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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 #include <ngx_event.h>
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10
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11
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340
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12 static ngx_int_t ngx_event_busy_lock_look_cacheable(ngx_event_busy_lock_t *bl,
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112
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13 ngx_event_busy_lock_ctx_t *ctx);
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0
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14 static void ngx_event_busy_lock_handler(ngx_event_t *ev);
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15 static void ngx_event_busy_lock_posted_handler(ngx_event_t *ev);
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16
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17
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18 /*
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19 * NGX_OK: the busy lock is held
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20 * NGX_AGAIN: the all busy locks are held but we will wait the specified time
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21 * NGX_BUSY: ctx->timer == 0: there are many the busy locks
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22 * ctx->timer != 0: there are many the waiting locks
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23 */
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24
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112
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25 ngx_int_t
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26 ngx_event_busy_lock(ngx_event_busy_lock_t *bl, ngx_event_busy_lock_ctx_t *ctx)
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0
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27 {
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28 ngx_int_t rc;
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29
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112
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30 ngx_mutex_lock(bl->mutex);
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0
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31
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32 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ctx->event->log, 0,
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33 "event busy lock: b:%d mb:%d",
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34 bl->busy, bl->max_busy);
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35
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36 if (bl->busy < bl->max_busy) {
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37 bl->busy++;
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154
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38
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0
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39 rc = NGX_OK;
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40
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41 } else if (ctx->timer && bl->waiting < bl->max_waiting) {
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42 bl->waiting++;
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43 ngx_add_timer(ctx->event, ctx->timer);
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58
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44 ctx->event->handler = ngx_event_busy_lock_handler;
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0
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45
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46 if (bl->events) {
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47 bl->last->next = ctx;
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48
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49 } else {
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50 bl->events = ctx;
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51 }
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52
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53 bl->last = ctx;
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54
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55 rc = NGX_AGAIN;
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56
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57 } else {
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58 rc = NGX_BUSY;
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59 }
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60
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61 ngx_mutex_unlock(bl->mutex);
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62
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63 return rc;
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64 }
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65
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66
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112
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67 ngx_int_t
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340
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68 ngx_event_busy_lock_cacheable(ngx_event_busy_lock_t *bl,
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112
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69 ngx_event_busy_lock_ctx_t *ctx)
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0
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70 {
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71 ngx_int_t rc;
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72
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112
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73 ngx_mutex_lock(bl->mutex);
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0
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74
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340
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75 rc = ngx_event_busy_lock_look_cacheable(bl, ctx);
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0
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76
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77 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ctx->event->log, 0,
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78 "event busy lock: %d w:%d mw:%d",
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79 rc, bl->waiting, bl->max_waiting);
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80
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81 /*
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82 * NGX_OK: no the same request, there is free slot and we locked it
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83 * NGX_BUSY: no the same request and there is no free slot
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84 * NGX_AGAIN: the same request is processing
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85 */
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86
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87 if (rc == NGX_AGAIN) {
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88
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89 if (ctx->timer && bl->waiting < bl->max_waiting) {
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90 bl->waiting++;
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91 ngx_add_timer(ctx->event, ctx->timer);
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58
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92 ctx->event->handler = ngx_event_busy_lock_handler;
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0
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93
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94 if (bl->events == NULL) {
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95 bl->events = ctx;
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96 } else {
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97 bl->last->next = ctx;
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98 }
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99 bl->last = ctx;
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100
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101 } else {
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102 rc = NGX_BUSY;
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103 }
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104 }
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105
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106 ngx_mutex_unlock(bl->mutex);
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107
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108 return rc;
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109 }
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110
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111
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112
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112 void
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113 ngx_event_busy_unlock(ngx_event_busy_lock_t *bl,
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114 ngx_event_busy_lock_ctx_t *ctx)
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0
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115 {
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116 ngx_event_t *ev;
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117 ngx_event_busy_lock_ctx_t *wakeup;
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118
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112
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119 ngx_mutex_lock(bl->mutex);
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0
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120
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121 if (bl->events) {
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122 wakeup = bl->events;
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123 bl->events = bl->events->next;
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124
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125 } else {
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126 wakeup = NULL;
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127 bl->busy--;
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128 }
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129
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130 /*
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131 * MP: all ctx's and their queue must be in shared memory,
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132 * each ctx has pid to wake up
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133 */
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134
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135 if (wakeup == NULL) {
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136 ngx_mutex_unlock(bl->mutex);
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112
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137 return;
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0
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138 }
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139
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140 if (ctx->md5) {
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141 for (wakeup = bl->events; wakeup; wakeup = wakeup->next) {
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142 if (wakeup->md5 == NULL || wakeup->slot != ctx->slot) {
