4 extern unsigned long utime_since(struct timeval *, struct timeval *);
5 extern unsigned long mtime_since(struct timeval *, struct timeval *);
6 extern unsigned long mtime_since_now(struct timeval *);
7 extern unsigned long time_since_now(struct timeval *);
8 extern void usec_sleep(struct thread_data *, unsigned long);
10 extern void rate_throttle(struct thread_data *, unsigned long, unsigned int);