So many computer activities that based on timing measurements, examples of such kind of activities
are the computer display will be turned off if you have not Plastiki, what moved your mouse for a particular
time?
So next time, timing substance, it mainly handles two types of timing activities.
First one is keeping the current time and date.
So this is no used by time.
Some calls like Time get time off B and clock.
And this could news is we have seen this in our last session then from entering the timestamps for files
and network packets.
So these are current time and it is needed for timestamps.
And for other purposes, and we also need to calculate the elapsed time, which we have done in the
previous session using clock and time and the second type of planning activities, maintaining timelines.
So mechanisms to notify Kunal and userspace in userspace, we already have seen alarm system call that
a certain level of time has been elapsed.
So it's an alarm system.
One sends a signal that we have seen some progress.
We also have gotten old timers will be looking to next excisions.
So these are the two types of activities.
One is to keep the current time and date.
On another one is maintaining timeless, although it also includes the uptime and on.
So hardware devices.
Next depends on how to verify this to in time.
So these devices, they can be basically classified into two types.
First one is we can call it a clock or we can call it a second.
So this kind of devices, they provide precise time measurement and these are used for keeping track
of current time of the.
Then we have one more kind of device which is timeless, so timeless, it issues contracts at fixed
predefined frequency and these are used for implementing software downloads like a lot of old timers.
So Linux mainly depends on two kinds of hardware devices, control clock, which is used for maintaining
the time, current time of day, and the other one is used for implementing software downloads, spammers,
the issuing drops at fixed predefined frequency.