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143 continue;
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144 }
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145
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146 wakeup->handler = ngx_event_busy_lock_posted_handler;
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147 wakeup->cache_updated = 1;
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148
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149 ev = wakeup->event;
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150
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112
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151 ngx_post_event(ev, &ngx_posted_events);
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0
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152 }
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153
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154 ngx_mutex_unlock(bl->mutex);
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155
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156 } else {
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157 bl->waiting--;
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158
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159 ngx_mutex_unlock(bl->mutex);
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160
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161 wakeup->handler = ngx_event_busy_lock_posted_handler;
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162 wakeup->locked = 1;
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163
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164 ev = wakeup->event;
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165
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166 if (ev->timer_set) {
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167 ngx_del_timer(ev);
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168 }
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169
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170 ngx_post_event(ev, &ngx_posted_events);
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0
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171 }
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172 }
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173
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174
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112
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175 void
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176 ngx_event_busy_lock_cancel(ngx_event_busy_lock_t *bl,
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177 ngx_event_busy_lock_ctx_t *ctx)
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0
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178 {
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179 ngx_event_busy_lock_ctx_t *c, *p;
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180
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112
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181 ngx_mutex_lock(bl->mutex);
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0
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182
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183 bl->waiting--;
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184
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185 if (ctx == bl->events) {
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186 bl->events = ctx->next;
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187
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188 } else {
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189 p = bl->events;
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190 for (c = bl->events->next; c; c = c->next) {
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191 if (c == ctx) {
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192 p->next = ctx->next;
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193 break;
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194 }
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195 p = c;
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196 }
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197 }
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198
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199 ngx_mutex_unlock(bl->mutex);
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200 }
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201
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202
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112
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203 static ngx_int_t
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340
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204 ngx_event_busy_lock_look_cacheable(ngx_event_busy_lock_t *bl,
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112
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205 ngx_event_busy_lock_ctx_t *ctx)
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0
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206 {
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207 ngx_int_t free;
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208 ngx_uint_t i, bit, cacheable, mask;
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0
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209
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210 bit = 0;
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340
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211 cacheable = 0;
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212 free = -1;
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213
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214 #if (NGX_SUPPRESS_WARN)
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215 mask = 0;
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216 #endif
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217
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218 for (i = 0; i < bl->max_busy; i++) {
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219
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220 if ((bit & 7) == 0) {
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221 mask = bl->md5_mask[i / 8];
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222 }
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223
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224 if (mask & 1) {
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225 if (ngx_memcmp(&bl->md5[i * 16], ctx->md5, 16) == 0) {
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226 ctx->waiting = 1;
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227 ctx->slot = i;
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228 return NGX_AGAIN;
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229 }
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340
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230 cacheable++;
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0
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231
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232 } else if (free == -1) {
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233 free = i;
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234 }
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235
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340
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236 if (cacheable == bl->cacheable) {
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237 if (free == -1 && cacheable < bl->max_busy) {
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0
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238 free = i + 1;
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239 }
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240
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241 break;
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242 }
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243
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244 mask >>= 1;
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245 bit++;
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246 }
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247
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248 if (free == -1) {
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249 return NGX_BUSY;
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250 }
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251
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252 #if 0
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253 if (bl->busy == bl->max_busy) {
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254 return NGX_BUSY;
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255 }
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256 #endif
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257
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258 ngx_memcpy(&bl->md5[free * 16], ctx->md5, 16);
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259 bl->md5_mask[free / 8] |= 1 << (free & 7);
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260 ctx->slot = free;
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261
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340
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262 bl->cacheable++;
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0
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263 bl->busy++;
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264
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265 return NGX_OK;
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266 }
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267
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268
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112
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269 static void
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270 ngx_event_busy_lock_handler(ngx_event_t *ev)
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0
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271 {
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112
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272 ev->handler = ngx_event_busy_lock_posted_handler;
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0
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273
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274 ngx_post_event(ev, &ngx_posted_events);
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275 }
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276
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277
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112
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278 static void
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279 ngx_event_busy_lock_posted_handler(ngx_event_t *ev)
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0
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280 {
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281 ngx_event_busy_lock_ctx_t *ctx;
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282
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283 ctx = ev->data;
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284 ctx->handler(ev);
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285 }
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