clWaitForEvents
clWaitForEvents
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clWaitForEvents Waits on the host thread for commands identified by event objects to complete.

##

cl_int `clWaitForEvents` cl_uint num_events const cl_event*event_list

## Parameters

`event_list`

  The events specified in `event_list` act as synchronization points.

## Notes

Waits on the host thread for commands identified by event objects in `event_list` to complete. A command is considered complete if its execution status is `CL_COMPLETE` or a negative value. The events specified in `event_list` act as synchronization points.

If the cl_khr_gl_event extension is enabled, event objects can also be used to reflect the status of an OpenGL sync object. The sync object in turn refers to a fence command executing in an OpenGL command stream. This provides another method of coordinating sharing of buffers and images between OpenGL and OpenCL.

## Errors

Returns CL_SUCCESS if the execution status of all events in `event_list` is CL_COMPLETE. Otherwise, it returns one of the following errors:

- CL_INVALID_VALUE if `num_events` is zero or `event_list` is NULL..
- CL_INVALID_CONTEXT if events specified in `event_list` do not belong to the same context.
- CL_INVALID_EVENT if event objects specified in `event_list` are not valid event objects.
- CL_EXEC_STATUS_ERROR_FOR_EVENTS_IN_WAIT_LIST if the execution status of any of the events in `event_list` is a negative integer value.
- 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

## Also see

clGetEventInfo, clReleaseEvent, clRetainEvent, cl_khr_gl_event

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