ENES BAŞER - 2020400141

Round-Robin CPU Scheduling in C

Overview

The main.c file contains the main logic for a process scheduling simulation. It reads process data from a file, populates the process instructions, sorts the processes, and then simulates their execution.

Structs

• Process: Holding fields for processes. It would be a good choice to operaitons with fields of corresponding structs.

• Instruction: Instruction has some fields like duration name. And also it is useful to use this structure in Process struct

• enum: Defined for purpose of type of the process wheter they are GOLD,PLATINUM ,SILVER

Key Variables

• procs: An array of Proc structures, each representing a process to be scheduled.

• count: A counter for the number of processes read from the file.

• curr_time: The current time in the simulation.

• turnaround: A variable to hold the turnaround time.

• allFinished: A boolean flag to check if all processes have finished execution.

• test, temp_count, init: Temporary variables used in the simulation loop.

Key Functions

• populateProcessInstructions(&procs[i]): Populates the instructions for the process procs[i].

• qsort(procs, count, sizeof(struct Proc), compareProcs): Sorts the procs array using the compareProcs function.

• compareProcs: A function used to compare two Proc structures (not shown in the provided code).

Program Flow

1. The program reads process data from a file and stores it in the procs array. If more than 10 processes are read, the program only keeps the first 10 and discards the rest.

2. The program populates the instructions for each process.

3. The procs array is sorted to handle scheduling priority . (Refretence to qsort and custom compareTo function)

4. The program enters a simulation loop where it simulates the execution of the processes. It handles types(defined as enum reference to enum ) priorities, preemption , burst time for each of the process structures.

5. At the end of the simulation if all process isFinished then exit loop and print turnaround time and waiting time .

Compile and Run

• make

• ./scheduler

• Test with different input changing to input file as defX.txt .