Mercurial > hg > nginx
annotate src/http/ngx_http_busy_lock.c @ 5510:3ff29c30effb
SPDY: elimination of r->blocked counter usage for queuing frames.
It was used to prevent destroying of request object when there are unsent
frames in queue for the stream. Since it was incremented for each frame
and is only 8 bits long, so it was not very hard to overflow the counter.
Now the stream->queued counter is checked instead.
author | Valentin Bartenev <vbart@nginx.com> |
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date | Tue, 14 Jan 2014 16:24:45 +0400 |
parents | 14411ee4d89f |
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rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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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); | |
176
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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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49 |
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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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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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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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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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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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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257
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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 |
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229 for (i = 1; i < cf->args->nelts; i++) { |
174
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230 |
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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 |
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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 |
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253 case 'w': |
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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); |
4474 | 277 if (bl->timeout == (time_t) NGX_ERROR) { |
176
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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) { |
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289 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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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 |
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294 if (invalid) { |
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295 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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296 "invalid value \"%s\"", value[i].data); |
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297 return NGX_CONF_ERROR; |
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298 } |
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299 } |
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300 |
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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, |
4522 | 303 "busy lock waiting is useless with zero timeout, ignoring"); |
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304 } |
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305 |
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306 return NGX_CONF_OK; |
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307 } |