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Welcome to Saad's Five State Process Model simulator!

In a multitasking computer system, processes may occupy a variety of states. These distinct states may not be recognized as such by the operating system kernel. However, they are a useful abstraction for the understanding of processes. The 5 state process model is a basic visualization which handles such processes coming in from the memory, using the following states:

    1-   New: A process has been created but has not yet been admitted to the pool of executable processes.
    2-   Ready: Processes that are prepared to run if given an opportunity. That is, they are not waiting on anything except the CPU availability.
    3-   Running: The process that is currently being executed. (Assume single processor for simplicity.)
    4-   Blocked: A process that cannot execute until a specified event such as an IO completion occurs.
    5-   Exit: A process that has been released by OS either after normal termination or after abnormal termination (error).

    (source: https://cse.buffalo.edu/~bina/cse421/spring00/lec3/tsld008.htm)

This program comes with an integrated terminal called "mard". Mard is loaded with a default command, kill, which can be used to terminate programs running haywire (like the States you'll see soon). You can also use Linux/UNIX system calls by prefixing "system" before them, for example:

ls -l

would become

system ls -l

HOW TO BUILD:

(assuming you've opened a terminal in this folder)

  • cd bin
  • g++ New.cpp -lrt -o New && g++ Ready.cpp -pthread -lrt -o Ready && g++ Running.cpp -lrt -o Running && g++ Blocked.cpp -pthread -lrt -o Blocked && g++ Exit.cpp -lrt -o Exit && g++ kill.cpp -o kill && g++ system.cpp -o system
  • cd ../
  • g++ 5_state_model_simulator.cpp -lrt -pthread -o 5_state_model_simulator

HOW TO RUN:

  • To set which file to open in New, go to around line 27, where a string "fileToOpen" holds the name of the file. By default, it opens "Sample_3_SRTF.txt". You will also have to go to "Exit.cpp", where a variable "StopAt" holds the number of Procedures at which it should stop and print the Report
  • You can change whether or not it sends the data to a log file or the console itself (you'll have to comment a block of code in "5_state_model_simulator.cpp" (lines 227-236)
  • After building, just enter "./5_state_model_simulator" to execute
  • Since the States go in an infinite loop, you can kill them using "kill [pidofprocess]". Multiple pids can be killed with spaces, e.g. "kill [pid1] [pid2] [pid3]"