>(context: C) -> OclResult<Event>

Creates a new, empty event which must be filled by a newly initiated command, associating the event with it.

pub fn is_empty(&self) -> bool

Returns true if this event is 'empty' and has not yet been associated with a command.

pub fn set_unpark_callback(&self) -> OclResult<()>

Sets a callback function to trigger upon completion of this event which will unpark the current task.

To be used within the context of a futures task.

Panics

This function will panic if a task is not currently being executed. That is, this method can be dangerous to call outside of an implementation of poll.

pub unsafe fn register_event_relay(&self, user_event: Event) -> OclResult<()>

Registers a user event to have its status set to complete (CommandExecutionStatus::Complete) immediately upon completion of this event.

Deadlocks

Due to the nature of OpenCL queue implementations, care must be taken when using this function. OpenCL queue deadlocks may occur.

OpenCL queues generally use one thread per queue for the purposes of callbacks, etc. As a rule of thumb, ensure that any OpenCL commands preceding the causation/source event (self) are in a separate queue from any commands with the dependent/target event (user_event).

Safety

The caller must ensure that user_event was created with Event::user() and that it's status is CommandExecutionStatus::Submitted (the default upon creation).

pub fn info(&self, info_kind: EventInfo) -> OclResult<EventInfoResult>

Returns info about the event.

pub fn profiling_info(     &self,     info_kind: ProfilingInfo ) -> OclResult<ProfilingInfoResult>

Returns info about the event.

pub fn queue_core(&self) -> OclResult<CommandQueueCore>

Returns this event's associated command queue.

pub fn as_core(&self) -> &EventCore

Returns a reference to the core pointer wrapper, usable by functions in the core module.

pub fn into_raw(self) -> cl_event

Consumes the Event, returning the wrapped cl_event pointer.

To avoid a memory leak the pointer must be converted back to an Event using Event::from_raw.

pub unsafe fn from_raw(ptr: cl_event) -> Event

Constructs an Event from a raw cl_event pointer.

The raw pointer must have been previously returned by a call to a Event::into_raw.

Methods from Deref<Target = EventCore>

pub fn set_complete(&self) -> Result<(), Error>

Sets this user created event to CommandExecutionStatus::Complete.

Will return an error if this event is not a 'user' event (created with ::user()).

pub fn is_complete(&self) -> Result<bool, Error>

Queries the command status associated with this event and returns true if it is complete, false if incomplete or upon error.

This is the fastest possible way to determine event status.

pub fn wait_for(&self) -> Result<(), Error>

Causes the command queue to wait until this event is complete before returning.

pub fn is_null(&self) -> bool

Returns whether or not this event is associated with a command or is a user event.

pub fn is_valid(&self) -> bool

[FIXME]: ADD VALIDITY CHECK BY CALLING '_INFO' OR SOMETHING: NULL CHECK IS NOT ENOUGH

This still leads to crazy segfaults when non-event pointers (random whatever addresses) are passed. Need better check.

pub unsafe fn set_callback(     &self,     callback_receiver: extern "C" fn(*mut c_void, i32, *mut c_void),     user_data_ptr: *mut c_void ) -> Result<(), Error>

Sets a callback function, callback_receiver, to trigger upon completion of this event with an optional pointer to user data.

The callback function must have a signature matching: extern "C" fn (ffi::cl_event, i32, *mut libc::c_void)

Safety

user_data must be guaranteed to still exist if and when callback_receiver is ever called.

TODO: Create a safer type wrapper for callback_receiver (using an Arc?, etc.) within ocl.

pub fn context(&self) -> Result<Context, Error>

Returns the Context associated with this event.

pub unsafe fn as_ptr_ref(&self) -> &*mut c_void

Returns an immutable reference to a pointer, do not deref and store it unless you will manage its associated reference count carefully.

Warning

DO NOT store this pointer.

DO NOT send this pointer across threads unless you are incrementing the reference count before sending and decrementing after sending.

