clock.c (350B)
1 #include "clock.h" 2 3 extern int _getrusage(int, struct rusage*); 4 5 static clock_t 6 convtick(struct rusage r) 7 { 8 return r.ru_utime.tv_sec*CLOCKS_PER_SEC + 9 r.ru_stime.tv_usec / (1000000 / CLOCKS_PER_SEC); 10 } 11 12 13 clock_t 14 clock(void) 15 { 16 struct rusage ru; 17 clock_t c; 18 19 if (_getrusage(RUSAGE_SELF, &ru)) 20 return ((clock_t) -1); 21 return convtick(ru); 22 }