Mercurial > sdl-ios-xcode

annotate src/timer/unix/SDL_systimer.c @ 3958:85b6fb6a5e3c SDL-1.2

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Actually, this is a better fix...clear the error state once if everything we need loaded; it's more efficient, and works even if the last unnecessary xrandr symbol failed to load. Otherwise, leave the original loadso error, so the end user can find out what symbol failed.
author Ryan C. Gordon <icculus@icculus.org>
date Wed, 13 Jun 2007 08:00:10 +0000
parents 92947e3a18db
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
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 */
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22 #include "SDL_config.h"
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23
1635
92947e3a18db Make sure code is only compiled if the appropriate subsystem is enabled
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24 #ifdef SDL_TIMER_UNIX
92947e3a18db Make sure code is only compiled if the appropriate subsystem is enabled
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25
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26 #include <stdio.h>
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27 #include <sys/time.h>
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28 #include <signal.h>
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29 #include <unistd.h>
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30 #include <string.h>
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31 #include <errno.h>
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32
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33 #include "SDL_timer.h"
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34 #include "../SDL_timer_c.h"
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35
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36 /* The clock_gettime provides monotonous time, so we should use it if
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37 it's available. The clock_gettime function is behind ifdef
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38 for __USE_POSIX199309
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39 Tommi Kyntola (tommi.kyntola@ray.fi) 27/09/2005
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40 */
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41 #if HAVE_NANOSLEEP || HAVE_CLOCK_GETTIME
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42 #include <time.h>
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43 #endif
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44
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45 #if SDL_THREAD_PTH
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46 #include <pth.h>
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47 #endif
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48
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49 #if SDL_THREADS_DISABLED
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50 #define USE_ITIMER
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51 #endif
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52
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53 /* The first ticks value of the application */
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54 #ifdef HAVE_CLOCK_GETTIME
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55 static struct timespec start;
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56 #else
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57 static struct timeval start;
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58 #endif /* HAVE_CLOCK_GETTIME */
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59
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60
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61 void SDL_StartTicks(void)
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62 {
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63 /* Set first ticks value */
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64 #if HAVE_CLOCK_GETTIME
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65 clock_gettime(CLOCK_MONOTONIC,&start);
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66 #else
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67 gettimeofday(&start, NULL);
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68 #endif
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69 }
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70
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71 Uint32 SDL_GetTicks (void)
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72 {
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73 #if HAVE_CLOCK_GETTIME
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74 Uint32 ticks;
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75 struct timespec now;
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76 clock_gettime(CLOCK_MONOTONIC,&now);
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77 ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_nsec-start.tv_nsec)/1000000;
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78 return(ticks);
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79 #else
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80 Uint32 ticks;
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81 struct timeval now;
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82 gettimeofday(&now, NULL);
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83 ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_usec-start.tv_usec)/1000;
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84 return(ticks);
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85 #endif
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86 }
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87
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88 void SDL_Delay (Uint32 ms)
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89 {
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90 #if SDL_THREAD_PTH
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91 pth_time_t tv;
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92 tv.tv_sec = ms/1000;
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93 tv.tv_usec = (ms%1000)*1000;
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94 pth_nap(tv);
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95 #else
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96 int was_error;
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97
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98 #if HAVE_NANOSLEEP
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99 struct timespec elapsed, tv;
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100 #else
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101 struct timeval tv;
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102 Uint32 then, now, elapsed;
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103 #endif
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104
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105 /* Set the timeout interval */
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106 #if HAVE_NANOSLEEP
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107 elapsed.tv_sec = ms/1000;
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108 elapsed.tv_nsec = (ms%1000)*1000000;
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109 #else
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110 then = SDL_GetTicks();
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111 #endif
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112 do {
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113 errno = 0;
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114
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115 #if HAVE_NANOSLEEP
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116 tv.tv_sec = elapsed.tv_sec;
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117 tv.tv_nsec = elapsed.tv_nsec;
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118 was_error = nanosleep(&tv, &elapsed);
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119 #else
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120 /* Calculate the time interval left (in case of interrupt) */
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121 now = SDL_GetTicks();
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122 elapsed = (now-then);
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123 then = now;
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124 if ( elapsed >= ms ) {
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125 break;
