Mercurial > sdl-ios-xcode
annotate src/timer/linux/SDL_systimer.c @ 317:4e8827521296
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 24 Mar 2002 01:12:57 +0000 |
| parents | d85fc19bf840 |
| children | 71fe0b713085 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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 |
| 0 | 45 #if defined(DISABLE_THREADS) || defined(FORK_HACK) |
| 46 #define USE_ITIMER | |
| 47 #endif | |
| 48 | |
| 49 /* The following defines should really be determined at configure time */ | |
| 50 | |
|
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51 #if defined(linux) |
| 0 | 52 /* Linux select() changes its timeout parameter upon return to contain |
| 53 the remaining time. Most other unixen leave it unchanged or undefined. */ | |
| 54 #define SELECT_SETS_REMAINING | |
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55 #elif defined(__bsdi__) || defined(__FreeBSD__) || defined(__sun) |
| 0 | 56 #define USE_NANOSLEEP |
| 57 #endif | |
| 58 | |
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59 #if defined(i386) || defined(__i386__) |
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60 /* This only works on pentium or newer x86 processors */ |
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61 /* Actually, this isn't reliable on multi-cpu systems, so is disabled */ |
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62 /*#define USE_RDTSC*/ |
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63 #endif |
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64 |
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65 |
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66 #ifdef USE_RDTSC |
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67 |
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68 /* The first ticks value of the application */ |
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69 static unsigned long long start; |
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70 static float cpu_mhz1000 = 0.0f; |
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71 |
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72 #if 1 |
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73 /* This is for old binutils version that don't recognize rdtsc mnemonics. |
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74 But all binutils version supports this. |
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75 */ |
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76 #define rdtsc(t) asm(".byte 0x0f, 0x31; " : "=A" (t)); |
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77 #else |
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78 #define rdtsc(t) asm("rdtsc" : "=A" (t)); |
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79 #endif |
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80 |
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81 static float calc_cpu_mhz(void) |
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82 { |
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83 float cpu_mhz; |
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84 unsigned long long tsc_start; |
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85 unsigned long long tsc_end; |
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86 struct timeval tv_start, tv_end; |
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87 long usec_delay; |
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88 |
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89 rdtsc(tsc_start); |
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90 gettimeofday(&tv_start, NULL); |
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91 sleep(1); |
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92 rdtsc(tsc_end); |
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93 gettimeofday(&tv_end, NULL); |
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94 usec_delay = 1000000L * (tv_end.tv_sec - tv_start.tv_sec) + |
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95 (tv_end.tv_usec - tv_start.tv_usec); |
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96 cpu_mhz = (float)(tsc_end-tsc_start) / usec_delay; |
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97 #if 0 |
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98 printf("cpu MHz\t\t: %.3f\n", cpu_mhz); |
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99 #endif |
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100 return cpu_mhz; |
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101 } |
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102 |
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103 #else |
| 0 | 104 |
| 105 /* The first ticks value of the application */ | |
| 106 static struct timeval start; | |
| 107 | |
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108 #endif /* USE_RDTSC */ |
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109 |
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110 |
| 0 | 111 void SDL_StartTicks(void) |
| 112 { | |
| 113 /* Set first ticks value */ | |
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114 #ifdef USE_RDTSC |
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115 if ( ! cpu_mhz1000 ) { |
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116 cpu_mhz1000 = calc_cpu_mhz() * 1000.0f; |
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117 } |
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118 rdtsc(start); |
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119 #else |
| 0 | 120 gettimeofday(&start, NULL); |
