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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