--- name: "clEnqueueCopyBuffer" section: "3clc" platform: "linux" package: "opencl-1.2-man-doc" version: "1.0~svn33624-5.1" release: "Debian 13 (Trixie)" platforms: ["linux"] url: "https://new.carta.tech/clEnqueueCopyBuffer" --- # clEnqueueCopyBuffer(3clc) Enqueues a command to copy from one buffer object to another. ## NAME clEnqueueCopyBuffer - Enqueues a command to copy from one buffer object to another. ## **cl\_int clEnqueueCopyBuffer(cl\_command\_queue** *command\_queue***, cl\_mem** *src\_buffer***, cl\_mem** *dst\_buffer***, size\_t** *src\_offset***, size\_t** *dst\_offset***, size\_t** *size***, cl\_uint** *num\_events\_in\_wait\_list***, const cl\_event \****event\_wait\_list***, cl\_event \****event***);** ## PARAMETERS *command\_queue* The command-queue in which the copy command will be queued. The OpenCL context associated with *command\_queue*, *src\_buffer*, and *dst\_buffer* must be the same. *src\_offset* The offset where to begin copying data from *src\_buffer*. *dst\_offset* The offset where to begin copying data into *dst\_buffer*. *size* Refers to the size in bytes to copy. *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. *event* Returns an event object that identifies this particular copy 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**(3clc)](/clEnqueueBarrierWithWaitList/3clc.md) 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. ## ERRORS 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 command-queue. • CL\_INVALID\_CONTEXT if the context associated with *command\_queue*, *src\_buffer*, and *dst\_buffer* are not the same or if the context associated with *command\_queue* and events in *event\_wait\_list* are not the same. • CL\_INVALID\_MEM\_OBJECT if *src\_buffer* and *dst\_buffer* are not valid buffer objects. • CL\_INVALID\_VALUE if *src\_offset*, *dst\_offset*, *size*, *src\_offset* + *size*, or *dst\_offset* + *size* require accessing elements outside the *src\_buffer* and *dst\_buffer* buffer objects respectively. • CL\_INVALID\_VALUE if *size* is 0. • CL\_INVALID\_EVENT\_WAIT\_LIST if *event\_wait\_list* is NULL and *num\_events\_in\_wait\_list* is \> 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\_MISALIGNED\_SUB\_BUFFER\_OFFSET if *src\_buffer* is a sub-buffer object and *offset* specified when the sub-buffer object is created is not aligned to **CL\_DEVICE\_MEM\_BASE\_ADDR\_ALIGN** value for device associated with queue. • CL\_MISALIGNED\_SUB\_BUFFER\_OFFSET if *dst\_buffer* is a sub-buffer object and *offset* specified when the sub-buffer object is created is not aligned to **CL\_DEVICE\_MEM\_BASE\_ADDR\_ALIGN** value for device associated with *queue*. • CL\_MEM\_COPY\_OVERLAP if *src\_buffer* and *dst\_buffer* are the same buffer or subbuffer object and the source and destination regions overlap or if *src\_buffer* and *dst\_buffer* are different sub-buffers of the same associated buffer object and they overlap. The regions overlap if *src\_offset* ≤ to *dst\_offset* ≤ to *src\_offset* + size - 1, or if *dst\_offset* ≤ to *src\_offset* ≤ to *dst\_offset* + size - 1. • CL\_MEM\_OBJECT\_ALLOCATION\_FAILURE if there is a failure to allocate memory for data store associated with *src\_buffer* or *dst\_buffer*. • 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. ## SPECIFICATION **OpenCL Specification**\[1\] ## SEE ALSO [**clEnqueueReadBuffer**(3clc)](/clEnqueueReadBuffer/3clc.md), [**clEnqueueWriteBuffer**(3clc)](/clEnqueueWriteBuffer/3clc.md), [**clCreateBuffer**(3clc)](/clCreateBuffer/3clc.md), [**clCreateSubBuffer**(3clc)](/clCreateSubBuffer/3clc.md), [**clEnqueueCopyBufferToImage**(3clc)](/clEnqueueCopyBufferToImage/3clc.md), [**clEnqueueCopyImageToBuffer**(3clc)](/clEnqueueCopyImageToBuffer/3clc.md) ## AUTHORS **The Khronos Group** ## COPYRIGHT Copyright © 2007-2011 The Khronos Group Inc.\ Permission is hereby granted, free of charge, to any person obtaining a copy of this software and/or associated documentation files (the "Materials"), to deal in the Materials without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Materials, and to permit persons to whom the Materials are furnished to do so, subject to the condition that this copyright notice and permission notice shall be included in all copies or substantial portions of the Materials. ## NOTES - 1\. OpenCL Specification page 79, section 5.2.2 - Reading, Writing, Copying Buffer Objects