Struct rustacuda::memory::DeviceSlice [−][src]
#[repr(C)]pub struct DeviceSlice<T>(_);
Expand description
Fixed-size device-side slice.
Implementations
Returns the number of elements in the slice.
Examples
use rustacuda::memory::*; let a = DeviceBuffer::from_slice(&[1, 2, 3]).unwrap(); assert_eq!(a.len(), 3);
Returns true
if the slice has a length of 0.
Examples
use rustacuda::memory::*; let a : DeviceBuffer<u64> = unsafe { DeviceBuffer::uninitialized(0).unwrap() }; assert!(a.is_empty());
Return a raw device-pointer to the slice’s buffer.
The caller must ensure that the slice outlives the pointer this function returns, or else it will end up pointing to garbage. The caller must also ensure that the pointer is not dereferenced by the CPU.
Examples:
use rustacuda::memory::*; let a = DeviceBuffer::from_slice(&[1, 2, 3]).unwrap(); println!("{:p}", a.as_ptr());
Returns an unsafe mutable device-pointer to the slice’s buffer.
The caller must ensure that the slice outlives the pointer this function returns, or else it will end up pointing to garbage. The caller must also ensure that the pointer is not dereferenced by the CPU.
Examples:
use rustacuda::memory::*; let mut a = DeviceBuffer::from_slice(&[1, 2, 3]).unwrap(); println!("{:p}", a.as_mut_ptr());
Divides one DeviceSlice into two at a given index.
The first will contain all indices from [0, mid)
(excluding the index mid
itself) and
the second will contain all indices from [mid, len)
(excluding the index len
itself).
Panics
Panics if min > len
.
Examples:
use rustacuda::memory::*; let buf = DeviceBuffer::from_slice(&[0u64, 1, 2, 3, 4, 5]).unwrap(); let (left, right) = buf.split_at(3); let mut left_host = [0u64, 0, 0]; let mut right_host = [0u64, 0, 0]; left.copy_to(&mut left_host).unwrap(); right.copy_to(&mut right_host).unwrap(); assert_eq!([0u64, 1, 2], left_host); assert_eq!([3u64, 4, 5], right_host);
Divides one mutable DeviceSlice into two at a given index.
The first will contain all indices from [0, mid)
(excluding the index mid
itself) and
the second will contain all indices from [mid, len)
(excluding the index len
itself).
Panics
Panics if min > len
.
Examples:
use rustacuda::memory::*; let mut buf = DeviceBuffer::from_slice(&[0u64, 0, 0, 0, 0, 0]).unwrap(); { let (left, right) = buf.split_at_mut(3); let left_host = [0u64, 1, 2]; let right_host = [3u64, 4, 5]; left.copy_from(&left_host).unwrap(); right.copy_from(&right_host).unwrap(); } let mut host_full = [0u64; 6]; buf.copy_to(&mut host_full).unwrap(); assert_eq!([0u64, 1, 2, 3, 4, 5], host_full);
pub fn chunks(&self, chunk_size: usize) -> DeviceChunks<'_, T>ⓘNotable traits for DeviceChunks<'a, T>impl<'a, T> Iterator for DeviceChunks<'a, T> type Item = &'a DeviceSlice<T>;
pub fn chunks(&self, chunk_size: usize) -> DeviceChunks<'_, T>ⓘNotable traits for DeviceChunks<'a, T>impl<'a, T> Iterator for DeviceChunks<'a, T> type Item = &'a DeviceSlice<T>;
impl<'a, T> Iterator for DeviceChunks<'a, T> type Item = &'a DeviceSlice<T>;
Returns an iterator over chunk_size
elements of the slice at a time. The chunks are device
slices and do not overlap. If chunk_size
does not divide the length of the slice, then the
last chunk will not have length chunk_size
.
See exact_chunks
for a variant of this iterator that returns chunks of always exactly
chunk_size
elements.
Panics
Panics if chunk_size
is 0.
Examples
use rustacuda::memory::*; let slice = DeviceBuffer::from_slice(&[1u64, 2, 3, 4, 5]).unwrap(); let mut iter = slice.chunks(2); assert_eq!(iter.next().unwrap().len(), 2); let mut host_buf = [0u64, 0]; iter.next().unwrap().copy_to(&mut host_buf).unwrap(); assert_eq!([3, 4], host_buf); assert_eq!(iter.next().unwrap().len(), 1);
pub fn chunks_mut(&mut self, chunk_size: usize) -> DeviceChunksMut<'_, T>ⓘNotable traits for DeviceChunksMut<'a, T>impl<'a, T> Iterator for DeviceChunksMut<'a, T> type Item = &'a mut DeviceSlice<T>;
pub fn chunks_mut(&mut self, chunk_size: usize) -> DeviceChunksMut<'_, T>ⓘNotable traits for DeviceChunksMut<'a, T>impl<'a, T> Iterator for DeviceChunksMut<'a, T> type Item = &'a mut DeviceSlice<T>;
impl<'a, T> Iterator for DeviceChunksMut<'a, T> type Item = &'a mut DeviceSlice<T>;
Returns an iterator over chunk_size
elements of the slice at a time. The chunks are
mutable device slices and do not overlap. If chunk_size
does not divide the length of the
slice, then the last chunk will not have length chunk_size
.
