实用技巧：Linux下时间延迟以及延缓操作

unsigned long timespec_to_jiffies(struct timespec *value);void jiffies_to_timespec(unsigned long jiffies, struct timespec *value);unsigned long timeval_to_jiffies(struct timeval *value);void jiffies_to_timeval(unsigned long jiffies, struct timeval *value);

struct timeval { time_t tv_sec; /* seconds */ suseconds_t tv_usec; /* microseconds */ };struct timespec { long int tv_sec; long int tv_nsec; };

int gettimeofday(struct timeval *tv, struct timezone *tz);