Mercurial > sdl-ios-xcode
annotate src/timer/linux/SDL_systimer.c @ 1156:8521404a33c7
Date: Tue, 11 Oct 2005 16:58:12 +0300 (EEST)
From: =?ISO-8859-1?Q?Martin_Storsj=F6?= <martin@martin.st>
To: sdl@libsdl.org
Subject: [SDL] [PATCH] Use nanosleep on OS X
Hi,
The current version of SDL_Delay on OS X seems to always sleep at least 10
msec. OS X has nanosleep(), which performs shorter sleeps well. The
attached patch makes it use that one instead of select() as currently.
// Martin
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Tue, 11 Oct 2005 17:33:03 +0000 |
| parents | b8d311d90021 |
| children | baf35853ad54 |
| 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 | |
| 37 #include "SDL_error.h" | |
| 38 #include "SDL_timer.h" | |
| 39 #include "SDL_timer_c.h" | |
| 40 | |
|
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41 #if _POSIX_THREAD_SYSCALL_SOFT |
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42 #include <pthread.h> |
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43 #endif |
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44 #ifdef ENABLE_PTH |
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45 #include <pth.h> |
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46 #endif |
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47 |
| 0 | 48 #if defined(DISABLE_THREADS) || defined(FORK_HACK) |
| 49 #define USE_ITIMER | |
| 50 #endif | |
| 51 | |
| 52 /* The following defines should really be determined at configure time */ | |
| 53 | |
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54 #if defined(linux) |
| 0 | 55 /* Linux select() changes its timeout parameter upon return to contain |
| 56 the remaining time. Most other unixen leave it unchanged or undefined. */ | |
| 57 #define SELECT_SETS_REMAINING | |
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58 #elif defined(__bsdi__) || defined(__FreeBSD__) || defined(__sun) || defined(MACOSX) |
| 0 | 59 #define USE_NANOSLEEP |
| 60 #endif | |
| 61 | |
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62 #if defined(i386) || defined(__i386__) |
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63 /* This only works on pentium or newer x86 processors */ |
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64 /* Actually, this isn't reliable on multi-cpu systems, so is disabled */ |
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65 /*#define USE_RDTSC*/ |
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66 #endif |
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67 |
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68 |
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69 #ifdef USE_RDTSC |
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70 |
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71 /* The first ticks value of the application */ |
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72 static unsigned long long start; |
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73 static float cpu_mhz1000 = 0.0f; |
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74 |
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75 #if 1 |
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76 /* This is for old binutils version that don't recognize rdtsc mnemonics. |
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77 But all binutils version supports this. |
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78 */ |
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79 #define rdtsc(t) asm __volatile__ (".byte 0x0f, 0x31; " : "=A" (t)) |
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80 #else |
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81 #define rdtsc(t) asm __volatile__ ("rdtsc" : "=A" (t)) |
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82 #endif |
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83 |
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84 static float calc_cpu_mhz(void) |
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85 { |
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86 float cpu_mhz; |
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87 unsigned long long tsc_start; |
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88 unsigned long long tsc_end; |
