Mercurial > sdl-ios-xcode
annotate src/timer/linux/SDL_systimer.c @ 1157:baf35853ad54
Date: Mon, 10 Oct 2005 13:09:32 +0300
From: Tommi Kyntola <tommi.kyntola@ray.fi>
To: sdl@libsdl.org
Subject: [SDL] [RFC] get_ticks broken on linux
It uses gettimeofday to calculate the timedifference.
Gettimeofday returns current time which is seldom monotonous.
This breaks SDL timer subsystem. (time callbacks and all that
get borked when the time difference ms is suddenly ~ 2^32)
I posted a message about this earlier but got no response.
Some thoughts on this matter would be appreciated.
(Or even an explanation for the lack of interest.)
A patch below would use the posix timers that have been around
since posix 93 and do provide a good source of monotonous time
on linux boxes (and on few others too).
The following patch is also availabe at:
http://www.hut.fi/u/tkyntola/SDL-1.2.9-clockfix.patch
It's against 1.2.9, but I can easily rediffit against
the cvs branch is needed.
cheers,
Tommi Kyntola tommi.kyntola@ray.fi
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Tue, 11 Oct 2005 18:16:12 +0000 |
| parents | 8521404a33c7 |
| children | ec446adf8cb2 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
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21 |
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22 RDTSC stuff by lompik (lompik@voila.fr) 20/03/2002 |
| 0 | 23 */ |
| 24 | |
| 25 #ifdef SAVE_RCSID | |
| 26 static char rcsid = | |
| 27 "@(#) $Id$"; | |
| 28 #endif | |
| 29 | |
| 30 #include <stdio.h> | |
| 31 #include <sys/time.h> | |
| 32 #include <signal.h> | |
| 33 #include <unistd.h> | |
| 34 #include <string.h> | |
| 35 #include <errno.h> | |
| 36 | |
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37 /* The clock_gettime provides monotonous time, so we should use it if |
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38 it's available. The clock_gettime function is behind ifdef |
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39 for __USE_POSIX199309 |
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40 Tommi Kyntola (tommi.kyntola@ray.fi) 27/09/2005 |
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41 */ |
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42 #if (defined _POSIX_TIMERS && _POSIX_TIMERS > 0) |
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43 #include <time.h> |
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44 #define USE_CLOCK_GETTIME |
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45 #endif |
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46 |
| 0 | 47 #include "SDL_error.h" |
| 48 #include "SDL_timer.h" | |
| 49 #include "SDL_timer_c.h" | |
| 50 | |
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51 #if _POSIX_THREAD_SYSCALL_SOFT |
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52 #include <pthread.h> |
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53 #endif |
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54 #ifdef ENABLE_PTH |
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55 #include <pth.h> |
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56 #endif |
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57 |
| 0 | 58 #if defined(DISABLE_THREADS) || defined(FORK_HACK) |
| 59 #define USE_ITIMER | |
| 60 #endif | |
| 61 | |
| 62 /* The following defines should really be determined at configure time */ | |
| 63 | |
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64 #if defined(linux) |
| 0 | 65 /* Linux select() changes its timeout parameter upon return to contain |
| 66 the remaining time. Most other unixen leave it unchanged or undefined. */ | |
| 67 #define SELECT_SETS_REMAINING | |
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68 #elif defined(__bsdi__) || defined(__FreeBSD__) || defined(__sun) || defined(MACOSX) |
| 0 | 69 #define USE_NANOSLEEP |
| 70 #endif | |
| 71 | |
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72 #if defined(i386) || defined(__i386__) |
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73 /* This only works on pentium or newer x86 processors */ |
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74 /* Actually, this isn't reliable on multi-cpu systems, so is disabled */ |
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75 /*#define USE_RDTSC*/ |
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76 #endif |
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77 |
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78 |
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79 #ifdef USE_RDTSC |
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80 |
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81 /* The first ticks value of the application */ |
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82 static unsigned long long start; |
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83 static float cpu_mhz1000 = 0.0f; |
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84 |
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85 #if 1 |
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86 /* This is for old binutils version that don't recognize rdtsc mnemonics. |
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87 But all binutils version supports this. |
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88 */ |
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89 #define rdtsc(t) asm __volatile__ (".byte 0x0f, 0x31; " : "=A" (t)) |
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90 #else |
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91 #define rdtsc(t) asm __volatile__ ("rdtsc" : "=A" (t)) |
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92 #endif |
