cudaError_t cudaMemcpy3DAsync	(	const struct cudaMemcpy3DParms *	p,
		cudaStream_t	stream = `0`
	)

struct cudaExtent {
  size_t width;
  size_t height;
  size_t depth;
};
struct cudaExtent make_cudaExtent(size_t w, size_t h, size_t d);

struct cudaPos {
  size_t x;
  size_t y;
  size_t z;
};
struct cudaPos make_cudaPos(size_t x, size_t y, size_t z);

struct cudaMemcpy3DParms {
  struct cudaArray     *srcArray;
  struct cudaPos        srcPos;
  struct cudaPitchedPtr srcPtr;
  struct cudaArray     *dstArray;
  struct cudaPos        dstPos;
  struct cudaPitchedPtr dstPtr;
  struct cudaExtent     extent;
  enum cudaMemcpyKind   kind;
};

cudaMemcpy3DAsync() copies data betwen two 3D objects. The source and destination objects may be in either host memory, device memory, or a CUDA array. The source, destination, extent, and kind of copy performed is specified by the cudaMemcpy3DParms struct which should be initialized to zero before use:

cudaMemcpy3DParms myParms = {0};

The struct passed to cudaMemcpy3DAsync() must specify one of srcArray or srcPtr and one of dstArray or dstPtr. Passing more than one non-zero source or destination will cause cudaMemcpy3DAsync() to return an error.

The srcPos and dstPos fields are optional offsets into the source and destination objects and are defined in units of each object's elements. The element for a host or device pointer is assumed to be unsigned char. For CUDA arrays, positions must be in the range [0, 2048) for any dimension.

The extent field defines the dimensions of the transferred area in elements. If a CUDA array is participating in the copy, the extent is defined in terms of that array's elements. If no CUDA array is participating in the copy then the extents are defined in elements of unsigned char.

The kind field defines the direction of the copy. It must be one of cudaMemcpyHostToHost, cudaMemcpyHostToDevice, cudaMemcpyDeviceToHost, or cudaMemcpyDeviceToDevice.

If the source and destination are both arrays, cudaMemcpy3DAsync() will return an error if they do not have the same element size.

The source and destination object may not overlap. If overlapping source and destination objects are specified, undefined behavior will result.

The source object must lie entirely within the region defined by srcPos and extent. The destination object must lie entirely within the region defined by dstPos and extent.

cudaMemcpy3DAsync() returns an error if the pitch of srcPtr or dstPtr exceeds the maximum allowed. The pitch of a cudaPitchedPtr allocated with cudaMalloc3D() will always be valid.

cudaMemcpy3DAsync() is asynchronous with respect to the host, so the call may return before the copy is complete. It only works on page-locked host memory and returns an error if a pointer to pageable memory is passed as input. The copy can optionally be associated to a stream by passing a non-zero stream argument. If kind is cudaMemcpyHostToDevice or cudaMemcpyDeviceToHost and stream is non-zero, the copy may overlap with operations in other streams.

Parameters:

	p	- 3D memory copy parameters
	stream	- Stream identifier

Returns:: cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidDevicePointer, cudaErrorInvalidPitchValue, cudaErrorInvalidMemcpyDirection

Note:: Note that this function may also return error codes from previous, asynchronous launches.