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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 #include <stdio.h>
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29 #include <sys/time.h>
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30 #include <signal.h>
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31 #include <unistd.h>
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32 #include <string.h>
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33 #include <errno.h>
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34
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35 #include "SDL_error.h"
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36 #include "SDL_timer.h"
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37 #include "SDL_timer_c.h"
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38
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39 #if defined(DISABLE_THREADS) || defined(FORK_HACK)
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40 #define USE_ITIMER
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41 #endif
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42
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43 /* The following defines should really be determined at configure time */
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44
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45 #ifdef linux
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46 /* Linux select() changes its timeout parameter upon return to contain
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47 the remaining time. Most other unixen leave it unchanged or undefined. */
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48 #define SELECT_SETS_REMAINING
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49 #elif defined(__bsdi__) || defined(__FreeBSD__) || defined(__sun__)
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50 #define USE_NANOSLEEP
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51 #endif
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52
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53
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54 /* The first ticks value of the application */
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55 static struct timeval start;
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56
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57 void SDL_StartTicks(void)
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58 {
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59 /* Set first ticks value */
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60 gettimeofday(&start, NULL);
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61 }
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62
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63 Uint32 SDL_GetTicks (void)
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64 {
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65 struct timeval now;
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66 Uint32 ticks;
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67
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68 gettimeofday(&now, NULL);
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69 ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_usec-start.tv_usec)/1000;
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70 return(ticks);
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71 }
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72
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73 void SDL_Delay (Uint32 ms)
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74 {
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75 int was_error;
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76
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77 #ifdef USE_NANOSLEEP
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78 struct timespec elapsed, tv;
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79 #else
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80 struct timeval tv;
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81 #ifndef SELECT_SETS_REMAINING
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82 Uint32 then, now, elapsed;
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83 #endif
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84 #endif
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85
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86 /* Set the timeout interval - Linux only needs to do this once */
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87 #ifdef SELECT_SETS_REMAINING
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88 tv.tv_sec = ms/1000;
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89 tv.tv_usec = (ms%1000)*1000;
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90 #elif defined(USE_NANOSLEEP)
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91 elapsed.tv_sec = ms/1000;
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92 elapsed.tv_nsec = (ms%1000)*1000000;
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93 #else
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94 then = SDL_GetTicks();
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95 #endif
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96 do {
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97 errno = 0;
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98
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99 #ifdef USE_NANOSLEEP
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100 tv.tv_sec = elapsed.tv_sec;
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101 tv.tv_nsec = elapsed.tv_nsec;
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102 was_error = nanosleep(&tv, &elapsed);
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103 #else
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104 #ifndef SELECT_SETS_REMAINING
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105 /* Calculate the time interval left (in case of interrupt) */
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106 now = SDL_GetTicks();
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107 elapsed = (now-then);
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108 then = now;
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109 if ( elapsed >= ms ) {
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110 break;
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111 }
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112 ms -= elapsed;
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113 tv.tv_sec = ms/1000;
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114 tv.tv_usec = (ms%1000)*1000;
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115 #endif
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116 was_error = select(0, NULL, NULL, NULL, &tv);
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117 #endif /* USE_NANOSLEEP */
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118 } while ( was_error && (errno == EINTR) );
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119 }
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120
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121 #ifdef USE_ITIMER
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122
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123 static void HandleAlarm(int sig)
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124 {
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125 Uint32 ms;
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126
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127 if ( SDL_alarm_callback ) {
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128 ms = (*SDL_alarm_callback)(SDL_alarm_interval);
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129 if ( ms != SDL_alarm_interval ) {
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130 SDL_SetTimer(ms, SDL_alarm_callback);
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131 }
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132 }
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133 }
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134
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135 int SDL_SYS_TimerInit(void)
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136 {
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137 struct sigaction action;
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138
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139 /* Set the alarm handler (Linux specific) */
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140 memset(&action, 0, sizeof(action));
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141 action.sa_handler = HandleAlarm;
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142 action.sa_flags = SA_RESTART;
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143 sigemptyset(&action.sa_mask);
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144 sigaction(SIGALRM, &action, NULL);
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145 return(0);
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146 }
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147
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148 void SDL_SYS_TimerQuit(void)
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149 {
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150 SDL_SetTimer(0, NULL);
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151 }
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152
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153 int SDL_SYS_StartTimer(void)
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154 {
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155 struct itimerval timer;
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156
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157 timer.it_value.tv_sec = (SDL_alarm_interval/1000);
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158 timer.it_value.tv_usec = (SDL_alarm_interval%1000)*1000;
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159 timer.it_interval.tv_sec = (SDL_alarm_interval/1000);
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160 timer.it_interval.tv_usec = (SDL_alarm_interval%1000)*1000;
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161 setitimer(ITIMER_REAL, &timer, NULL);
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162 return(0);
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163 }
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164
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165 void SDL_SYS_StopTimer(void)
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166 {
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167 struct itimerval timer;
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168
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169 memset(&timer, 0, (sizeof timer));
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170 setitimer(ITIMER_REAL, &timer, NULL);
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171 }
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172
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173 #else /* USE_ITIMER */
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174
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175 #include "SDL_thread.h"
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176
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177 /* Data to handle a single periodic alarm */
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178 static int timer_alive = 0;
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179 static SDL_Thread *timer = NULL;
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180
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181 static int RunTimer(void *unused)
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182 {
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183 while ( timer_alive ) {
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184 if ( SDL_timer_running ) {
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185 SDL_ThreadedTimerCheck();
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186 }
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187 SDL_Delay(1);
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188 }
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189 return(0);
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190 }
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191
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192 /* This is only called if the event thread is not running */
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193 int SDL_SYS_TimerInit(void)
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194 {
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195 timer_alive = 1;
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196 timer = SDL_CreateThread(RunTimer, NULL);
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197 if ( timer == NULL )
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198 return(-1);
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199 return(SDL_SetTimerThreaded(1));
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200 }
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201
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202 void SDL_SYS_TimerQuit(void)
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203 {
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204 timer_alive = 0;
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205 if ( timer ) {
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206 SDL_WaitThread(timer, NULL);
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207 timer = NULL;
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208 }
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209 }
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210
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211 int SDL_SYS_StartTimer(void)
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212 {
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213 SDL_SetError("Internal logic error: Linux uses threaded timer");
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214 return(-1);
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215 }
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216
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217 void SDL_SYS_StopTimer(void)
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218 {
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219 return;
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220 }
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221
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222 #endif /* USE_ITIMER */
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