Mercurial > MadButterfly
annotate src/timertool.c @ 120:5df7403b6fbc
Fix bug of get_now()
| author | Thinker K.F. Li <thinker@branda.to> |
|---|---|
| date | Sun, 14 Sep 2008 23:05:30 +0800 |
| parents | 069868161f63 |
| children | c7e5b8779bb5 |
| rev | line source |
|---|---|
|
92
3f619ae03678
Improve calcuator example program.
Thinker K.F. Li <thinker@branda.to>
parents:
78
diff
changeset
|
1 #include <stdio.h> |
| 77 | 2 #include <sys/time.h> |
| 3 #ifdef __FreeBSD__ | |
| 4 #include <machine/cpufunc.h> | |
| 5 #include <sys/types.h> | |
| 6 #include <sys/sysctl.h> | |
| 7 #endif | |
| 8 #include "mb_timer.h" | |
| 9 | |
| 10 | |
| 11 #ifdef __FreeBSD__ | |
| 12 void get_now(mb_timeval_t *tmo) { | |
| 13 struct timeval tv; | |
| 14 static uint64_t cpufreq; | |
| 120 | 15 static uint64_t diff; |
| 77 | 16 static mb_timeval_t tm = {0, 0}; |
| 17 static uint64_t last_ts; | |
| 18 mb_timeval_t diff_tm; | |
| 120 | 19 uint64_t ts, udiff, sdiff; |
| 77 | 20 size_t sysctl_sz; |
| 78 | 21 int r; |
| 77 | 22 |
| 23 if(MB_TIMEVAL_SEC(&tm) == 0) { | |
| 24 sysctl_sz = sizeof(uint64_t); | |
| 78 | 25 r = sysctlbyname("kern.timecounter.tc.TSC.frequency", |
| 26 &cpufreq, &sysctl_sz, | |
| 27 NULL, 0); | |
| 28 if(r == -1) { | |
| 29 perror("sysctl"); | |
| 30 return; | |
| 31 } | |
| 77 | 32 |
| 33 gettimeofday(&tv, NULL); | |
| 34 last_ts = rdtsc(); | |
| 35 | |
| 36 MB_TIMEVAL_SET(tmo, tv.tv_sec, tv.tv_usec); | |
| 37 MB_TIMEVAL_CP(&tm, tmo); | |
| 38 diff = 0; | |
| 39 } else { | |
| 40 ts = rdtsc(); | |
| 120 | 41 diff += ts - last_ts; |
| 77 | 42 sdiff = diff / cpufreq; |
| 43 udiff = (diff % cpufreq) * 1000000 / cpufreq; | |
| 44 | |
| 45 MB_TIMEVAL_SET(&diff_tm, sdiff, udiff); | |
| 46 MB_TIMEVAL_CP(tmo, &tm); | |
| 47 MB_TIMEVAL_ADD(tmo, &diff_tm); | |
| 48 | |
| 49 MB_TIMEVAL_SET(&diff_tm, sdiff, 0); | |
| 50 MB_TIMEVAL_ADD(&tm, &diff_tm); | |
| 51 | |
| 120 | 52 diff %= cpufreq; |
| 53 last_ts = ts; | |
| 77 | 54 } |
| 55 } | |
| 56 #else /* __FreeBSD__ */ | |
| 57 void get_now(mb_timeval_t *tmo) { | |
| 58 struct timeval tv; | |
| 59 | |
| 60 gettimeofday(&tv, NULL); | |
| 61 MB_TIMEVAL_SET(tmo, tv.tv_sec, tv.tv_usec); | |
| 62 } | |
| 63 #endif /* __FreeBSD__ */ | |
| 64 |