Mercurial > hg > nginx
annotate src/http/ngx_http_busy_lock.c @ 176:c0552e5ab567
nginx-0.0.1-2003-11-09-23:03:38 import; separate building
author | Igor Sysoev <igor@sysoev.ru> |
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date | Sun, 09 Nov 2003 20:03:38 +0000 |
parents | e92c2c647c57 |
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2 #include <ngx_config.h> |
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3 #include <ngx_core.h> |
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4 #include <ngx_http.h> |
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8 static int ngx_http_busy_lock_look_cachable(ngx_http_busy_lock_t *bl, |
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9 ngx_http_busy_lock_ctx_t *bc, |
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10 int lock); |
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13 int ngx_http_busy_lock(ngx_http_busy_lock_t *bl, ngx_http_busy_lock_ctx_t *bc) |
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14 { |
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15 if (bl->busy < bl->max_busy) { |
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16 bl->busy++; |
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18 if (bc->time) { |
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19 bc->time = 0; |
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20 bl->waiting--; |
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21 } |
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23 return NGX_OK; |
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24 } |
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26 if (bc->time) { |
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27 if (bc->time < bl->timeout) { |
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28 ngx_add_timer(bc->event, 1000); |
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29 return NGX_AGAIN; |
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30 } |
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32 bl->waiting--; |
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33 return NGX_DONE; |
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35 } |
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37 if (bl->timeout == 0) { |
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38 return NGX_DONE; |
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39 } |
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41 if (bl->waiting < bl->max_waiting) { |
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42 bl->waiting++; |
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43 ngx_add_timer(bc->event, 1000); |
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44 bc->event->event_handler = bc->event_handler; |
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46 /* TODO: ngx_handle_level_read_event() */ |
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48 return NGX_AGAIN; |
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49 } |
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51 return NGX_ERROR; |
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52 } |
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55 int ngx_http_busy_lock_cachable(ngx_http_busy_lock_t *bl, |
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56 ngx_http_busy_lock_ctx_t *bc, int lock) |
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57 { |
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58 int rc; |
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60 rc = ngx_http_busy_lock_look_cachable(bl, bc, lock); |
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62 ngx_log_debug(bc->event->log, "BUSYLOCK: %d" _ rc); |
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64 if (rc == NGX_OK) { /* no the same request, there's free slot */ |
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65 return NGX_OK; |
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66 } |
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68 if (rc == NGX_ERROR && !lock) { /* no the same request, no free slot */ |
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69 return NGX_OK; |
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70 } |
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72 /* rc == NGX_AGAIN: the same request */ |
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74 if (bc->time) { |
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75 if (bc->time < bl->timeout) { |
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76 ngx_add_timer(bc->event, 1000); |
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77 return NGX_AGAIN; |
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78 } |
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80 bl->waiting--; |
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81 return NGX_DONE; |
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83 } |
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85 if (bl->timeout == 0) { |
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86 return NGX_DONE; |
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87 } |
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89 if (bl->waiting < bl->max_waiting) { |
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90 bl->waiting++; |
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91 ngx_add_timer(bc->event, 1000); |
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92 bc->event->event_handler = bc->event_handler; |
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93 |
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94 /* TODO: ngx_handle_level_read_event() */ |
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96 return NGX_AGAIN; |
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97 } |
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99 return NGX_ERROR; |
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100 } |
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102 |
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103 void ngx_http_busy_unlock_cachable(ngx_http_busy_lock_t *bl, |
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104 ngx_http_busy_lock_ctx_t *bc) |
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105 { |
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106 bl->md5_mask[bc->slot / 8] &= ~(1 << (bc->slot & 7)); |
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107 bl->cachable--; |
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108 bl->busy--; |
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109 } |
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110 |
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111 |
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112 static int ngx_http_busy_lock_look_cachable(ngx_http_busy_lock_t *bl, |
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113 ngx_http_busy_lock_ctx_t *bc, |
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114 int lock) |
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115 { |
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116 int i, b, cachable, free; |
175
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117 u_int mask; |
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118 |
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119 b = 0; |
176
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120 cachable = 0; |
175
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121 free = -1; |
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122 |
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123 #if (NGX_SUPPRESS_WARN) |
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124 mask = 0; |
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125 #endif |
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126 |
176
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127 for (i = 0; i < bl->max_busy; i++) { |
175
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128 |
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129 if ((b & 7) == 0) { |
176
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130 mask = bl->md5_mask[i / 8]; |
175
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131 } |
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132 |
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133 if (mask & 1) { |
176
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134 if (ngx_memcmp(&bl->md5[i * 16], bc->md5, 16) == 0) { |
175
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135 return NGX_AGAIN; |
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136 } |
176
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137 cachable++; |
175
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138 |
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139 } else if (free == -1) { |
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140 free = i; |
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141 } |
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142 |
176
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143 #if 1 |
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144 if (cachable == bl->cachable) { |
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145 if (free == -1 && cachable < bl->max_busy) { |
175
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146 free = i + 1; |
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147 } |
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148 |
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149 break; |
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150 } |
176
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151 #endif |
175
