Mercurial > hg > nginx-quic
annotate src/http/ngx_http_busy_lock.c @ 4452:ed05b25a721f stable-1.0
Merge of r4422:
Fixed error handling in ngx_event_connect_peer().
Previously if ngx_add_event() failed a connection was freed two times (once
in the ngx_event_connect_peer(), and again by a caller) as pc->connection was
left set. Fix is to always use ngx_close_connection() to close connection
properly and set pc->connection to NULL on errors.
Patch by Piotr Sikora.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Sun, 05 Feb 2012 20:06:50 +0000 |
parents | 4919fb357a5d |
children | 41f640a693de |
rev | line source |
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441
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
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4 * Copyright (C) Nginx, Inc. |
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5 */ |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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10 #include <ngx_http.h> |
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1565 | 14 static int ngx_http_busy_lock_look_cacheable(ngx_http_busy_lock_t *bl, |
15 ngx_http_busy_lock_ctx_t *bc, | |
16 int lock); | |
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19 int ngx_http_busy_lock(ngx_http_busy_lock_t *bl, ngx_http_busy_lock_ctx_t *bc) |
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20 { |
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21 if (bl->busy < bl->max_busy) { |
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22 bl->busy++; |
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23 |
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24 if (bc->time) { |
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25 bc->time = 0; |
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26 bl->waiting--; |
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27 } |
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29 return NGX_OK; |
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30 } |
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32 if (bc->time) { |
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33 if (bc->time < bl->timeout) { |
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34 ngx_add_timer(bc->event, 1000); |
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35 return NGX_AGAIN; |
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36 } |
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37 |
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38 bl->waiting--; |
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39 return NGX_DONE; |
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41 } |
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43 if (bl->timeout == 0) { |
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44 return NGX_DONE; |
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45 } |
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47 if (bl->waiting < bl->max_waiting) { |
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48 bl->waiting++; |
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509 | 50 #if 0 |
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51 ngx_add_timer(bc->event, 1000); |
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52 bc->event->event_handler = bc->event_handler; |
509 | 53 #endif |
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54 |
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55 /* TODO: ngx_handle_level_read_event() */ |
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57 return NGX_AGAIN; |
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58 } |
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60 return NGX_ERROR; |
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61 } |
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1565 | 64 int ngx_http_busy_lock_cacheable(ngx_http_busy_lock_t *bl, |
65 ngx_http_busy_lock_ctx_t *bc, int lock) | |
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66 { |
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67 int rc; |
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1565 | 69 rc = ngx_http_busy_lock_look_cacheable(bl, bc, lock); |
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70 |
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71 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, bc->event->log, 0, |
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72 "http busylock: %d w:%d mw::%d", |
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73 rc, bl->waiting, bl->max_waiting); |
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74 |
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75 if (rc == NGX_OK) { /* no the same request, there's free slot */ |
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76 return NGX_OK; |
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77 } |
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78 |
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79 if (rc == NGX_ERROR && !lock) { /* no the same request, no free slot */ |
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80 return NGX_OK; |
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81 } |
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82 |
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83 /* rc == NGX_AGAIN: the same request */ |
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84 |
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85 if (bc->time) { |
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86 if (bc->time < bl->timeout) { |
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87 ngx_add_timer(bc->event, 1000); |
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88 return NGX_AGAIN; |
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89 } |
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90 |
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91 bl->waiting--; |
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92 return NGX_DONE; |
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93 |
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94 } |
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95 |
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96 if (bl->timeout == 0) { |
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97 return NGX_DONE; |
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98 } |
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99 |
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100 if (bl->waiting < bl->max_waiting) { |
509 | 101 #if 0 |
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102 bl->waiting++; |
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103 ngx_add_timer(bc->event, 1000); |
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104 bc->event->event_handler = bc->event_handler; |
509 | 105 #endif |
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106 |
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107 /* TODO: ngx_handle_level_read_event() */ |
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108 |
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109 return NGX_AGAIN; |
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110 } |
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111 |
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112 return NGX_ERROR; |
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113 } |
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114 |
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115 |
178
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116 void ngx_http_busy_unlock(ngx_http_busy_lock_t *bl, |
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117 ngx_http_busy_lock_ctx_t *bc) |
176
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118 { |
189
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119 if (bl == NULL) { |
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120 return; |
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121 } |
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122 |
178
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123 if (bl->md5) { |
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124 bl->md5_mask[bc->slot / 8] &= ~(1 << (bc->slot & 7)); |
1565 | 125 bl->cacheable--; |
178
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126 } |
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127 |
176
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128 bl->busy--; |
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129 } |
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130 |
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131 |
1565 | 132 static int ngx_http_busy_lock_look_cacheable(ngx_http_busy_lock_t *bl, |
133 ngx_http_busy_lock_ctx_t *bc, | |
134 int lock) | |
176
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135 { |
1565 | 136 int i, b, cacheable, free; |
175
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137 u_int mask; |
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138 |
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139 b = 0; |
1565 | 140 cacheable = 0; |
175
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141 free = -1; |
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142 |
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143 #if (NGX_SUPPRESS_WARN) |
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144 mask = 0; |
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145 #endif |
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146 |
176
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147 for (i = 0; i < bl->max_busy; i++) { |
175
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148 |
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149 if ((b & 7) == 0) { |
176
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150 mask = bl->md5_mask[i / 8]; |
175
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151 } |
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152 |
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153 if (mask & 1) { |
176
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154 if (ngx_memcmp(&bl->md5[i * 16], bc->md5, 16) == 0) { |
175
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155 return NGX_AGAIN; |
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156 } |
1565 | 157 cacheable++; |
175
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158 |
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159 } else if (free == -1) { |
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160 free = i; |
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161 } |
