Mercurial > sdl-ios-xcode
annotate src/timer/unix/SDL_systimer.c @ 3656:f17ea6f49745
Assume _exit() is available. It may be, even if unix isn't defined.
If we really have to, we can add a configure check for it.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Wed, 13 Jan 2010 08:30:34 +0000 |
parents | 99210400e8b9 |
children | 47d923feedb0 |
rev | line source |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
2859 | 3 Copyright (C) 1997-2009 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 } while (was_error && (errno == EINTR)); |
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141 #endif /* SDL_THREAD_PTH */ |
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142 } |
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143 |
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144 #ifdef USE_ITIMER |
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145 |
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146 static void |
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147 HandleAlarm(int sig) |
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148 { |
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149 Uint32 ms; |
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150 |
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151 if (SDL_alarm_callback) { |
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152 ms = (*SDL_alarm_callback) (SDL_alarm_interval); |
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153 if (ms != SDL_alarm_interval) { |
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154 SDL_SetTimer(ms, SDL_alarm_callback); |
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155 } |
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156 } |
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157 } |
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158 |
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159 int |
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160 SDL_SYS_TimerInit(void) |
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161 { |
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162 struct sigaction action; |
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163 |
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164 /* Set the alarm handler (Linux specific) */ |
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165 SDL_memset(&action, 0, sizeof(action)); |
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166 action.sa_handler = HandleAlarm; |
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167 action.sa_flags = SA_RESTART; |
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168 sigemptyset(&action.sa_mask); |
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169 sigaction(SIGALRM, &action, NULL); |
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170 return (0); |
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171 } |
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172 |
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173 void |
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174 SDL_SYS_TimerQuit(void) |
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175 { |
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176 SDL_SetTimer(0, NULL); |
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177 } |
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178 |
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179 int |
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180 SDL_SYS_StartTimer(void) |
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181 { |
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182 struct itimerval timer; |
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183 |
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184 timer.it_value.tv_sec = (SDL_alarm_interval / 1000); |
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185 timer.it_value.tv_usec = (SDL_alarm_interval % 1000) * 1000; |
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186 timer.it_interval.tv_sec = (SDL_alarm_interval / 1000); |
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187 timer.it_interval.tv_usec = (SDL_alarm_interval % 1000) * 1000; |
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188 setitimer(ITIMER_REAL, &timer, NULL); |
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189 return (0); |
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190 } |
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191 |
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192 void |
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193 SDL_SYS_StopTimer(void) |
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194 { |
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195 struct itimerval timer; |
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196 |
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197 SDL_memset(&timer, 0, (sizeof timer)); |
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198 setitimer(ITIMER_REAL, &timer, NULL); |
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199 } |
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200 |
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201 #else /* USE_ITIMER */ |
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202 |
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203 #include "SDL_thread.h" |
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204 |
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205 /* Data to handle a single periodic alarm */ |
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206 static int timer_alive = 0; |
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207 static SDL_Thread *timer = NULL; |
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208 |
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209 static int |
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210 RunTimer(void *unused) |
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211 { |
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212 while (timer_alive) { |
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213 if (SDL_timer_running) { |
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214 SDL_ThreadedTimerCheck(); |
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215 } |
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216 SDL_Delay(1); |
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217 } |
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218 return (0); |
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219 } |
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220 |
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221 /* This is only called if the event thread is not running */ |
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222 int |
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223 SDL_SYS_TimerInit(void) |
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224 { |
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225 timer_alive = 1; |
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226 timer = SDL_CreateThread(RunTimer, NULL); |
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227 if (timer == NULL) |
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228 return (-1); |
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229 return (SDL_SetTimerThreaded(1)); |
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230 } |
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231 |
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232 void |
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233 SDL_SYS_TimerQuit(void) |
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234 { |
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235 timer_alive = 0; |
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236 if (timer) { |
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237 SDL_WaitThread(timer, NULL); |
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238 timer = NULL; |
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239 } |
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240 } |
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241 |
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242 int |
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243 SDL_SYS_StartTimer(void) |
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244 { |
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245 SDL_SetError("Internal logic error: Linux uses threaded timer"); |
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246 return (-1); |
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247 } |
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248 |
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249 void |
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250 SDL_SYS_StopTimer(void) |
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251 { |
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252 return; |
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253 } |
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254 |
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255 #endif /* USE_ITIMER */ |
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256 |
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257 #endif /* SDL_TIMER_UNIX */ |
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258 /* vi: set ts=4 sw=4 expandtab: */ |