Mercurial > hg > nginx
annotate src/http/ngx_http_busy_lock.c @ 3496:fb88801564de
build nginx/Windows against OpenSSL-0.9.8n, since nginx-0.8.35
built against OpenSSL-1.0.0 crashed on Windows XP somewhere
in the NTDLL.DLL on the master process exit
author | Igor Sysoev <igor@sysoev.ru> |
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date | Wed, 21 Apr 2010 15:09:17 +0000 |
parents | 4c43e25d11ea |
children | d620f497c50f |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
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4 */ |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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9 #include <ngx_http.h> |
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1565 | 13 static int ngx_http_busy_lock_look_cacheable(ngx_http_busy_lock_t *bl, |
14 ngx_http_busy_lock_ctx_t *bc, | |
15 int lock); | |
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17 |
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18 int ngx_http_busy_lock(ngx_http_busy_lock_t *bl, ngx_http_busy_lock_ctx_t *bc) |
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19 { |
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20 if (bl->busy < bl->max_busy) { |
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21 bl->busy++; |
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22 |
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23 if (bc->time) { |
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24 bc->time = 0; |
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25 bl->waiting--; |
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26 } |
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27 |
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28 return NGX_OK; |
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29 } |
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31 if (bc->time) { |
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32 if (bc->time < bl->timeout) { |
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33 ngx_add_timer(bc->event, 1000); |
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34 return NGX_AGAIN; |
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35 } |
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36 |
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37 bl->waiting--; |
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38 return NGX_DONE; |
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40 } |
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42 if (bl->timeout == 0) { |
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43 return NGX_DONE; |
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44 } |
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45 |
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46 if (bl->waiting < bl->max_waiting) { |
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47 bl->waiting++; |
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509 | 49 #if 0 |
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50 ngx_add_timer(bc->event, 1000); |
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51 bc->event->event_handler = bc->event_handler; |
509 | 52 #endif |
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53 |
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54 /* TODO: ngx_handle_level_read_event() */ |
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56 return NGX_AGAIN; |
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57 } |
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59 return NGX_ERROR; |
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60 } |
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61 |
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1565 | 63 int ngx_http_busy_lock_cacheable(ngx_http_busy_lock_t *bl, |
64 ngx_http_busy_lock_ctx_t *bc, int lock) | |
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65 { |
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66 int rc; |
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1565 | 68 rc = ngx_http_busy_lock_look_cacheable(bl, bc, lock); |
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70 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, bc->event->log, 0, |
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71 "http busylock: %d w:%d mw::%d", |
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72 rc, bl->waiting, bl->max_waiting); |
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73 |
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74 if (rc == NGX_OK) { /* no the same request, there's free slot */ |
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75 return NGX_OK; |
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76 } |
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78 if (rc == NGX_ERROR && !lock) { /* no the same request, no free slot */ |
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79 return NGX_OK; |
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80 } |
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81 |
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82 /* rc == NGX_AGAIN: the same request */ |
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83 |
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84 if (bc->time) { |
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85 if (bc->time < bl->timeout) { |
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86 ngx_add_timer(bc->event, 1000); |
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87 return NGX_AGAIN; |
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88 } |
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89 |
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90 bl->waiting--; |
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91 return NGX_DONE; |
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92 |
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93 } |
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94 |
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95 if (bl->timeout == 0) { |
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96 return NGX_DONE; |
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97 } |
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98 |
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99 if (bl->waiting < bl->max_waiting) { |
509 | 100 #if 0 |
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101 bl->waiting++; |
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102 ngx_add_timer(bc->event, 1000); |
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103 bc->event->event_handler = bc->event_handler; |
509 | 104 #endif |
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105 |
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106 /* TODO: ngx_handle_level_read_event() */ |
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107 |
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108 return NGX_AGAIN; |
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109 } |
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110 |
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111 return NGX_ERROR; |
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112 } |
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113 |
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114 |
178
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115 void ngx_http_busy_unlock(ngx_http_busy_lock_t *bl, |
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116 ngx_http_busy_lock_ctx_t *bc) |
176
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117 { |
189
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118 if (bl == NULL) { |
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119 return; |
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120 } |
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121 |
178
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122 if (bl->md5) { |
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123 bl->md5_mask[bc->slot / 8] &= ~(1 << (bc->slot & 7)); |
1565 | 124 bl->cacheable--; |
178
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125 } |
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126 |
176
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127 bl->busy--; |
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128 } |
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129 |
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130 |
1565 | 131 static int ngx_http_busy_lock_look_cacheable(ngx_http_busy_lock_t *bl, |
132 ngx_http_busy_lock_ctx_t *bc, | |
133 int lock) | |
176
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134 { |
1565 | 135 int i, b, cacheable, free; |
175
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136 u_int mask; |
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137 |
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138 b = 0; |
1565 | 139 cacheable = 0; |
175
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140 free = -1; |
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141 |
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142 #if (NGX_SUPPRESS_WARN) |
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143 mask = 0; |
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144 #endif |
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145 |
176
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146 for (i = 0; i < bl->max_busy; i++) { |
175
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147 |
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148 if ((b & 7) == 0) { |
176
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149 mask = bl->md5_mask[i / 8]; |
175
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150 } |
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151 |
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152 if (mask & 1) { |
176
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153 if (ngx_memcmp(&bl->md5[i * 16], bc->md5, 16) == 0) { |
175
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154 return NGX_AGAIN; |
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155 } |
1565 | 156 cacheable++; |
175
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157 |
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158 } else if (free == -1) { |
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159 free = i; |
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160 } |
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161 |
176
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162 #if 1 |
1565 | 163 if (cacheable == bl->cacheable) { |
164 if (free == -1 && cacheable < bl->max_busy) { | |
175
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165 free = i + 1; |
