Function rtapi_shmem_delete 

pub unsafe extern "C" fn rtapi_shmem_delete(
    shmem_id: c_int,
    module_id: c_int,
) -> c_int

‘rtapi_shmem_delete()’ frees the shared memory block associated with ‘shmem_id’. ‘module_id’ is the ID of the calling module. Returns a status code. Call only from within user or init/cleanup code, not from realtime tasks.