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93 |
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94 static float calc_cpu_mhz(void) |
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95 { |
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96 float cpu_mhz; |
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97 unsigned long long tsc_start; |
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98 unsigned long long tsc_end; |
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99 /* Slight code doubling here for the sake of readability */ |
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100 #ifdef USE_CLOCK_GETTIME |
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101 struct timespec tv_start, tv_end; |
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102 long usec_delay; |
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103 |
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104 rdtsc(tsc_start); |
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105 clock_gettime(CLOCK_MONOTONIC,&tv_start); |
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106 sleep(1); |
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107 rdtsc(tsc_end); |
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108 clock_gettime(CLOCK_MONOTONIC,&tv_end); |
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109 usec_delay = (1000000000L * (tv_end.tv_sec - tv_start.tv_sec) + |
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110 (tv_end.tv_nsec - tv_start.tv_nsec)) / 1000; |
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111 #else |
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112 struct timeval tv_start, tv_end; |
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113 long usec_delay; |
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114 |
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115 rdtsc(tsc_start); |
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116 gettimeofday(&tv_start, NULL); |
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117 sleep(1); |
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118 rdtsc(tsc_end); |
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119 gettimeofday(&tv_end, NULL); |
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120 usec_delay = 1000000L * (tv_end.tv_sec - tv_start.tv_sec) + |
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121 (tv_end.tv_usec - tv_start.tv_usec); |
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122 #endif /* USE_CLOCK_GETTIME */ |
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123 cpu_mhz = (float)(tsc_end-tsc_start) / usec_delay; |
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124 #if 0 |
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125 printf("cpu MHz\t\t: %.3f\n", cpu_mhz); |
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126 #endif |
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127 return cpu_mhz; |
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128 } |
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129 |
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130 #else |
| 0 | 131 |
| 132 /* The first ticks value of the application */ | |
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133 #ifdef USE_CLOCK_GETTIME |
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134 static struct timespec start; |
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135 #else |
| 0 | 136 static struct timeval start; |
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137 #endif /* USE_CLOCK_GETTIME */ |
| 0 | 138 |
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139 #endif /* USE_RDTSC */ |
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140 |
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141 |
| 0 | 142 void SDL_StartTicks(void) |
| 143 { | |
| 144 /* Set first ticks value */ | |
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145 #ifdef USE_RDTSC |
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146 if ( ! cpu_mhz1000 ) { |
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147 cpu_mhz1000 = calc_cpu_mhz() * 1000.0f; |
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148 } |
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149 rdtsc(start); |
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150 #elif defined(USE_CLOCK_GETTIME) |
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151 clock_gettime(CLOCK_MONOTONIC,&start); |
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152 #else |
| 0 | 153 gettimeofday(&start, NULL); |
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154 #endif |
| 0 | 155 } |
| 156 | |
| 157 Uint32 SDL_GetTicks (void) | |
| 158 { | |
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159 #ifdef USE_RDTSC |
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160 unsigned long long now; |
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161 if ( ! cpu_mhz1000 ) { |
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162 return 0; /* Shouldn't happen. BUG!! */ |
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163 } |
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164 rdtsc(now); |
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165 return (Uint32)((now-start)/cpu_mhz1000); |
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166 #elif defined(USE_CLOCK_GETTIME) |
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167 Uint32 ticks; |
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168 struct timespec now; |
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169 clock_gettime(CLOCK_MONOTONIC,&now); |
