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annotate src/os/unix/ngx_thread_mutex.c @ 9274:46ecad404a29 default tip

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Mail: reset imap tag to empty after authentication attempt. We need to reset the imap tag to empty after an authentication attempt completes, otherwise if the next line parsed is incomplete with no tag (e.g. empty line) then we use the "tag" from the previous buffer which is now definitely wrong and has been partially overwritten with the most recently read data (e.g. CRLF). An example before this patch: S: * OK IMAP4 ready C: foobar login a b S: foobar NO Incorrect username or password. C: S: S: obar BAD invalid command Then with this patch: S: * OK IMAP4 ready C: foobar login a b S: foobar NO Incorrect username or password. C: S: * BAD invalid command
author Rob Mueller <robm@fastmailteam.com>
date Wed, 15 May 2024 10:06:00 +0300
parents 022ea0d17177
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 overridden 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 return NGX_OK;
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112 }
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113
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114
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115 ngx_int_t
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116 ngx_thread_mutex_destroy(ngx_thread_mutex_t *mtx, ngx_log_t *log)
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117 {
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118 ngx_err_t err;
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119
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120 err = pthread_mutex_destroy(mtx);
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121 if (err != 0) {
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122 ngx_log_error(NGX_LOG_ALERT, log, err,
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123 "pthread_mutex_destroy() failed");
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124 return NGX_ERROR;
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125 }
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126
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127 return NGX_OK;
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128 }
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129
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130
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131 ngx_int_t
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132 ngx_thread_mutex_lock(ngx_thread_mutex_t *mtx, ngx_log_t *log)
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133 {
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134 ngx_err_t err;
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135
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136 err = pthread_mutex_lock(mtx);
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137 if (err == 0) {
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138 return NGX_OK;
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139 }
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140
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141 ngx_log_error(NGX_LOG_ALERT, log, err, "pthread_mutex_lock() failed");
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142
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143 return NGX_ERROR;
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144 }
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145
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146
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147 ngx_int_t
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148 ngx_thread_mutex_unlock(ngx_thread_mutex_t *mtx, ngx_log_t *log)
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149 {
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150 ngx_err_t err;
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151
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152 err = pthread_mutex_unlock(mtx);
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153
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154 #if 0
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155 ngx_time_update();
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156 #endif
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157
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158 if (err == 0) {
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159 return NGX_OK;
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160 }
466bd63b63d1 Thread pools implementation.
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161
466bd63b63d1 Thread pools implementation.
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162 ngx_log_error(NGX_LOG_ALERT, log, err, "pthread_mutex_unlock() failed");
466bd63b63d1 Thread pools implementation.
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163
466bd63b63d1 Thread pools implementation.
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164 return NGX_ERROR;
466bd63b63d1 Thread pools implementation.
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165 }