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annotate src/timer/unix/SDL_systimer.c @ 2650:77b5f12bfe11 gsoc2008_force_feedback

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Yep, 0 is the correct value here
author Sam Lantinga <slouken@libsdl.org>
date Mon, 25 Aug 2008 09:58:51 +0000
parents c121d94672cb
children e27bdcc80744
rev   line source
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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
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62 SDL_StartTicks(void)
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63 {
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64 /* Set first ticks value */
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65 #if HAVE_CLOCK_GETTIME
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66 clock_gettime(CLOCK_MONOTONIC, &start);
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67 #else
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68 gettimeofday(&start, NULL);
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69 #endif
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70 }
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71
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72 Uint32
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73 SDL_GetTicks(void)
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74 {
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75 #if HAVE_CLOCK_GETTIME
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76 Uint32 ticks;
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77 struct timespec now;
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78 clock_gettime(CLOCK_MONOTONIC, &now);
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79 ticks =
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80 (now.tv_sec - start.tv_sec) * 1000 + (now.tv_nsec -
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81 start.tv_nsec) / 1000000;
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82 return (ticks);
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83 #else
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84 Uint32 ticks;
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85 struct timeval now;
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86 gettimeofday(&now, NULL);
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87 ticks =
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88 (now.tv_sec - start.tv_sec) * 1000 + (now.tv_usec -
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89 start.tv_usec) / 1000;
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90 return (ticks);
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91 #endif
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92 }
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93
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94 void
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95 SDL_Delay(Uint32 ms)
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96 {
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97 #if SDL_THREAD_PTH
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98 pth_time_t tv;
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99 tv.tv_sec = ms / 1000;
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100 tv.tv_usec = (ms % 1000) * 1000;
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101 pth_nap(tv);
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102 #else
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103 int was_error;
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104
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105 #if HAVE_NANOSLEEP
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106 struct timespec elapsed, tv;
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107 #else
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108 struct timeval tv;
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109 Uint32 then, now, elapsed;
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110 #endif
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111
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112 /* Set the timeout interval */
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113 #if HAVE_NANOSLEEP
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114 elapsed.tv_sec = ms / 1000;
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115 elapsed.tv_nsec = (ms % 1000) * 1000000;
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116 #else
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117 then = SDL_GetTicks();
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118 #endif
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119 do {
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120 errno = 0;
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121
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122 #if HAVE_NANOSLEEP
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123 tv.tv_sec = elapsed.tv_sec;
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124 tv.tv_nsec = elapsed.tv_nsec;
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125 was_error = nanosleep(&tv, &elapsed);
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126 #else
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127 /* Calculate the time interval left (in case of interrupt) */
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128 now = SDL_GetTicks();
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129 elapsed = (now - then);
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130 then = now;
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131 if (elapsed >= ms) {
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132 break;
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133 }
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134 ms -= elapsed;
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135 tv.tv_sec = ms / 1000;
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136 tv.tv_usec = (ms % 1000) * 1000;
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137
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138 was_error = select(0, NULL, NULL, NULL, &tv);
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139 #endif /* HAVE_NANOSLEEP */
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140 }
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141 while (was_error && (errno == EINTR));
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142 #endif /* SDL_THREAD_PTH */
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143 }
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144
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145 #ifdef USE_ITIMER
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146
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147 static void
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148 HandleAlarm(int sig)
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149 {
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150 Uint32 ms;
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151
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152 if (SDL_alarm_callback) {
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153 ms = (*SDL_alarm_callback) (SDL_alarm_interval);
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154 if (ms != SDL_alarm_interval) {
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155 SDL_SetTimer(ms, SDL_alarm_callback);
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156 }
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157 }
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158 }
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159
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160 int
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161 SDL_SYS_TimerInit(void)
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162 {
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163 struct sigaction action;
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164
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165 /* Set the alarm handler (Linux specific) */
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166 SDL_memset(&action, 0, sizeof(action));
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167 action.sa_handler = HandleAlarm;
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168 action.sa_flags = SA_RESTART;
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169 sigemptyset(&action.sa_mask);
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170 sigaction(SIGALRM, &action, NULL);
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171 return (0);
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172 }
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173
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174 void
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175 SDL_SYS_TimerQuit(void)
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176 {
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177 SDL_SetTimer(0, NULL);
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178 }
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179
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180 int
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181 SDL_SYS_StartTimer(void)
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182 {
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183 struct itimerval timer;
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184
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185 timer.it_value.tv_sec = (SDL_alarm_interval / 1000);
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186 timer.it_value.tv_usec = (SDL_alarm_interval % 1000) * 1000;
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187 timer.it_interval.tv_sec = (SDL_alarm_interval / 1000);
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188 timer.it_interval.tv_usec = (SDL_alarm_interval % 1000) * 1000;
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189 setitimer(ITIMER_REAL, &timer, NULL);
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190 return (0);
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191 }
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192
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193 void
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194 SDL_SYS_StopTimer(void)
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195 {
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196 struct itimerval timer;
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197
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198 SDL_memset(&timer, 0, (sizeof timer));
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199 setitimer(ITIMER_REAL, &timer, NULL);
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200 }
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201
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202 #else /* USE_ITIMER */
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203
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204 #include "SDL_thread.h"
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205
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206 /* Data to handle a single periodic alarm */
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207 static int timer_alive = 0;
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208 static SDL_Thread *timer = NULL;
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209
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210 static int
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211 RunTimer(void *unused)
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212 {
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213 while (timer_alive) {
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214 if (SDL_timer_running) {
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215 SDL_ThreadedTimerCheck();
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216 }
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217 SDL_Delay(1);
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218 }
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219 return (0);
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220 }
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221
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222 /* This is only called if the event thread is not running */
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223 int
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224 SDL_SYS_TimerInit(void)
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225 {
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226 timer_alive = 1;
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227 timer = SDL_CreateThread(RunTimer, NULL);
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228 if (timer == NULL)
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229 return (-1);
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230 return (SDL_SetTimerThreaded(1));
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231 }
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232
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233 void
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234 SDL_SYS_TimerQuit(void)
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235 {
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236 timer_alive = 0;
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237 if (timer) {
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238 SDL_WaitThread(timer, NULL);
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239 timer = NULL;
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240 }
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241 }
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242
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243 int
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244 SDL_SYS_StartTimer(void)
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245 {
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246 SDL_SetError("Internal logic error: Linux uses threaded timer");
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247 return (-1);
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248 }
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249
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250 void
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251 SDL_SYS_StopTimer(void)
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252 {
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253 return;
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254 }
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255
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256 #endif /* USE_ITIMER */
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257
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258 #endif /* SDL_TIMER_UNIX */
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259 /* vi: set ts=4 sw=4 expandtab: */