Mercurial > hg > nginx-quic
annotate src/http/ngx_http_busy_lock.c @ 445:f26432a1935a
nginx-0.1.0-2004-09-30-10:38:49 import
author | Igor Sysoev <igor@sysoev.ru> |
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date | Thu, 30 Sep 2004 06:38:49 +0000 |
parents | 42d11f017717 |
children | d4ea69372b94 |
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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13 static int ngx_http_busy_lock_look_cachable(ngx_http_busy_lock_t *bl, |
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14 ngx_http_busy_lock_ctx_t *bc, |
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15 int lock); |
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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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28 return NGX_OK; |
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29 } |
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30 |
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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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39 |
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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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49 ngx_add_timer(bc->event, 1000); |
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50 bc->event->event_handler = bc->event_handler; |
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51 |
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52 /* TODO: ngx_handle_level_read_event() */ |
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54 return NGX_AGAIN; |
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55 } |
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57 return NGX_ERROR; |
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58 } |
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61 int ngx_http_busy_lock_cachable(ngx_http_busy_lock_t *bl, |
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62 ngx_http_busy_lock_ctx_t *bc, int lock) |
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63 { |
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64 int rc; |
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65 |
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66 rc = ngx_http_busy_lock_look_cachable(bl, bc, lock); |
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68 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, bc->event->log, 0, |
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69 "http busylock: %d w:%d mw::%d", |
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70 rc, bl->waiting, bl->max_waiting); |
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71 |
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72 if (rc == NGX_OK) { /* no the same request, there's free slot */ |
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73 return NGX_OK; |
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74 } |
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75 |
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76 if (rc == NGX_ERROR && !lock) { /* no the same request, no free slot */ |
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77 return NGX_OK; |
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78 } |
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79 |
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80 /* rc == NGX_AGAIN: the same request */ |
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81 |
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82 if (bc->time) { |
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83 if (bc->time < bl->timeout) { |
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84 ngx_add_timer(bc->event, 1000); |
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85 return NGX_AGAIN; |
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86 } |
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87 |
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88 bl->waiting--; |
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89 return NGX_DONE; |
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90 |
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91 } |
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92 |
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93 if (bl->timeout == 0) { |
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94 return NGX_DONE; |
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95 } |
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96 |
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97 if (bl->waiting < bl->max_waiting) { |
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98 bl->waiting++; |
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99 ngx_add_timer(bc->event, 1000); |
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100 bc->event->event_handler = bc->event_handler; |
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101 |
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102 /* TODO: ngx_handle_level_read_event() */ |
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103 |
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104 return NGX_AGAIN; |
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105 } |
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106 |
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107 return NGX_ERROR; |
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108 } |
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109 |
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110 |
178
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111 void ngx_http_busy_unlock(ngx_http_busy_lock_t *bl, |
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112 ngx_http_busy_lock_ctx_t *bc) |
176
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113 { |
189
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114 if (bl == NULL) { |
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115 return; |
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116 } |
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117 |
178
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118 if (bl->md5) { |
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119 bl->md5_mask[bc->slot / 8] &= ~(1 << (bc->slot & 7)); |
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120 bl->cachable--; |
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121 } |
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122 |
176
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123 bl->busy--; |
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124 } |
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125 |
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126 |
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127 static int ngx_http_busy_lock_look_cachable(ngx_http_busy_lock_t *bl, |
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128 ngx_http_busy_lock_ctx_t *bc, |
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129 int lock) |
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130 { |
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131 int i, b, cachable, free; |
175
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132 u_int mask; |
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133 |
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134 b = 0; |
176
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135 cachable = 0; |
175
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136 free = -1; |
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137 |
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138 #if (NGX_SUPPRESS_WARN) |
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139 mask = 0; |
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140 #endif |
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141 |
176
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142 for (i = 0; i < bl->max_busy; i++) { |
175
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143 |
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144 if ((b & 7) == 0) { |
176
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145 mask = bl->md5_mask[i / 8]; |
175
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146 } |
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147 |
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148 if (mask & 1) { |
176
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149 if (ngx_memcmp(&bl->md5[i * 16], bc->md5, 16) == 0) { |
175
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150 return NGX_AGAIN; |
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151 } |
176
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152 cachable++; |
175
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153 |
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154 } else if (free == -1) { |
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155 free = i; |
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156 } |
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157 |
176
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158 #if 1 |
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159 if (cachable == bl->cachable) { |
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160 if (free == -1 && cachable < bl->max_busy) { |
175
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161 free = i + 1; |
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162 } |
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163 |
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164 break; |
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165 } |
176
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166 #endif |
175
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167 |
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168 mask >>= 1; |
