只是心态,抓住机会。
全部博文(1384)
分类: LINUX
2012-03-13 16:59:11
应用层:
#include
1、unsigned int sleep(unsigned int seconds); 秒级
2、int usleep(useconds_t usec); 微秒级:1/10^-6
#define _POSIX_C_SOURCE 199309
#include
3、int nanosleep(const struct timespec *req, struct timespec *rem);
struct timespec {
time_t tv_sec; /* seconds */
long tv_nsec; /* nanoseconds */ 这个是纳秒啊。
};
// The value of the nanoseconds field must be in the range 0 to 999999999.
内核层:
include
1、void ndelay(unsigned long nsecs); 纳秒级:
2、void udelay(unsigned long usecs); 微秒级: 1/10^-6
3、void mdelay(unsigned long msecs); 毫秒级:1/10^-3