Enqueues a command to fill a region in memory with a pattern of a given pattern size.

cl_int clEnqueueSVMMemFill(cl_command_queue command_queue,
                           void *svm_ptr,
                           const void *pattern,
                           size_t pattern_size,
                           size_t size,
                           cl_uint num_events_in_wait_list,
                           const cl_event *event_wait_list,
                           cl_event *event)



Refers to the host command-queue in which the fill command will be queued. The OpenCL context associated with command_queue and SVM pointer referred to by svm_ptr must be the same.


A pointer to a memory region that will be filled with pattern. It must be aligned to pattern_size bytes. If svm_ptr is allocated using clSVMAlloc then it must be allocated from the same context from which command_queue was created. Otherwise the behavior is undefined.


A pointer to the data pattern of size pattern_size in bytes. pattern will be used to fill a region in buffer starting at svm_ptr and is size bytes in size. The data pattern must be a scalar or vector integer or floating-point data type. For example, if region pointed to by svm_ptr is to be filled with a pattern of float4 values, then pattern will be a pointer to a cl_float4 value and pattern_size will be sizeof(cl_float4). The maximum value of pattern_size is the size of the largest integer or floating-point vector data type supported by the OpenCL device. The memory associated with pattern can be reused or freed after the function returns.


The size in bytes of region being filled starting with svm_ptr and must be a multiple of pattern_size.

event_wait_list , 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.


Returns an event object that identifies this particular write command and can be used to query or queue a wait for this particular command to complete. event can be NULL in which case it will not be possible for the application to query the status of this command or queue a wait for this command to complete. clEnqueueBarrierWithWaitList can be used instead. If the event_wait_list and the event arguments are not NULL, the event argument should not refer to an element of the event_wait_list array.


clEnqueueSVMMemFill returns CL_SUCCESS if the function is executed successfully. Otherwise, it returns one of the following errors.

  • CL_INVALID_COMMAND_QUEUE if command_queue is not a valid host command-queue.

  • CL_INVALID_CONTEXT if the context associated with command_queue and events in event_wait_list are not the same.

  • CL_INVALID_VALUE if svm_ptr is NULL.

  • CL_INVALID_VALUE if svm_ptr is not aligned to pattern_size bytes.

  • CL_INVALID_VALUE if pattern is NULL or if pattern_size is 0 or if pattern_size is not one of {1, 2, 4, 8, 16, 32, 64, 128}.

  • CL_INVALID_VALUE if size is not a multiple of pattern_size.

  • CL_INVALID_EVENT_WAIT_LIST if event_wait_list is NULL and num_events_in_wait_list > 0, or event_wait_list is not NULL and num_events_in_wait_list is 0, or if event objects in event_wait_list are not valid events.

  • CL_OUT_OF_RESOURCES if there is a failure to allocate resources required by the OpenCL implementation on the device.

  • CL_OUT_OF_HOST_MEMORY if there is a failure to allocate resources required by the OpenCL implementation on the host.

Also see