Use ::into_raw for these purposes. Thank you.

pub unsafe fn as_ptr_mut(&mut self) -> &mut *mut c_void

Returns a mutable reference to a pointer, do not deref then modify or store it unless you will manage its associated reference count carefully.

Warning

DO NOT store this pointer.

DO NOT send this pointer across threads unless you are incrementing the reference count before sending and decrementing after sending.

Use ::into_raw for these purposes. Thank you.

Trait Implementations

impl Clone for Event

fn clone(&self) -> Event

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Event

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

Formats the value using the given formatter.

impl Hash for Event

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where     H: Hasher,

Feeds a slice of this type into the given [Hasher].

impl PartialEq for Event

fn eq(&self, other: &Event) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Event) -> bool

This method tests for !=.

impl Eq for Event

impl From<EventCore> for Event

fn from(ev: EventCore) -> Event

Performs the conversion.

impl From<Event> for EventCore

fn from(ev: Event) -> EventCore

Performs the conversion.

impl Default for Event

fn default() -> Event

Returns the "default value" for a type.

impl Deref for Event

type Target = EventCore

The resulting type after dereferencing.

fn deref(&self) -> &EventCore

Dereferences the value.

impl DerefMut for Event

fn deref_mut(&mut self) -> &mut EventCore

Mutably dereferences the value.

impl AsRef<EventCore> for Event

fn as_ref(&self) -> &EventCore

Performs the conversion.

impl Display for Event

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

Formats the value using the given formatter.

impl<'e> ClEventPtrRef<'e> for Event

unsafe fn as_ptr_ref(&'e self) -> &'e cl_event

impl<'a> ClNullEventPtr for &'a mut Event

fn alloc_new(&mut self) -> *mut cl_event

unsafe fn clone_from<E: AsRef<EventCore>>(&mut self, ev: E)

impl ClWaitListPtr for Event

unsafe fn as_ptr_ptr(&self) -> *const cl_event

Returns a pointer to the first pointer in this list.

fn count(&self) -> u32

Returns the number of items in this wait list.

impl<'a> ClWaitListPtr for &'a Event

unsafe fn as_ptr_ptr(&self) -> *const cl_event

Returns a pointer to the first pointer in this list.

fn count(&self) -> u32

Returns the number of items in this wait list.

impl Future for Event

type Item = ()

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

type Error = OclError

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 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 as IntoFuture>::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 as IntoFuture>::Future> where     B: IntoFuture,

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

fn join<B>(self, other: B) -> Join<Self, <B as IntoFuture>::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 as IntoFuture>::Future, <C as IntoFuture>::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 as IntoFuture>::Future, <C as IntoFuture>::Future, <D as IntoFuture>::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 as IntoFuture>::Future, <C as IntoFuture>::Future, <D as IntoFuture>::Future, <E as IntoFuture>::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 as IntoFuture>::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 as Stream>::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 inspect<F>(self, f: F) -> Inspect<Self, F> where     F: FnOnce(&Self::Item),

Do something with the item of a future, passing it on.

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<'a> From<Event> for EventArray

fn from(event: Event) -> EventArray

Performs the conversion.

impl<'a> From<Event> for EventList

fn from(event: Event) -> EventList

Performs the conversion.

impl<'a> From<Event> for ClWaitListPtrEnum<'a>

fn from(e: Event) -> ClWaitListPtrEnum<'a>

Performs the conversion.

impl<'a> From<&'a Event> for ClWaitListPtrEnum<'a>

fn from(e: &'a Event) -> ClWaitListPtrEnum<'a>

Performs the conversion.

impl<'a> From<&'a mut Event> for ClWaitListPtrEnum<'a>

fn from(e: &'a mut Event) -> ClWaitListPtrEnum<'a>

Performs the conversion.

impl<'a> From<&'a mut Event> for ClNullEventPtrEnum<'a>

fn from(e: &'a mut Event) -> ClNullEventPtrEnum<'a>

Performs the conversion.