1 | #include "owl.h" |
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2 | |
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3 | static GMainLoop *loop = NULL; |
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4 | static int dispatch_active = 0; |
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5 | |
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6 | static GSource *owl_timer_source; |
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7 | static GSource *owl_io_dispatch_source; |
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8 | |
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9 | static int _owl_select_timer_cmp(const owl_timer *t1, const owl_timer *t2); |
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10 | static void owl_select_io_dispatch_gc(void); |
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11 | |
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12 | static gboolean owl_timer_prepare(GSource *source, int *timeout) { |
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13 | GList **timers = owl_global_get_timerlist(&g); |
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14 | GTimeVal now; |
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15 | |
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16 | /* TODO: In the far /far/ future, g_source_get_time is what the cool |
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17 | * kids use to get system monotonic time. */ |
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18 | g_source_get_current_time(source, &now); |
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19 | |
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20 | /* FIXME: bother with millisecond accuracy now that we can? */ |
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21 | if (*timers) { |
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22 | owl_timer *t = (*timers)->data; |
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23 | *timeout = t->time - now.tv_sec; |
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24 | if (*timeout <= 0) { |
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25 | *timeout = 0; |
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26 | return TRUE; |
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27 | } |
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28 | if (*timeout > 60 * 1000) |
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29 | *timeout = 60 * 1000; |
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30 | } else { |
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31 | *timeout = 60 * 1000; |
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32 | } |
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33 | return FALSE; |
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34 | } |
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35 | |
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36 | static gboolean owl_timer_check(GSource *source) { |
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37 | GList **timers = owl_global_get_timerlist(&g); |
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38 | GTimeVal now; |
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39 | |
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40 | /* TODO: In the far /far/ future, g_source_get_time is what the cool |
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41 | * kids use to get system monotonic time. */ |
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42 | g_source_get_current_time(source, &now); |
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43 | |
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44 | /* FIXME: bother with millisecond accuracy now that we can? */ |
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45 | if (*timers) { |
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46 | owl_timer *t = (*timers)->data; |
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47 | return t->time >= now.tv_sec; |
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48 | } |
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49 | return FALSE; |
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50 | } |
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51 | |
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52 | |
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53 | static gboolean owl_timer_dispatch(GSource *source, GSourceFunc callback, gpointer user_data) { |
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54 | GList **timers = owl_global_get_timerlist(&g); |
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55 | GTimeVal now; |
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56 | |
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57 | /* TODO: In the far /far/ future, g_source_get_time is what the cool |
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58 | * kids use to get system monotonic time. */ |
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59 | g_source_get_current_time(source, &now); |
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60 | |
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61 | /* FIXME: bother with millisecond accuracy now that we can? */ |
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62 | while(*timers) { |
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63 | owl_timer *t = (*timers)->data; |
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64 | int remove = 0; |
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65 | |
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66 | if(t->time > now.tv_sec) |
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67 | break; |
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68 | |
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69 | /* Reschedule if appropriate */ |
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70 | if(t->interval > 0) { |
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71 | t->time = now.tv_sec + t->interval; |
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72 | *timers = g_list_remove(*timers, t); |
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73 | *timers = g_list_insert_sorted(*timers, t, |
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74 | (GCompareFunc)_owl_select_timer_cmp); |
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75 | } else { |
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76 | remove = 1; |
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77 | } |
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78 | |
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79 | /* Do the callback */ |
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80 | t->callback(t, t->data); |
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81 | if(remove) { |
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82 | owl_select_remove_timer(t); |
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83 | } |
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84 | } |
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85 | return TRUE; |
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86 | } |
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87 | |
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88 | static GSourceFuncs owl_timer_funcs = { |
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89 | owl_timer_prepare, |
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90 | owl_timer_check, |
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91 | owl_timer_dispatch, |
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92 | NULL |
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93 | }; |
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94 | |
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95 | static int _owl_select_timer_cmp(const owl_timer *t1, const owl_timer *t2) { |
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96 | return t1->time - t2->time; |
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97 | } |
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98 | |
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99 | owl_timer *owl_select_add_timer(const char* name, int after, int interval, void (*cb)(owl_timer *, void *), void (*destroy)(owl_timer*), void *data) |
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100 | { |
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101 | owl_timer *t = g_new(owl_timer, 1); |
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102 | GList **timers = owl_global_get_timerlist(&g); |
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103 | |
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104 | t->time = time(NULL) + after; |
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105 | t->interval = interval; |
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106 | t->callback = cb; |
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107 | t->destroy = destroy; |
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108 | t->data = data; |
