Provided by: nvidia-cuda-dev_10.1.243-3_amd64 
NAME
External Resource Interoperability -
Functions
CUresult cuDestroyExternalMemory (CUexternalMemory extMem)
Destroys an external memory object.
CUresult cuDestroyExternalSemaphore (CUexternalSemaphore extSem)
Destroys an external semaphore.
CUresult cuExternalMemoryGetMappedBuffer (CUdeviceptr *devPtr, CUexternalMemory extMem, const
CUDA_EXTERNAL_MEMORY_BUFFER_DESC *bufferDesc)
Maps a buffer onto an imported memory object.
CUresult cuExternalMemoryGetMappedMipmappedArray (CUmipmappedArray *mipmap, CUexternalMemory extMem,
const CUDA_EXTERNAL_MEMORY_MIPMAPPED_ARRAY_DESC *mipmapDesc)
Maps a CUDA mipmapped array onto an external memory object.
CUresult cuImportExternalMemory (CUexternalMemory *extMem_out, const CUDA_EXTERNAL_MEMORY_HANDLE_DESC
*memHandleDesc)
Imports an external memory object.
CUresult cuImportExternalSemaphore (CUexternalSemaphore *extSem_out, const
CUDA_EXTERNAL_SEMAPHORE_HANDLE_DESC *semHandleDesc)
Imports an external semaphore.
CUresult cuSignalExternalSemaphoresAsync (const CUexternalSemaphore *extSemArray, const
CUDA_EXTERNAL_SEMAPHORE_SIGNAL_PARAMS *paramsArray, unsigned int numExtSems, CUstream stream)
Signals a set of external semaphore objects.
CUresult cuWaitExternalSemaphoresAsync (const CUexternalSemaphore *extSemArray, const
CUDA_EXTERNAL_SEMAPHORE_WAIT_PARAMS *paramsArray, unsigned int numExtSems, CUstream stream)
Waits on a set of external semaphore objects.
Detailed Description
\brief External resource interoperability functions of the low-level CUDA driver API (cuda.h)
This section describes the external resource interoperability functions of the low-level CUDA driver
application programming interface.
Function Documentation
CUresult cuDestroyExternalMemory (CUexternalMemory extMem)
Destroys the specified external memory object. Any existing buffers and CUDA mipmapped arrays mapped onto
this object must no longer be used and must be explicitly freed using cuMemFree and
cuMipmappedArrayDestroy respectively.
Parameters:
extMem - External memory object to be destroyed
Returns:
CUDA_SUCCESS, CUDA_ERROR_NOT_INITIALIZED, CUDA_ERROR_INVALID_HANDLE
Note:
Note that this function may also return error codes from previous, asynchronous launches.
See also:
cuImportExternalMemory cuExternalMemoryGetMappedBuffer, cuExternalMemoryGetMappedMipmappedArray
CUresult cuDestroyExternalSemaphore (CUexternalSemaphore extSem)
Destroys an external semaphore object and releases any references to the underlying resource. Any
outstanding signals or waits must have completed before the semaphore is destroyed.
Parameters:
extSem - External semaphore to be destroyed
Returns:
CUDA_SUCCESS, CUDA_ERROR_NOT_INITIALIZED, CUDA_ERROR_INVALID_HANDLE
Note:
Note that this function may also return error codes from previous, asynchronous launches.
See also:
cuImportExternalSemaphore, cuSignalExternalSemaphoresAsync, cuWaitExternalSemaphoresAsync
CUresult cuExternalMemoryGetMappedBuffer (CUdeviceptr * devPtr, CUexternalMemory extMem, const
CUDA_EXTERNAL_MEMORY_BUFFER_DESC * bufferDesc)
Maps a buffer onto an imported memory object and returns a device pointer in devPtr.
The properties of the buffer being mapped must be described in bufferDesc. The
CUDA_EXTERNAL_MEMORY_BUFFER_DESC structure is defined as follows:
typedef struct CUDA_EXTERNAL_MEMORY_BUFFER_DESC_st {
unsigned long long offset;
unsigned long long size;
unsigned int flags;
} CUDA_EXTERNAL_MEMORY_BUFFER_DESC;
where CUDA_EXTERNAL_MEMORY_BUFFER_DESC::offset is the offset in the memory object where the buffer's base
address is. CUDA_EXTERNAL_MEMORY_BUFFER_DESC::size is the size of the buffer.
