Add process scheduling

[1337M0nst3r]

Resolves Issue #242

Description

Implemented round robin process scheduling algorithm

Technical Specifications

Made in C++

Screenshots (if required)

How to run

Open systems/os/process_scheduling/rr/c++/rr.cpp in any C++ IDE and press build & run OR open a terminal go to systems/process_scheduling/rr/c++/ and type: g++ rr.cpp && ./a.out then press enter

Checklist

• [x ] Code compiles correctly.
• [x ] Changes are tested properly.
• [x ] Followed the Contributing guidelines.

[Ram-Aditya]

@1337M0nst3r Are you sure you have implemented the algorithm correctly? Consider your first example.

• Many processes do not have the schedule times.
• Why does Process 0 have a waiting time of 32microseconds? Let the time start from 0microseconds. Now, what is actually supposed to happen for process 0 is as follows: Process 0 arrives at time 0microseconds and is given access to CPU. Thus it is first scheduled at time 0microseconds. It executed on CPU for a time quantum of 2 microseconds. Now the time is 2 microseconds. No other process has arrived yet. Thus process 0 is given access to CPU again and executed on the CPU for 1microsecond and terminates. This is because the cumulative time it has executed on the CPU is 3 microseconds which is equal to its burst time. Thus its waiting time is 0 microseconds. and schedule times are 0 and 2 microseconds as it was scheduled the first time at 0 microseconds and then again at 2 microseconds.

These are a few of the many issues with the implementation. Kindly recheck your implementation and feel free to clear any confusions/misinterpretations that may have been the cause of the issues.

[1337M0nst3r]

I can fix the schedule times problem but you said to initialize the processes's arrival time with random values between 0 and 50s what's their purpose?

[1337M0nst3r]

Nevermind I got it, now what should I do? Create another pull request?

[Ram-Aditya]

@1337M0nst3r Yes, please create a new PR.