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121 #endif /* USE_RDTSC */ |
| 0 | 122 } |
| 123 | |
| 124 Uint32 SDL_GetTicks (void) | |
| 125 { | |
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126 #ifdef USE_RDTSC |
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127 unsigned long long now; |
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128 if ( ! cpu_mhz1000 ) { |
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129 return 0; /* Shouldn't happen. BUG!! */ |
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130 } |
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131 rdtsc(now); |
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132 return (Uint32)((now-start)/cpu_mhz1000); |
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133 #else |
| 0 | 134 struct timeval now; |
| 135 Uint32 ticks; | |
| 136 | |
| 137 gettimeofday(&now, NULL); | |
| 138 ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_usec-start.tv_usec)/1000; | |
| 139 return(ticks); | |
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140 #endif /* USE_RDTSC */ |
| 0 | 141 } |
| 142 | |
| 143 void SDL_Delay (Uint32 ms) | |
| 144 { | |
| 145 int was_error; | |
| 146 | |
| 147 #ifdef USE_NANOSLEEP | |
| 148 struct timespec elapsed, tv; | |
| 149 #else | |
| 150 struct timeval tv; | |
| 151 #ifndef SELECT_SETS_REMAINING | |
| 152 Uint32 then, now, elapsed; | |
| 153 #endif | |
| 154 #endif | |
| 155 | |
| 156 /* Set the timeout interval - Linux only needs to do this once */ | |
| 157 #ifdef SELECT_SETS_REMAINING | |
| 158 tv.tv_sec = ms/1000; | |
| 159 tv.tv_usec = (ms%1000)*1000; | |
| 160 #elif defined(USE_NANOSLEEP) | |
| 161 elapsed.tv_sec = ms/1000; | |
| 162 elapsed.tv_nsec = (ms%1000)*1000000; | |
| 163 #else | |
| 164 then = SDL_GetTicks(); | |
| 165 #endif | |
| 166 do { | |
| 167 errno = 0; | |
| 168 | |
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169 #if _POSIX_THREAD_SYSCALL_SOFT |
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170 pthread_yield_np(); |
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171 #endif |
| 0 | 172 #ifdef USE_NANOSLEEP |
| 173 tv.tv_sec = elapsed.tv_sec; | |
| 174 tv.tv_nsec = elapsed.tv_nsec; | |
| 175 was_error = nanosleep(&tv, &elapsed); | |
| 176 #else | |
| 177 #ifndef SELECT_SETS_REMAINING | |
| 178 /* Calculate the time interval left (in case of interrupt) */ | |
| 179 now = SDL_GetTicks(); | |
| 180 elapsed = (now-then); | |
| 181 then = now; | |
| 182 if ( elapsed >= ms ) { | |
| 183 break; | |
| 184 } | |
| 185 ms -= elapsed; | |
| 186 tv.tv_sec = ms/1000; | |
| 187 tv.tv_usec = (ms%1000)*1000; | |
| 188 #endif | |
| 189 was_error = select(0, NULL, NULL, NULL, &tv); | |
| 190 #endif /* USE_NANOSLEEP */ | |
| 191 } while ( was_error && (errno == EINTR) ); | |
| 192 } | |
| 193 | |
| 194 #ifdef USE_ITIMER | |
| 195 | |
| 196 static void HandleAlarm(int sig) | |
| 197 { | |
| 198 Uint32 ms; | |
| 199 | |
| 200 if ( SDL_alarm_callback ) { | |
| 201 ms = (*SDL_alarm_callback)(SDL_alarm_interval); | |
| 202 if ( ms != SDL_alarm_interval ) { | |
| 203 SDL_SetTimer(ms, SDL_alarm_callback); | |
| 204 } | |
| 205 } | |
| 206 } | |
| 207 | |
| 208 int SDL_SYS_TimerInit(void) | |
| 209 { | |
| 210 struct sigaction action; | |
| 211 | |
| 212 /* Set the alarm handler (Linux specific) */ | |
| 213 memset(&action, 0, sizeof(action)); | |
| 214 action.sa_handler = HandleAlarm; | |
| 215 action.sa_flags = SA_RESTART; | |
| 216 sigemptyset(&action.sa_mask); | |
| 217 sigaction(SIGALRM, &action, NULL); | |
| 218 return(0); | |
| 219 } | |
| 220 | |
| 221 void SDL_SYS_TimerQuit(void) | |
| 222 { | |
| 223 SDL_SetTimer(0, NULL); | |
| 224 } | |
| 225 | |
| 226 int SDL_SYS_StartTimer(void) | |
| 227 { | |
| 228 struct itimerval timer; | |
| 229 | |
| 230 timer.it_value.tv_sec = (SDL_alarm_interval/1000); | |
| 231 timer.it_value.tv_usec = (SDL_alarm_interval%1000)*1000; | |
| 232 timer.it_interval.tv_sec = (SDL_alarm_interval/1000); | |
| 233 timer.it_interval.tv_usec = (SDL_alarm_interval%1000)*1000; | |
| 234 setitimer(ITIMER_REAL, &timer, NULL); | |
| 235 return(0); | |
| 236 } | |
| 237 | |
| 238 void SDL_SYS_StopTimer(void) | |
| 239 { | |
| 240 struct itimerval timer; | |
| 241 | |
| 242 memset(&timer, 0, (sizeof timer)); | |
| 243 setitimer(ITIMER_REAL, &timer, NULL); | |
| 244 } | |
| 245 | |
| 246 #else /* USE_ITIMER */ | |
| 247 | |
| 248 #include "SDL_thread.h" | |
| 249 | |
| 250 /* Data to handle a single periodic alarm */ | |
| 251 static int timer_alive = 0; | |
| 252 static SDL_Thread *timer = NULL; | |
| 253 | |
| 254 static int RunTimer(void *unused) | |
| 255 { | |
| 256 while ( timer_alive ) { | |
| 257 if ( SDL_timer_running ) { | |
| 258 SDL_ThreadedTimerCheck(); | |
| 259 } | |
| 260 SDL_Delay(1); | |
| 261 } | |
| 262 return(0); | |
| 263 } | |
| 264 | |
| 265 /* This is only called if the event thread is not running */ | |
| 266 int SDL_SYS_TimerInit(void) | |
| 267 { | |
| 268 timer_alive = 1; | |
| 269 timer = SDL_CreateThread(RunTimer, NULL); | |
| 270 if ( timer == NULL ) | |
| 271 return(-1); | |
| 272 return(SDL_SetTimerThreaded(1)); | |
| 273 } | |
| 274 | |
| 275 void SDL_SYS_TimerQuit(void) | |
| 276 { | |
| 277 timer_alive = 0; | |
| 278 if ( timer ) { | |
| 279 SDL_WaitThread(timer, NULL); | |
| 280 timer = NULL; | |
| 281 } | |
| 282 } | |
| 283 | |
| 284 int SDL_SYS_StartTimer(void) | |
| 285 { | |
| 286 SDL_SetError("Internal logic error: Linux uses threaded timer"); | |
| 287 return(-1); | |
| 288 } | |
| 289 | |
| 290 void SDL_SYS_StopTimer(void) | |
| 291 { | |
| 292 return; | |
| 293 } | |
| 294 | |
| 295 #endif /* USE_ITIMER */ |