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annotate packages/services/gfx/mw/current/src/engine/devtimer.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
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1 /*
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2 * Copyright (c) 2000 Alex Holden <alex@linuxhacker.org>
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3 *
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4 * This file implements the device independant timer functions.
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5 *
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6 * When a part of the server wishes to set a timer, it should call the
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7 * GdAddTimer() function with the timeout parameter set to the number of
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8 * milliseconds before the timer should activate, the callback argument
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9 * set to the function which should be called when the timer expires, and
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10 * the arg argument set to the (void * type) argument which should be supplied
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11 * to the timer handler function. The GdAddTimer() returns a pointer to the
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12 * timer structure * which was created (or NULL if the creation failed for
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13 * some reason). The prototype for the callback function should look like:
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14 * void callbackfn(void *arg);
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15 *
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16 * If a part of the server wishes to destroy a timer before it has expired
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17 * (it is not necessary to do so after the timer has expired, as the timer
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18 * structure is automatically destroyed after the callback function is called),
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19 * it should call the GdDestroyTimer() function with the address of the timer
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20 * structure (which was returned by GdAddTimer()).
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21 *
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22 * If a part of the server wishes to destroy a timer but does not know the
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23 * address of it's timer structure, it can call GdFindTimer() with the
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24 * callback argument as a parameter. The argument must be unique to that
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25 * timer (the address of a structure or function is probably a good choice).
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26 * This function returns the address of the first timer found with that
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27 * argument, or NULL if no matching timer was found.
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28 *
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29 * The main select() loop needs to be called with a timeout obtained using the
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30 * GdGetNextTimeout(). GdGetNextTimeout() is called with the event loop
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31 * timeout in ms, and fills in the specified timeout structure, which should
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32 * be used as the argument to the select() call. The timeout returned by the
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33 * GdGetNextTimeout() call is decided by looking through the timer list for
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34 * the timer with the shortest amount of time remaining, and also at the
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35 * maximum delay parameter. If there are no timers on the timer list and the
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36 * timeout argument is 0, it will return FALSE, otherwise it will return TRUE.
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37 *
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38 * When the main select() loop times out, the GdTimeout() function should be
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39 * called. This will go through the timer list and call the callback functions
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40 * of all timers which have expired, then remove them from the timer list. At
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41 * the same time, you should check the value of the maximum timeout parameter
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42 * to see if it has expired (in which case you can then return to the client
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43 * with a timeout event). This function returns TRUE if the timeout specified in
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44 * the last GdGetNextTimeout() call has expired, or FALSE otherwise.
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45 *
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46 * Note that no guarantees can be made as to when exactly the timer callback
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47 * will be called as it depends on how often the GdTimeout() function is
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48 * called and how long any other timeouts in the queue before you take to
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49 * complete. Especially in the case where the client is linked into the server,
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50 * the client must call into the server on a regular basis, otherwise the
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51 * timers may run late.
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52 */
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53
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54 #include <stdio.h>
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55 #include <unistd.h>
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56 #include <stdlib.h>
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57 #include "device.h"
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58
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59 static MWTIMER *timerlist = NULL;
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60 static struct timeval mainloop_timeout;
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61 static struct timeval current_time;
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62
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63 static void calculate_timeval(struct timeval *tv, MWTIMEOUT to);
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64 static signed long time_to_expiry(struct timeval *t);
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65
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66 MWTIMER *GdAddTimer(MWTIMEOUT timeout, MWTIMERCB callback, void *arg)
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67 {
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68 MWTIMER *newtimer;
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69
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70 if(!(newtimer = malloc(sizeof(MWTIMER)))) return NULL;
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71
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72 gettimeofday(&current_time, NULL);
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73
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74 if(timerlist) timerlist->prev = newtimer;
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75
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76 calculate_timeval(&newtimer->timeout, timeout);
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77 newtimer->callback = callback;
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78 newtimer->arg = arg;
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79 newtimer->next = timerlist;
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80 newtimer->prev = NULL;
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81 newtimer->type = MWTIMER_ONESHOT;
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82 newtimer->period = timeout;
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83 timerlist = newtimer;
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84
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85 return newtimer;
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86 }
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87
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88 MWTIMER *GdAddPeriodicTimer(MWTIMEOUT timeout, MWTIMERCB callback, void *arg)
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89 {
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90 MWTIMER *newtimer;
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91