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169 b++; |
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170 } |
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171 |
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172 if (free == -1) { |
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173 return NGX_ERROR; |
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174 } |
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175 |
176
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176 if (lock) { |
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177 if (bl->busy == bl->max_busy) { |
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178 return NGX_ERROR; |
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179 } |
175
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180 |
176
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181 ngx_memcpy(&bl->md5[free * 16], bc->md5, 16); |
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182 bl->md5_mask[free / 8] |= 1 << (free & 7); |
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183 bc->slot = free; |
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184 |
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185 bl->cachable++; |
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186 bl->busy++; |
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187 } |
175
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188 |
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189 return NGX_OK; |
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190 } |
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191 |
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192 |
174
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193 char *ngx_http_set_busy_lock_slot(ngx_conf_t *cf, ngx_command_t *cmd, |
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194 void *conf) |
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195 { |
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196 char *p = conf; |
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197 |
290
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198 ngx_uint_t i, dup, invalid; |
176
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199 ngx_str_t *value, line; |
174
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200 ngx_http_busy_lock_t *bl, **blp; |
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201 |
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202 blp = (ngx_http_busy_lock_t **) (p + cmd->offset); |
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203 if (*blp) { |
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204 return "is duplicate"; |
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205 } |
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206 |
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207 /* ngx_calloc_shared() */ |
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208 if (!(bl = ngx_pcalloc(cf->pool, sizeof(ngx_http_busy_lock_t)))) { |
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209 return NGX_CONF_ERROR; |
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210 } |
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211 *blp = bl; |
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212 |
272
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213 /* ngx_calloc_shared() */ |
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214 if (!(bl->mutex = ngx_pcalloc(cf->pool, sizeof(ngx_event_mutex_t)))) { |
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215 return NGX_CONF_ERROR; |
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216 } |
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217 |
176
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218 dup = 0; |
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219 invalid = 0; |
195
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220 value = cf->args->elts; |
174
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221 |
176
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222 for (i = 1; i < cf->args->nelts; i++) { |
174
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223 |
176
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224 if (value[i].data[1] != '=') { |
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225 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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226 "invalid value \"%s\"", value[i].data); |
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227 return NGX_CONF_ERROR; |
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228 } |
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229 |
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230 switch (value[i].data[0]) { |
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231 |
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232 case 'b': |
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233 if (bl->max_busy) { |
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234 dup = 1; |
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235 break; |
174
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236 } |
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237 |
176
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238 bl->max_busy = ngx_atoi(value[i].data + 2, value[i].len - 2); |
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239 if (bl->max_busy == NGX_ERROR) { |
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240 invalid = 1; |
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241 break; |
174
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242 } |
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243 |
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244 continue; |
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245 |
176
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246 case 'w': |
174
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247 if (bl->max_waiting) { |
176
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248 dup = 1; |
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249 break; |
174
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250 } |
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251 |
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252 bl->max_waiting = ngx_atoi(value[i].data + 2, value[i].len - 2); |
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253 if (bl->max_waiting == NGX_ERROR) { |
176
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254 invalid = 1; |
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255 break; |
174
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256 } |
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257 |
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258 continue; |
176
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259 |
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260 case 't': |
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261 if (bl->timeout) { |
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262 dup = 1; |
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263 break; |
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264 } |
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265 |
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266 line.len = value[i].len - 2; |
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267 line.data = value[i].data + 2; |
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268 |
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269 bl->timeout = ngx_parse_time(&line, 1); |
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270 if (bl->timeout == NGX_ERROR) { |
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271 invalid = 1; |
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272 break; |
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273 } |
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274 |
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275 continue; |
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276 |
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277 default: |
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278 invalid = 1; |
174
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279 } |
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280 |
176
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281 if (dup) { |
174
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282 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
176
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283 "duplicate value \"%s\"", value[i].data); |
174
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284 return NGX_CONF_ERROR; |
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285 } |
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286 |
176
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287 if (invalid) { |
174
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288 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
176
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289 "invalid 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 } |
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293 |
176
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294 if (bl->timeout == 0 && bl->max_waiting) { |
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295 ngx_conf_log_error(NGX_LOG_WARN, cf, 0, |
276
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|
296 "busy lock waiting is useless with zero timeout, ignoring"); |
176
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297 } |
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298 |
174
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299 return NGX_CONF_OK; |
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300 } |