PK_ERROR_code_t   PK_PMARK_ask_marks
(
--- received arguments ---
PK_PMARK_t        pmark,        --- a pmark

--- returned arguments ---
int        *const n_marks,      --- number of marks of pmark
PK_MARK_t **const marks         --- marks of pmark (optional)
)


This functions returns the marks which use the given pmark. A mark M uses
the given pmark if rolling to M would make the given pmark current.


Specific Errors:
    PK_ERROR_rollback_not_started  Partitioned rollback is not active


The output array marks is optional. If it is set to NULL, the function
will only compute the number of marks using the given pmark.