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Python Threading: Producer-Consumer Demo

This project is a simple Python script that demonstrates advanced, low-level threading synchronization using threading.Condition.

It solves the classic "Producer-Consumer" problem:

  1. 5 Consumer Threads (waiter) start first. They want to get a password from a shared list, but the list is empty. They go to sleep and wait() for a signal.
  2. 1 Producer Thread (the main thread) then asks the user for a password (it "produces" data).
  3. After getting a password, it adds it to the shared list and sends a notify() signal.
  4. This signal wakes up one of the sleeping threads, which can now safely "consume" the password from the list before going back to sleep.

Skills Demonstrated

This script is a technical demonstration of advanced computer science concepts:

  • Multithreading: Running multiple threads of execution concurrently.
  • Synchronization: Using a threading.Condition object to prevent a "race condition" (where multiple threads might try to access the empty list at the same time).
  • Signaling: Using cond.wait() to pause threads and cond.notify() to wake them up efficiently, ensuring the program doesn't waste CPU cycles.
  • Resource Locking: The cond.acquire() and cond.release() (which are part of the Condition object) ensure that only one thread can modify the shared list at any given moment.

How to Run

  1. Download the main.py file.
  2. Run it using Python 3:
python3 main.py

The program will immediately start 5 "waiter" threads (which will go to sleep) and then prompt you for a password. Each time you enter a password and press Enter, one of the waiting threads will wake up and print it.