[]Struct rustacuda::memory::DevicePointer

#[repr(transparent)]pub struct DevicePointer<T>(_)
where
    T: ?Sized
;

A pointer to device memory.

DevicePointer cannot be dereferenced by the CPU, as it is a pointer to a memory allocation in the device. It can be safely copied to the device (eg. as part of a kernel launch) and either unwrapped or transmuted to an appropriate pointer.

DevicePointer is guaranteed to have an equivalent internal representation to a raw pointer. Thus, it can be safely reinterpreted or transmuted to *mut T. It is safe to pass a DevicePointer through an FFI boundary to C code expecting a *mut T, so long as the code on the other side of that boundary does not attempt to dereference the pointer on the CPU. It is thus possible to pass a DevicePointer to a CUDA kernel written in C.

Implementations

impl<T> DevicePointer<T> where
    T: ?Sized

pub unsafe fn wrap(ptr: *mut T) -> DevicePointer<T>

Wrap the given raw pointer in a DevicePointer. The given pointer is assumed to be a valid, device pointer or null.

Safety

The given pointer must have been allocated with cuda_malloc or be null.

Examples

use rustacuda::memory::*;
use std::ptr;
unsafe {
    let null : *mut u64 = ptr::null_mut();
    assert!(DevicePointer::wrap(null).is_null());
}

pub fn as_raw(self) -> *const T

Returns the contained pointer as a raw pointer. The returned pointer is not valid on the CPU and must not be dereferenced.

Examples

use rustacuda::memory::*;
unsafe {
    let dev_ptr = cuda_malloc::<u64>(1).unwrap();
    let ptr: *const u64 = dev_ptr.as_raw();
    cuda_free(dev_ptr);
}

pub fn as_raw_mut(&mut self) -> *mut T

Returns the contained pointer as a mutable raw pointer. The returned pointer is not valid on the CPU and must not be dereferenced.

Examples

use rustacuda::memory::*;
unsafe {
    let mut dev_ptr = cuda_malloc::<u64>(1).unwrap();
    let ptr: *mut u64 = dev_ptr.as_raw_mut();
    cuda_free(dev_ptr);
}

pub fn is_null(self) -> bool

Returns true if the pointer is null.

Examples

use rustacuda::memory::*;
use std::ptr;
unsafe {
    let null : *mut u64 = ptr::null_mut();
    assert!(DevicePointer::wrap(null).is_null());
}

pub fn null() -> DevicePointer<T>

Returns a null device pointer.

Examples:

use rustacuda::memory::*;
let ptr : DevicePointer<u64> = DevicePointer::null();
assert!(ptr.is_null());

pub unsafe fn offset(self, count: isize) -> DevicePointer<T>

Calculates the offset from a device pointer.

count is in units of T; eg. a count of 3 represents a pointer offset of 3 * size_of::<T>() bytes.

Safety

If any of the following conditions are violated, the result is Undefined Behavior:

  • Both the starting and resulting pointer must be either in bounds or one byte past the end of the same allocated object.

  • The computed offset, in bytes, cannot overflow an isize.

  • The offset being in bounds cannot rely on "wrapping around" the address space. That is, the infinite-precision sum, in bytes must fit in a usize.

Consider using wrapping_offset instead if these constraints are difficult to satisfy. The only advantage of this method is that it enables more aggressive compiler optimizations.

Examples

use rustacuda::memory::*;
unsafe {
    let mut dev_ptr = cuda_malloc::<u64>(5).unwrap();
    let offset = dev_ptr.offset(1); // Points to the 2nd u64 in the buffer
    cuda_free(dev_ptr); // Must free the buffer using the original pointer
}

pub fn wrapping_offset(self, count: isize) -> DevicePointer<T>

Calculates the offset from a device pointer using wrapping arithmetic.

count is in units of T; eg. a count of 3 represents a pointer offset of 3 * size_of::<T>() bytes.

Safety

The resulting pointer does not need to be in bounds, but it is potentially hazardous to dereference (which requires unsafe). In particular, the resulting pointer may not be used to access a different allocated object than the one self points to. In other words, x.wrapping_offset(y.wrapping_offset_from(x)) is not the same as y, and dereferencing it is undefined behavior unless x and y point into the same allocated object.

Always use .offset(count) instead when possible, because offset allows the compiler to optimize better. If you need to cross object boundaries, cast the pointer to an integer and do the arithmetic there.

Examples

use rustacuda::memory::*;
unsafe {
    let mut dev_ptr = cuda_malloc::<u64>(5).unwrap();
    let offset = dev_ptr.wrapping_offset(1); // Points to the 2nd u64 in the buffer
    cuda_free(dev_ptr); // Must free the buffer using the original pointer
}

pub unsafe fn add(self, count: usize) -> DevicePointer<T>

Calculates the offset from a pointer (convenience for .offset(count as isize)).

count is in units of T; e.g. a count of 3 represents a pointer offset of 3 * size_of::<T>() bytes.

