Author :
cheloha
Date :
2020-01-12 00:01:12
Hash :ce07d858 Message :*sleep_nsec(9): sleep *at least* the given number of nanoseconds
The *sleep(9) interfaces are challenging to use when one needs to sleep
for a given minimum duration: the programmer needs to account for both
the current tick and any integer division when converting an interval
to a count of ticks. This sort of input conversion is complicated and
ugly at best and error-prone at worst.
This patch consolidates this conversion logic into the *sleep_nsec(9)
functions themselves. This will allow us to use the functions at the
syscall layer and elsewhere in the kernel where guaranteeing a minimum
sleep duration is of vital importance.
With input from bluhm@, guenther@, ratchov@, tedu@, and kettenis@.
Requested by mpi@ and kettenis@.
Conversion algorithm from mpi@.
ok mpi@, kettenis@, deraadt@
cheloha