ref: a7a315bff61bff58a9c918294f53c1e87d7ae7bb
dir: /sys/src/games/doom/z_zone.h/
// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// $Id:$
//
// Copyright (C) 1993-1996 by id Software, Inc.
//
// This source is available for distribution and/or modification
// only under the terms of the DOOM Source Code License as
// published by id Software. All rights reserved.
//
// The source is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
// for more details.
//
// DESCRIPTION:
// Zone Memory Allocation, perhaps NeXT ObjectiveC inspired.
// Remark: this was the only stuff that, according
// to John Carmack, might have been useful for
// Quake.
//
//---------------------------------------------------------------------
#ifndef __Z_ZONE__
#define __Z_ZONE__
#include "doomdef.h"
//
// ZONE MEMORY
// PU - purge tags.
// Tags < 100 are not overwritten until freed.
#define PU_STATIC 1 // static entire execution time
#define PU_SOUND 2 // static while playing
#define PU_MUSIC 3 // static while playing
#define PU_DAVE 4 // anything else Dave wants static
#define PU_LEVEL 50 // static until level exited
#define PU_LEVSPEC 51 // a special thinker in a level
// Tags >= 100 are purgable whenever needed.
#define PU_PURGELEVEL 100
#define PU_CACHE 101
void Z_Init (void);
void* Z_Malloc (int size, int tag, void *ptr);
void Z_Free (void *ptr);
void Z_FreeTags (int lowtag, int hightag);
void Z_DumpHeap (int lowtag, int hightag);
void Z_FileDumpHeap (FILE *f);
void Z_CheckHeap (void);
void Z_ChangeTag2 (void *ptr, int tag);
int Z_FreeMemory (void);
typedef struct memblock_s
{
int size; // including the header and possibly tiny fragments
void** user; // NULL if a free block
int tag; // purgelevel
int id; // should be ZONEID
struct memblock_s* next;
struct memblock_s* prev;
} memblock_t;
//
// This is used to get the local FILE:LINE info from CPP
// prior to really call the function in question.
//
#define Z_ChangeTag(p,t) \
{ \
if (( (memblock_t *)( (byte *)(p) - sizeof(memblock_t)))->id!=0x1d4a11) \
I_Error("Z_CT at __FILE__:__LINE__"); \
Z_ChangeTag2(p,t); \
};
#endif
//-----------------------------------------------------------------------------
//
// $Log:$
//
//-----------------------------------------------------------------------------