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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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18 int 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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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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25 "no more than %d threads can be created", max_threads);
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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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37 "thread is created: " TID_T_FMT, *tid);
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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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73 ngx_mutex_t *ngx_mutex_init(ngx_log_t *log, uint flags)
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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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104 "pthread_mutex_destroy(" PTR_FMT ") failed", m);
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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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119 ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "lock mutex " PTR_FMT, m);
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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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125 "pthread_mutex_lock(" PTR_FMT ") failed", m);
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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_MUTEX, m->log, 0,
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130 "mutex " PTR_FMT " is locked", m);
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131
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132 return NGX_OK;
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133 }
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134
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135
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136 ngx_int_t ngx_mutex_trylock(ngx_mutex_t *m)
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137 {
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138 int err;
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139
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140 if (!ngx_threaded) {
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141 return NGX_OK;
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142 }
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143
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144 ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0,
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145 "try lock mutex " PTR_FMT, m);
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146
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147 err = pthread_mutex_trylock(&m->mutex);
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148
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149 if (err == NGX_EBUSY) {
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150 return NGX_AGAIN;
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151 }
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152
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153 if (err != 0) {
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154 ngx_log_error(NGX_LOG_ALERT, m->log, err,
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155 "pthread_mutex_trylock(" PTR_FMT ") failed", m);
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156 return NGX_ERROR;
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157 }
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158
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159 ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0,
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160 "mutex " PTR_FMT " is locked", m);
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161
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162 return NGX_OK;
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163 }
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164
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165
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166 ngx_int_t ngx_mutex_unlock(ngx_mutex_t *m)
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167 {
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168 int err;
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169
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170 if (!ngx_threaded) {
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171 return NGX_OK;
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172 }
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173
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174 ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "unlock mutex " PTR_FMT, m);
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175
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176 err = pthread_mutex_unlock(&m->mutex);
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177
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178 if (err != 0) {
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179 ngx_log_error(NGX_LOG_ALERT, m->log, err,
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180 "pthread_mutex_unlock(" PTR_FMT ") failed", m);
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181 return NGX_ERROR;
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182 }
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183
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184 ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0,
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185 "mutex " PTR_FMT " is unlocked", m);
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186
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187 return NGX_OK;
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188 }
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189
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190
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191 ngx_cond_t *ngx_cond_init(ngx_log_t *log)
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192 {
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193 int err;
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194 ngx_cond_t *cv;
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195
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196 if (!(cv = ngx_alloc(sizeof(ngx_cond_t), log))) {
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197 return NULL;
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198 }
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199
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200 cv->log = log;
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201
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202 err = pthread_cond_init(&cv->cond, NULL);
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203
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204 if (err != 0) {
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205 ngx_log_error(NGX_LOG_ALERT, cv->log, err,
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206 "pthread_cond_init() failed");
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207 return NULL;
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208 }
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209
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210 return cv;
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211 }
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212
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213
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214 void ngx_cond_destroy(ngx_cond_t *cv)
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215 {
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216 int err;
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217
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218 err = pthread_cond_destroy(&cv->cond);
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219
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220 if (err != 0) {
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221 ngx_log_error(NGX_LOG_ALERT, cv->log, err,
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222 "pthread_cond_destroy(" PTR_FMT ") failed", cv);
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223 }
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224
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225 ngx_free(cv);
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226 }
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227
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228
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229 ngx_int_t ngx_cond_wait(ngx_cond_t *cv, ngx_mutex_t *m)
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230 {
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231 int err;
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232
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233 ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0,
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234 "cv " PTR_FMT " wait", cv);
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235
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236 err = pthread_cond_wait(&cv->cond, &m->mutex);
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237
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238 if (err != 0) {
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239 ngx_log_error(NGX_LOG_ALERT, cv->log, err,
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240 "pthread_cond_wait(" PTR_FMT ") failed", cv);
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241 return NGX_ERROR;
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242 }
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243
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244 ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0,
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245 "cv " PTR_FMT " is waked up", cv);
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246
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247 ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0,
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248 "mutex " PTR_FMT " is locked", m);
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249
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250 return NGX_OK;
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251 }
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252
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253
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254 ngx_int_t ngx_cond_signal(ngx_cond_t *cv)
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255 {
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256 int err;
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257
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258 ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0,
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259 "cv " PTR_FMT " to signal", cv);
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260
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261 err = pthread_cond_signal(&cv->cond);
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262
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263 if (err != 0) {
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264 ngx_log_error(NGX_LOG_ALERT, cv->log, err,
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265 "pthread_cond_signal(" PTR_FMT ") failed", cv);
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266 return NGX_ERROR;
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267 }
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268
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269 ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0,
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270 "cv " PTR_FMT " is signaled", cv);
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271
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272 return NGX_OK;
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273 }
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