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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 */ |
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239 |
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240 #endif /* SDL_TIMER_UNIX */ |