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annotate src/timer/unix/SDL_systimer.c @ 1621:f12379c41042

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Fixes bug #195: The proper name of Apple's operating system is "Mac OS X" not "MacOS X", as can bee seen in many places, for example http://www.apple.com/macosx/). This contrasts the naming of the old operating system, which was called "MacOS" and today is often refered to as "MacOS Classic". The attached patches fixes the misuse of the name "MacOS X" in both the SDL12 and sdlweb CVS modules.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 13 Apr 2006 13:08:26 +0000
parents 5a6893ebc15a
children 92947e3a18db
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 #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_NANOSLEEP || 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 */