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162 |
176
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163 #if 1 |
1565 | 164 if (cacheable == bl->cacheable) { |
165 if (free == -1 && cacheable < bl->max_busy) { | |
175
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166 free = i + 1; |
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167 } |
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168 |
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169 break; |
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170 } |
176
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171 #endif |
175
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172 |
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173 mask >>= 1; |
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174 b++; |
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175 } |
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176 |
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177 if (free == -1) { |
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178 return NGX_ERROR; |
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179 } |
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180 |
176
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181 if (lock) { |
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182 if (bl->busy == bl->max_busy) { |
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183 return NGX_ERROR; |
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184 } |
175
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185 |
176
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186 ngx_memcpy(&bl->md5[free * 16], bc->md5, 16); |
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187 bl->md5_mask[free / 8] |= 1 << (free & 7); |
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188 bc->slot = free; |
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189 |
1565 | 190 bl->cacheable++; |
176
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191 bl->busy++; |
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192 } |
175
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193 |
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194 return NGX_OK; |
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195 } |
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196 |
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197 |
174
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198 char *ngx_http_set_busy_lock_slot(ngx_conf_t *cf, ngx_command_t *cmd, |
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199 void *conf) |
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200 { |
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201 char *p = conf; |
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202 |
290
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203 ngx_uint_t i, dup, invalid; |
176
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204 ngx_str_t *value, line; |
174
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205 ngx_http_busy_lock_t *bl, **blp; |
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206 |
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207 blp = (ngx_http_busy_lock_t **) (p + cmd->offset); |
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208 if (*blp) { |
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209 return "is duplicate"; |
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210 } |
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211 |
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212 /* ngx_calloc_shared() */ |
501 | 213 bl = ngx_pcalloc(cf->pool, sizeof(ngx_http_busy_lock_t)); |
214 if (bl == NULL) { | |
174
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215 return NGX_CONF_ERROR; |
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216 } |
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217 *blp = bl; |
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218 |
272
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219 /* ngx_calloc_shared() */ |
501 | 220 bl->mutex = ngx_pcalloc(cf->pool, sizeof(ngx_event_mutex_t)); |
221 if (bl->mutex == NULL) { | |
272
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222 return NGX_CONF_ERROR; |
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223 } |
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224 |
176
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225 dup = 0; |
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226 invalid = 0; |
195
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227 value = cf->args->elts; |
174
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228 |
176
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229 for (i = 1; i < cf->args->nelts; i++) { |
174
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230 |
176
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231 if (value[i].data[1] != '=') { |
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232 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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233 "invalid value \"%s\"", value[i].data); |
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234 return NGX_CONF_ERROR; |
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235 } |
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236 |
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237 switch (value[i].data[0]) { |
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238 |
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239 case 'b': |
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240 if (bl->max_busy) { |
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241 dup = 1; |
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242 break; |
174
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243 } |
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244 |
176
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245 bl->max_busy = ngx_atoi(value[i].data + 2, value[i].len - 2); |
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246 if (bl->max_busy == NGX_ERROR) { |
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247 invalid = 1; |
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248 break; |
174
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249 } |
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250 |
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251 continue; |
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252 |
176
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253 case 'w': |
174
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254 if (bl->max_waiting) { |
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255 dup = 1; |
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256 break; |
174
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257 } |
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258 |
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259 bl->max_waiting = ngx_atoi(value[i].data + 2, value[i].len - 2); |
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260 if (bl->max_waiting == NGX_ERROR) { |
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261 invalid = 1; |
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262 break; |
174
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263 } |
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264 |
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265 continue; |
176
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266 |
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267 case 't': |
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268 if (bl->timeout) { |
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269 dup = 1; |
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270 break; |
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271 } |
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272 |
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273 line.len = value[i].len - 2; |
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274 line.data = value[i].data + 2; |
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275 |
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276 bl->timeout = ngx_parse_time(&line, 1); |
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277 if (bl->timeout == NGX_ERROR) { |
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278 invalid = 1; |
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279 break; |
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280 } |
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281 |
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282 continue; |
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283 |
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284 default: |
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285 invalid = 1; |
174
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286 } |
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287 |
176
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288 if (dup) { |
174
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289 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
176
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290 "duplicate value \"%s\"", value[i].data); |
174
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291 return NGX_CONF_ERROR; |
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292 } |
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293 |
176
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294 if (invalid) { |
174
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295 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
176
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296 "invalid value \"%s\"", value[i].data); |
174
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297 return NGX_CONF_ERROR; |
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298 } |
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299 } |
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300 |
176
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301 if (bl->timeout == 0 && bl->max_waiting) { |
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302 ngx_conf_log_error(NGX_LOG_WARN, cf, 0, |
276
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303 "busy lock waiting is useless with zero timeout, ignoring"); |
176
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304 } |
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305 |
174
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306 return NGX_CONF_OK; |
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307 } |