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89 struct timeval tv_start, tv_end; |
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90 long usec_delay; |
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91 |
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92 rdtsc(tsc_start); |
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93 gettimeofday(&tv_start, NULL); |
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94 sleep(1); |
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95 rdtsc(tsc_end); |
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96 gettimeofday(&tv_end, NULL); |
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97 usec_delay = 1000000L * (tv_end.tv_sec - tv_start.tv_sec) + |
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98 (tv_end.tv_usec - tv_start.tv_usec); |
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99 cpu_mhz = (float)(tsc_end-tsc_start) / usec_delay; |
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100 #if 0 |
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101 printf("cpu MHz\t\t: %.3f\n", cpu_mhz); |
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102 #endif |
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103 return cpu_mhz; |
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104 } |
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105 |
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106 #else |
| 0 | 107 |
| 108 /* The first ticks value of the application */ | |
| 109 static struct timeval start; | |
| 110 | |
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111 #endif /* USE_RDTSC */ |
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112 |
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113 |
| 0 | 114 void SDL_StartTicks(void) |
| 115 { | |
| 116 /* Set first ticks value */ | |
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117 #ifdef USE_RDTSC |
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118 if ( ! cpu_mhz1000 ) { |
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119 cpu_mhz1000 = calc_cpu_mhz() * 1000.0f; |
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120 } |
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121 rdtsc(start); |
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122 #else |
| 0 | 123 gettimeofday(&start, NULL); |
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124 #endif /* USE_RDTSC */ |
| 0 | 125 } |
| 126 | |
| 127 Uint32 SDL_GetTicks (void) | |
| 128 { | |
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129 #ifdef USE_RDTSC |
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130 unsigned long long now; |
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131 if ( ! cpu_mhz1000 ) { |
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132 return 0; /* Shouldn't happen. BUG!! */ |
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133 } |
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134 rdtsc(now); |
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135 return (Uint32)((now-start)/cpu_mhz1000); |
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136 #else |
| 0 | 137 struct timeval now; |
| 138 Uint32 ticks; | |
| 139 | |
| 140 gettimeofday(&now, NULL); | |
| 141 ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_usec-start.tv_usec)/1000; | |
| 142 return(ticks); | |
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143 #endif /* USE_RDTSC */ |
| 0 | 144 } |
| 145 | |
| 146 void SDL_Delay (Uint32 ms) | |
| 147 { | |
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148 #ifdef ENABLE_PTH |
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149 pth_time_t tv; |
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150 tv.tv_sec = ms/1000; |
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151 tv.tv_usec = (ms%1000)*1000; |
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152 pth_nap(tv); |
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153 #else |
| 0 | 154 int was_error; |
| 155 | |
| 156 #ifdef USE_NANOSLEEP | |
| 157 struct timespec elapsed, tv; | |
| 158 #else | |
| 159 struct timeval tv; | |
| 160 #ifndef SELECT_SETS_REMAINING | |
| 161 Uint32 then, now, elapsed; | |
| 162 #endif | |
| 163 #endif | |
| 164 | |
