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|
/*
+----------------------------------------------------------------------+
| Yet Another Cache |
+----------------------------------------------------------------------+
| Copyright (c) 2013-2013 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Xinchen Hui <laruence@php.net> |
+----------------------------------------------------------------------+
*/
#include <errno.h>
#include <time.h>
#include <sys/types.h>
#include "php.h"
#include "storage/yac_storage.h"
#include "yac_allocator.h"
static const yac_shared_memory_handlers *shared_memory_handler = NULL;
static const char *shared_model;
int yac_allocator_startup(unsigned long k_size, unsigned long size, char **msg) /* {{{ */ {
char *p;
yac_shared_segment *segments = NULL;
int i, segments_num, segments_array_size, segment_size;
const yac_shared_memory_handlers *he;
if ((he = &yac_shared_memory_handler)) {
int ret = he->create_segments(k_size, size, &segments, &segments_num, msg);
if (!ret) {
if (segments) {
int i;
for (i = 0; i < segments_num; i++) {
if (segments[i].p && segments[i].p != (void *)-1) {
he->detach_segment(&segments[i]);
}
}
free(segments);
}
return 0;
}
} else {
return 0;
}
segment_size = he->segment_type_size();
segments_array_size = (segments_num - 1) * segment_size;
yac_storage = segments[0].p;
memcpy(&YAC_SG(first_seg), (char *)(&segments[0]), segment_size);
YAC_SG(segments_num) = segments_num - 1;
YAC_SG(segments_num_mask) = YAC_SG(segments_num) - 1;
YAC_SG(segments) = (yac_shared_segment **)((char *)yac_storage + YAC_SMM_ALIGNED_SIZE(sizeof(yac_storage_globals) + segment_size - sizeof(yac_shared_segment)));
p = (char *)YAC_SG(segments) + (sizeof(void *) * YAC_SG(segments_num));
memcpy(p, (char *)segments + segment_size, segments_array_size);
for (i = 0; i < YAC_SG(segments_num); i++) {
YAC_SG(segments)[i] = (yac_shared_segment *)p;
p += segment_size;
}
YAC_SG(slots) = (yac_kv_key *)((char *)YAC_SG(segments)
+ (YAC_SG(segments_num) * sizeof(void *)) + YAC_SMM_ALIGNED_SIZE(segments_array_size));
free(segments);
return 1;
}
/* }}} */
void yac_allocator_shutdown(void) /* {{{ */ {
yac_shared_segment **segments;
const yac_shared_memory_handlers *he;
segments = YAC_SG(segments);
if (segments) {
if ((he = &yac_shared_memory_handler)) {
int i = 0;
for (i = 0; i < YAC_SG(segments_num); i++) {
he->detach_segment(segments[i]);
}
he->detach_segment(&YAC_SG(first_seg));
}
}
}
/* }}} */
static inline void *yac_allocator_alloc_algo2(unsigned long size, int hash) /* {{{ */ {
yac_shared_segment *segment;
unsigned int seg_size, retry, pos, current;
current = hash & YAC_SG(segments_num_mask);
/* do we really need lock here? it depends the real life exam */
retry = 3;
do_retry:
segment = YAC_SG(segments)[current];
seg_size = segment->size;
pos = segment->pos;
if ((seg_size - pos) >= size) {
do_alloc:
pos += size;
segment->pos = pos;
if (segment->pos == pos) {
return (void *)((char *)segment->p + (pos - size));
} else if (retry--) {
goto do_retry;
}
return NULL;
} else {
int i, max;
max = (YAC_SG(segments_num) > 4)? 4 : YAC_SG(segments_num);
for (i = 1; i < max; i++) {
segment = YAC_SG(segments)[(current + i) & YAC_SG(segments_num_mask)];
seg_size = segment->size;
pos = segment->pos;
if ((seg_size - pos) >= size) {
current = (current + i) & YAC_SG(segments_num_mask);
goto do_alloc;
}
}
segment->pos = 0;
pos = 0;
++YAC_SG(recycles);
goto do_alloc;
}
}
/* }}} */
#if 0
static inline void *yac_allocator_alloc_algo1(unsigned long size) /* {{{ */ {
int i, j, picked_seg, atime;
picked_seg = (YAC_SG(current_seg) + 1) & YAC_SG(segments_num_mask);
atime = YAC_SG(segments)[picked_seg]->atime;
for (i = 0; i < 10; i++) {
j = (picked_seg + 1) & YAC_SG(segments_num_mask);
if (YAC_SG(segments)[j]->atime < atime) {
picked_seg = j;
atime = YAC_SG(segments)[j]->atime;
}
}
YAC_SG(current_seg) = picked_seg;
YAC_SG(segments)[picked_seg]->pos = 0;
return yac_allocator_alloc_algo2(size);
}
/* }}} */
#endif
unsigned long yac_allocator_real_size(unsigned long size) /* {{{ */ {
unsigned long real_size = YAC_SMM_TRUE_SIZE(size);
if (real_size > YAC_SG(segments)[0]->size) {
return 0;
}
return real_size;
}
/* }}} */
void * yac_allocator_raw_alloc(unsigned long real_size, int hash) /* {{{ */ {
return yac_allocator_alloc_algo2(real_size, hash);
/*
if (YAC_SG(exhausted)) {
return yac_allocator_alloc_algo1(real_size);
} else {
void *p;
if ((p = yac_allocator_alloc_algo2(real_size))) {
return p;
}
return yac_allocator_alloc_algo1(real_size);
}
*/
}
/* }}} */
#if 0
void yac_allocator_touch(void *p, unsigned long atime) /* {{{ */ {
yac_shared_block_header h = *(yac_shared_block_header *)(p - sizeof(yac_shared_block_header));
if (h.seg >= YAC_SG(segments_num)) {
return;
}
YAC_SG(segments)[h.seg]->atime = atime;
}
/* }}} */
#endif
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: noet sw=4 ts=4 fdm=marker
* vim<600: noet sw=4 ts=4
*/
|