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166 } |
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167 |
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168 break; |
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169 } |
176
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170 #endif |
175
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171 |
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172 mask >>= 1; |
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173 b++; |
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174 } |
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175 |
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176 if (free == -1) { |
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177 return NGX_ERROR; |
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178 } |
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179 |
176
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180 if (lock) { |
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181 if (bl->busy == bl->max_busy) { |
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182 return NGX_ERROR; |
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183 } |
175
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184 |
176
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185 ngx_memcpy(&bl->md5[free * 16], bc->md5, 16); |
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186 bl->md5_mask[free / 8] |= 1 << (free & 7); |
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187 bc->slot = free; |
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188 |
1565 | 189 bl->cacheable++; |
176
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190 bl->busy++; |
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191 } |
175
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192 |
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193 return NGX_OK; |
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194 } |
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195 |
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196 |
174
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197 char *ngx_http_set_busy_lock_slot(ngx_conf_t *cf, ngx_command_t *cmd, |
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198 void *conf) |
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199 { |
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200 char *p = conf; |
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201 |
290
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nginx-0.0.2-2004-03-16-10:10:12 import
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276
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|
202 ngx_uint_t i, dup, invalid; |
176
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203 ngx_str_t *value, line; |
174
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204 ngx_http_busy_lock_t *bl, **blp; |
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205 |
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206 blp = (ngx_http_busy_lock_t **) (p + cmd->offset); |
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207 if (*blp) { |
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208 return "is duplicate"; |
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209 } |
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210 |
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|
211 /* ngx_calloc_shared() */ |
501 | 212 bl = ngx_pcalloc(cf->pool, sizeof(ngx_http_busy_lock_t)); |
213 if (bl == NULL) { | |
174
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214 return NGX_CONF_ERROR; |
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215 } |
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216 *blp = bl; |
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217 |
272
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257
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|
218 /* ngx_calloc_shared() */ |
501 | 219 bl->mutex = ngx_pcalloc(cf->pool, sizeof(ngx_event_mutex_t)); |
220 if (bl->mutex == NULL) { | |
272
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221 return NGX_CONF_ERROR; |
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|
222 } |
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223 |
176
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224 dup = 0; |
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225 invalid = 0; |
195
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nginx-0.0.1-2003-11-25-23:44:56 import
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parents:
193
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226 value = cf->args->elts; |
174
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227 |
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228 for (i = 1; i < cf->args->nelts; i++) { |
174
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229 |
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230 if (value[i].data[1] != '=') { |
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231 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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232 "invalid value \"%s\"", value[i].data); |
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233 return NGX_CONF_ERROR; |
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234 } |
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235 |
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236 switch (value[i].data[0]) { |
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237 |
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238 case 'b': |
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239 if (bl->max_busy) { |
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240 dup = 1; |
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241 break; |
174
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242 } |
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243 |
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244 bl->max_busy = ngx_atoi(value[i].data + 2, value[i].len - 2); |
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245 if (bl->max_busy == NGX_ERROR) { |
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246 invalid = 1; |
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247 break; |
174
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248 } |
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249 |
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250 continue; |
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251 |
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252 case 'w': |
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253 if (bl->max_waiting) { |
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254 dup = 1; |
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255 break; |
174
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256 } |
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257 |
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258 bl->max_waiting = ngx_atoi(value[i].data + 2, value[i].len - 2); |
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259 if (bl->max_waiting == NGX_ERROR) { |
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260 invalid = 1; |
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261 break; |
174
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262 } |
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263 |
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264 continue; |
176
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265 |
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266 case 't': |
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267 if (bl->timeout) { |
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268 dup = 1; |
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269 break; |
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270 } |
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271 |
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272 line.len = value[i].len - 2; |
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273 line.data = value[i].data + 2; |
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274 |
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275 bl->timeout = ngx_parse_time(&line, 1); |
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276 if (bl->timeout == NGX_ERROR) { |
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277 invalid = 1; |
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278 break; |
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279 } |
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280 |
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281 continue; |
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282 |
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283 default: |
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284 invalid = 1; |
174
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285 } |
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286 |
176
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287 if (dup) { |
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288 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
176
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289 "duplicate value \"%s\"", value[i].data); |
174
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290 return NGX_CONF_ERROR; |
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291 } |
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292 |
176
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293 if (invalid) { |
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294 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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295 "invalid value \"%s\"", value[i].data); |
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296 return NGX_CONF_ERROR; |
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297 } |
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298 } |
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299 |
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300 if (bl->timeout == 0 && bl->max_waiting) { |
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301 ngx_conf_log_error(NGX_LOG_WARN, cf, 0, |
276
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302 "busy lock waiting is useless with zero timeout, ignoring"); |
176
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303 } |
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304 |
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305 return NGX_CONF_OK; |
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306 } |