1 | /*
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2 | clock.c
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3 |
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4 | Copyright 1995 Philip Homburg
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5 | */
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6 |
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7 | #include "inet.h"
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8 | #include "proto.h"
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9 | #include "generic/assert.h"
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10 | #include "generic/buf.h"
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11 | #include "generic/clock.h"
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12 | #include "generic/type.h"
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13 |
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14 | THIS_FILE
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15 |
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16 | PUBLIC int clck_call_expire;
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17 |
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18 | PRIVATE time_t curr_time;
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19 | PRIVATE time_t prev_time;
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20 | PRIVATE timer_t *timer_chain;
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21 | PRIVATE time_t next_timeout;
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22 | #ifdef __minix_vmd
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23 | PRIVATE int clck_tasknr= ANY;
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24 | #endif
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25 |
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26 | FORWARD _PROTOTYPE( void clck_fast_release, (timer_t *timer) );
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27 | FORWARD _PROTOTYPE( void set_timer, (void) );
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28 |
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29 | PUBLIC void clck_init()
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30 | {
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31 | int r;
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32 |
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33 | clck_call_expire= 0;
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34 | curr_time= 0;
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35 | prev_time= 0;
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36 | next_timeout= 0;
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37 | timer_chain= 0;
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38 |
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39 | #ifdef __minix_vmd
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40 | r= sys_findproc(CLOCK_NAME, &clck_tasknr, 0);
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41 | if (r != OK)
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42 | ip_panic(( "unable to find clock task: %d\n", r ));
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43 | #endif
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44 | }
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45 |
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46 | PUBLIC time_t get_time()
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47 | {
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48 | if (!curr_time)
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49 | {
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50 | #ifdef __minix_vmd
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51 | static message mess;
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52 |
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53 | mess.m_type= GET_UPTIME;
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54 | if (sendrec (clck_tasknr, &mess) < 0)
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55 | ip_panic(("unable to sendrec"));
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56 | if (mess.m_type != OK)
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57 | ip_panic(("can't read clock"));
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58 | curr_time= mess.NEW_TIME;
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59 | #else /* Minix 3 */
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60 | int s;
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61 | if ((s=getuptime(&curr_time)) != OK)
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62 | ip_panic(("can't read clock"));
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63 | #endif
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64 | assert(curr_time >= prev_time);
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65 | }
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66 | return curr_time;
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67 | }
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68 |
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69 | PUBLIC void set_time (tim)
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70 | time_t tim;
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71 | {
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72 | if (!curr_time && tim >= prev_time)
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73 | {
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74 | /* Some code assumes that no time elapses while it is
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75 | * running.
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76 | */
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77 | curr_time= tim;
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78 | }
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79 | else if (!curr_time)
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80 | {
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81 | DBLOCK(0x20, printf("set_time: new time %ld < prev_time %ld\n",
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82 | tim, prev_time));
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83 | }
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84 | }
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85 |
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86 | PUBLIC void reset_time()
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87 | {
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88 | prev_time= curr_time;
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89 | curr_time= 0;
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90 | }
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91 |
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92 | PUBLIC void clck_timer(timer, timeout, func, fd)
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93 | timer_t *timer;
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94 | time_t timeout;
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95 | timer_func_t func;
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96 | int fd;
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97 | {
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98 | timer_t *timer_index;
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99 |
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100 | if (timer->tim_active)
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101 | clck_fast_release(timer);
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102 | assert(!timer->tim_active);
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103 |
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104 | timer->tim_next= 0;
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105 | timer->tim_func= func;
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106 | timer->tim_ref= fd;
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107 | timer->tim_time= timeout;
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108 | timer->tim_active= 1;
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109 |
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110 | if (!timer_chain)
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111 | timer_chain= timer;
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112 | else if (timeout < timer_chain->tim_time)
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113 | {
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114 | timer->tim_next= timer_chain;
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115 | timer_chain= timer;
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116 | }
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117 | else
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118 | {
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119 | timer_index= timer_chain;
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120 | while (timer_index->tim_next &&
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121 | timer_index->tim_next->tim_time < timeout)
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122 | timer_index= timer_index->tim_next;
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123 | timer->tim_next= timer_index->tim_next;
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124 | timer_index->tim_next= timer;
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125 | }
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126 | if (next_timeout == 0 || timer_chain->tim_time < next_timeout)
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127 | set_timer();
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128 | }
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129 |
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130 | PUBLIC void clck_tick (mess)
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131 | message *mess;
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132 | {
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133 | next_timeout= 0;
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134 | set_timer();
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135 | }
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136 |
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137 | PRIVATE void clck_fast_release (timer)
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138 | timer_t *timer;
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139 | {
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140 | timer_t *timer_index;
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141 |
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142 | if (!timer->tim_active)
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143 | return;
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144 |
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145 | if (timer == timer_chain)
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146 | timer_chain= timer_chain->tim_next;
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147 | else
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148 | {
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149 | timer_index= timer_chain;
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150 | while (timer_index && timer_index->tim_next != timer)
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151 | timer_index= timer_index->tim_next;
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152 | assert(timer_index);
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153 | timer_index->tim_next= timer->tim_next;
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154 | }
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155 | timer->tim_active= 0;
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156 | }
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157 |
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158 | PRIVATE void set_timer()
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159 | {
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160 | time_t new_time;
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161 | time_t curr_time;
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162 |
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163 | if (!timer_chain)
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164 | return;
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165 |
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166 | curr_time= get_time();
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167 | new_time= timer_chain->tim_time;
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168 | if (new_time <= curr_time)
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169 | {
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170 | clck_call_expire= 1;
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171 | return;
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172 | }
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173 |
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174 | if (next_timeout == 0 || new_time < next_timeout)
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175 | {
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176 | #ifdef __minix_vmd
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177 | static message mess;
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178 |
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179 | next_timeout= new_time;
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180 |
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181 | new_time -= curr_time;
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182 |
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183 | mess.m_type= SET_SYNC_AL;
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184 | mess.CLOCK_PROC_NR= this_proc;
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185 | mess.DELTA_TICKS= new_time;
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186 | if (sendrec (clck_tasknr, &mess) < 0)
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187 | ip_panic(("unable to sendrec"));
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188 | if (mess.m_type != OK)
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189 | ip_panic(("can't set timer"));
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190 | #else /* Minix 3 */
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191 | next_timeout= new_time;
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192 | new_time -= curr_time;
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193 |
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194 | if (sys_setalarm(new_time, 0) != OK)
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195 | ip_panic(("can't set timer"));
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196 | #endif
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197 | }
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198 | }
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199 |
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200 | PUBLIC void clck_untimer (timer)
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201 | timer_t *timer;
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202 | {
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203 | clck_fast_release (timer);
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204 | set_timer();
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205 | }
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206 |
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207 | PUBLIC void clck_expire_timers()
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208 | {
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209 | time_t curr_time;
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210 | timer_t *timer_index;
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211 |
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212 | clck_call_expire= 0;
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213 |
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214 | if (timer_chain == NULL)
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215 | return;
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216 |
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217 | curr_time= get_time();
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218 | while (timer_chain && timer_chain->tim_time<=curr_time)
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219 | {
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220 | assert(timer_chain->tim_active);
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221 | timer_chain->tim_active= 0;
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222 | timer_index= timer_chain;
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223 | timer_chain= timer_chain->tim_next;
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224 | (*timer_index->tim_func)(timer_index->tim_ref, timer_index);
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225 | }
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226 | set_timer();
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227 | }
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228 |
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229 | /*
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230 | * $PchId: clock.c,v 1.10 2005/06/28 14:23:40 philip Exp $
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231 | */
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