A process and resource manager program written in python language. It is a basic manager with extended functionalities which includes process with different priorities, scheduling according to the priority and resources having multiple identical units. It has 6 main operations - create, destory, request, release, timeout and scheduler; and some helper functions to make the code readable and presentable.
There is a input.txt file from where the program reads the commands line by line and prints the output to output.txt file.
- The input.txt, project1.py should be in the same directory.
- To run the program:
- Make sure that the current directory is the same as the directory of input.txt and project1.py
- Enter the command python project1.py in the terminal [if the current python version is set to 3] otherwise use python3 project1.py
- After the command is entered, output.txt file is generated automatically and saved in the same directory as input.txt and project1.py
- Make sure that the current directory is the same as the directory of input.txt and project1.py
- The output.txt file contains the output of the program
CREATE
- create_init() : Initializes: PCB[16], RCB[4] and Ready List RL with priority levels. It also creates PCB[0] (with priority = 0)
- create(p) : Creates a new process with priority 'p'
DESTROY
- destroy(j) : Destroys the process j if it exists along with its children and grandchildren (if any)
- check_destroy(j)[Helper function of destroy()] : It checks if j is current running process or is one of the decendents of current running process and then calls the destroy function
- print_destroy_count()[Helper function of destroy()] : Outputs the total number of processes destroyed
- remove_parent()[Helper function of destroy()] : Remove j from the children list of its parent process when destroy is called
REQUEST
- request(r,k) : Request k units of r resource
RELEASE
- release(r,k) : Releases k units of resource r
TIMEOUT
- timeout() : Moves the current process to the end of the reading list and call the scheduler
SCHEDULER
- scheduler() : To perform context switch and schedule according to the priority
MANAGE INPUT AND OUTPUT
- write_in_file() : Writes the output in the output file
- menu() : Calls the appropriate function according to the command in the input file
VAANYA GUPTA