Struct Event 

pub struct Event(/* private fields */);

An event to track work submitted to a stream.

See the module-level documentation for more information.

Implementations

impl Event

pub fn new(flags: EventFlags) -> CudaResult<Self>

Create a new event with the specified flags.

Example

use rustacuda::event::{Event, EventFlags};

// With default settings
let event = Event::new(EventFlags::DEFAULT)?;

pub fn record(&self, stream: &Stream) -> CudaResult<()>

Add the event to the given stream of work. The event will be completed when the stream completes all previously-submitted work and reaches the event in the queue.

This function is used together with query, synchronize, and elapsed_time_f32. See the respective functions for more information.

If the event is created with EventFlags::BLOCKING_SYNC, then record blocks until the event has actually been recorded.

Errors

If the event and stream are not from the same context, an error is returned.

Example

use rustacuda::event::{Event, EventFlags};

let stream = Stream::new(StreamFlags::NON_BLOCKING, None)?;
let event = Event::new(EventFlags::DEFAULT)?;

// submit some work ...

event.record(&stream)?;
}

pub fn query(&self) -> CudaResult<EventStatus>

Return whether the stream this event was recorded on (see record) has processed this event yet or not. A return value of EventStatus::Ready indicates that all work submitted before the event has been completed.

Example

use rustacuda::event::{Event, EventFlags, EventStatus};

let stream = Stream::new(StreamFlags::NON_BLOCKING, None)?;
let event = Event::new(EventFlags::DEFAULT)?;

// do some work ...

// record an event
event.record(&stream)?;

// ... wait some time ...

// query if the work is finished
let status = event.query()?;
assert_eq!(status, EventStatus::Ready);
}

pub fn synchronize(&self) -> CudaResult<()>

Wait for an event to complete.

Blocks thread execution until all work submitted before the event was recorded has completed. EventFlags::BLOCKING_SYNC controls the mode of blocking. If the flag is set on event creation, the thread will sleep. Otherwise, the thread will busy-wait.

Example

use rustacuda::event::{Event, EventFlags};

let stream = Stream::new(StreamFlags::NON_BLOCKING, None)?;
let event = Event::new(EventFlags::DEFAULT)?;

// do some work ...

// record an event
event.record(&stream)?;

// wait until the work is finished
event.synchronize()?;
}

pub fn elapsed_time_f32(&self, start: &Self) -> CudaResult<f32>

Return the duration between two events.

The duration is computed in milliseconds with a resolution of approximately 0.5 microseconds. This can be used to measure the duration of work queued in between the two events.

Errors

CudaError::NotReady is returned if either event is not yet complete.

CudaError::InvalidHandle is returned if

• the two events are not from the same context, or if
• record has not been called on either event, or if
• the DISABLE_TIMING flag is set on either event.

Example

use rustacuda::event::{Event, EventFlags};

let stream = Stream::new(StreamFlags::NON_BLOCKING, None)?;
let start_event = Event::new(EventFlags::DEFAULT)?;
let stop_event = Event::new(EventFlags::DEFAULT)?;

// start recording time
start_event.record(&stream)?;

// do some work ...

// stop recording time
stop_event.record(&stream)?;

// wait for the work to complete
stop_event.synchronize()?;

// compute the time elapsed between the start and stop events
let time = stop_event.elapsed_time_f32(&start_event)?;

}

pub fn drop(event: Event) -> DropResult<Event>

Destroy an Event returning an error.

Destroying an event can return errors from previous asynchronous work. This function destroys the given event and returns the error and the un-destroyed event on failure.

Example

use rustacuda::event::{Event, EventFlags};

let event = Event::new(EventFlags::DEFAULT)?;
match Event::drop(event) {
    Ok(()) => println!("Successfully destroyed"),
    Err((cuda_error, event)) => {
        println!("Failed to destroy event: {:?}", cuda_error);
        // Do something with event
    },
}

Trait Implementations

impl Debug for Event

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

Formats the value using the given formatter.

impl Drop for Event

fn drop(&mut self)

Executes the destructor for this type.