Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_thread_mutex.c @ 6469:7cdf612fd58c
Win32: replaced NGX_EXDEV with more appropriate error code.
Correct error code for NGX_EXDEV on Windows is ERROR_NOT_SAME_DEVICE,
"The system cannot move the file to a different disk drive".
Previously used ERROR_WRONG_DISK is about wrong diskette in the drive and
is not appropriate.
There is no real difference though, as MoveFile() is able to copy files
between disk drives, and will fail with ERROR_ACCESS_DENIED when asked
to copy directories. The ERROR_NOT_SAME_DEVICE error is only used
by MoveFileEx() when called without the MOVEFILE_COPY_ALLOWED flag.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Tue, 29 Mar 2016 09:52:15 +0300 |
parents | 466bd63b63d1 |
children | e511e3d581bb |
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 * Copyright (C) Nginx, Inc. |
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5 */ |
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6 |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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9 |
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10 |
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11 /* |
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12 * All modern pthread mutex implementations try to acquire a lock |
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13 * atomically in userland before going to sleep in kernel. Some |
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14 * spins before the sleeping. |
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15 * |
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16 * In Solaris since version 8 all mutex types spin before sleeping. |
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17 * The default spin count is 1000. It can be overridden using |
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18 * _THREAD_ADAPTIVE_SPIN=100 environment variable. |
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19 * |
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20 * In MacOSX all mutex types spin to acquire a lock protecting a mutex's |
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21 * internals. If the mutex is busy, thread calls Mach semaphore_wait(). |
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22 * |
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23 * |
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24 * PTHREAD_MUTEX_NORMAL lacks deadlock detection and is the fastest |
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25 * mutex type. |
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26 * |
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27 * Linux: No spinning. The internal name PTHREAD_MUTEX_TIMED_NP |
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28 * remains from the times when pthread_mutex_timedlock() was |
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29 * non-standard extension. Alias name: PTHREAD_MUTEX_FAST_NP. |
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30 * FreeBSD: No spinning. |
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31 * |
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32 * |
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33 * PTHREAD_MUTEX_ERRORCHECK is usually as fast as PTHREAD_MUTEX_NORMAL |
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34 * yet has lightweight deadlock detection. |
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35 * |
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36 * Linux: No spinning. The internal name: PTHREAD_MUTEX_ERRORCHECK_NP. |
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37 * FreeBSD: No spinning. |
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38 * |
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39 * |
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40 * PTHREAD_MUTEX_RECURSIVE allows recursive locking. |
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41 * |
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42 * Linux: No spinning. The internal name: PTHREAD_MUTEX_RECURSIVE_NP. |
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43 * FreeBSD: No spinning. |
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44 * |
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45 * |
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46 * PTHREAD_MUTEX_ADAPTIVE_NP spins on SMP systems before sleeping. |
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47 * |
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48 * Linux: No deadlock detection. Dynamically changes a spin count |
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49 * for each mutex from 10 to 100 based on spin count taken |
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50 * previously. |
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51 * FreeBSD: Deadlock detection. The default spin count is 2000. |
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52 * It can be overriden using LIBPTHREAD_SPINLOOPS environment |
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53 * variable or by pthread_mutex_setspinloops_np(). If a lock |
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54 * is still busy, sched_yield() can be called on both UP and |
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55 * SMP systems. The default yield loop count is zero, but |
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56 * it can be set by LIBPTHREAD_YIELDLOOPS environment |
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57 * variable or by pthread_mutex_setyieldloops_np(). |
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58 * Solaris: No PTHREAD_MUTEX_ADAPTIVE_NP. |
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59 * MacOSX: No PTHREAD_MUTEX_ADAPTIVE_NP. |
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60 * |
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61 * |
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62 * PTHREAD_MUTEX_ELISION_NP is a Linux extension to elide locks using |
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63 * Intel Restricted Transactional Memory. It is the most suitable for |
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64 * rwlock pattern access because it allows simultaneous reads without lock. |
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65 * Supported since glibc 2.18. |
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66 * |
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67 * |
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68 * PTHREAD_MUTEX_DEFAULT is default mutex type. |
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69 * |
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70 * Linux: PTHREAD_MUTEX_NORMAL. |
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71 * FreeBSD: PTHREAD_MUTEX_ERRORCHECK. |
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72 * Solaris: PTHREAD_MUTEX_NORMAL. |
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73 * MacOSX: PTHREAD_MUTEX_NORMAL. |
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74 */ |
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75 |
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76 |
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77 ngx_int_t |
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78 ngx_thread_mutex_create(ngx_thread_mutex_t *mtx, ngx_log_t *log) |
