Get_Block_Implementation

Command Line Linux Shell for simulation of allocating disk blocks function of Operating System

Description :

• Language - C++
• Approach - Multithreading
• IDE - Visual Studio Code

Commands :

• echo-------Printing HashQueue, FreeList and ProcessList
• process----Creating process
• clear------Clear the screen
• help-------Open the help section

echo :

It take only one parameter.

• hashqueue for printing HashQueue
• freelist for printing FreeList
• processlist for printing ProcessList

process - Create processes :

It takes any number of parameter as a file name

• for each file name a new process is being created

Running the Program :

• Open terminal/Command prompt and change directory to the folder of the project ( BufferCache ).
• *Linux – Type
  make
• *Windows – Check out GnuWin's make, which provides a native port for Windows (without requiring a full runtime environment like Cygwin).
• Type – make clean
  for removing compiled files of header files.
• run - ./bufferCache

---

• This command invokes main.cpp file and create a shell of bufferCache.
• main.cpp initializes the buffers in the freelist.
• You can check by using - echo hashqueue and echo freelist command that block is added to the both hashqueue and freelist.
• Use process command for creating new processes. This creates threads as the number of filename given which runs independently in the background until block is allocated. e.g process input1.txt input2.txt input3.txt for each filename a new thread is being created.
• run echo processlist command to check that process is added to the processlist and it displays the process ID provided by the OS.
• If requested block is unlocked and present in freelist then it is allocated to that process after that particular thread process terminates and removed from the processlist.
• But if block is marked as delayed write, then a 20 seconds simulated asynchronous write has been done and after that block is available to allocate.
• use help command for further help.