clCreateUserEvent(3) Creates a user event object.

cl_event clCreateUserEvent(cl_context context, cl_int *errcode_ret);



A valid OpenCL context used to create the user event object.


Returns an appropriate error code. If errcode_ret is NULL, no error code is returned.


User events allow applications to enqueue commands that wait on a user event to finish before the command is executed by the device.

The execution status of the user event object created is set to CL_SUBMITTED.


Returns a valid non-zero buffer object and errcode_ret is set to CL_SUCCESS if the user event object is created successfully. Otherwise, it returns a NULL value with one of the following error values returned in errcode_ret:

• CL_INVALID_CONTEXT if context is not a valid context.

• 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.


m[blue]OpenCL Specificationm[][1]


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OpenCL Specification
page 178, section 5.9 - Event Objects