Mercurial > hg > nginx-quic
annotate src/core/ngx_shmtx.c @ 4311:45272aab5eea
Unlock of shared memory zones on process crash.
If process exited abnormally while holding lock on some shared memory zone -
unlock it. It may be not safe thing to do (as crash with lock held may
result in corrupted shared memory structure, and other processes will
subsequently crash while trying to access shared data), therefore complain
loudly if unlock succeeds.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Wed, 23 Nov 2011 14:09:19 +0000 |
parents | 13f108b9f3cf |
children | 424a1ac6af43 |
rev | line source |
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611 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 */ | |
5 | |
6 | |
7 #include <ngx_config.h> | |
8 #include <ngx_core.h> | |
9 | |
10 | |
11 #if (NGX_HAVE_ATOMIC_OPS) | |
12 | |
13 | |
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14 static void ngx_shmtx_wakeup(ngx_shmtx_t *mtx); |
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15 |
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16 |
611 | 17 ngx_int_t |
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18 ngx_shmtx_create(ngx_shmtx_t *mtx, ngx_shmtx_sh_t *addr, u_char *name) |
611 | 19 { |
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20 mtx->lock = &addr->lock; |
611 | 21 |
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22 if (mtx->spin == (ngx_uint_t) -1) { |
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23 return NGX_OK; |
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24 } |
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25 |
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26 mtx->spin = 2048; |
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27 |
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28 #if (NGX_HAVE_POSIX_SEM) |
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29 |
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30 mtx->wait = &addr->wait; |
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31 |
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32 if (sem_init(&mtx->sem, 1, 0) == -1) { |
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33 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno, |
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34 "sem_init() failed"); |
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35 } else { |
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36 mtx->semaphore = 1; |
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37 } |
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38 |
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39 #endif |
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40 |
611 | 41 return NGX_OK; |
42 } | |
43 | |
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44 |
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45 void |
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46 ngx_shmtx_destory(ngx_shmtx_t *mtx) |
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47 { |
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48 #if (NGX_HAVE_POSIX_SEM) |
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49 |
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50 if (mtx->semaphore) { |
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51 if (sem_destroy(&mtx->sem) == -1) { |
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52 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno, |
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53 "sem_destroy() failed"); |
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54 } |
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55 } |
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56 |
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57 #endif |
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58 } |
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59 |
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60 |
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61 ngx_uint_t |
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62 ngx_shmtx_trylock(ngx_shmtx_t *mtx) |
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63 { |
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64 return (*mtx->lock == 0 && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid)); |
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65 } |
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66 |
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67 |
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68 void |
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69 ngx_shmtx_lock(ngx_shmtx_t *mtx) |
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70 { |
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71 ngx_uint_t i, n; |
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72 |
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73 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, "shmtx lock"); |
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74 |
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75 for ( ;; ) { |
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76 |
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77 if (*mtx->lock == 0 && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid)) { |
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78 return; |
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79 } |
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80 |
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81 if (ngx_ncpu > 1) { |
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82 |
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83 for (n = 1; n < mtx->spin; n <<= 1) { |
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84 |
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85 for (i = 0; i < n; i++) { |
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86 ngx_cpu_pause(); |
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87 } |
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88 |
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89 if (*mtx->lock == 0 |
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90 && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid)) |
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91 { |
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92 return; |
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93 } |
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94 } |
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95 } |
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96 |
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97 #if (NGX_HAVE_POSIX_SEM) |
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98 |
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99 if (mtx->semaphore) { |
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100 ngx_atomic_fetch_add(mtx->wait, 1); |
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101 |
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102 if (*mtx->lock == 0 && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid)) { |
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103 return; |
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104 } |
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105 |
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106 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, |
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107 "shmtx wait %uA", *mtx->wait); |
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108 |
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109 while (sem_wait(&mtx->sem) == -1) { |
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110 ngx_err_t err; |
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111 |
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112 err = ngx_errno; |
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113 |
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114 if (err != NGX_EINTR) { |
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115 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, err, |
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116 "sem_wait() failed while waiting on shmtx"); |
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117 break; |
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118 } |
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119 |
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120 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, |
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121 "shmtx awoke"); |
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122 } |
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123 |
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124 continue; |
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125 } |
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126 |
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127 #endif |
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128 |
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129 ngx_sched_yield(); |
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130 } |
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131 } |
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132 |
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133 |
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134 void |
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135 ngx_shmtx_unlock(ngx_shmtx_t *mtx) |
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136 { |
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137 if (mtx->spin != (ngx_uint_t) -1) { |
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138 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, "shmtx unlock"); |
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139 } |
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140 |
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141 if (ngx_atomic_cmp_set(mtx->lock, ngx_pid, 0)) { |
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142 ngx_shmtx_wakeup(mtx); |