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79 { |
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80 ngx_err_t err; |
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81 pthread_mutexattr_t attr; |
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82 |
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83 err = pthread_mutexattr_init(&attr); |
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84 if (err != 0) { |
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85 ngx_log_error(NGX_LOG_EMERG, log, err, |
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86 "pthread_mutexattr_init() failed"); |
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87 return NGX_ERROR; |
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88 } |
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89 |
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90 err = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK); |
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91 if (err != 0) { |
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92 ngx_log_error(NGX_LOG_EMERG, log, err, |
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93 "pthread_mutexattr_settype" |
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94 "(PTHREAD_MUTEX_ERRORCHECK) failed"); |
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95 return NGX_ERROR; |
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96 } |
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97 |
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98 err = pthread_mutex_init(mtx, &attr); |
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99 if (err != 0) { |
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100 ngx_log_error(NGX_LOG_EMERG, log, err, |
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101 "pthread_mutex_init() failed"); |
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102 return NGX_ERROR; |
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103 } |
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104 |
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105 err = pthread_mutexattr_destroy(&attr); |
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106 if (err != 0) { |
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107 ngx_log_error(NGX_LOG_ALERT, log, err, |
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108 "pthread_mutexattr_destroy() failed"); |
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109 } |
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110 |
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111 ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0, |
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112 "pthread_mutex_init(%p)", mtx); |
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113 return NGX_OK; |
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114 } |
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115 |
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116 |
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117 ngx_int_t |
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118 ngx_thread_mutex_destroy(ngx_thread_mutex_t *mtx, ngx_log_t *log) |
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119 { |
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120 ngx_err_t err; |
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121 |
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122 err = pthread_mutex_destroy(mtx); |
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123 if (err != 0) { |
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124 ngx_log_error(NGX_LOG_ALERT, log, err, |
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125 "pthread_mutex_destroy() failed"); |
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126 return NGX_ERROR; |
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127 } |
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128 |
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129 ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0, |
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130 "pthread_mutex_destroy(%p)", mtx); |
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131 return NGX_OK; |
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132 } |
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133 |
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134 |
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135 ngx_int_t |
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136 ngx_thread_mutex_lock(ngx_thread_mutex_t *mtx, ngx_log_t *log) |
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137 { |
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138 ngx_err_t err; |
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139 |
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140 ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0, |
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141 "pthread_mutex_lock(%p) enter", mtx); |
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142 |
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143 err = pthread_mutex_lock(mtx); |
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144 if (err == 0) { |
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145 return NGX_OK; |
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146 } |
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147 |
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148 ngx_log_error(NGX_LOG_ALERT, log, err, "pthread_mutex_lock() failed"); |
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149 |
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150 return NGX_ERROR; |
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151 } |
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152 |
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153 |
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154 ngx_int_t |
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155 ngx_thread_mutex_unlock(ngx_thread_mutex_t *mtx, ngx_log_t *log) |
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156 { |
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157 ngx_err_t err; |
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158 |
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159 err = pthread_mutex_unlock(mtx); |
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160 |
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161 #if 0 |
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162 ngx_time_update(); |
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163 #endif |
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164 |
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165 if (err == 0) { |
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166 ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0, |
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167 "pthread_mutex_unlock(%p) exit", mtx); |
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168 return NGX_OK; |
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169 } |
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170 |
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171 ngx_log_error(NGX_LOG_ALERT, log, err, "pthread_mutex_unlock() failed"); |
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172 |
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173 return NGX_ERROR; |
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174 } |