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annotate src/core/ngx_palloc.h @ 860:201d017ea470

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slab allocator in shared memory
author Igor Sysoev <igor@sysoev.ru>
date Mon, 20 Nov 2006 08:51:45 +0000
parents 5dac8c7fb71b
children 4d203f76b757
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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7 #ifndef _NGX_PALLOC_H_INCLUDED_
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8 #define _NGX_PALLOC_H_INCLUDED_
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11 #include <ngx_config.h>
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12 #include <ngx_core.h>
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15 /*
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16 * NGX_MAX_ALLOC_FROM_POOL should be (ngx_pagesize - 1), i.e. 4095 on x86.
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17 * On FreeBSD 5.x it allows to use the zero copy sending.
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18 * On Windows NT it decreases a number of locked pages in a kernel.
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19 */
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20 #define NGX_MAX_ALLOC_FROM_POOL (ngx_pagesize - 1)
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22 #define NGX_DEFAULT_POOL_SIZE (16 * 1024)
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25 typedef void (*ngx_pool_cleanup_pt)(void *data);
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27 typedef struct ngx_pool_cleanup_s ngx_pool_cleanup_t;
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29 struct ngx_pool_cleanup_s {
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30 ngx_pool_cleanup_pt handler;
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31 void *data;
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32 ngx_pool_cleanup_t *next;
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33 };
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36 typedef struct ngx_pool_large_s ngx_pool_large_t;
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38 struct ngx_pool_large_s {
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39 ngx_pool_large_t *next;
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40 void *alloc;
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41 };
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44 struct ngx_pool_s {
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45 u_char *last;
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46 u_char *end;
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47 ngx_pool_t *current;
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48 ngx_chain_t *chain;
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49 ngx_pool_t *next;
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50 ngx_pool_large_t *large;
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51 ngx_pool_cleanup_t *cleanup;
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52 ngx_log_t *log;
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53 };
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56 typedef struct {
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57 ngx_fd_t fd;
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58 u_char *name;
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59 ngx_log_t *log;
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60 } ngx_pool_cleanup_file_t;
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64 void *ngx_alloc(size_t size, ngx_log_t *log);
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65 void *ngx_calloc(size_t size, ngx_log_t *log);
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67 ngx_pool_t *ngx_create_pool(size_t size, ngx_log_t *log);
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68 void ngx_destroy_pool(ngx_pool_t *pool);
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70 void *ngx_palloc(ngx_pool_t *pool, size_t size);
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71 void *ngx_pcalloc(ngx_pool_t *pool, size_t size);
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72 ngx_int_t ngx_pfree(ngx_pool_t *pool, void *p);
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75 ngx_pool_cleanup_t *ngx_pool_cleanup_add(ngx_pool_t *p, size_t size);
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76 void ngx_pool_cleanup_file(void *data);
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79 #endif /* _NGX_PALLOC_H_INCLUDED_ */