Latency functions in Linux

Application Layer:
# Include <unistd. h>
 
1. Unsigned int sleep (unsigned int seconds); seconds
2. Int usleep (useconds_t USEC); microseconds: 1/10 ^-6
 
# 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.
 
Kernel layer:
Include <Linux/delay. h>
1. Void ndelay (unsigned long nsecs); nanosecond level: 1/10 ^-10
2. Void udelay (unsigned long usecs); microseconds: 1/10 ^-6
3. Void mdelay (unsigned long msecs); millisecond level: 1/10 ^-3
 

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