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109 | t->name = name ? g_strdup(name) : NULL; |
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110 | |
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111 | *timers = g_list_insert_sorted(*timers, t, |
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112 | (GCompareFunc)_owl_select_timer_cmp); |
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113 | return t; |
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114 | } |
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115 | |
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116 | void owl_select_remove_timer(owl_timer *t) |
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117 | { |
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118 | GList **timers = owl_global_get_timerlist(&g); |
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119 | if (t && g_list_find(*timers, t)) { |
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120 | *timers = g_list_remove(*timers, t); |
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121 | if(t->destroy) { |
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122 | t->destroy(t); |
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123 | } |
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124 | g_free(t->name); |
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125 | g_free(t); |
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126 | } |
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127 | } |
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128 | |
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129 | |
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130 | static gboolean owl_io_dispatch_prepare(GSource *source, int *timeout) { |
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131 | *timeout = -1; |
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132 | return FALSE; |
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133 | } |
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134 | |
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135 | static gboolean owl_io_dispatch_check(GSource *source) { |
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136 | int i, len; |
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137 | const owl_list *dl; |
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138 | |
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139 | dl = owl_global_get_io_dispatch_list(&g); |
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140 | len = owl_list_get_size(dl); |
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141 | for(i = 0; i < len; i++) { |
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142 | const owl_io_dispatch *d = owl_list_get_element(dl, i); |
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143 | if (d->pollfd.revents & d->pollfd.events) |
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144 | return TRUE; |
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145 | } |
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146 | return FALSE; |
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147 | } |
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148 | |
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149 | static gboolean owl_io_dispatch_dispatch(GSource *source, GSourceFunc callback, gpointer user_data) { |
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150 | int i, len; |
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151 | const owl_list *dl; |
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152 | |
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153 | dispatch_active = 1; |
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154 | dl = owl_global_get_io_dispatch_list(&g); |
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155 | len = owl_list_get_size(dl); |
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156 | for (i = 0; i < len; i++) { |
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157 | owl_io_dispatch *d = owl_list_get_element(dl, i); |
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158 | if ((d->pollfd.revents & d->pollfd.events) && d->callback != NULL) { |
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159 | d->callback(d, d->data); |
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160 | } |
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161 | } |
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162 | dispatch_active = 0; |
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163 | owl_select_io_dispatch_gc(); |
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164 | |
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165 | return TRUE; |
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166 | } |
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167 | |
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168 | static GSourceFuncs owl_io_dispatch_funcs = { |
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169 | owl_io_dispatch_prepare, |
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170 | owl_io_dispatch_check, |
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171 | owl_io_dispatch_dispatch, |
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172 | NULL |
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173 | }; |
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174 | |
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175 | static const owl_io_dispatch *owl_select_find_io_dispatch_by_fd(const int fd) |
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176 | { |
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177 | int i, len; |
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178 | const owl_list *dl; |
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179 | owl_io_dispatch *d; |
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180 | dl = owl_global_get_io_dispatch_list(&g); |
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181 | len = owl_list_get_size(dl); |
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182 | for(i = 0; i < len; i++) { |
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183 | d = owl_list_get_element(dl, i); |
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184 | if (d->fd == fd) return d; |
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185 | } |
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186 | return NULL; |
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187 | } |
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188 | |
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189 | static int owl_select_find_io_dispatch(const owl_io_dispatch *in) |
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190 | { |
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191 | int i, len; |
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192 | const owl_list *dl; |
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193 | |
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194 | if (in != NULL) { |
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195 | dl = owl_global_get_io_dispatch_list(&g); |
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196 | len = owl_list_get_size(dl); |
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197 | for(i = 0; i < len; i++) { |
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198 | const owl_io_dispatch *d = owl_list_get_element(dl, i); |
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199 | if (d == in) return i; |
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200 | } |
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201 | } |
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202 | return -1; |
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203 | } |
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204 | |
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205 | void owl_select_remove_io_dispatch(const owl_io_dispatch *in) |
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206 | { |
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207 | int elt; |
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208 | if (in != NULL) { |
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209 | elt = owl_select_find_io_dispatch(in); |
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210 | if (elt != -1) { |
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211 | owl_list *dl = owl_global_get_io_dispatch_list(&g); |
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212 | owl_io_dispatch *d = owl_list_get_element(dl, elt); |
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213 | if (dispatch_active) |
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214 | d->needs_gc = 1; |
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215 | else { |
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216 | owl_list_remove_element(dl, elt); |
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217 | if (d->destroy) |
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218 | d->destroy(d); |
