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annotate src/os/unix/ngx_thread_mutex.c @ 6862:abb0a4189cf7

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Win32: compatiblity with OpenSSL 1.1.0. OpenSSL 1.1.0 now uses normal "nmake; nmake install" instead of using custom "ms\do_ms.bat" script and "ms\nt.mak" makefile. And Configure now requires --prefix to be absolute, and no longer derives --openssldir from prefix (so it's specified explicitly). Generated libraries are now called "libcrypto.lib" and "libssl.lib" instead of "libeay32.lib" and "ssleay32.lib". Appropriate tests added to support both old and new variants. Additionally, openssl/lhash.h now triggers warning C4090 ('function' : different 'const' qualifiers), so the warning was disabled.
author Maxim Dounin <mdounin@mdounin.ru>
date Sat, 24 Dec 2016 18:01:14 +0300
parents e511e3d581bb
children 022ea0d17177
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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466bd63b63d1 Thread pools implementation.
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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 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 }