To enqueue a command to do a memcpy operation, call the function
const void* src_ptr,
const cl_event* event_wait_list,
|clEnqueueSVMMemcpy is missing before version 2.0.
command_queue refers to the host command-queue in which the read / write command will be queued. If either dst_ptr or src_ptr is allocated using clSVMAlloc then the OpenCL context allocated against must match that of command_queue.
blocking_copy indicates if the copy operation is blocking or non-blocking.
If blocking_copy is
CL_TRUEi.e. the copy command is blocking, clEnqueueSVMMemcpy does not return until the buffer data has been copied into memory pointed to by dst_ptr.
size is the size in bytes of data being copied.
dst_ptr is the pointer to a host or SVM memory allocation where data is copied to.
src_ptr is the pointer to a host or SVM memory allocation where data is copied from.
event_wait_list and num_events_in_wait_list specify events that need to complete before this particular command can be executed. If event_wait_list is
NULL, then this particular command does not wait on any event to complete. If event_wait_list is
NULL, num_events_in_wait_list must be 0. If event_wait_list is not
NULL, the list of events pointed to by event_wait_list must be valid and num_events_in_wait_list must be greater than 0. The events specified in event_wait_list act as synchronization points. The context associated with events in event_wait_list and command_queue must be the same. The memory associated with event_wait_list can be reused or freed after the function returns.
event returns an event object that identifies this read / write command and can be used to query or queue a wait for this command to complete. If event is
NULLor the enqueue is unsuccessful, no event will be created and therefore it will not be possible to query the status of this command or to wait for this command to complete. If event_wait_list and event are not
NULL, event must not refer to an element of the event_wait_list array.
If blocking_copy is
CL_FALSE i.e. the copy command is non-blocking,
clEnqueueSVMMemcpy queues a non-blocking copy command and returns.
The contents of the buffer that dst_ptr points to cannot be used until the
copy command has completed.
The event argument returns an event object which can be used to query the
execution status of the read command.
When the copy command has completed, the contents of the buffer that
dst_ptr points to can be used by the application.
If the memory allocation(s) containing dst_ptr and/or src_ptr are allocated using clSVMAlloc and either is not allocated from the same context from which command_queue was created the behavior is undefined.
CL_SUCCESS if the function is executed
Otherwise, it returns one of the following errors:
CL_INVALID_if command_queue is not a valid host command-queue.
CL_INVALID_if the device associated with command_queue does not support SVM.
CL_INVALID_if the context associated with command_queue and events in event_wait_list are not the same.
CL_INVALID_if event_wait_list is
EVENT_ WAIT_ LIST
NULLand num_events_in_wait_list > 0, or event_wait_list is not
NULLand num_events_in_wait_list is 0, or if event objects in event_wait_list are not valid events.
CL_EXEC_if the copy operation is blocking and the execution status of any of the events in event_wait_list is a negative integer value.
STATUS_ ERROR_ FOR_ EVENTS_ IN_ WAIT_ LIST
CL_INVALID_if dst_ptr or src_ptr is
CL_MEM_if the values specified for dst_ptr, src_ptr and size result in an overlapping copy.
CL_OUT_if there is a failure to allocate resources required by the OpenCL implementation on the device.
CL_OUT_if there is a failure to allocate resources required by the OpenCL implementation on the host.
OF_ HOST_ MEMORY
For more information, see the OpenCL Specification
This page is extracted from the OpenCL Specification. Fixes and changes should be made to the Specification, not directly.