CUDA_EXTERNAL_MEMORY_BUFFER_DESC::flags must be zero.
The offset and size have to be suitably aligned to match the requirements of the external API. Mapping
two buffers whose ranges overlap may or may not result in the same virtual address being returned for the
overlapped portion. In such cases, the application must ensure that all accesses to that region from the
GPU are volatile. Otherwise writes made via one address are not guaranteed to be visible via the other
address, even if they're issued by the same thread. It is recommended that applications map the combined
range instead of mapping separate buffers and then apply the appropriate offsets to the returned pointer
to derive the individual buffers.
The returned pointer devPtr must be freed using cuMemFree.
Parameters:
devPtr - Returned device pointer to buffer
extMem - Handle to external memory object
bufferDesc - Buffer descriptor
Returns:
CUDA_SUCCESS, CUDA_ERROR_NOT_INITIALIZED, CUDA_ERROR_INVALID_HANDLE
Note:
Note that this function may also return error codes from previous, asynchronous launches.
See also:
cuImportExternalMemory cuDestroyExternalMemory, cuExternalMemoryGetMappedMipmappedArray
CUresult cuExternalMemoryGetMappedMipmappedArray (CUmipmappedArray * mipmap, CUexternalMemory extMem, const
CUDA_EXTERNAL_MEMORY_MIPMAPPED_ARRAY_DESC * mipmapDesc)
Maps a CUDA mipmapped array onto an external object and returns a handle to it in mipmap.
The properties of the CUDA mipmapped array being mapped must be described in mipmapDesc. The structure
CUDA_EXTERNAL_MEMORY_MIPMAPPED_ARRAY_DESC is defined as follows:
typedef struct CUDA_EXTERNAL_MEMORY_MIPMAPPED_ARRAY_DESC_st {
unsigned long long offset;
CUDA_ARRAY3D_DESCRIPTOR arrayDesc;
unsigned int numLevels;
} CUDA_EXTERNAL_MEMORY_MIPMAPPED_ARRAY_DESC;
where CUDA_EXTERNAL_MEMORY_MIPMAPPED_ARRAY_DESC::offset is the offset in the memory object where the base
level of the mipmap chain is. CUDA_EXTERNAL_MEMORY_MIPMAPPED_ARRAY_DESC::arrayDesc describes the format,
dimensions and type of the base level of the mipmap chain. For further details on these parameters,
please refer to the documentation for cuMipmappedArrayCreate. Note that if the mipmapped array is bound
as a color target in the graphics API, then the flag CUDA_ARRAY3D_COLOR_ATTACHMENT must be specified in
CUDA_EXTERNAL_MEMORY_MIPMAPPED_ARRAY_DESC::arrayDesc::Flags.
CUDA_EXTERNAL_MEMORY_MIPMAPPED_ARRAY_DESC::numLevels specifies the total number of levels in the mipmap
chain.
The returned CUDA mipmapped array must be freed using cuMipmappedArrayDestroy.
Parameters:
mipmap - Returned CUDA mipmapped array
extMem - Handle to external memory object
mipmapDesc - CUDA array descriptor
Returns:
CUDA_SUCCESS, CUDA_ERROR_NOT_INITIALIZED, CUDA_ERROR_INVALID_HANDLE
Note:
Note that this function may also return error codes from previous, asynchronous launches.
See also:
cuImportExternalMemory cuDestroyExternalMemory, cuExternalMemoryGetMappedBuffer
CUresult cuImportExternalMemory (CUexternalMemory * extMem_out, const CUDA_EXTERNAL_MEMORY_HANDLE_DESC *
memHandleDesc)
Imports an externally allocated memory object and returns a handle to that in extMem_out.
The properties of the handle being imported must be described in memHandleDesc. The
CUDA_EXTERNAL_MEMORY_HANDLE_DESC structure is defined as follows:
typedef struct CUDA_EXTERNAL_MEMORY_HANDLE_DESC_st {
CUexternalMemoryHandleType type;
union {
int fd;
struct {
void *handle;
const void *name;
} win32;
} handle;
unsigned long long size;
unsigned int flags;
} CUDA_EXTERNAL_MEMORY_HANDLE_DESC;
where CUDA_EXTERNAL_MEMORY_HANDLE_DESC::type specifies the type of handle being imported.
