Request flag used for shared-memory inter-process communication.
| Enumerator |
|---|
| kNone | Flag set when there is no active request.
|
| kAction | Flag set to indicate an action has been supplied.
|
| kStart | Flag set to start the spine.
|
| kStop | Flag set to stop the spine.
|
| kError | Flag set when the last request was invalid.
|