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92 if(!(newtimer = malloc(sizeof(MWTIMER)))) return NULL;
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93
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94 gettimeofday (&current_time, NULL);
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95
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96 if (timerlist) timerlist->prev = newtimer;
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97
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98 calculate_timeval (&newtimer->timeout, timeout);
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99 newtimer->callback = callback;
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100 newtimer->arg = arg;
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101 newtimer->next = timerlist;
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102 newtimer->prev = NULL;
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103 newtimer->type = MWTIMER_PERIODIC;
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104 newtimer->period = timeout;
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105 timerlist = newtimer;
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106
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107 return newtimer;
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108 }
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109
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110 void GdDestroyTimer(MWTIMER *timer)
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111 {
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112 if(timer->next) timer->next->prev = timer->prev;
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113 if(timer->prev) timer->prev->next = timer->next;
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114 if(timer == timerlist) {
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115 if(timer->next) timerlist = timer->next;
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116 else timerlist = timer->prev;
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117 }
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118 free(timer);
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119 }
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120
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121 MWTIMER *GdFindTimer(void *arg)
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122 {
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123 MWTIMER *t = timerlist;
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124
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125 while(t) {
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126 if(t->arg == arg) break;
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127 t = t->next;
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128 }
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129
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130 return t;
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131 }
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132
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133 MWBOOL GdGetNextTimeout(struct timeval *tv, MWTIMEOUT timeout)
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134 {
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135 signed long i, lowest_timeout;
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136 MWTIMER *t = timerlist;
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137
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138 if(!timeout && !timerlist) return FALSE;
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139
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140 gettimeofday(&current_time, NULL);
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141
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142 if(timeout) {
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143 calculate_timeval(&mainloop_timeout, timeout);
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144 lowest_timeout = time_to_expiry(&mainloop_timeout);
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145 } else {
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146 lowest_timeout = time_to_expiry(&t->timeout);
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147 mainloop_timeout.tv_sec = -1;
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148 t = t->next;
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149 }
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150
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151 while(t) {
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152 i = time_to_expiry(&t->timeout);
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153 if(i < lowest_timeout) lowest_timeout = i;
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154 t = t->next;
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155 }
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156
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157 if(lowest_timeout <= 0) {
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158 tv->tv_sec = 0;
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159 tv->tv_usec = 0;
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160 } else {
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161 tv->tv_sec = lowest_timeout / 1000;
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162 tv->tv_usec = (lowest_timeout % 1000) * 1000;
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163 }
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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 MWBOOL GdTimeout(void)
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169 {
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170 MWTIMER *n, *t = timerlist;
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171
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172 gettimeofday(&current_time, NULL);
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173
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174 while(t) {
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175 n = t->next;
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176 if(time_to_expiry(&t->timeout) <= 0) {
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177 t->callback(t->arg);
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178 if (t->type == MWTIMER_ONESHOT)
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179 {
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180 /* One shot timer, is finished delete it now */
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181 GdDestroyTimer(t);
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182 }
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183 else
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184 {
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185 /* Periodic timer needs to be reset */
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186 calculate_timeval (&t->timeout, t->period);
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187 }
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188 }
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189 t = n;
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190 }
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191
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192 if(mainloop_timeout.tv_sec > 0 || mainloop_timeout.tv_usec > 0)
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193 if(time_to_expiry(&mainloop_timeout) <= 0)
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194 return TRUE;
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195
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196 return FALSE;
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197 }
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198
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199 static void calculate_timeval(struct timeval *tv, MWTIMEOUT to)
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200 {
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201 tv->tv_sec = current_time.tv_sec + (to / 1000);
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202 tv->tv_usec = current_time.tv_usec + ((to % 1000) * 1000);
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203 if(tv->tv_usec > 1000000) {
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204 tv->tv_sec++;
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205 tv->tv_usec -= 1000000;
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206 }
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207 }
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208
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209 static signed long time_to_expiry(struct timeval *t)
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210 {
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211 MWTIMEOUT ret = (((t->tv_sec - current_time.tv_sec) * 1000) +
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212 ((t->tv_usec - current_time.tv_usec) / 1000));
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213
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214 return ret;
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215 }