CUexternalMemoryHandleType is defined as:
typedef enum CUexternalMemoryHandleType_enum {
CU_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_FD = 1,
CU_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_WIN32 = 2,
CU_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_WIN32_KMT = 3,
CU_EXTERNAL_MEMORY_HANDLE_TYPE_D3D12_HEAP = 4,
CU_EXTERNAL_MEMORY_HANDLE_TYPE_D3D12_RESOURCE = 5
} CUexternalMemoryHandleType;
If CUDA_EXTERNAL_MEMORY_HANDLE_DESC::type is CU_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_FD, then
CUDA_EXTERNAL_MEMORY_HANDLE_DESC::handle::fd must be a valid file descriptor referencing a memory object.
Ownership of the file descriptor is transferred to the CUDA driver when the handle is imported
successfully. Performing any operations on the file descriptor after it is imported results in undefined
behavior.
If CUDA_EXTERNAL_MEMORY_HANDLE_DESC::type is CU_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_WIN32, then exactly
one of CUDA_EXTERNAL_MEMORY_HANDLE_DESC::handle::win32::handle and
CUDA_EXTERNAL_MEMORY_HANDLE_DESC::handle::win32::name must not be NULL. If
CUDA_EXTERNAL_MEMORY_HANDLE_DESC::handle::win32::handle is not NULL, then it must represent a valid
shared NT handle that references a memory object. Ownership of this handle is not transferred to CUDA
after the import operation, so the application must release the handle using the appropriate system call.
If CUDA_EXTERNAL_MEMORY_HANDLE_DESC::handle::win32::name is not NULL, then it must point to a NULL-
terminated array of UTF-16 characters that refers to a memory object.
If CUDA_EXTERNAL_MEMORY_HANDLE_DESC::type is CU_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_WIN32_KMT, then
CUDA_EXTERNAL_MEMORY_HANDLE_DESC::handle::win32::handle must be non-NULL and
CUDA_EXTERNAL_MEMORY_HANDLE_DESC::handle::win32::name must be NULL. The handle specified must be a
globally shared KMT handle. This handle does not hold a reference to the underlying object, and thus will
be invalid when all references to the memory object are destroyed.
If CUDA_EXTERNAL_MEMORY_HANDLE_DESC::type is CU_EXTERNAL_MEMORY_HANDLE_TYPE_D3D12_HEAP, then exactly one
of CUDA_EXTERNAL_MEMORY_HANDLE_DESC::handle::win32::handle and
CUDA_EXTERNAL_MEMORY_HANDLE_DESC::handle::win32::name must not be NULL. If
CUDA_EXTERNAL_MEMORY_HANDLE_DESC::handle::win32::handle is not NULL, then it must represent a valid
shared NT handle that is returned by ID3DDevice::CreateSharedHandle when referring to a ID3D12Heap
object. This handle holds a reference to the underlying object. If
CUDA_EXTERNAL_MEMORY_HANDLE_DESC::handle::win32::name is not NULL, then it must point to a NULL-
terminated array of UTF-16 characters that refers to a ID3D12Heap object.
If CUDA_EXTERNAL_MEMORY_HANDLE_DESC::type is CU_EXTERNAL_MEMORY_HANDLE_TYPE_D3D12_RESOURCE, then exactly
one of CUDA_EXTERNAL_MEMORY_HANDLE_DESC::handle::win32::handle and
CUDA_EXTERNAL_MEMORY_HANDLE_DESC::handle::win32::name must not be NULL. If
CUDA_EXTERNAL_MEMORY_HANDLE_DESC::handle::win32::handle is not NULL, then it must represent a valid
shared NT handle that is returned by ID3DDevice::CreateSharedHandle when referring to a ID3D12Resource
object. This handle holds a reference to the underlying object. If
CUDA_EXTERNAL_MEMORY_HANDLE_DESC::handle::win32::name is not NULL, then it must point to a NULL-
terminated array of UTF-16 characters that refers to a ID3D12Resource object.
The size of the memory object must be specified in CUDA_EXTERNAL_MEMORY_HANDLE_DESC::size.
