up                 60 uniquepid.h          DmtcpUniqueProcessId up;
up                 61 uniquepid.h          up._hostid = _hostid;
up                 62 uniquepid.h          up._pid = _pid;
up                 63 uniquepid.h          up._time = _time;
up                 64 uniquepid.h          up._computation_generation = _computation_generation;
up                 65 uniquepid.h          return up;