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170 ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_nsec-start.tv_nsec)/1000000; |
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171 return(ticks); |
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172 #else |
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173 Uint32 ticks; |
| 0 | 174 struct timeval now; |
| 175 gettimeofday(&now, NULL); | |
| 176 ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_usec-start.tv_usec)/1000; | |
| 177 return(ticks); | |
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178 #endif |
| 0 | 179 } |
| 180 | |
| 181 void SDL_Delay (Uint32 ms) | |
| 182 { | |
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183 #ifdef ENABLE_PTH |
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184 pth_time_t tv; |
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185 tv.tv_sec = ms/1000; |
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186 tv.tv_usec = (ms%1000)*1000; |
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187 pth_nap(tv); |
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188 #else |
| 0 | 189 int was_error; |
| 190 | |
| 191 #ifdef USE_NANOSLEEP | |
| 192 struct timespec elapsed, tv; | |
| 193 #else | |
| 194 struct timeval tv; | |
| 195 #ifndef SELECT_SETS_REMAINING | |
| 196 Uint32 then, now, elapsed; | |
| 197 #endif | |
| 198 #endif | |
| 199 | |
| 200 /* Set the timeout interval - Linux only needs to do this once */ | |
| 201 #ifdef SELECT_SETS_REMAINING | |
| 202 tv.tv_sec = ms/1000; | |
| 203 tv.tv_usec = (ms%1000)*1000; | |
| 204 #elif defined(USE_NANOSLEEP) | |
| 205 elapsed.tv_sec = ms/1000; | |
| 206 elapsed.tv_nsec = (ms%1000)*1000000; | |
| 207 #else | |
| 208 then = SDL_GetTicks(); | |
| 209 #endif | |
| 210 do { | |
| 211 errno = 0; | |
| 212 | |
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213 #if _POSIX_THREAD_SYSCALL_SOFT |
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214 pthread_yield_np(); |
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215 #endif |
| 0 | 216 #ifdef USE_NANOSLEEP |
| 217 tv.tv_sec = elapsed.tv_sec; | |
| 218 tv.tv_nsec = elapsed.tv_nsec; | |
| 219 was_error = nanosleep(&tv, &elapsed); | |
| 220 #else | |
| 221 #ifndef SELECT_SETS_REMAINING | |
| 222 /* Calculate the time interval left (in case of interrupt) */ | |
| 223 now = SDL_GetTicks(); | |
| 224 elapsed = (now-then); | |
| 225 then = now; | |
| 226 if ( elapsed >= ms ) { | |
| 227 break; | |
| 228 } | |
| 229 ms -= elapsed; | |
| 230 tv.tv_sec = ms/1000; | |
| 231 tv.tv_usec = (ms%1000)*1000; | |
| 232 #endif | |
| 233 was_error = select(0, NULL, NULL, NULL, &tv); | |
| 234 #endif /* USE_NANOSLEEP */ | |
| 235 } while ( was_error && (errno == EINTR) ); | |
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236 #endif /* ENABLE_PTH */ |
| 0 | 237 } |
| 238 | |
| 239 #ifdef USE_ITIMER | |
| 240 | |
| 241 static void HandleAlarm(int sig) | |
| 242 { | |
| 243 Uint32 ms; | |
| 244 | |
| 245 if ( SDL_alarm_callback ) { | |
| 246 ms = (*SDL_alarm_callback)(SDL_alarm_interval); | |
| 247 if ( ms != SDL_alarm_interval ) { | |
| 248 SDL_SetTimer(ms, SDL_alarm_callback); | |
| 249 } | |
| 250 } | |
| 251 } | |
| 252 | |
| 253 int SDL_SYS_TimerInit(void) | |
| 254 { | |
| 255 struct sigaction action; | |
| 256 | |
| 257 /* Set the alarm handler (Linux specific) */ | |
| 258 memset(&action, 0, sizeof(action)); | |
| 259 action.sa_handler = HandleAlarm; | |
| 260 action.sa_flags = SA_RESTART; | |
| 261 sigemptyset(&action.sa_mask); | |
| 262 sigaction(SIGALRM, &action, NULL); | |
| 263 return(0); | |
| 264 } | |
| 265 | |
| 266 void SDL_SYS_TimerQuit(void) | |
| 267 { | |
| 268 SDL_SetTimer(0, NULL); | |
| 269 } | |
| 270 | |
| 271 int SDL_SYS_StartTimer(void) | |
| 272 { | |
| 273 struct itimerval timer; | |
| 274 | |
| 275 timer.it_value.tv_sec = (SDL_alarm_interval/1000); | |
| 276 timer.it_value.tv_usec = (SDL_alarm_interval%1000)*1000; | |
| 277 timer.it_interval.tv_sec = (SDL_alarm_interval/1000); | |
| 278 timer.it_interval.tv_usec = (SDL_alarm_interval%1000)*1000; | |
| 279 setitimer(ITIMER_REAL, &timer, NULL); | |
| 280 return(0); | |
| 281 } | |
| 282 | |
| 283 void SDL_SYS_StopTimer(void) | |
| 284 { | |
| 285 struct itimerval timer; | |
| 286 | |
| 287 memset(&timer, 0, (sizeof timer)); | |
| 288 setitimer(ITIMER_REAL, &timer, NULL); | |
| 289 } | |
| 290 | |
| 291 #else /* USE_ITIMER */ | |
| 292 | |
| 293 #include "SDL_thread.h" | |
| 294 | |
| 295 /* Data to handle a single periodic alarm */ | |
| 296 static int timer_alive = 0; | |
| 297 static SDL_Thread *timer = NULL; | |
| 298 | |
| 299 static int RunTimer(void *unused) | |
| 300 { | |
| 301 while ( timer_alive ) { | |
| 302 if ( SDL_timer_running ) { | |
| 303 SDL_ThreadedTimerCheck(); | |
| 304 } | |
| 305 SDL_Delay(1); | |
| 306 } | |
| 307 return(0); | |
| 308 } | |
| 309 | |
| 310 /* This is only called if the event thread is not running */ | |
| 311 int SDL_SYS_TimerInit(void) | |
| 312 { | |
| 313 timer_alive = 1; | |
| 314 timer = SDL_CreateThread(RunTimer, NULL); | |
| 315 if ( timer == NULL ) | |
| 316 return(-1); | |
| 317 return(SDL_SetTimerThreaded(1)); | |
| 318 } | |
| 319 | |
| 320 void SDL_SYS_TimerQuit(void) | |
| 321 { | |
| 322 timer_alive = 0; | |
| 323 if ( timer ) { | |
| 324 SDL_WaitThread(timer, NULL); | |
| 325 timer = NULL; | |
| 326 } | |
| 327 } | |
| 328 | |
| 329 int SDL_SYS_StartTimer(void) | |
| 330 { | |
| 331 SDL_SetError("Internal logic error: Linux uses threaded timer"); | |
| 332 return(-1); | |
| 333 } | |
| 334 | |
| 335 void SDL_SYS_StopTimer(void) | |
| 336 { | |
| 337 return; | |
| 338 } | |
| 339 | |
| 340 #endif /* USE_ITIMER */ |