Commit | Line | Data |
---|---|---|
91aea6ec | 1 | #include <assert.h> |
3d2d14bc | 2 | #include <stdlib.h> |
91aea6ec JA |
3 | |
4 | #include "memalign.h" | |
087c0cba TK |
5 | |
6 | #define PTR_ALIGN(ptr, mask) \ | |
7 | (char *)((uintptr_t)((ptr) + (mask)) & ~(mask)) | |
91aea6ec JA |
8 | |
9 | struct align_footer { | |
10 | unsigned int offset; | |
11 | }; | |
12 | ||
91aea6ec JA |
13 | void *fio_memalign(size_t alignment, size_t size) |
14 | { | |
15 | struct align_footer *f; | |
16 | void *ptr, *ret = NULL; | |
17 | ||
18 | assert(!(alignment & (alignment - 1))); | |
19 | ||
ba8b89a1 | 20 | ptr = malloc(size + alignment + sizeof(*f) - 1); |
91aea6ec | 21 | if (ptr) { |
5fb55c77 | 22 | ret = PTR_ALIGN(ptr, alignment - 1); |
91aea6ec | 23 | f = ret + size; |
e43606c2 | 24 | f->offset = (uintptr_t) ret - (uintptr_t) ptr; |
91aea6ec JA |
25 | } |
26 | ||
27 | return ret; | |
28 | } | |
29 | ||
30 | void fio_memfree(void *ptr, size_t size) | |
31 | { | |
32 | struct align_footer *f = ptr + size; | |
33 | ||
34 | free(ptr - f->offset); | |
35 | } |