1 #ifndef MALLOC_IMPL_H
2 #define MALLOC_IMPL_H
3 
4 #include <sys/mman.h>
5 
6 hidden void *__expand_heap(size_t *);
7 
8 hidden void __malloc_donate(char *, char *);
9 
10 hidden void *__memalign(size_t, size_t);
11 
12 struct chunk {
13 	size_t psize, csize;
14 	struct chunk *next, *prev;
15 };
16 
17 struct bin {
18 	volatile int lock[2];
19 	struct chunk *head;
20 	struct chunk *tail;
21 };
22 
23 #define SIZE_ALIGN (4*sizeof(size_t))
24 #define SIZE_MASK (-SIZE_ALIGN)
25 #define OVERHEAD (2*sizeof(size_t))
26 #define MMAP_THRESHOLD (0x1c00*SIZE_ALIGN)
27 #define DONTCARE 16
28 #define RECLAIM 163840
29 
30 #define CHUNK_SIZE(c) ((c)->csize & -2)
31 #define CHUNK_PSIZE(c) ((c)->psize & -2)
32 #define PREV_CHUNK(c) ((struct chunk *)((char *)(c) - CHUNK_PSIZE(c)))
33 #define NEXT_CHUNK(c) ((struct chunk *)((char *)(c) + CHUNK_SIZE(c)))
34 #define MEM_TO_CHUNK(p) (struct chunk *)((char *)(p) - OVERHEAD)
35 #define CHUNK_TO_MEM(c) (void *)((char *)(c) + OVERHEAD)
36 #define BIN_TO_CHUNK(i) (MEM_TO_CHUNK(&mal.bins[i].head))
37 
38 #define C_INUSE  ((size_t)1)
39 
40 #define IS_MMAPPED(c) !((c)->csize & (C_INUSE))
41 
42 hidden void __bin_chunk(struct chunk *);
43 
44 hidden extern int __malloc_replaced;
45 
46 #endif
47