Mercurial > hg > nginx-quic
annotate src/core/ngx_array.c @ 4309:3f6040cd731e
Added shmtx interface to forcibly unlock mutexes.
It is currently used from master process on abnormal worker termination to
unlock accept mutex (unlocking of accept mutex was broken in 1.0.2). It is
expected to be used in the future to unlock other mutexes as well.
Shared mutex code was rewritten to make this possible in a safe way, i.e.
with a check if lock was actually held by the exited process. We again use
pid to lock mutex, and use separate atomic variable for a count of processes
waiting in sem_wait().
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Wed, 23 Nov 2011 13:55:38 +0000 |
parents | 2a92804f4109 |
children | d620f497c50f |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
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4 */ |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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10 |
605 | 11 ngx_array_t * |
12 ngx_array_create(ngx_pool_t *p, ngx_uint_t n, size_t size) | |
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13 { |
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14 ngx_array_t *a; |
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15 |
501 | 16 a = ngx_palloc(p, sizeof(ngx_array_t)); |
17 if (a == NULL) { | |
485 | 18 return NULL; |
19 } | |
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20 |
501 | 21 a->elts = ngx_palloc(p, n * size); |
22 if (a->elts == NULL) { | |
485 | 23 return NULL; |
24 } | |
25 | |
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26 a->nelts = 0; |
485 | 27 a->size = size; |
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28 a->nalloc = n; |
485 | 29 a->pool = p; |
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30 |
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31 return a; |
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32 } |
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33 |
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34 |
605 | 35 void |
36 ngx_array_destroy(ngx_array_t *a) | |
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37 { |
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38 ngx_pool_t *p; |
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39 |
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40 p = a->pool; |
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41 |
2049 | 42 if ((u_char *) a->elts + a->size * a->nalloc == p->d.last) { |
43 p->d.last -= a->size * a->nalloc; | |
44
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44 } |
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45 |
2049 | 46 if ((u_char *) a + sizeof(ngx_array_t) == p->d.last) { |
47 p->d.last = (u_char *) a; | |
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48 } |
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49 } |
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51 |
605 | 52 void * |
53 ngx_array_push(ngx_array_t *a) | |
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54 { |
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55 void *elt, *new; |
485 | 56 size_t size; |
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57 ngx_pool_t *p; |
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58 |
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59 if (a->nelts == a->nalloc) { |
485 | 60 |
61 /* the array is full */ | |
62 | |
63 size = a->size * a->nalloc; | |
64 | |
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65 p = a->pool; |
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66 |
2049 | 67 if ((u_char *) a->elts + size == p->d.last |
68 && p->d.last + a->size <= p->d.end) | |
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69 { |
485 | 70 /* |
71 * the array allocation is the last in the pool | |
72 * and there is space for new allocation | |
73 */ | |
74 | |
2049 | 75 p->d.last += a->size; |
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76 a->nalloc++; |
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77 |
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78 } else { |
485 | 79 /* allocate a new array */ |
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80 |
501 | 81 new = ngx_palloc(p, 2 * size); |
82 if (new == NULL) { | |
485 | 83 return NULL; |
84 } | |
85 | |
86 ngx_memcpy(new, a->elts, size); | |
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87 a->elts = new; |
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88 a->nalloc *= 2; |
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89 } |
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90 } |
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91 |
485 | 92 elt = (u_char *) a->elts + a->size * a->nelts; |
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93 a->nelts++; |
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94 |
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95 return elt; |
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96 } |
485 | 97 |
98 | |
605 | 99 void * |
100 ngx_array_push_n(ngx_array_t *a, ngx_uint_t n) | |
485 | 101 { |
102 void *elt, *new; | |
103 size_t size; | |
104 ngx_uint_t nalloc; | |
105 ngx_pool_t *p; | |
106 | |
107 size = n * a->size; | |
108 | |
109 if (a->nelts + n > a->nalloc) { | |
110 | |
111 /* the array is full */ | |
112 | |
113 p = a->pool; | |
114 | |
2049 | 115 if ((u_char *) a->elts + a->size * a->nalloc == p->d.last |
116 && p->d.last + size <= p->d.end) | |
485 | 117 { |
118 /* | |
119 * the array allocation is the last in the pool | |
120 * and there is space for new allocation | |
121 */ | |
122 | |
2049 | 123 p->d.last += size; |
485 | 124 a->nalloc += n; |
125 | |
126 } else { | |
127 /* allocate a new array */ | |
128 | |
129 nalloc = 2 * ((n >= a->nalloc) ? n : a->nalloc); | |
130 | |
501 | 131 new = ngx_palloc(p, nalloc * a->size); |
132 if (new == NULL) { | |
485 | 133 return NULL; |
134 } | |
135 | |
136 ngx_memcpy(new, a->elts, a->nelts * a->size); | |
137 a->elts = new; | |
138 a->nalloc = nalloc; | |
139 } | |
140 } | |
141 | |
142 elt = (u_char *) a->elts + a->size * a->nelts; | |
143 a->nelts += n; | |
144 | |
145 return elt; | |
146 } |