See exact_chunks
for a variant of this iterator that returns chunks of always exactly
chunk_size
elements.
Panics
Panics if chunk_size
is 0.
Examples
use rustacuda::memory::*; let mut slice = DeviceBuffer::from_slice(&[0u64, 0, 0, 0, 0]).unwrap(); { let mut iter = slice.chunks_mut(2); assert_eq!(iter.next().unwrap().len(), 2); let host_buf = [2u64, 3]; iter.next().unwrap().copy_from(&host_buf).unwrap(); assert_eq!(iter.next().unwrap().len(), 1); } let mut host_buf = [0u64, 0, 0, 0, 0]; slice.copy_to(&mut host_buf).unwrap(); assert_eq!([0u64, 0, 2, 3, 0], host_buf);
Returns a DevicePointer<T>
to the buffer.
The caller must ensure that the buffer outlives the returned pointer, or it will end up pointing to garbage.
Modifying DeviceBuffer
is guaranteed not to cause its buffer to be reallocated, so pointers
cannot be invalidated in that manner, but other types may be added in the future which can
reallocate.
Forms a slice from a DevicePointer
and a length.
The len
argument is the number of elements, not the number of bytes.
Safety
This function is unsafe as there is no guarantee that the given pointer is valid for len
elements, nor whether the lifetime inferred is a suitable lifetime for the returned slice.
Caveat
The lifetime for the returned slice is inferred from its usage. To prevent accidental misuse, it’s suggested to tie the lifetime to whatever source lifetime is safe in the context, such as by providing a helper function taking the lifetime of a host value for the slice or by explicit annotation.
Examples
use rustacuda::memory::*; let mut x = DeviceBuffer::from_slice(&[0u64, 1, 2, 3, 4, 5]).unwrap(); // Manually slice the buffer (this is not recommended!) let ptr = unsafe { x.as_device_ptr().offset(1) }; let slice = unsafe { DeviceSlice::from_raw_parts(ptr, 2) }; let mut host_buf = [0u64, 0]; slice.copy_to(&mut host_buf).unwrap(); assert_eq!([1u64, 2], host_buf);
pub unsafe fn from_raw_parts_mut<'a>(
data: DevicePointer<T>,
len: usize
) -> &'a mut DeviceSlice<T>
pub unsafe fn from_raw_parts_mut<'a>(
data: DevicePointer<T>,
len: usize
) -> &'a mut DeviceSlice<T>
Performs the same functionality as from_raw_parts
, except that a
mutable slice is returned.
Safety
This function is unsafe as there is no guarantee that the given pointer is valid for len
elements, nor whether the lifetime inferred is a suitable lifetime for the returned slice.
This function is unsafe as there is no guarantee that the given pointer is valid for len
elements, not whether the lifetime inferred is a suitable lifetime for the returned slice,
as well as not being able to provide a non-aliasing guarantee of the returned
mutable slice. data
must be non-null and aligned even for zero-length
slices as with from_raw_parts
.
See the documentation of from_raw_parts
for more details.
Trait Implementations
unsafe fn async_copy_from(
&mut self,
val: &DeviceBuffer<T>,
stream: &Stream
) -> CudaResult<()>
unsafe fn async_copy_from(
&mut self,
val: &DeviceBuffer<T>,
stream: &Stream
) -> CudaResult<()>
Asynchronously copy data from source
. source
must be the same size as self
. Read more
Asynchronously copy data to dest
. dest
must be the same size as self
. Read more
impl<T: DeviceCopy, I: AsRef<[T]> + AsMut<[T]> + ?Sized> AsyncCopyDestination<I> for DeviceSlice<T>
impl<T: DeviceCopy, I: AsRef<[T]> + AsMut<[T]> + ?Sized> AsyncCopyDestination<I> for DeviceSlice<T>
type Output = DeviceSlice<T>
type Output = DeviceSlice<T>
The returned type after indexing.
type Output = DeviceSlice<T>
type Output = DeviceSlice<T>
The returned type after indexing.