From fdc783b87c0bdab652bbe096adab165fe125ccc8 Mon Sep 17 00:00:00 2001
From: Joe <Joe>
Date: Fri, 17 Oct 2025 17:14:48 -0700
Subject: [PATCH] multithread the creation of the index

---
 src/lib.rs | 34 ++++++++++++++++++++++------------
 1 file changed, 22 insertions(+), 12 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 2f34658..d77eaef 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -65,22 +65,32 @@ pub struct Spindex2d {
 impl Spindex2d {
     pub fn new(points: &[Point2d]) -> Self {
         let mut xpoints = Vec::with_capacity(points.len());
-        let mut ypoints = Vec::with_capacity(points.len());
         let mut xs = Vec::with_capacity(points.len());
-        let mut ys = Vec::with_capacity(points.len());
-        for (i, point) in points.iter().enumerate() {
-            let x = PVal::new(i, point.x);
-            xs.push(x);
-            let y = PVal::new(i, point.y);
-            ys.push(y);
 
-            xpoints.push(i);
-            ypoints.push(i);
-        }
+        let mut ypoints = Vec::with_capacity(points.len());
+        let mut ys = Vec::with_capacity(points.len());
+
+        thread::scope(|s| {
+            s.spawn(|| {
+                for (i, point) in points.iter().enumerate() {
+                    let x = PVal::new(i, point.x);
+                    xs.push(x);
+                    xpoints.push(i);
+                }
+            });
+
+            s.spawn(|| {
+                for (i, point) in points.iter().enumerate() {
+                    let y = PVal::new(i, point.y);
+                    ys.push(y);
+                    ypoints.push(i);
+                }
+            });
+        });
 
         let index = Self {
-            xpoints: Arc::new(xpoints.into()),
-            ypoints: Arc::new(ypoints.into()),
+            xpoints: Arc::new(RwLock::new(xpoints)),
+            ypoints: Arc::new(RwLock::new(ypoints)),
             xs: Arc::new(RwLock::new(xs)),
             ys: Arc::new(RwLock::new(ys)),
         };