I need help creating a Preemptive Priority (PP) CPU scheduling algorithm.

This algorithm needs to be created by reading an input.txt file, importing all the data into a linked list, then outputting all data into an output.txt file.

The program will be invoked as follows:

./sched [limit]

is the name of the text file including the information about the processes to be scheduled and it will have the following format:

• is a non-negative integer number given in milliseconds representing the arrival

  time of the process

• is a positive integer number representing the process id of the process

• is a non-negative integer number given in milliseconds representing the arrival

  time of the process

• is a positive integer number indicating the amount of CPU-time that the process

  requires

• is a non-negative integer number indicating the priority of the process. Lower number indicates a higher priority. For example, the following can be a sample input file:

   1 0 4 70 2 4 19 120 3 9 5 100 4 14 3 0 5 16 2 3 6 23 2 20 

Here is more information about the content of the input file:

All three fields are guaranteed to appear in the input file. Processes are sorted by their arrival times in increasing order.

Processes have unique arrival times. Arrival time of the first process is guaranteed to be 0.

[limit] is an optional command-line argument. If this argument is not provided, then you will simulate the whole input file until its end; otherwise, you will only simulate the first [limit] processes. For instance, if limit is given as 10, then you will only simulate the first 10 processes and you program will terminate without simulating the rest of the input file. [limit] is a positive integer less than or equal to the number of lines in the input file.

• is the name of the text file including the result of the simulation. You will receive the name as a command line argument, create the file, and fill its content. Each line of the output file will contain the simulation result of a different process previously provided in the input file and the results will have the following format: