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0
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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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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 static ngx_uint_t nthreads;
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12 static ngx_uint_t max_threads;
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13
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14
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15 static pthread_attr_t thr_attr;
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16
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17
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10
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18 ngx_err_t ngx_create_thread(ngx_tid_t *tid, void* (*func)(void *arg), void *arg,
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19 ngx_log_t *log)
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0
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20 {
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21 int err;
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22
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23 if (nthreads >= max_threads) {
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24 ngx_log_error(NGX_LOG_CRIT, log, 0,
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10
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25 "no more than %ui threads can be created", max_threads);
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0
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26 return NGX_ERROR;
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27 }
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28
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29 err = pthread_create(tid, &thr_attr, func, arg);
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30
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31 if (err != 0) {
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32 ngx_log_error(NGX_LOG_ALERT, log, err, "pthread_create() failed");
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33 return err;
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34 }
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35
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36 ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0,
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10
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37 "thread is created: " NGX_TID_T_FMT, *tid);
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0
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38
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39 nthreads++;
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40
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41 return err;
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42 }
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43
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44
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45 ngx_int_t ngx_init_threads(int n, size_t size, ngx_cycle_t *cycle)
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46 {
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47 int err;
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48
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49 max_threads = n;
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50
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51 err = pthread_attr_init(&thr_attr);
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52
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53 if (err != 0) {
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54 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
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55 "pthread_attr_init() failed");
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56 return NGX_ERROR;
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57 }
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58
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59 err = pthread_attr_setstacksize(&thr_attr, size);
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60
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61 if (err != 0) {
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62 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
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63 "pthread_attr_setstacksize() failed");
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64 return NGX_ERROR;
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65 }
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66
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67 ngx_threaded = 1;
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68
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69 return NGX_OK;
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70 }
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71
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72
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10
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73 ngx_mutex_t *ngx_mutex_init(ngx_log_t *log, ngx_uint_t flags)
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0
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74 {
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75 int err;
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76 ngx_mutex_t *m;
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77
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78 if (!(m = ngx_alloc(sizeof(ngx_mutex_t), log))) {
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79 return NULL;
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80 }
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81
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82 m->log = log;
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83
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84 err = pthread_mutex_init(&m->mutex, NULL);
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85
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86 if (err != 0) {
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87 ngx_log_error(NGX_LOG_ALERT, m->log, err,
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88 "pthread_mutex_init() failed");
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89 return NULL;
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90 }
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91
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92 return m;
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93 }
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94
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95
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96 void ngx_mutex_destroy(ngx_mutex_t *m)
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97 {
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98 int err;
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99
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100 err = pthread_mutex_destroy(&m->mutex);
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101
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102 if (err != 0) {
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103 ngx_log_error(NGX_LOG_ALERT, m->log, err,
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10
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104 "pthread_mutex_destroy(%p) failed", m);
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0
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105 }
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106
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107 ngx_free(m);
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108 }
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109
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110
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111 ngx_int_t ngx_mutex_lock(ngx_mutex_t *m)
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112 {
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113 int err;
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114
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115 if (!ngx_threaded) {
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116 return NGX_OK;
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117 }
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118
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10
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119 ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "lock mutex %p", m);
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0
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120
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121 err = pthread_mutex_lock(&m->mutex);
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122
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123 if (err != 0) {
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124 ngx_log_error(NGX_LOG_ALERT, m->log, err,
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10
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125 "pthread_mutex_lock(%p) failed", m);
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0
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126 return NGX_ERROR;
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127 }
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128
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10
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129 ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "mutex %p is locked", m);
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0
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130
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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 ngx_mutex_trylock(ngx_mutex_t *m)
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136 {
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137 int err;
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138
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139 if (!ngx_threaded) {
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140 return NGX_OK;
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141 }
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142
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10
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143 ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "try lock mutex %p", m);
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0
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144
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145 err = pthread_mutex_trylock(&m->mutex);
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146
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147 if (err == NGX_EBUSY) {
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148 return NGX_AGAIN;
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149 }
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150
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151 if (err != 0) {
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152 ngx_log_error(NGX_LOG_ALERT, m->log, err,
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10
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153 "pthread_mutex_trylock(%p) failed", m);
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0
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154 return NGX_ERROR;
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155 }
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156
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10
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157 ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "mutex %p is locked", m);
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0
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158
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159 return NGX_OK;
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160 }
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161
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162
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163 ngx_int_t ngx_mutex_unlock(ngx_mutex_t *m)
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164 {
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165 int err;
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166
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167 if (!ngx_threaded) {
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168 return NGX_OK;
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169 }
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170
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10
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171 ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "unlock mutex %p", m);
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0
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172
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173 err = pthread_mutex_unlock(&m->mutex);
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174
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175 if (err != 0) {
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176 ngx_log_error(NGX_LOG_ALERT, m->log, err,
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10
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177 "pthread_mutex_unlock(%p) failed", m);
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0
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178 return NGX_ERROR;
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179 }
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180
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10
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181 ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "mutex %p is unlocked", m);
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0
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182
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183 return NGX_OK;
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184 }
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185
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186
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187 ngx_cond_t *ngx_cond_init(ngx_log_t *log)
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188 {
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189 int err;
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190 ngx_cond_t *cv;
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191
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192 if (!(cv = ngx_alloc(sizeof(ngx_cond_t), log))) {
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193 return NULL;
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194 }
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195
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196 cv->log = log;
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197
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198 err = pthread_cond_init(&cv->cond, NULL);
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199
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200 if (err != 0) {
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201 ngx_log_error(NGX_LOG_ALERT, cv->log, err,
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202 "pthread_cond_init() failed");
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203 return NULL;
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204 }
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205
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206 return cv;
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207 }
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208
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209
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210 void ngx_cond_destroy(ngx_cond_t *cv)
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211 {
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212 int err;
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213
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214 err = pthread_cond_destroy(&cv->cond);
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215
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216 if (err != 0) {
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217 ngx_log_error(NGX_LOG_ALERT, cv->log, err,
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10
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218 "pthread_cond_destroy(%p) failed", cv);
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0
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219 }
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220
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221 ngx_free(cv);
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222 }
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223
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224
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225 ngx_int_t ngx_cond_wait(ngx_cond_t *cv, ngx_mutex_t *m)
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226 {
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227 int err;
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228
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10
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229 ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0, "cv %p wait", cv);
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0
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230
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231 err = pthread_cond_wait(&cv->cond, &m->mutex);
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232
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233 if (err != 0) {
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234 ngx_log_error(NGX_LOG_ALERT, cv->log, err,
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10
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235 "pthread_cond_wait(%p) failed", cv);
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0
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236 return NGX_ERROR;
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237 }
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238
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10
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239 ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0, "cv %p is waked up", cv);
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0
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240
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10
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241 ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "mutex %p is locked", m);
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0
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242
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243 return NGX_OK;
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244 }
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245
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246
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247 ngx_int_t ngx_cond_signal(ngx_cond_t *cv)
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248 {
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249 int err;
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250
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10
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251 ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0, "cv %p to signal", cv);
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0
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252
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253 err = pthread_cond_signal(&cv->cond);
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254
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255 if (err != 0) {
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256 ngx_log_error(NGX_LOG_ALERT, cv->log, err,
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10
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257 "pthread_cond_signal(%p) failed", cv);
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0
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258 return NGX_ERROR;
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259 }
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260
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10
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261 ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0, "cv %p is signaled", cv);
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0
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262
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263 return NGX_OK;
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264 }
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