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/*
*
* File: blalloc.h
* Owner: Wohali (Joan Touzet)
*
*
*
*/
#ifndef INCLUDED_blalloc_h
#define INCLUDED_blalloc_h
#ifndef INCLUDED_sys_types_h
#include <sys/types.h> /* size_t */
#define INCLUDED_sys_types_h
#endif
#ifndef INCLUDED_stddef_h
#include <stddef.h>
#define INCLUDED_stddef_h
#endif
/*
* Block contains status information for an allocated block in our
* heap.
*/
struct Block {
void* elems; /* Points to allocated memory */
void* endElem; /* Points to last elem for boundck */
int freeElems; /* Number of available elems */
struct Block* next; /* Next in our chain of blocks */
unsigned long* allocMap; /* Bitmap of allocated blocks */
};
typedef struct Block Block;
/*
* BlockHeap contains the information for the root node of the
* memory heap.
*/
struct BlockHeap {
size_t elemSize; /* Size of each element to be stored */
int elemsPerBlock; /* Number of elements per block */
int numlongs; /* Size of Block's allocMap array */
int blocksAllocated; /* Number of blocks allocated */
int freeElems; /* Number of free elements */
Block* base; /* Pointer to first block */
};
typedef struct BlockHeap BlockHeap;
extern BlockHeap* BlockHeapCreate(size_t elemsize, int elemsperblock);
extern void BlockHeapDestroy(BlockHeap *bh);
extern void* BlockHeapAlloc(BlockHeap *bh);
extern void BlockHeapFree(BlockHeap *bh, void *ptr);
extern void BlockHeapGarbageCollect(BlockHeap *);
extern void BlockHeapCountMemory(BlockHeap *bh, size_t *, size_t *, size_t *);
#define BlockHeapALLOC(bh, type) ((type*) BlockHeapAlloc(bh))
#endif /* INCLUDED_blalloc_h */
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