From a3e4fbf6aa8e3709f3001ca918f78f2bf2bb4185 Mon Sep 17 00:00:00 2001
From: Andrew Kane <andrew@ankane.org>
Date: Fri, 19 Jan 2024 13:44:25 -0800
Subject: [PATCH] Use shared lock for copying neighbors to local memory

---
 src/hnswutils.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/hnswutils.c b/src/hnswutils.c
index b9d722a..6521377 100644
--- a/src/hnswutils.c
+++ b/src/hnswutils.c
@@ -781,7 +781,7 @@ HnswSearchLayer(char *base, Datum q, List *ep, int ef, int lc, Relation index, F
 		/* Copy neighborhood to local memory if needed */
 		if (index == NULL)
 		{
-			LWLockAcquire(&cElement->lock, LW_EXCLUSIVE);
+			LWLockAcquire(&cElement->lock, LW_SHARED);
 			memcpy(neighborhoodData, neighborhood, neighborhoodSize);
 			LWLockRelease(&cElement->lock);
 			neighborhood = neighborhoodData;