From 96e13851f64b1fc364cc5ee701713706a81fc647 Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Thu, 10 Oct 2024 18:15:02 -0400
Subject: parallelize makeBalls()

---
 balls.cpp | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/balls.cpp b/balls.cpp
index b3f245d..2c4ee6b 100644
--- a/balls.cpp
+++ b/balls.cpp
@@ -136,11 +136,9 @@ vector<Ball *>
 makeBalls(int n) {
 	size_t i;
 
-	vector<Point> positions = noOverlapCircles(n);
-	
 	vector<Ball *> balls(n);
-	/* TODO: parallel */
-	for(i = 0; i < balls.size(); i++) {
+
+	for (i = 0; i < balls.size(); i++) {
 		cout << "Creating ball " << i << "\n";
 		if ((balls[i] = (Ball *) malloc(sizeof(Ball))) == NULL) {
 			cerr << "failed to allocate ball\n";
@@ -148,14 +146,19 @@ makeBalls(int n) {
 				free(balls[i]);
 			exit(1);
 		}
-		
+	}
+
+	vector<Point> positions = noOverlapCircles(n);
+
+	parallel_for(size_t(0), balls.size(), [balls, positions] (size_t i) {
 		balls[i]->p = positions[i];
 		balls[i]->v.x = randDouble(-VMAX_INIT, VMAX_INIT);
 		balls[i]->v.y = randDouble(-VMAX_INIT, VMAX_INIT);
 		balls[i]->r = randDouble(RMIN, RMAX);
 		balls[i]->m = mass(balls[i]->r);
 		balls[i]->color = randColor();
-	};
+	});
+
 	return balls;
 }
 
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