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152 |
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153 mask >>= 1; |
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154 b++; |
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155 } |
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156 |
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157 if (free == -1) { |
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158 return NGX_ERROR; |
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159 } |
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160 |
176
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161 if (lock) { |
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162 if (bl->busy == bl->max_busy) { |
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163 return NGX_ERROR; |
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164 } |
175
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165 |
176
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166 ngx_memcpy(&bl->md5[free * 16], bc->md5, 16); |
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167 bl->md5_mask[free / 8] |= 1 << (free & 7); |
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168 bc->slot = free; |
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169 |
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170 bl->cachable++; |
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171 bl->busy++; |
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172 } |
175
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173 |
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174 return NGX_OK; |
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175 } |
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176 |
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177 |
174
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178 char *ngx_http_set_busy_lock_slot(ngx_conf_t *cf, ngx_command_t *cmd, |
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179 void *conf) |
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180 { |
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181 char *p = conf; |
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182 |
176
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183 int i, dup, invalid; |
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184 ngx_str_t *value, line; |
174
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185 ngx_http_busy_lock_t *bl, **blp; |
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186 |
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187 blp = (ngx_http_busy_lock_t **) (p + cmd->offset); |
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188 if (*blp) { |
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189 return "is duplicate"; |
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190 } |
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191 |
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192 /* ngx_calloc_shared() */ |
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193 if (!(bl = ngx_pcalloc(cf->pool, sizeof(ngx_http_busy_lock_t)))) { |
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194 return NGX_CONF_ERROR; |
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195 } |
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196 *blp = bl; |
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197 |
176
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198 dup = 0; |
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199 invalid = 0; |
174
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200 value = (ngx_str_t *) cf->args->elts; |
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201 |
176
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202 for (i = 1; i < cf->args->nelts; i++) { |
174
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203 |
176
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204 if (value[i].data[1] != '=') { |
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205 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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206 "invalid value \"%s\"", value[i].data); |
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207 return NGX_CONF_ERROR; |
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208 } |
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209 |
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210 switch (value[i].data[0]) { |
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211 |
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212 case 'b': |
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213 if (bl->max_busy) { |
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214 dup = 1; |
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215 break; |
174
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216 } |
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217 |
176
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218 bl->max_busy = ngx_atoi(value[i].data + 2, value[i].len - 2); |
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219 if (bl->max_busy == NGX_ERROR) { |
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220 invalid = 1; |
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221 break; |
174
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222 } |
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223 |
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224 continue; |
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225 |
176
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226 case 'w': |
174
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227 if (bl->max_waiting) { |
176
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228 dup = 1; |
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229 break; |
174
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230 } |
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231 |
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232 bl->max_waiting = ngx_atoi(value[i].data + 2, value[i].len - 2); |
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233 if (bl->max_waiting == NGX_ERROR) { |
176
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234 invalid = 1; |
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235 break; |
174
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236 } |
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237 |
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238 continue; |
176
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239 |
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240 case 't': |
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241 if (bl->timeout) { |
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242 dup = 1; |
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243 break; |
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244 } |
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245 |
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246 line.len = value[i].len - 2; |
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247 line.data = value[i].data + 2; |
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248 |
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249 bl->timeout = ngx_parse_time(&line, 1); |
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250 if (bl->timeout == NGX_ERROR) { |
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251 invalid = 1; |
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252 break; |
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253 } |
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254 |
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255 continue; |
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256 |
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257 default: |
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258 invalid = 1; |
174
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259 } |
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260 |
176
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261 if (dup) { |
174
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262 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
176
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263 "duplicate value \"%s\"", value[i].data); |
174
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264 return NGX_CONF_ERROR; |
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265 } |
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266 |
176
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267 if (invalid) { |
174
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268 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
176
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269 "invalid value \"%s\"", value[i].data); |
174
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270 return NGX_CONF_ERROR; |
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271 } |
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272 } |
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273 |
176
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274 if (bl->timeout == 0 && bl->max_waiting) { |
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275 ngx_conf_log_error(NGX_LOG_WARN, cf, 0, |
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276 "busy lock waiting is useless with zero timeout"); |
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277 } |
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278 |
174
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279 return NGX_CONF_OK; |
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280 } |