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annotate src/timer/unix/SDL_systimer.c @ 1361:19418e4422cb

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New configure-based build system. Still work in progress, but much improved
author Sam Lantinga <slouken@libsdl.org>
date Thu, 16 Feb 2006 10:11:48 +0000
parents
children 1736c5e2173f
rev   line source
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
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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
19418e4422cb New configure-based build system. Still work in progress, but much improved
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5 This library is free software; you can redistribute it and/or
19418e4422cb New configure-based build system. Still work in progress, but much improved
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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
19418e4422cb New configure-based build system. Still work in progress, but much improved
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10 This library is distributed in the hope that it will be useful,
19418e4422cb New configure-based build system. Still work in progress, but much improved
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
19418e4422cb New configure-based build system. Still work in progress, but much improved
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19418e4422cb New configure-based build system. Still work in progress, but much improved
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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
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23 #include <stdio.h>
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24 #include <sys/time.h>
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25 #include <signal.h>
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26 #include <unistd.h>
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27 #include <string.h>
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28 #include <errno.h>
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29
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30 #include "SDL_timer.h"
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31 #include "../SDL_timer_c.h"
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32
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33 /* The clock_gettime provides monotonous time, so we should use it if
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34 it's available. The clock_gettime function is behind ifdef
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35 for __USE_POSIX199309
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36 Tommi Kyntola (tommi.kyntola@ray.fi) 27/09/2005
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37 */
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38 #if HAVE_CLOCK_GETTIME
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39 #include <time.h>
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40 #endif
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41
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42 #if SDL_THREAD_PTH
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43 #include <pth.h>
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44 #elif _POSIX_THREAD_SYSCALL_SOFT
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45 #include <pthread.h>
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46 #endif
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47
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48 #if SDL_THREADS_DISABLED
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49 #define USE_ITIMER
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50 #endif
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51
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52 /* The first ticks value of the application */
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53 #ifdef HAVE_CLOCK_GETTIME
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54 static struct timespec start;
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55 #else
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56 static struct timeval start;
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57 #endif /* HAVE_CLOCK_GETTIME */
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58
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59
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60 void SDL_StartTicks(void)
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61 {
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62 /* Set first ticks value */
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63 #if HAVE_CLOCK_GETTIME
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64 clock_gettime(CLOCK_MONOTONIC,&start);
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65 #else
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66 gettimeofday(&start, NULL);
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67 #endif
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68 }
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69
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70 Uint32 SDL_GetTicks (void)
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71 {
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72 #if HAVE_CLOCK_GETTIME
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73 Uint32 ticks;
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74 struct timespec now;
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75 clock_gettime(CLOCK_MONOTONIC,&now);
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76 ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_nsec-start.tv_nsec)/1000000;
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77 return(ticks);
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78 #else
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79 Uint32 ticks;
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80 struct timeval now;
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81 gettimeofday(&now, NULL);
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82 ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_usec-start.tv_usec)/1000;
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83 return(ticks);
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84 #endif
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85 }
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86
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87 void SDL_Delay (Uint32 ms)
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88 {
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89 #if SDL_THREAD_PTH
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90 pth_time_t tv;
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91 tv.tv_sec = ms/1000;
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92 tv.tv_usec = (ms%1000)*1000;
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93 pth_nap(tv);
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94 #else
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95 int was_error;
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96
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97 #if HAVE_NANOSLEEP
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98 struct timespec elapsed, tv;
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99 #else
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100 struct timeval tv;
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101 Uint32 then, now, elapsed;
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102 #endif
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103
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104 /* Set the timeout interval */
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105 #if HAVE_NANOSLEEP
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106 elapsed.tv_sec = ms/1000;
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107 elapsed.tv_nsec = (ms%1000)*1000000;
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108 #else
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109 then = SDL_GetTicks();
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110 #endif
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111 do {
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112 errno = 0;
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113
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114 #if _POSIX_THREAD_SYSCALL_SOFT
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115 pthread_yield_np();
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116 #endif
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117 #if HAVE_NANOSLEEP
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118 tv.tv_sec = elapsed.tv_sec;
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119 tv.tv_nsec = elapsed.tv_nsec;
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120 was_error = nanosleep(&tv, &elapsed);
