應用層:
#include <unistd.h>
1、unsigned int sleep(unsigned int seconds); 秒級
2、int usleep(useconds_t usec); 微秒級:1/10^-6
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#define _POSIX_C_SOURCE 199309
#include <time.h>
3、int nanosleep(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.
內核層:
include <linux/delay.h>
1、void ndelay(unsigned long nsecs); 納秒級:1/10^-10
2、void udelay(unsigned long usecs); 微秒級: 1/10^-6
3、void mdelay(unsigned long msecs); 毫秒級:1/10^-3