Mercurial > sdl-ios-xcode

annotate src/timer/unix/SDL_systimer.c @ 3798:c8b3d3d13ed1 SDL-ryan-multiple-audio-device

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Audio bootstraps can now specify that a driver is only to be used if explicitly requested (for things like the "disk" driver that is always available but you would never want to default to using). Trimmed out code that can be handled by stubs in the core. The "dummy" driver is pretty damned small now. :)
author Ryan C. Gordon <icculus@icculus.org>
date Wed, 04 Oct 2006 21:27:53 +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: */