Updated to have use a thread-safe vector. (a735b04a) · Commits · Configs / EC327 / Homeworks / Homework Six

GUI/ThreadSafeVector.h

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		//
		// Created by Ari Trachtenberg on 11/8/24.
		//

		#ifndef HW6_THREADSAFEVECTOR_H
		#define HW6_THREADSAFEVECTOR_H
		#include <vector>
		#include <shared_mutex>
		#include <mutex>
		#include <stdexcept>

		// A thread-safe vector, based on a ChatGPT response
		template <typename T>
		class ThreadSafeVector {
		private:
		std::vector<T> vec;
		mutable std::shared_mutex mtx; // `mutable` allows locking in const methods.

		public:
		// Pushes an element to the back of the vector (exclusive lock for modification).
		void push_back(const T& value) {
		std::unique_lock<std::shared_mutex> lock(mtx);
		vec.push_back(value);
		}

		// Returns the size of the vector (shared lock for read access).
		size_t size() const {
		std::shared_lock<std::shared_mutex> lock(mtx);
		return vec.size();
		}

		// Accesses an element by index with bounds checking (shared lock for read access).
		T operator[](size_t index) const {
		std::shared_lock<std::shared_mutex> lock(mtx);
		return vec[index];
		}

		// Provides a thread-safe way to begin and end iterators (copy for safe iteration).
		std::vector<T> get_copy() const {
		std::shared_lock<std::shared_mutex> lock(mtx);
		return vec; // Returns a copy of the vector.
		}
		};

		#endif //HW6_THREADSAFEVECTOR_H

+1 −1

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		@@ -26,7 +26,7 @@ void draw::Window::_drawShapes() {
		}

		// draw shapes
		for (Shape *theShape: shapeList) {
		for (Shape *theShape: shapeList.get_copy()) {
		theShape->onInput(userInput);
		theShape->draw();
		}

+2 −1

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		@@ -18,6 +18,7 @@
		#include "../Shapes/Shape.h"
		#include "../Shapes/Rect/Rect.h"
		#include "../Shapes/AllDoneSensor.h"
		#include "ThreadSafeVector.h"

		using namespace std;

		@@ -146,7 +147,7 @@ namespace draw {
		/**
		* A list of the shapes that are displayed on this Window.
		*/
		vector<Shape *> shapeList;
		ThreadSafeVector<Shape *> shapeList;

		/**
		* The Thread used for drawing shapes.