From 4d5928fcc07f1943cec6e12217a4fdd02b0c9ae9 Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Sat, 30 Nov 2019 19:45:43 +0100
Subject: [PATCH] fixed a potential crash caused by reentrant hybrid::link

---
 nonisotropic.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/nonisotropic.cpp b/nonisotropic.cpp
index 497a5c73..ec5c761a 100644
--- a/nonisotropic.cpp
+++ b/nonisotropic.cpp
@@ -1216,7 +1216,11 @@ EX namespace hybrid {
   
   EX void will_link(cell *c) { if(pmap && ((hrmap_hybrid*) pmap)->twisted) to_link.push_back(c); }
   
+  EX bool in_link = false;
+  
   EX void link() {
+    if(in_link) return;
+    dynamicval<bool> b(in_link, true);
     auto pm = (hrmap_hybrid*) pmap;
     if(!pm) return;
     auto& ss = pm->spins;