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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 "storage/yac_storage.h"
#include "storage/allocator/yac_allocator.h"
#ifdef USE_MMAP
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
# define MAP_ANONYMOUS MAP_ANON
#endif
#ifndef MAP_FAILED
#define MAP_FAILED (void *)-1
#endif
typedef struct {
yac_shared_segment common;
unsigned long size;
} yac_shared_segment_mmap;
static int create_segments(unsigned long k_size, unsigned long v_size, yac_shared_segment_mmap **shared_segments_p, int *shared_segments_count, char **error_in) /* {{{ */ {
unsigned long allocate_size, occupied_size = 0;
unsigned int i, segment_size, segments_num = 1024;
yac_shared_segment_mmap first_segment;
k_size = YAC_SMM_ALIGNED_SIZE(k_size);
v_size = YAC_SMM_ALIGNED_SIZE(v_size);
while ((v_size / segments_num) < YAC_SMM_SEGMENT_MIN_SIZE) {
segments_num >>= 1;
}
segment_size = v_size / segments_num;
++segments_num;
allocate_size = k_size + v_size;
first_segment.common.p = mmap(0, allocate_size, PROT_READ | PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
if (first_segment.common.p == MAP_FAILED) {
*error_in = "mmap";
return 0;
}
first_segment.size = allocate_size;
first_segment.common.size = k_size;
first_segment.common.pos = 0;
*shared_segments_p = (yac_shared_segment_mmap *)calloc(1, segments_num * sizeof(yac_shared_segment_mmap));
if (!*shared_segments_p) {
munmap(first_segment.common.p, first_segment.size);
*error_in = "calloc";
return 0;
} else {
*shared_segments_p[0] = first_segment;
}
*shared_segments_count = segments_num;
occupied_size = k_size;
for (i = 1; i < segments_num; i++) {
(*shared_segments_p)[i].size = 0;
(*shared_segments_p)[i].common.pos = 0;
(*shared_segments_p)[i].common.p = first_segment.common.p + occupied_size;
if ((allocate_size - occupied_size) >= YAC_SMM_ALIGNED_SIZE(segment_size)) {
(*shared_segments_p)[i].common.size = YAC_SMM_ALIGNED_SIZE(segment_size);
occupied_size += YAC_SMM_ALIGNED_SIZE(segment_size);
} else {
(*shared_segments_p)[i].common.size = (allocate_size - occupied_size);
break;
}
}
return 1;
}
/* }}} */
static int detach_segment(yac_shared_segment *shared_segment) /* {{{ */ {
if (shared_segment->size) {
munmap(shared_segment->p, shared_segment->size);
}
return 0;
}
/* }}} */
static unsigned long segment_type_size(void) /* {{{ */ {
return sizeof(yac_shared_segment_mmap);
}
/* }}} */
yac_shared_memory_handlers yac_alloc_mmap_handlers = /* {{{ */ {
(create_segments_t)create_segments,
detach_segment,
segment_type_size
};
/* }}} */
#endif /* USE_MMAP */
/*
* 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
*/
|
