81 lines
2.8 KiB
C
81 lines
2.8 KiB
C
//=======================================================================
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// Copyright XashXT Group 2007 ©
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// basemem.h - base memory manager
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//=======================================================================
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#ifndef BASEMEMORY_H
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#define BASEMEMORY_H
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// give malloc padding so we can't waste most of a page at the end
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#define MEMCLUMPSIZE (65536 - 1536)
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// smallest unit we care about is this many bytes
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#define MEMUNIT 8
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#define MEMBITS (MEMCLUMPSIZE / MEMUNIT)
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#define MEMBITINTS (MEMBITS / 32)
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#define MEMCLUMP_SENTINEL 0xABADCAFE
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#define MEMHEADER_SENTINEL1 0xDEADF00D
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#define MEMHEADER_SENTINEL2 0xDF
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#include <setjmp.h>
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typedef struct memheader_s
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{
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// next and previous memheaders in chain belonging to pool
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struct memheader_s *next;
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struct memheader_s *prev;
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struct mempool_s *pool;// pool this memheader belongs to
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// clump this memheader lives in, NULL if not in a clump
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struct memclump_s *clump;
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size_t size; // size of the memory after the header (excluding header and sentinel2)
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const char *filename;// file name and line where Mem_Alloc was called
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int fileline;
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unsigned int sentinel1;// should always be MEMHEADER_SENTINEL1
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// immediately followed by data, which is followed by a MEMHEADER_SENTINEL2 byte
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}
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memheader_t;
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typedef struct memclump_s
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{
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// contents of the clump
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byte block[MEMCLUMPSIZE];
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// should always be MEMCLUMP_SENTINEL
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unsigned int sentinel1;
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// if a bit is on, it means that the MEMUNIT bytes it represents are
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// allocated, otherwise free
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int bits[MEMBITINTS];
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// should always be MEMCLUMP_SENTINEL
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unsigned int sentinel2;
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// if this drops to 0, the clump is freed
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size_t blocksinuse;
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// largest block of memory available (this is reset to an optimistic
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// number when anything is freed, and updated when alloc fails the clump)
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size_t largestavailable;
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// next clump in the chain
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struct memclump_s *chain;
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}
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memclump_t;
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typedef struct mempool_s
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{
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unsigned int sentinel1;// should always be MEMHEADER_SENTINEL1
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struct memheader_s *chain;// chain of individual memory allocations
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struct memclump_s *clumpchain;// chain of clumps (if any)
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size_t totalsize;// total memory allocated in this pool (inside memheaders)
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size_t realsize;// total memory allocated in this pool (actual malloc total)
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// updated each time the pool is displayed by memlist, shows change from previous time (unless pool was freed)
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size_t lastchecksize;
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struct mempool_s *next;// linked into global mempool list
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const char *filename;// file name and line where Mem_AllocPool was called
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int fileline;
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char name[128];// name of the pool
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unsigned int sentinel2;// should always be MEMHEADER_SENTINEL1
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}
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mempool_t;
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extern byte *basepool;
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extern byte *zonepool;
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#endif//BASEMEMORY_H
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