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160
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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 #if (NGX_HAVE_ATOMIC_OPS)
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12
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13
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650
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14 static void ngx_shmtx_wakeup(ngx_shmtx_t *mtx);
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15
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16
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160
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17 ngx_int_t
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650
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18 ngx_shmtx_create(ngx_shmtx_t *mtx, ngx_shmtx_sh_t *addr, u_char *name)
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160
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19 {
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650
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20 mtx->lock = &addr->lock;
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160
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21
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624
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22 if (mtx->spin == (ngx_uint_t) -1) {
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23 return NGX_OK;
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24 }
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25
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26 mtx->spin = 2048;
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27
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28 #if (NGX_HAVE_POSIX_SEM)
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29
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650
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30 mtx->wait = &addr->wait;
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31
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624
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32 if (sem_init(&mtx->sem, 1, 0) == -1) {
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33 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno,
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34 "sem_init() failed");
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35 } else {
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36 mtx->semaphore = 1;
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37 }
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38
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39 #endif
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40
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160
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41 return NGX_OK;
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42 }
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43
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624
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44
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45 void
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46 ngx_shmtx_destory(ngx_shmtx_t *mtx)
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47 {
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48 #if (NGX_HAVE_POSIX_SEM)
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49
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50 if (mtx->semaphore) {
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51 if (sem_destroy(&mtx->sem) == -1) {
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52 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno,
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53 "sem_destroy() failed");
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54 }
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55 }
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56
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57 #endif
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58 }
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59
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60
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61 ngx_uint_t
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62 ngx_shmtx_trylock(ngx_shmtx_t *mtx)
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63 {
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650
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64 return (*mtx->lock == 0 && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid));
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624
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65 }
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66
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67
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68 void
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69 ngx_shmtx_lock(ngx_shmtx_t *mtx)
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70 {
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71 ngx_uint_t i, n;
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72
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73 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, "shmtx lock");
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74
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75 for ( ;; ) {
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76
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650
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77 if (*mtx->lock == 0 && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid)) {
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624
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78 return;
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79 }
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80
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81 if (ngx_ncpu > 1) {
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82
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83 for (n = 1; n < mtx->spin; n <<= 1) {
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84
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85 for (i = 0; i < n; i++) {
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86 ngx_cpu_pause();
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87 }
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88
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650
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89 if (*mtx->lock == 0
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90 && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid))
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624
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91 {
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92 return;
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93 }
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94 }
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95 }
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96
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97 #if (NGX_HAVE_POSIX_SEM)
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98
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99 if (mtx->semaphore) {
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650
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100 (void) ngx_atomic_fetch_add(mtx->wait, 1);
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624
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101
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650
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102 if (*mtx->lock == 0 && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid)) {
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103 return;
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104 }
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105
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106 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
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107 "shmtx wait %uA", *mtx->wait);
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624
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108
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650
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109 while (sem_wait(&mtx->sem) == -1) {
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110 ngx_err_t err;
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624
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111
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650
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112 err = ngx_errno;
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624
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113
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650
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114 if (err != NGX_EINTR) {
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115 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, err,
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116 "sem_wait() failed while waiting on shmtx");
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117 break;
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624
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118 }
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119
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120 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
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121 "shmtx awoke");
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122 }
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123
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124 continue;
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125 }
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126
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127 #endif
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128
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129 ngx_sched_yield();
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130 }
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131 }
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132
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133
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134 void
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135 ngx_shmtx_unlock(ngx_shmtx_t *mtx)
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136 {
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137 if (mtx->spin != (ngx_uint_t) -1) {
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138 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, "shmtx unlock");
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139 }
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140
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650
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141 if (ngx_atomic_cmp_set(mtx->lock, ngx_pid, 0)) {
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142 ngx_shmtx_wakeup(mtx);
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143 }
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144 }
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145
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146
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147 ngx_uint_t
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148 ngx_shmtx_force_unlock(ngx_shmtx_t *mtx, ngx_pid_t pid)
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149 {
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150 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
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151 "shmtx forced unlock");
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152
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153 if (ngx_atomic_cmp_set(mtx->lock, pid, 0)) {
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154 ngx_shmtx_wakeup(mtx);
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155 return 1;