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219 | g_source_remove_poll(owl_io_dispatch_source, &d->pollfd); |
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220 | g_free(d); |
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221 | } |
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222 | } |
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223 | } |
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224 | } |
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225 | |
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226 | static void owl_select_io_dispatch_gc(void) |
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227 | { |
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228 | int i; |
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229 | owl_list *dl; |
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230 | |
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231 | dl = owl_global_get_io_dispatch_list(&g); |
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232 | /* |
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233 | * Count down so we aren't set off by removing items from the list |
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234 | * during the iteration. |
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235 | */ |
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236 | for(i = owl_list_get_size(dl) - 1; i >= 0; i--) { |
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237 | owl_io_dispatch *d = owl_list_get_element(dl, i); |
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238 | if(d->needs_gc) { |
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239 | owl_select_remove_io_dispatch(d); |
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240 | } |
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241 | } |
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242 | } |
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243 | |
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244 | /* Each FD may have at most one dispatcher. |
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245 | * If a new dispatch is added for an FD, the old one is removed. |
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246 | * mode determines what types of events are watched for, and may be any combination of: |
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247 | * OWL_IO_READ, OWL_IO_WRITE, OWL_IO_EXCEPT |
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248 | */ |
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249 | const owl_io_dispatch *owl_select_add_io_dispatch(int fd, int mode, void (*cb)(const owl_io_dispatch *, void *), void (*destroy)(const owl_io_dispatch *), void *data) |
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250 | { |
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251 | owl_io_dispatch *d = g_new(owl_io_dispatch, 1); |
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252 | owl_list *dl = owl_global_get_io_dispatch_list(&g); |
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253 | |
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254 | d->fd = fd; |
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255 | d->needs_gc = 0; |
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256 | d->mode = mode; |
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257 | d->callback = cb; |
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258 | d->destroy = destroy; |
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259 | d->data = data; |
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260 | |
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261 | /* TODO: Allow changing fd and mode in the middle? Probably don't care... */ |
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262 | d->pollfd.fd = fd; |
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263 | d->pollfd.events = 0; |
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264 | if (d->mode & OWL_IO_READ) |
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265 | d->pollfd.events |= G_IO_IN | G_IO_HUP | G_IO_ERR; |
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266 | if (d->mode & OWL_IO_WRITE) |
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267 | d->pollfd.events |= G_IO_OUT | G_IO_ERR; |
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268 | if (d->mode & OWL_IO_EXCEPT) |
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269 | d->pollfd.events |= G_IO_PRI | G_IO_ERR; |
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270 | g_source_add_poll(owl_io_dispatch_source, &d->pollfd); |
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271 | |
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272 | |
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273 | owl_select_remove_io_dispatch(owl_select_find_io_dispatch_by_fd(fd)); |
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274 | owl_list_append_element(dl, d); |
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275 | |
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276 | return d; |
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277 | } |
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278 | |
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279 | int owl_select_add_perl_io_dispatch(int fd, int mode, SV *cb) |
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280 | { |
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281 | const owl_io_dispatch *d = owl_select_find_io_dispatch_by_fd(fd); |
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282 | if (d != NULL && d->callback != owl_perlconfig_io_dispatch) { |
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283 | /* Don't mess with non-perl dispatch functions from here. */ |
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284 | return 1; |
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285 | } |
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286 | owl_select_add_io_dispatch(fd, mode, owl_perlconfig_io_dispatch, owl_perlconfig_io_dispatch_destroy, cb); |
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287 | return 0; |
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288 | } |
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289 | |
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290 | int owl_select_remove_perl_io_dispatch(int fd) |
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291 | { |
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292 | const owl_io_dispatch *d = owl_select_find_io_dispatch_by_fd(fd); |
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293 | if (d != NULL && d->callback == owl_perlconfig_io_dispatch) { |
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294 | /* Only remove perl io dispatchers from here. */ |
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295 | owl_select_remove_io_dispatch(d); |
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296 | return 0; |
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297 | } |
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298 | return 1; |
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299 | } |
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300 | |
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301 | void owl_select_init(void) |
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302 | { |
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303 | owl_timer_source = g_source_new(&owl_timer_funcs, sizeof(GSource)); |
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304 | g_source_attach(owl_timer_source, NULL); |
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305 | |
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306 | owl_io_dispatch_source = g_source_new(&owl_io_dispatch_funcs, sizeof(GSource)); |
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307 | g_source_attach(owl_io_dispatch_source, NULL); |
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308 | } |
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309 | |
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310 | void owl_select_run_loop(void) |
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311 | { |
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312 | loop = g_main_loop_new(NULL, FALSE); |
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313 | g_main_loop_run(loop); |
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314 | } |
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315 | |
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316 | void owl_select_quit_loop(void) |
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317 | { |
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318 | if (loop) { |
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319 | g_main_loop_quit(loop); |
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320 | loop = NULL; |
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321 | } |
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322 | } |
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