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annotate src/timer/unix/SDL_systimer.c @ 1635:92947e3a18db

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Make sure code is only compiled if the appropriate subsystem is enabled
author Sam Lantinga <slouken@libsdl.org>
date Fri, 14 Apr 2006 04:46:47 +0000
parents 5a6893ebc15a
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
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24 #ifdef SDL_TIMER_UNIX
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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
92947e3a18db Make sure code is only compiled if the appropriate subsystem is enabled
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239
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240 #endif /* SDL_TIMER_UNIX */