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156 }
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157
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158 return 0;
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159 }
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160
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161
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162 static void
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163 ngx_shmtx_wakeup(ngx_shmtx_t *mtx)
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164 {
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165 #if (NGX_HAVE_POSIX_SEM)
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166 ngx_atomic_uint_t wait;
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167
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168 if (!mtx->semaphore) {
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169 return;
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170 }
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171
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624
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172 for ( ;; ) {
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173
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650
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174 wait = *mtx->wait;
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624
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175
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650
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176 if (wait == 0) {
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177 return;
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178 }
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179
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180 if (ngx_atomic_cmp_set(mtx->wait, wait, wait - 1)) {
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624
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181 break;
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182 }
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183 }
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184
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185 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
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650
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186 "shmtx wake %uA", wait);
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624
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187
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188 if (sem_post(&mtx->sem) == -1) {
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189 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno,
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190 "sem_post() failed while wake shmtx");
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191 }
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192
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193 #endif
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194 }
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195
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196
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160
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197 #else
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198
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199
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200 ngx_int_t
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650
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201 ngx_shmtx_create(ngx_shmtx_t *mtx, ngx_shmtx_sh_t *addr, u_char *name)
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160
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202 {
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203 if (mtx->name) {
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204
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205 if (ngx_strcmp(name, mtx->name) == 0) {
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206 mtx->name = name;
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207 return NGX_OK;
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208 }
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209
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210 ngx_shmtx_destory(mtx);
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211 }
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212
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284
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213 mtx->fd = ngx_open_file(name, NGX_FILE_RDWR, NGX_FILE_CREATE_OR_OPEN,
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214 NGX_FILE_DEFAULT_ACCESS);
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160
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215
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216 if (mtx->fd == NGX_INVALID_FILE) {
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258
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217 ngx_log_error(NGX_LOG_EMERG, ngx_cycle->log, ngx_errno,
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160
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218 ngx_open_file_n " \"%s\" failed", name);
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219 return NGX_ERROR;
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220 }
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221
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222 if (ngx_delete_file(name) == NGX_FILE_ERROR) {
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258
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223 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno,
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160
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224 ngx_delete_file_n " \"%s\" failed", name);
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225 }
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226
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227 mtx->name = name;
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228
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229 return NGX_OK;
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230 }
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231
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232
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233 void
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234 ngx_shmtx_destory(ngx_shmtx_t *mtx)
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235 {
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236 if (ngx_close_file(mtx->fd) == NGX_FILE_ERROR) {
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258
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237 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno,
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160
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238 ngx_close_file_n " \"%s\" failed", mtx->name);
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239 }
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240 }
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241
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242
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624
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243 ngx_uint_t
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244 ngx_shmtx_trylock(ngx_shmtx_t *mtx)
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245 {
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246 ngx_err_t err;
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247
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248 err = ngx_trylock_fd(mtx->fd);
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249
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250 if (err == 0) {
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251 return 1;
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252 }
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253
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254 if (err == NGX_EAGAIN) {
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255 return 0;
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256 }
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257
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258 #if __osf__ /* Tru64 UNIX */
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259
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260 if (err == NGX_EACCESS) {
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261 return 0;
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262 }
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263
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160
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264 #endif
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624
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265
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266 ngx_log_abort(err, ngx_trylock_fd_n " %s failed", mtx->name);
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267
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268 return 0;
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269 }
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270
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271
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272 void
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273 ngx_shmtx_lock(ngx_shmtx_t *mtx)
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274 {
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275 ngx_err_t err;
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276
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277 err = ngx_lock_fd(mtx->fd);
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278
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279 if (err == 0) {
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280 return;
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281 }
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282
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283 ngx_log_abort(err, ngx_lock_fd_n " %s failed", mtx->name);
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284 }
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285
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286
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287 void
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288 ngx_shmtx_unlock(ngx_shmtx_t *mtx)
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289 {
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290 ngx_err_t err;
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291
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292 err = ngx_unlock_fd(mtx->fd);
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293
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294 if (err == 0) {
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295 return;
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296 }
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297
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298 ngx_log_abort(err, ngx_unlock_fd_n " %s failed", mtx->name);
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299 }
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300
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650
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301
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302 ngx_uint_t
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303 ngx_shmtx_force_unlock(ngx_shmtx_t *mtx, ngx_pid_t pid)
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304 {
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305 return 0;
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306 }
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307
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624
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308 #endif
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