Specifying the flag CUDA_EXTERNAL_MEMORY_DEDICATED in CUDA_EXTERNAL_MEMORY_HANDLE_DESC::flags indicates
that the resource is a dedicated resource. The definition of what a dedicated resource is outside the
scope of this extension.
Parameters:
extMem_out - Returned handle to an external memory object
memHandleDesc - Memory import handle descriptor
Returns:
CUDA_SUCCESS, CUDA_ERROR_NOT_INITIALIZED, CUDA_ERROR_INVALID_HANDLE
Note:
Note that this function may also return error codes from previous, asynchronous launches.
If the Vulkan memory imported into CUDA is mapped on the CPU then the application must use
vkInvalidateMappedMemoryRanges/vkFlushMappedMemoryRanges as well as appropriate Vulkan pipeline
barriers to maintain coherence between CPU and GPU. For more information on these APIs, please refer
to 'Synchronization and Cache Control' chapter from Vulkan specification.
See also:
cuDestroyExternalMemory, cuExternalMemoryGetMappedBuffer, cuExternalMemoryGetMappedMipmappedArray
CUresult cuImportExternalSemaphore (CUexternalSemaphore * extSem_out, const
CUDA_EXTERNAL_SEMAPHORE_HANDLE_DESC * semHandleDesc)
Imports an externally allocated synchronization object and returns a handle to that in extSem_out.
The properties of the handle being imported must be described in semHandleDesc. The
CUDA_EXTERNAL_SEMAPHORE_HANDLE_DESC is defined as follows:
typedef struct CUDA_EXTERNAL_SEMAPHORE_HANDLE_DESC_st {
CUexternalSemaphoreHandleType type;
union {
int fd;
struct {
void *handle;
const void *name;
} win32;
} handle;
unsigned int flags;
} CUDA_EXTERNAL_SEMAPHORE_HANDLE_DESC;
where CUDA_EXTERNAL_SEMAPHORE_HANDLE_DESC::type specifies the type of handle being imported.
CUexternalSemaphoreHandleType is defined as:
typedef enum CUexternalSemaphoreHandleType_enum {
CU_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_FD = 1,
CU_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_WIN32 = 2,
CU_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_WIN32_KMT = 3,
CU_EXTERNAL_SEMAPHORE_HANDLE_TYPE_D3D12_FENCE = 4
} CUexternalSemaphoreHandleType;
If CUDA_EXTERNAL_SEMAPHORE_HANDLE_DESC::type is CU_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_FD, then
CUDA_EXTERNAL_SEMAPHORE_HANDLE_DESC::handle::fd must be a valid file descriptor referencing a
synchronization object. Ownership of the file descriptor is transferred to the CUDA driver when the
handle is imported successfully. Performing any operations on the file descriptor after it is imported
results in undefined behavior.
If CUDA_EXTERNAL_SEMAPHORE_HANDLE_DESC::type is CU_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_WIN32, then
exactly one of CUDA_EXTERNAL_SEMAPHORE_HANDLE_DESC::handle::win32::handle and
CUDA_EXTERNAL_SEMAPHORE_HANDLE_DESC::handle::win32::name must not be NULL. If
CUDA_EXTERNAL_SEMAPHORE_HANDLE_DESC::handle::win32::handle is not NULL, then it must represent a valid
shared NT handle that references a synchronization object. Ownership of this handle is not transferred to
CUDA after the import operation, so the application must release the handle using the appropriate system
call. If CUDA_EXTERNAL_SEMAPHORE_HANDLE_DESC::handle::win32::name is not NULL, then it must name a valid
synchronization object.
If CUDA_EXTERNAL_SEMAPHORE_HANDLE_DESC::type is CU_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_WIN32_KMT, then
CUDA_EXTERNAL_SEMAPHORE_HANDLE_DESC::handle::win32::handle must be non-NULL and
CUDA_EXTERNAL_SEMAPHORE_HANDLE_DESC::handle::win32::name must be NULL. The handle specified must be a
globally shared KMT handle. This handle does not hold a reference to the underlying object, and thus will
be invalid when all references to the synchronization object are destroyed.
