/* this code very simplified, removed sanity checks,  etc */

local int playerKey;
struct playerData {
  int kills;
  int deaths;
}

//raise kills and deaths
local void Kill(Arena *arena, Player *killer, Player *killed, int bounty, int flags, int *pts, int *green) {
  struct playerData *killerData = PPDATA(killer, playerKey);
  struct playerData *killedData = PPDATA(killed, playerKey);
  killerData->kills++;
  killedData->deaths++;
}

//reset kills and deaths when a new game begins
local void StartGame (Arena *arena) {
  Player *p;
  Link *link;

  pd->Lock();
  FOR_EACH_PLAYER(p)  {
     if (arena == p->arena) {
        struct playerData *pData = PPDATA(p, playerKey);
        pData->deaths = pData->kills = 0;
     }
  }
  pd->Unlock();
}

//reset kills and deaths when entering a new arena
local void PlayerAction (Player *p, int action, Arena *arena)
{
  if (action == PA_ENTERARENA)
  {
     struct playerData *pData = PPDATA(p, playerKey);
     pData->deaths = pData->kills = 0;
  }

local PlayerPersistentData persistData = {
  5560050, INTERVAL_GAME, PERSIST_ALLARENAS,
  getData, setData, clearData
};

EXPORT int MM_mymodule(int action, Imodman *mm_, Arena *arena)
{
  if (action == MM_LOAD) {
     ...
     persist->RegPlayerPD(&persistData);
     ...
  } else if (action == MM_UNLOAD) {
     ...
     persist->UnregPlayerPD(&persistData);
     ...
  }
}

local int GetData(Player *p, void *data, int len, void *clos) {
//..
}
local void SetData(Player *p, void *data, int len, void *clos) {
//..
}
local void ClearData(Player *p, void *clos) {
//..
}

persist->EndInterval(NULL, arena, INTERVAL_GAME);