C Specification

To enqueue a command to fill a region in memory with a pattern of a given pattern size, call the function

// Provided by CL_VERSION_2_0
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);
clEnqueueSVMMemFill is missing before version 2.0.

Parameters

  • command_queue 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.

  • svm_ptr is 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.

  • pattern is 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 supported by OpenCL as described in Shared Application Scalar Data Types and Supported Application Vector Data Types. 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.

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

  • 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 command and can be used to query or queue a wait for this command to complete. If event is NULL or 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.

Description

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_OPERATION

    • if the device associated with command_queue does not support SVM

  • 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

    • if svm_ptr is not aligned to pattern_size bytes

    • if pattern is NULL

    • if pattern_size is zero

    • if pattern_size is not a power of two

    • if pattern_size is greater than 128

    • 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 is greater than zero

    • if event_wait_list is not NULL and num_events_in_wait_list is zero

    • 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

See Also

CL_VERSION_2_0, cl_command_queue, cl_event, cl_uint

Document Notes

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.

Copyright

Copyright 2014-2026 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0