Mercurial > hg > nginx
annotate src/os/unix/ngx_thread_mutex.c @ 8837:8f0f6407ae23 quic
QUIC: Stateless Reset Token debug logging cleanup.
author | Sergey Kandaurov <pluknet@nginx.com> |
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date | Tue, 24 Aug 2021 14:41:31 +0300 |
parents | 022ea0d17177 |
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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. |
6585 | 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 } |
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161 |
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162 ngx_log_error(NGX_LOG_ALERT, log, err, "pthread_mutex_unlock() failed"); |
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163 |
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164 return NGX_ERROR; |
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165 } |