| 165 /* Set the timeout interval - Linux only needs to do this once */ | |
| 166 #ifdef SELECT_SETS_REMAINING | |
| 167 tv.tv_sec = ms/1000; | |
| 168 tv.tv_usec = (ms%1000)*1000; | |
| 169 #elif defined(USE_NANOSLEEP) | |
| 170 elapsed.tv_sec = ms/1000; | |
| 171 elapsed.tv_nsec = (ms%1000)*1000000; | |
| 172 #else | |
| 173 then = SDL_GetTicks(); | |
| 174 #endif | |
| 175 do { | |
| 176 errno = 0; | |
| 177 | |
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178 #if _POSIX_THREAD_SYSCALL_SOFT |
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179 pthread_yield_np(); |
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180 #endif |
| 0 | 181 #ifdef USE_NANOSLEEP |
| 182 tv.tv_sec = elapsed.tv_sec; | |
| 183 tv.tv_nsec = elapsed.tv_nsec; | |
| 184 was_error = nanosleep(&tv, &elapsed); | |
| 185 #else | |
| 186 #ifndef SELECT_SETS_REMAINING | |
| 187 /* Calculate the time interval left (in case of interrupt) */ | |
| 188 now = SDL_GetTicks(); | |
| 189 elapsed = (now-then); | |
| 190 then = now; | |
| 191 if ( elapsed >= ms ) { | |
| 192 break; | |
| 193 } | |
| 194 ms -= elapsed; | |
| 195 tv.tv_sec = ms/1000; | |
| 196 tv.tv_usec = (ms%1000)*1000; | |
| 197 #endif | |
| 198 was_error = select(0, NULL, NULL, NULL, &tv); | |
| 199 #endif /* USE_NANOSLEEP */ | |
| 200 } while ( was_error && (errno == EINTR) ); | |
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201 #endif /* ENABLE_PTH */ |
| 0 | 202 } |
| 203 | |
| 204 #ifdef USE_ITIMER | |
| 205 | |
| 206 static void HandleAlarm(int sig) | |
| 207 { | |
| 208 Uint32 ms; | |
| 209 | |
| 210 if ( SDL_alarm_callback ) { | |
| 211 ms = (*SDL_alarm_callback)(SDL_alarm_interval); | |
| 212 if ( ms != SDL_alarm_interval ) { | |
| 213 SDL_SetTimer(ms, SDL_alarm_callback); | |
| 214 } | |
| 215 } | |
| 216 } | |
| 217 | |
| 218 int SDL_SYS_TimerInit(void) | |
| 219 { | |
| 220 struct sigaction action; | |
| 221 | |
| 222 /* Set the alarm handler (Linux specific) */ | |
| 223 memset(&action, 0, sizeof(action)); | |
| 224 action.sa_handler = HandleAlarm; | |
| 225 action.sa_flags = SA_RESTART; | |
| 226 sigemptyset(&action.sa_mask); | |
| 227 sigaction(SIGALRM, &action, NULL); | |
| 228 return(0); | |
| 229 } | |
| 230 | |
| 231 void SDL_SYS_TimerQuit(void) | |
| 232 { | |
| 233 SDL_SetTimer(0, NULL); | |
| 234 } | |
| 235 | |
| 236 int SDL_SYS_StartTimer(void) | |
| 237 { | |
| 238 struct itimerval timer; | |
| 239 | |
| 240 timer.it_value.tv_sec = (SDL_alarm_interval/1000); | |
| 241 timer.it_value.tv_usec = (SDL_alarm_interval%1000)*1000; | |
| 242 timer.it_interval.tv_sec = (SDL_alarm_interval/1000); | |
| 243 timer.it_interval.tv_usec = (SDL_alarm_interval%1000)*1000; | |
| 244 setitimer(ITIMER_REAL, &timer, NULL); | |
| 245 return(0); | |
| 246 } | |
| 247 | |
| 248 void SDL_SYS_StopTimer(void) | |
| 249 { | |
| 250 struct itimerval timer; | |
| 251 | |
| 252 memset(&timer, 0, (sizeof timer)); | |
| 253 setitimer(ITIMER_REAL, &timer, NULL); | |
| 254 } | |
| 255 | |
| 256 #else /* USE_ITIMER */ | |
| 257 | |
| 258 #include "SDL_thread.h" | |
| 259 | |
| 260 /* Data to handle a single periodic alarm */ | |
| 261 static int timer_alive = 0; | |
| 262 static SDL_Thread *timer = NULL; | |
| 263 | |
| 264 static int RunTimer(void *unused) | |
| 265 { | |
| 266 while ( timer_alive ) { | |
| 267 if ( SDL_timer_running ) { | |
| 268 SDL_ThreadedTimerCheck(); | |
| 269 } | |
| 270 SDL_Delay(1); | |
| 271 } | |
| 272 return(0); | |
| 273 } | |
| 274 | |
| 275 /* This is only called if the event thread is not running */ | |
| 276 int SDL_SYS_TimerInit(void) | |
| 277 { | |
| 278 timer_alive = 1; | |
| 279 timer = SDL_CreateThread(RunTimer, NULL); | |
| 280 if ( timer == NULL ) | |
| 281 return(-1); | |
| 282 return(SDL_SetTimerThreaded(1)); | |
| 283 } | |
| 284 | |
| 285 void SDL_SYS_TimerQuit(void) | |
| 286 { | |
| 287 timer_alive = 0; | |
| 288 if ( timer ) { | |
| 289 SDL_WaitThread(timer, NULL); | |
| 290 timer = NULL; | |
| 291 } | |
| 292 } | |
| 293 | |
| 294 int SDL_SYS_StartTimer(void) | |
| 295 { | |
| 296 SDL_SetError("Internal logic error: Linux uses threaded timer"); | |
| 297 return(-1); | |
| 298 } | |
| 299 | |
| 300 void SDL_SYS_StopTimer(void) | |
| 301 { | |
| 302 return; | |
| 303 } | |
| 304 | |
| 305 #endif /* USE_ITIMER */ |