Unix Shell & Dental Clinic Simulation

This repository contains two main directories, each containing different system implementations:

Sem_ Directory #

The Sem_ directory contains a multithreaded dental clinic simulation implemented in C using POSIX threads and semaphores.

Project Description #

A simulation of a dental clinic with:

• 3 hygienist threads
• N patient threads (N > 3)
• 4 standing spaces
• 1 sofa
• 3 treatment chairs

System Components #

• ex3.c: The main implementation file containing:
  • Patient and hygienist thread implementations
  • Semaphore management for synchronization
  • Resource management (sofa, chairs, standing spaces)
  • Payment processing system
• ex3.out: Compiled output of the simulation
• מערכות הפעלה.docx: Documentation including:
  • Team member information
  • Program output screenshots
  • Implementation details

Key Features #

• Thread synchronization using POSIX threads and semaphores
• Resource management for clinic capacity
• Queue management for patient waiting
• Payment processing system
• Real-time status updates

UNIX Directory #

The UNIX directory contains a Linux-based shell system implementing a loan request platform using low-level system calls.

Project Description #

A shell-based loan management system with two modes:

• MainShell: For normal users
• ManagerShell: For administrative functions

System Components #

MainShell Features #

• Main_shell.c: Primary user interface
• GetLoan.c: Create new loan requests
• CheckStatus.c: View request status
• ApproveLoan.c: Final approval processing
• LoginM.c: Manager authentication
• exit.c: Session termination

ManagerShell Features #

• Manager_shell.c: Administrative interface
• ShowReqNum.c: Total request statistics
• ShowAReqNum.c: Approved request count
• ShowUnReqNum.c: Rejected request count
• CheckRequestList.c: Pending request management
• ShowReqDetails.c: Detailed request information
• ShowCriteria.c: Credit rating criteria display
• UpdateCriteria.c: Criteria management
• ApproveReqLoan.c: Request approval processing
• UnApprovedReqLoan.c: Request rejection
• LogOut.c: Manager session termination

System Structure #

• Directories:
  • Loan/Request/
  • Loan/Result/Approved/
  • Loan/Result/UnApproved/
• Files:
  • User.txt
  • Criteria.txt
  • Manager_pass.txt
  • Individual request files (<ID>.txt)

Technical Requirements #

• Uses only low-level system calls (open, read, write)
• No system, fork, or exec calls
• Shell script (Sys_shell.sh) for compilation and execution

Getting Started #

For Sem_ Project: #

1. Compile the program using a C compiler with POSIX thread support
2. Run the executable to start the simulation
3. Use Ctrl+C to terminate the simulation

For UNIX Project: #

1. Run Sys_shell.sh to compile and start the system
2. Use MainShell for regular user operations
3. Use ManagerShell for administrative functions

Requirements #

• C compiler with POSIX thread support (for Sem_)
• Linux/Unix environment
• Word document viewer (for documentation)
• Shell environment (for UNIX project)