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+// Emacs style mode select -*- C++ -*-
+//-----------------------------------------------------------------------------
+//
+// Copyright(C) 1993-1996 Id Software, Inc.
+// Copyright(C) 2005 Simon Howard
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License
+// as published by the Free Software Foundation; either version 2
+// of the License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+// 02111-1307, USA.
+//
+// DESCRIPTION:
+// Archiving: SaveGame I/O.
+// Thinker, Ticker.
+//
+//-----------------------------------------------------------------------------
+
+
+#include "z_zone.h"
+#include "p_local.h"
+
+#include "doomstat.h"
+
+
+int leveltime;
+
+//
+// THINKERS
+// All thinkers should be allocated by Z_Malloc
+// so they can be operated on uniformly.
+// The actual structures will vary in size,
+// but the first element must be thinker_t.
+//
+
+
+
+// Both the head and tail of the thinker list.
+thinker_t thinkercap;
+
+
+//
+// P_InitThinkers
+//
+void P_InitThinkers (void)
+{
+ thinkercap.prev = thinkercap.next = &thinkercap;
+}
+
+
+
+
+//
+// P_AddThinker
+// Adds a new thinker at the end of the list.
+//
+void P_AddThinker (thinker_t* thinker)
+{
+ thinkercap.prev->next = thinker;
+ thinker->next = &thinkercap;
+ thinker->prev = thinkercap.prev;
+ thinkercap.prev = thinker;
+}
+
+
+
+//
+// P_RemoveThinker
+// Deallocation is lazy -- it will not actually be freed
+// until its thinking turn comes up.
+//
+void P_RemoveThinker (thinker_t* thinker)
+{
+ // FIXME: NOP.
+ thinker->function.acv = (actionf_v)(-1);
+}
+
+
+
+//
+// P_AllocateThinker
+// Allocates memory and adds a new thinker at the end of the list.
+//
+void P_AllocateThinker (thinker_t* thinker)
+{
+}
+
+
+
+//
+// P_RunThinkers
+//
+void P_RunThinkers (void)
+{
+ thinker_t* currentthinker;
+
+ currentthinker = thinkercap.next;
+ while (currentthinker != &thinkercap)
+ {
+ if ( currentthinker->function.acv == (actionf_v)(-1) )
+ {
+ // time to remove it
+ currentthinker->next->prev = currentthinker->prev;
+ currentthinker->prev->next = currentthinker->next;
+ Z_Free (currentthinker);
+ }
+ else
+ {
+ if (currentthinker->function.acp1)
+ currentthinker->function.acp1 (currentthinker);
+ }
+ currentthinker = currentthinker->next;
+ }
+}
+
+
+
+//
+// P_Ticker
+//
+
+void P_Ticker (void)
+{
+ int i;
+
+ // run the tic
+ if (paused)
+ return;
+
+ // pause if in menu and at least one tic has been run
+ if ( !netgame
+ && menuactive
+ && !demoplayback
+ && players[consoleplayer].viewz != 1)
+ {
+ return;
+ }
+
+
+ for (i=0 ; i<MAXPLAYERS ; i++)
+ if (playeringame[i])
+ P_PlayerThink (&players[i]);
+
+ P_RunThinkers ();
+ P_UpdateSpecials ();
+ P_RespawnSpecials ();
+
+ // for par times
+ leveltime++;
+}