If both the current context and peerContext are on devices which support unified addressing (as may be queried using CU_DEVICE_ATTRIBUTE_UNIFIED_ADDRESSING), then on success all allocations from peerContext will immediately be accessible by the current context. See Unified Addressing for additional details.
Note that access granted by this call is unidirectional and that in order to access memory from the current context in peerContext, a separate symmetric call to cuCtxEnablePeerAccess() is required.
Returns CUDA_ERROR_INVALID_DEVICE if cuDeviceCanAccessPeer() indicates that the CUdevice of the current context cannot directly access memory from the CUdevice of peerContext.
Returns CUDA_ERROR_PEER_ACCESS_ALREADY_ENABLED if direct access of peerContext from the current context has already been enabled.
Returns CUDA_ERROR_INVALID_CONTEXT if there is no current context, peerContext is not a valid context, or if the current context is peerContext.
Returns CUDA_ERROR_INVALID_VALUE if Flags is not 0.
- Parameters:
-
| peerContext | - Peer context to enable direct access to from the current context |
| Flags | - Reserved for future use and must be set to 0 |
- Returns:
- CUDA_SUCCESS, CUDA_ERROR_DEINITIALIZED, CUDA_ERROR_NOT_INITIALIZED, CUDA_ERROR_INVALID_DEVICE, CUDA_ERROR_PEER_ACCESS_ALREADY_ENABLED, CUDA_ERROR_INVALID_CONTEXT, CUDA_ERROR_INVALID_VALUE
- Note:
- Note that this function may also return error codes from previous, asynchronous launches.
- See also:
- cuDeviceCanAccessPeer, cuCtxDisablePeerAccess