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121 #else
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122 /* Calculate the time interval left (in case of interrupt) */
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123 now = SDL_GetTicks();
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124 elapsed = (now-then);
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125 then = now;
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126 if ( elapsed >= ms ) {
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127 break;
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128 }
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129 ms -= elapsed;
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130 tv.tv_sec = ms/1000;
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131 tv.tv_usec = (ms%1000)*1000;
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132
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133 was_error = select(0, NULL, NULL, NULL, &tv);
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134 #endif /* HAVE_NANOSLEEP */
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135 } while ( was_error && (errno == EINTR) );
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136 #endif /* SDL_THREAD_PTH */
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137 }
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138
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139 #ifdef USE_ITIMER
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140
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141 static void HandleAlarm(int sig)
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142 {
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143 Uint32 ms;
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144
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145 if ( SDL_alarm_callback ) {
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146 ms = (*SDL_alarm_callback)(SDL_alarm_interval);
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147 if ( ms != SDL_alarm_interval ) {
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148 SDL_SetTimer(ms, SDL_alarm_callback);
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149 }
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150 }
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151 }
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152
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153 int SDL_SYS_TimerInit(void)
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154 {
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155 struct sigaction action;
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156
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157 /* Set the alarm handler (Linux specific) */
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158 SDL_memset(&action, 0, sizeof(action));
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159 action.sa_handler = HandleAlarm;
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160 action.sa_flags = SA_RESTART;
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161 sigemptyset(&action.sa_mask);
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162 sigaction(SIGALRM, &action, NULL);
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163 return(0);
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164 }
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165
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166 void SDL_SYS_TimerQuit(void)
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167 {
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168 SDL_SetTimer(0, NULL);
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169 }
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170
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171 int SDL_SYS_StartTimer(void)
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172 {
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173 struct itimerval timer;
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174
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175 timer.it_value.tv_sec = (SDL_alarm_interval/1000);
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176 timer.it_value.tv_usec = (SDL_alarm_interval%1000)*1000;
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177 timer.it_interval.tv_sec = (SDL_alarm_interval/1000);
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178 timer.it_interval.tv_usec = (SDL_alarm_interval%1000)*1000;
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179 setitimer(ITIMER_REAL, &timer, NULL);
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180 return(0);
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181 }
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182
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183 void SDL_SYS_StopTimer(void)
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184 {
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185 struct itimerval timer;
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186
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187 SDL_memset(&timer, 0, (sizeof timer));
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188 setitimer(ITIMER_REAL, &timer, NULL);
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189 }
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190
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191 #else /* USE_ITIMER */
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192
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193 #include "SDL_thread.h"
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194
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195 /* Data to handle a single periodic alarm */
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196 static int timer_alive = 0;
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197 static SDL_Thread *timer = NULL;
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198
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199 static int RunTimer(void *unused)
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200 {
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201 while ( timer_alive ) {
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202 if ( SDL_timer_running ) {
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203 SDL_ThreadedTimerCheck();
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204 }
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205 SDL_Delay(1);
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206 }
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207 return(0);
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208 }
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209
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210 /* This is only called if the event thread is not running */
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211 int SDL_SYS_TimerInit(void)
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212 {
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213 timer_alive = 1;
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214 timer = SDL_CreateThread(RunTimer, NULL);
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215 if ( timer == NULL )
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216 return(-1);
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217 return(SDL_SetTimerThreaded(1));
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218 }
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219
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220 void SDL_SYS_TimerQuit(void)
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221 {
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222 timer_alive = 0;
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223 if ( timer ) {
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224 SDL_WaitThread(timer, NULL);
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225 timer = NULL;
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226 }
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227 }
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228
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229 int SDL_SYS_StartTimer(void)
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230 {
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231 SDL_SetError("Internal logic error: Linux uses threaded timer");
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232 return(-1);
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233 }
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234
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235 void SDL_SYS_StopTimer(void)
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236 {
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237 return;
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238 }
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239
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240 #endif /* USE_ITIMER */