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   2¡¢int usleep(useconds_t usec);              ΢Ãë¼¶£º1/10^-6 
 
   #define _POSIX_C_SOURCE 199309
   #include <a(const struct timespec *req, struct timespec *rem);
       struct timespec {
                  time_t tv_sec;        /* seconds */
                  long   tv_nsec;       /* nanoseconds */
              };
       // The value of the nanoseconds field must be in the range 0 to 999999999.
 
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   2¡¢void udelay(unsigned long usecs);         ΢Ãë¼¶: 1/10^-6
   3¡¢void mdelay(unsigned long msecs);         ºÁÃë¼¶£º1/10^-3
 
 
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