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126 }
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127 ms -= elapsed;
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128 tv.tv_sec = ms/1000;
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129 tv.tv_usec = (ms%1000)*1000;
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130
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131 was_error = select(0, NULL, NULL, NULL, &tv);
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132 #endif /* HAVE_NANOSLEEP */
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133 } while ( was_error && (errno == EINTR) );
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134 #endif /* SDL_THREAD_PTH */
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135 }
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136
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137 #ifdef USE_ITIMER
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138
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139 static void HandleAlarm(int sig)
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140 {
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141 Uint32 ms;
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142
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143 if ( SDL_alarm_callback ) {
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144 ms = (*SDL_alarm_callback)(SDL_alarm_interval);
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145 if ( ms != SDL_alarm_interval ) {
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146 SDL_SetTimer(ms, SDL_alarm_callback);
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147 }
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148 }
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149 }
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150
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151 int SDL_SYS_TimerInit(void)
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152 {
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153 struct sigaction action;
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154
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155 /* Set the alarm handler (Linux specific) */
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156 SDL_memset(&action, 0, sizeof(action));
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157 action.sa_handler = HandleAlarm;
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158 action.sa_flags = SA_RESTART;
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159 sigemptyset(&action.sa_mask);
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160 sigaction(SIGALRM, &action, NULL);
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161 return(0);
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162 }
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163
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164 void SDL_SYS_TimerQuit(void)
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165 {
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166 SDL_SetTimer(0, NULL);
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167 }
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168
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169 int SDL_SYS_StartTimer(void)
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170 {
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171 struct itimerval timer;
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172
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173 timer.it_value.tv_sec = (SDL_alarm_interval/1000);
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174 timer.it_value.tv_usec = (SDL_alarm_interval%1000)*1000;
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175 timer.it_interval.tv_sec = (SDL_alarm_interval/1000);
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176 timer.it_interval.tv_usec = (SDL_alarm_interval%1000)*1000;
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177 setitimer(ITIMER_REAL, &timer, NULL);
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178 return(0);
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179 }
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180
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181 void SDL_SYS_StopTimer(void)
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182 {
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183 struct itimerval timer;
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184
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185 SDL_memset(&timer, 0, (sizeof timer));
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186 setitimer(ITIMER_REAL, &timer, NULL);
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187 }
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188
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189 #else /* USE_ITIMER */
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190
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191 #include "SDL_thread.h"
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192
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193 /* Data to handle a single periodic alarm */
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194 static int timer_alive = 0;
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195 static SDL_Thread *timer = NULL;
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196
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197 static int RunTimer(void *unused)
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198 {
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199 while ( timer_alive ) {
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200 if ( SDL_timer_running ) {
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201 SDL_ThreadedTimerCheck();
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202 }
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203 SDL_Delay(1);
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204 }
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205 return(0);
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206 }
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207
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208 /* This is only called if the event thread is not running */
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209 int SDL_SYS_TimerInit(void)
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210 {
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211 timer_alive = 1;
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212 timer = SDL_CreateThread(RunTimer, NULL);
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213 if ( timer == NULL )
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214 return(-1);
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215 return(SDL_SetTimerThreaded(1));
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216 }
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217
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218 void SDL_SYS_TimerQuit(void)
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219 {
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220 timer_alive = 0;
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221 if ( timer ) {
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222 SDL_WaitThread(timer, NULL);
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223 timer = NULL;
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224 }
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225 }
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226
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227 int SDL_SYS_StartTimer(void)
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228 {
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229 SDL_SetError("Internal logic error: Linux uses threaded timer");
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230 return(-1);
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231 }
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232
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233 void SDL_SYS_StopTimer(void)
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234 {
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235 return;
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236 }
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237
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238 #endif /* USE_ITIMER */
1635
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239
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240 #endif /* SDL_TIMER_UNIX */