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143 } |
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144 } |
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145 |
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146 |
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147 ngx_uint_t |
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148 ngx_shmtx_force_unlock(ngx_shmtx_t *mtx, ngx_pid_t pid) |
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149 { |
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150 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, |
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151 "shmtx forced unlock"); |
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152 |
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153 if (ngx_atomic_cmp_set(mtx->lock, pid, 0)) { |
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154 ngx_shmtx_wakeup(mtx); |
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155 return 1; |
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156 } |
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157 |
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158 return 0; |
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159 } |
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160 |
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161 |
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162 static void |
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163 ngx_shmtx_wakeup(ngx_shmtx_t *mtx) |
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164 { |
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165 #if (NGX_HAVE_POSIX_SEM) |
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166 ngx_atomic_uint_t wait; |
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167 |
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168 if (!mtx->semaphore) { |
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169 return; |
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170 } |
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171 |
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172 for ( ;; ) { |
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173 |
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174 wait = *mtx->wait; |
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175 |
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176 if (wait == 0) { |
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177 return; |
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178 } |
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179 |
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180 if (ngx_atomic_cmp_set(mtx->wait, wait, wait - 1)) { |
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181 break; |
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182 } |
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183 } |
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184 |
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185 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, |
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186 "shmtx wake %uA", wait); |
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187 |
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188 if (sem_post(&mtx->sem) == -1) { |
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189 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno, |
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190 "sem_post() failed while wake shmtx"); |
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191 } |
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192 |
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193 #endif |
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194 } |
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195 |
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196 |
611 | 197 #else |
198 | |
199 | |
200 ngx_int_t | |
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201 ngx_shmtx_create(ngx_shmtx_t *mtx, ngx_shmtx_sh_t *addr, u_char *name) |
611 | 202 { |
203 if (mtx->name) { | |
204 | |
205 if (ngx_strcmp(name, mtx->name) == 0) { | |
206 mtx->name = name; | |
207 return NGX_OK; | |
208 } | |
209 | |
210 ngx_shmtx_destory(mtx); | |
211 } | |
212 | |
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213 mtx->fd = ngx_open_file(name, NGX_FILE_RDWR, NGX_FILE_CREATE_OR_OPEN, |
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214 NGX_FILE_DEFAULT_ACCESS); |
611 | 215 |
216 if (mtx->fd == NGX_INVALID_FILE) { | |
860
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217 ngx_log_error(NGX_LOG_EMERG, ngx_cycle->log, ngx_errno, |
611 | 218 ngx_open_file_n " \"%s\" failed", name); |
219 return NGX_ERROR; | |
220 } | |
221 | |
222 if (ngx_delete_file(name) == NGX_FILE_ERROR) { | |
860
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223 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno, |
611 | 224 ngx_delete_file_n " \"%s\" failed", name); |
225 } | |
226 | |
227 mtx->name = name; | |
228 | |
229 return NGX_OK; | |
230 } | |
231 | |
232 | |
233 void | |
234 ngx_shmtx_destory(ngx_shmtx_t *mtx) | |
235 { | |
236 if (ngx_close_file(mtx->fd) == NGX_FILE_ERROR) { | |
860
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237 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno, |
611 | 238 ngx_close_file_n " \"%s\" failed", mtx->name); |
239 } | |
240 } | |
241 | |
242 | |
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243 ngx_uint_t |
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244 ngx_shmtx_trylock(ngx_shmtx_t *mtx) |
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245 { |
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246 ngx_err_t err; |
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247 |
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248 err = ngx_trylock_fd(mtx->fd); |
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249 |
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250 if (err == 0) { |
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251 return 1; |
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252 } |
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253 |
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254 if (err == NGX_EAGAIN) { |
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255 return 0; |
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256 } |
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257 |
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258 #if __osf__ /* Tru64 UNIX */ |
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259 |
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260 if (err == NGX_EACCESS) { |
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261 return 0; |
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262 } |
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263 |
611 | 264 #endif |
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265 |
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266 ngx_log_abort(err, ngx_trylock_fd_n " %s failed", mtx->name); |
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267 |
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268 return 0; |
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269 } |
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270 |
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271 |
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272 void |
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273 ngx_shmtx_lock(ngx_shmtx_t *mtx) |
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274 { |
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275 ngx_err_t err; |
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276 |
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277 err = ngx_lock_fd(mtx->fd); |
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278 |
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279 if (err == 0) { |
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280 return; |
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281 } |
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282 |
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283 ngx_log_abort(err, ngx_lock_fd_n " %s failed", mtx->name); |
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284 } |
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285 |
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286 |
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287 void |
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288 ngx_shmtx_unlock(ngx_shmtx_t *mtx) |
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289 { |
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290 ngx_err_t err; |
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291 |
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292 err = ngx_unlock_fd(mtx->fd); |
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293 |
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294 if (err == 0) { |
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295 return; |
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296 } |
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297 |
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298 ngx_log_abort(err, ngx_unlock_fd_n " %s failed", mtx->name); |
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299 } |
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300 |
4309
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301 |
4310
13f108b9f3cf
Fixed build without atomic operations.
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302 ngx_uint_t |
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303 ngx_shmtx_force_unlock(ngx_shmtx_t *mtx, ngx_pid_t pid) |
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304 { |
4310
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305 return 0; |
4309
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306 } |
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307 |
3909
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308 #endif |