Safety

If any of the following conditions are violated, the result is Undefined Behavior:

  • Both the starting and resulting pointer must be either in bounds or one byte past the end of an allocated object.

  • The computed offset, in bytes, cannot overflow an isize.

  • The offset being in bounds cannot rely on "wrapping around" the address space. That is, the infinite-precision sum must fit in a usize.

Consider using wrapping_offset instead if these constraints are difficult to satisfy. The only advantage of this method is that it enables more aggressive compiler optimizations.

Examples

use rustacuda::memory::*;
unsafe {
    let mut dev_ptr = cuda_malloc::<u64>(5).unwrap();
    let offset = dev_ptr.add(1); // Points to the 2nd u64 in the buffer
    cuda_free(dev_ptr); // Must free the buffer using the original pointer
}

pub unsafe fn sub(self, count: usize) -> DevicePointer<T>

Calculates the offset from a pointer (convenience for .offset((count as isize).wrapping_neg())).

count is in units of T; e.g. a count of 3 represents a pointer offset of 3 * size_of::<T>() bytes.

Safety

If any of the following conditions are violated, the result is Undefined Behavior:

  • Both the starting and resulting pointer must be either in bounds or one byte past the end of an allocated object.

  • The computed offset, in bytes, cannot overflow an isize.

  • The offset being in bounds cannot rely on "wrapping around" the address space. That is, the infinite-precision sum must fit in a usize.

Consider using wrapping_offset instead if these constraints are difficult to satisfy. The only advantage of this method is that it enables more aggressive compiler optimizations.

Examples

use rustacuda::memory::*;
unsafe {
    let mut dev_ptr = cuda_malloc::<u64>(5).unwrap();
    let offset = dev_ptr.add(4).sub(3); // Points to the 2nd u64 in the buffer
    cuda_free(dev_ptr); // Must free the buffer using the original pointer
}

pub fn wrapping_add(self, count: usize) -> DevicePointer<T>

Calculates the offset from a pointer using wrapping arithmetic. (convenience for .wrapping_offset(count as isize))

count is in units of T; e.g. a count of 3 represents a pointer offset of 3 * size_of::<T>() bytes.

Safety

The resulting pointer does not need to be in bounds, but it is potentially hazardous to dereference.

Always use .add(count) instead when possible, because add allows the compiler to optimize better.

Examples

use rustacuda::memory::*;
unsafe {
    let mut dev_ptr = cuda_malloc::<u64>(5).unwrap();
    let offset = dev_ptr.wrapping_add(1); // Points to the 2nd u64 in the buffer
    cuda_free(dev_ptr); // Must free the buffer using the original pointer
}

pub fn wrapping_sub(self, count: usize) -> DevicePointer<T>

Calculates the offset from a pointer using wrapping arithmetic. (convenience for .wrapping_offset((count as isize).wrapping_sub()))

count is in units of T; e.g. a count of 3 represents a pointer offset of 3 * size_of::<T>() bytes.

Safety

The resulting pointer does not need to be in bounds, but it is potentially hazardous to dereference (which requires unsafe).

Always use .sub(count) instead when possible, because sub allows the compiler to optimize better.

Examples

use rustacuda::memory::*;
unsafe {
    let mut dev_ptr = cuda_malloc::<u64>(5).unwrap();
    let offset = dev_ptr.wrapping_add(4).wrapping_sub(3); // Points to the 2nd u64 in the buffer
    cuda_free(dev_ptr); // Must free the buffer using the original pointer
}

Trait Implementations

impl<T> Clone for DevicePointer<T> where
    T: ?Sized

impl<T> Copy for DevicePointer<T> where
    T: ?Sized

impl<T> Debug for DevicePointer<T> where
    T: ?Sized

impl<T> DeviceCopy for DevicePointer<T> where
    T: ?Sized

impl<T> Eq for DevicePointer<T> where
    T: ?Sized

impl<T> Hash for DevicePointer<T> where
    T: ?Sized

impl<T> Ord for DevicePointer<T> where
    T: ?Sized

impl<T> PartialEq<DevicePointer<T>> for DevicePointer<T> where
    T: ?Sized

impl<T> PartialOrd<DevicePointer<T>> for DevicePointer<T> where
    T: ?Sized

impl<T> Pointer for DevicePointer<T> where
    T: ?Sized

Auto Trait Implementations

impl<T: ?Sized> RefUnwindSafe for DevicePointer<T> where
    T: RefUnwindSafe

impl<T> !Send for DevicePointer<T>

impl<T> !Sync for DevicePointer<T>

impl<T: ?Sized> Unpin for DevicePointer<T>

impl<T: ?Sized> UnwindSafe for DevicePointer<T> where
    T: RefUnwindSafe

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

impl<T> ToOwned for T where
    T: Clone
[src]

type Owned = T

The resulting type after obtaining ownership.

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.