If CUDA_EXTERNAL_SEMAPHORE_HANDLE_DESC::type is CU_EXTERNAL_SEMAPHORE_HANDLE_TYPE_D3D12_FENCE, then
exactly one of CUDA_EXTERNAL_SEMAPHORE_HANDLE_DESC::handle::win32::handle and
CUDA_EXTERNAL_SEMAPHORE_HANDLE_DESC::handle::win32::name must not be NULL. If
CUDA_EXTERNAL_SEMAPHORE_HANDLE_DESC::handle::win32::handle is not NULL, then it must represent a valid
shared NT handle that is returned by ID3DDevice::CreateSharedHandle when referring to a ID3D12Fence
object. This handle holds a reference to the underlying object. If
CUDA_EXTERNAL_SEMAPHORE_HANDLE_DESC::handle::win32::name is not NULL, then it must name a valid
synchronization object that refers to a valid ID3D12Fence object.
Parameters:
extSem_out - Returned handle to an external semaphore
semHandleDesc - Semaphore import handle descriptor
Returns:
CUDA_SUCCESS, CUDA_ERROR_NOT_INITIALIZED, CUDA_ERROR_INVALID_HANDLE
Note:
Note that this function may also return error codes from previous, asynchronous launches.
See also:
cuDestroyExternalSemaphore, cuSignalExternalSemaphoresAsync, cuWaitExternalSemaphoresAsync
CUresult cuSignalExternalSemaphoresAsync (const CUexternalSemaphore * extSemArray, const
CUDA_EXTERNAL_SEMAPHORE_SIGNAL_PARAMS * paramsArray, unsigned int numExtSems, CUstream stream)
Enqueues a signal operation on a set of externally allocated semaphore object in the specified stream.
The operations will be executed when all prior operations in the stream complete.
The exact semantics of signaling a semaphore depends on the type of the object.
If the semaphore object is any one of the following types: CU_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_FD,
CU_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_WIN32, CU_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_WIN32_KMT then
signaling the semaphore will set it to the signaled state.
If the semaphore object is of the type CU_EXTERNAL_SEMAPHORE_HANDLE_TYPE_D3D12_FENCE, then the semaphore
will be set to the value specified in CUDA_EXTERNAL_SEMAPHORE_SIGNAL_PARAMS::params::fence::value.
Parameters:
extSemArray - Set of external semaphores to be signaled
paramsArray - Array of semaphore parameters
numExtSems - Number of semaphores to signal
stream - Stream to enqueue the signal operations in
Returns:
CUDA_SUCCESS, CUDA_ERROR_NOT_INITIALIZED, CUDA_ERROR_INVALID_HANDLE
Note:
Note that this function may also return error codes from previous, asynchronous launches.
See also:
cuImportExternalSemaphore, cuDestroyExternalSemaphore, cuWaitExternalSemaphoresAsync
CUresult cuWaitExternalSemaphoresAsync (const CUexternalSemaphore * extSemArray, const
CUDA_EXTERNAL_SEMAPHORE_WAIT_PARAMS * paramsArray, unsigned int numExtSems, CUstream stream)
Enqueues a wait operation on a set of externally allocated semaphore object in the specified stream. The
operations will be executed when all prior operations in the stream complete.
The exact semantics of waiting on a semaphore depends on the type of the object.
If the semaphore object is any one of the following types: CU_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_FD,
CU_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_WIN32, CU_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_WIN32_KMT then
waiting on the semaphore will wait until the semaphore reaches the signaled state. The semaphore will
then be reset to the unsignaled state. Therefore for every signal operation, there can only be one wait
operation.
If the semaphore object is of the type CU_EXTERNAL_SEMAPHORE_HANDLE_TYPE_D3D12_FENCE, then waiting on the
semaphore will wait until the value of the semaphore is greater than or equal to
CUDA_EXTERNAL_SEMAPHORE_WAIT_PARAMS::params::fence::value.
Parameters:
extSemArray - External semaphores to be waited on
paramsArray - Array of semaphore parameters
numExtSems - Number of semaphores to wait on
stream - Stream to enqueue the wait operations in
Returns:
CUDA_SUCCESS, CUDA_ERROR_NOT_INITIALIZED, CUDA_ERROR_INVALID_HANDLE
Note:
Note that this function may also return error codes from previous, asynchronous launches.
See also:
cuImportExternalSemaphore, cuDestroyExternalSemaphore, cuSignalExternalSemaphoresAsync
Author
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Version 6.0 28 Jul 2019 External Resource Interoperability(3)