CLENQUEUEBARRIERWITH(3clc)

📦
version 1.0~svn33624 · 3 versions
, in ubuntu jammy, ubuntu noble

✨ clEnqueueBarrierWithWaitList ✨

hi bestie 💖 you've landed on CLENQUEUEBARRIERWITH(3clc) from the OpenCL Manual, and honestly? this one's a bop. it's the "everybody STOP and wait for me" function. main character energy, no cap.

NAME — clEnqueueBarrierWithWaitList: a synchronization point that enqueues a barrier operation. periodt. 🛑

🌸 NAME (aka who is she)

clEnqueueBarrierWithWaitList — A synchronization point that enqueues a barrier operation.

and here's her signature, exactly as she is, don't touch a single character:

cl_int clEnqueueBarrierWithWaitList(cl_command_queue command_queue,
                                    cl_uint num_events_in_wait_list,
                                    const cl_event *event_wait_list,
                                    cl_event *event);

🎀 PARAMETERS (the deets, the lore)

  • command_queue — a valid command queue. that's it, that's the whole vibe. it has to be valid or we're gonna have a bad time 🫶
  • event_wait_list, num_events_in_wait_list — these two are a package deal, they specify events that need to complete before this particular command can be executed. it's giving "don't start without me" 🧚
    • if event_wait_list is NULL, then num_events_in_wait_list must be 0. like, zero. nada. 🌸
    • 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. they're the group chat that has to finish typing before you send your message 💅
    • the context associated with events in event_wait_list and command_queue must be the same. same context, same energy, fr fr.
    • the memory associated with event_wait_list can be reused or freed after the function returns. she doesn't cling, she lets go 🦋
    • if event_wait_list is NULL, then this particular command waits until all previous enqueued commands to command_queue have completed. full send, no shortcuts.
  • event — returns an event object that identifies this particular command. event objects are unique and can be used to identify this barrier command later on. iconic ⭐
    • 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. so like, you can do that, but you're flying blind 🙈
    • 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. do not do that. i'm begging. 💀

📝 NOTES

okay so here's what she actually does:

she enqueues a barrier command which waits for either a list of events to complete, or — if the list is empty — it waits for all commands previously enqueued in command_queue to complete before it completes.

this command blocks command execution, that is, any following commands enqueued after it do not execute until it completes. she's the bouncer at the door, nobody gets past her until she says so 🛑

this command returns an event which can be waited on, i.e. this event can be waited on to insure that all events either in the event_wait_list or all previously enqueued commands, queued before this command to command_queue, have completed. so you can literally wait on the waiter. it's giving meta ✨

🔥 ERRORS

returns CL_SUCCESS if the function was successfully executed. otherwise, she hands you one of these bad boys:

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

📖 SPECIFICATION

OpenCL Specification[1]

👑 SEE ALSO

your homework, bestie, go read these too:

💜 AUTHORS

The Khronos Group

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 (round two, the footnotes)

  1. OpenCL Specification page 187, section 5.10 - Markers, Barriers and Waiting for Events

and that's the whole page, babe 🫶 this was CLENQUEUEBARRIERWITH(3clc) from The Khronos Group, dated 01/14/2021. go forth and synchronize responsibly. mwah 💖✨

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