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annotate src/timer/unix/SDL_systimer.c @ 1402:d910939febfa

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Use consistent identifiers for the various platforms we support. Make sure every source file includes SDL_config.h, so the proper system headers are chosen.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 21 Feb 2006 08:46:50 +0000
parents 1736c5e2173f
children 5a6893ebc15a
rev   line source
1361
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 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 Lesser 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 Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
1402
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22 #include "SDL_config.h"
1361
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23
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24 #include <stdio.h>
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25 #include <sys/time.h>
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26 #include <signal.h>
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27 #include <unistd.h>
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28 #include <string.h>
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29 #include <errno.h>
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30
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31 #include "SDL_timer.h"
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32 #include "../SDL_timer_c.h"
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33
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34 /* The clock_gettime provides monotonous time, so we should use it if
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35 it's available. The clock_gettime function is behind ifdef
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36 for __USE_POSIX199309
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37 Tommi Kyntola (tommi.kyntola@ray.fi) 27/09/2005
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38 */
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39 #if HAVE_CLOCK_GETTIME
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40 #include <time.h>
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41 #endif
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42
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43 #if SDL_THREAD_PTH
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44 #include <pth.h>
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45 #endif
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46
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47 #if SDL_THREADS_DISABLED
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48 #define USE_ITIMER
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49 #endif
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50
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51 /* The first ticks value of the application */
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52 #ifdef HAVE_CLOCK_GETTIME
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53 static struct timespec start;
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54 #else
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55 static struct timeval start;
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56 #endif /* HAVE_CLOCK_GETTIME */
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57
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58
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59 void SDL_StartTicks(void)
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60 {
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61 /* Set first ticks value */
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62 #if HAVE_CLOCK_GETTIME
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63 clock_gettime(CLOCK_MONOTONIC,&start);
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64 #else
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65 gettimeofday(&start, NULL);
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66 #endif
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67 }
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68
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69 Uint32 SDL_GetTicks (void)
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70 {
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71 #if HAVE_CLOCK_GETTIME
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72 Uint32 ticks;
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73 struct timespec now;
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74 clock_gettime(CLOCK_MONOTONIC,&now);
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75 ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_nsec-start.tv_nsec)/1000000;
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76 return(ticks);
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77 #else
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78 Uint32 ticks;
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79 struct timeval now;
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80 gettimeofday(&now, NULL);
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81 ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_usec-start.tv_usec)/1000;
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82 return(ticks);
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83 #endif
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84 }
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85
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86 void SDL_Delay (Uint32 ms)
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87 {
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88 #if SDL_THREAD_PTH
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89 pth_time_t tv;
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90 tv.tv_sec = ms/1000;
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91 tv.tv_usec = (ms%1000)*1000;
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92 pth_nap(tv);
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93 #else
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94 int was_error;
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95
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96 #if HAVE_NANOSLEEP
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97 struct timespec elapsed, tv;
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98 #else
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99 struct timeval tv;
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100 Uint32 then, now, elapsed;
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101 #endif
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102
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103 /* Set the timeout interval */
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104 #if HAVE_NANOSLEEP
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105 elapsed.tv_sec = ms/1000;
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106 elapsed.tv_nsec = (ms%1000)*1000000;
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107 #else
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108 then = SDL_GetTicks();
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109 #endif
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110 do {
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111 errno = 0;
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112
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113 #if HAVE_NANOSLEEP
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114 tv.tv_sec = elapsed.tv_sec;
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115 tv.tv_nsec = elapsed.tv_nsec;
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116 was_error = nanosleep(&tv, &elapsed);
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117 #else
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118 /* Calculate the time interval left (in case of interrupt) */
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119 now = SDL_GetTicks();
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120 elapsed = (now-then);
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121 then = now;
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122 if ( elapsed >= ms ) {
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123 break;
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124 }
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125 ms -= elapsed;
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126 tv.tv_sec = ms/1000;
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127 tv.tv_usec = (ms%1000)*1000;
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128
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129 was_error = select(0, NULL, NULL, NULL, &tv);
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130 #endif /* HAVE_NANOSLEEP */
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131 } while ( was_error && (errno == EINTR) );
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132 #endif /* SDL_THREAD_PTH */
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133 }
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134
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135 #ifdef USE_ITIMER
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136
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137 static void HandleAlarm(int sig)
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138 {
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139 Uint32 ms;
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140
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141 if ( SDL_alarm_callback ) {
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142 ms = (*SDL_alarm_callback)(SDL_alarm_interval);
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143 if ( ms != SDL_alarm_interval ) {
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144 SDL_SetTimer(ms, SDL_alarm_callback);
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145 }
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146 }
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147 }
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148
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149 int SDL_SYS_TimerInit(void)
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150 {
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151 struct sigaction action;
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152
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153 /* Set the alarm handler (Linux specific) */
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154 SDL_memset(&action, 0, sizeof(action));
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155 action.sa_handler = HandleAlarm;
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156 action.sa_flags = SA_RESTART;
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157 sigemptyset(&action.sa_mask);
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158 sigaction(SIGALRM, &action, NULL);
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159 return(0);
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160 }
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161
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162 void SDL_SYS_TimerQuit(void)
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163 {
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164 SDL_SetTimer(0, NULL);
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165 }
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166
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167 int SDL_SYS_StartTimer(void)
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168 {
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169 struct itimerval timer;
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170
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171 timer.it_value.tv_sec = (SDL_alarm_interval/1000);
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172 timer.it_value.tv_usec = (SDL_alarm_interval%1000)*1000;
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173 timer.it_interval.tv_sec = (SDL_alarm_interval/1000);
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174 timer.it_interval.tv_usec = (SDL_alarm_interval%1000)*1000;
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175 setitimer(ITIMER_REAL, &timer, NULL);
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176 return(0);
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177 }
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178
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179 void SDL_SYS_StopTimer(void)
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180 {
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181 struct itimerval timer;
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182
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183 SDL_memset(&timer, 0, (sizeof timer));
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184 setitimer(ITIMER_REAL, &timer, NULL);
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185 }
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186
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187 #else /* USE_ITIMER */
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188
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189 #include "SDL_thread.h"
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190
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191 /* Data to handle a single periodic alarm */
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192 static int timer_alive = 0;
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193 static SDL_Thread *timer = NULL;
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194
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195 static int RunTimer(void *unused)
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196 {
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197 while ( timer_alive ) {
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198 if ( SDL_timer_running ) {
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199 SDL_ThreadedTimerCheck();
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200 }
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201 SDL_Delay(1);
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202 }
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203 return(0);
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204 }
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205
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206 /* This is only called if the event thread is not running */
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207 int SDL_SYS_TimerInit(void)
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208 {
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209 timer_alive = 1;
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210 timer = SDL_CreateThread(RunTimer, NULL);
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211 if ( timer == NULL )
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212 return(-1);
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213 return(SDL_SetTimerThreaded(1));
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214 }
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215
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216 void SDL_SYS_TimerQuit(void)
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217 {
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218 timer_alive = 0;
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219 if ( timer ) {
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220 SDL_WaitThread(timer, NULL);
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221 timer = NULL;
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222 }
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223 }
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224
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225 int SDL_SYS_StartTimer(void)
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226 {
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227 SDL_SetError("Internal logic error: Linux uses threaded timer");
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228 return(-1);
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229 }
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230
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231 void SDL_SYS_StopTimer(void)
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232 {
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233 return;
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234 }
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235
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236 #endif /* USE_ITIMER */