[fio.git] / lib / memalign.c

#include <stdlib.h>
#include <assert.h>
#include <inttypes.h>

#include "memalign.h"
#include "../fio.h"

struct align_footer {
	unsigned int offset;
};

void *fio_memalign(size_t alignment, size_t size)
{
	struct align_footer *f;
	void *ptr, *ret = NULL;

	assert(!(alignment & (alignment - 1)));

	ptr = malloc(size + alignment + size + sizeof(*f) - 1);
	if (ptr) {
		ret = PTR_ALIGN(ptr, alignment - 1);
		f = ret + size;
		f->offset = (uintptr_t) ret - (uintptr_t) ptr;
	}

	return ret;
}

void fio_memfree(void *ptr, size_t size)
{
	struct align_footer *f = ptr + size;

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