## C Specification

To enqueue a barrier command which waits for commands to complete, call the function

cl_int clEnqueueBarrier(
cl_command_queue command_queue);

## Parameters

• command_queue is a valid host command-queue.

## Description

The barrier command 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. The barrier command is a synchronization point.

clEnqueueBarrier returns CL_​SUCCESS if the function is successfully executed. Otherwise, it returns one of the following errors:

• CL_​INVALID_​COMMAND_​QUEUE if command_queue is not a valid host command-queue.

• 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.

## Document Notes

This page is extracted from the OpenCL Specification. Fixes and changes should be made to the Specification, not directly.