Mercurial > hg > nginx
annotate src/http/ngx_http_busy_lock.c @ 253:b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
author | Igor Sysoev <igor@sysoev.ru> |
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date | Mon, 09 Feb 2004 07:46:43 +0000 |
parents | 8dee38ea9117 |
children | 70e1c7d2b83d |
rev | line source |
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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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45 |
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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 %d:%d" _ |
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63 rc _ bl->waiting _ bl->max_waiting); |
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65 if (rc == NGX_OK) { /* no the same request, there's free slot */ |
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66 return NGX_OK; |
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67 } |
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69 if (rc == NGX_ERROR && !lock) { /* no the same request, no free slot */ |
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70 return NGX_OK; |
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71 } |
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73 /* rc == NGX_AGAIN: the same request */ |
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75 if (bc->time) { |
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76 if (bc->time < bl->timeout) { |
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77 ngx_add_timer(bc->event, 1000); |
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78 return NGX_AGAIN; |
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79 } |
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80 |
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81 bl->waiting--; |
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82 return NGX_DONE; |
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84 } |
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86 if (bl->timeout == 0) { |
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87 return NGX_DONE; |
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88 } |
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89 |
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90 if (bl->waiting < bl->max_waiting) { |
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91 bl->waiting++; |
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92 ngx_add_timer(bc->event, 1000); |
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93 bc->event->event_handler = bc->event_handler; |
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94 |
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95 /* TODO: ngx_handle_level_read_event() */ |
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96 |
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97 return NGX_AGAIN; |
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98 } |
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99 |
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100 return NGX_ERROR; |
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101 } |
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102 |
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103 |
178
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104 void ngx_http_busy_unlock(ngx_http_busy_lock_t *bl, |
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105 ngx_http_busy_lock_ctx_t *bc) |
176
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106 { |
189
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107 if (bl == NULL) { |
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108 return; |
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109 } |
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110 |
178
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111 if (bl->md5) { |
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112 bl->md5_mask[bc->slot / 8] &= ~(1 << (bc->slot & 7)); |
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113 bl->cachable--; |
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114 } |
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115 |
176
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116 bl->busy--; |
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117 } |
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118 |
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119 |
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120 static int ngx_http_busy_lock_look_cachable(ngx_http_busy_lock_t *bl, |
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121 ngx_http_busy_lock_ctx_t *bc, |
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122 int lock) |
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123 { |
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124 int i, b, cachable, free; |
175
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125 u_int mask; |
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126 |
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127 b = 0; |
176
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128 cachable = 0; |
175
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129 free = -1; |
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130 |
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131 #if (NGX_SUPPRESS_WARN) |
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132 mask = 0; |
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133 #endif |
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134 |
176
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135 for (i = 0; i < bl->max_busy; i++) { |
175
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136 |
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137 if ((b & 7) == 0) { |
176
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138 mask = bl->md5_mask[i / 8]; |
175
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139 } |
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140 |
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141 if (mask & 1) { |
176
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142 if (ngx_memcmp(&bl->md5[i * 16], bc->md5, 16) == 0) { |
175
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143 return NGX_AGAIN; |
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144 } |
176
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145 cachable++; |
175
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146 |
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147 } else if (free == -1) { |
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148 free = i; |
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149 } |
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150 |
176
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151 #if 1 |
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152 if (cachable == bl->cachable) { |
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153 if (free == -1 && cachable < bl->max_busy) { |
175
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154 free = i + 1; |
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155 } |
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156 |
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157 break; |
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158 } |
176
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159 #endif |
175
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160 |
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161 mask >>= 1; |
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162 b++; |
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163 } |
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164 |
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165 if (free == -1) { |
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166 return NGX_ERROR; |
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167 } |
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168 |
176
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169 if (lock) { |
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170 if (bl->busy == bl->max_busy) { |
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171 return NGX_ERROR; |
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172 } |
175
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173 |
176
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174 ngx_memcpy(&bl->md5[free * 16], bc->md5, 16); |
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175 bl->md5_mask[free / 8] |= 1 << (free & 7); |
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176 bc->slot = free; |
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177 |
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178 bl->cachable++; |
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179 bl->busy++; |
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180 } |
175
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181 |
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182 return NGX_OK; |
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183 } |
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184 |
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185 |
174
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186 char *ngx_http_set_busy_lock_slot(ngx_conf_t *cf, ngx_command_t *cmd, |
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187 void *conf) |
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188 { |
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189 char *p = conf; |
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190 |
176
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191 int i, dup, invalid; |
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192 ngx_str_t *value, line; |
174
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193 ngx_http_busy_lock_t *bl, **blp; |
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194 |
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195 blp = (ngx_http_busy_lock_t **) (p + cmd->offset); |
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196 if (*blp) { |
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197 return "is duplicate"; |
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198 } |
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199 |
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200 /* ngx_calloc_shared() */ |
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201 if (!(bl = ngx_pcalloc(cf->pool, sizeof(ngx_http_busy_lock_t)))) { |
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202 return NGX_CONF_ERROR; |
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203 } |
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204 *blp = bl; |
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205 |
176
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206 dup = 0; |
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207 invalid = 0; |
195
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208 value = cf->args->elts; |
174
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209 |
176
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210 for (i = 1; i < cf->args->nelts; i++) { |
174
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211 |
176
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212 if (value[i].data[1] != '=') { |
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213 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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214 "invalid value \"%s\"", value[i].data); |
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215 return NGX_CONF_ERROR; |
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216 } |
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217 |
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218 switch (value[i].data[0]) { |
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219 |
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220 case 'b': |
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221 if (bl->max_busy) { |
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222 dup = 1; |
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223 break; |
174
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224 } |
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225 |
176
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226 bl->max_busy = ngx_atoi(value[i].data + 2, value[i].len - 2); |
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227 if (bl->max_busy == NGX_ERROR) { |
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228 invalid = 1; |
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229 break; |
174
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230 } |
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231 |
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232 continue; |
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233 |
176
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234 case 'w': |
174
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235 if (bl->max_waiting) { |
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236 dup = 1; |
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237 break; |
174
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238 } |
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239 |
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240 bl->max_waiting = ngx_atoi(value[i].data + 2, value[i].len - 2); |
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241 if (bl->max_waiting == NGX_ERROR) { |
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242 invalid = 1; |
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243 break; |
174
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244 } |
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245 |
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246 continue; |
176
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247 |
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248 case 't': |
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249 if (bl->timeout) { |
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250 dup = 1; |
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251 break; |
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252 } |
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253 |
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254 line.len = value[i].len - 2; |
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255 line.data = value[i].data + 2; |
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256 |
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257 bl->timeout = ngx_parse_time(&line, 1); |
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258 if (bl->timeout == NGX_ERROR) { |
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259 invalid = 1; |
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260 break; |
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261 } |
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262 |
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263 continue; |
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264 |
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265 default: |
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266 invalid = 1; |
174
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267 } |
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268 |
176
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269 if (dup) { |
174
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270 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
176
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271 "duplicate value \"%s\"", value[i].data); |
174
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272 return NGX_CONF_ERROR; |
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273 } |
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274 |
176
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275 if (invalid) { |
174
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276 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
176
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277 "invalid value \"%s\"", value[i].data); |
174
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278 return NGX_CONF_ERROR; |
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279 } |
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280 } |
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281 |
176
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282 if (bl->timeout == 0 && bl->max_waiting) { |
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283 ngx_conf_log_error(NGX_LOG_WARN, cf, 0, |
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284 "busy lock waiting is useless with zero timeout"); |
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285 } |
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286 |
174
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287 return NGX_CONF_OK; |
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288 } |