From 710a271ccb135655be96fd121dd9d42dd9c11fd9 Mon Sep 17 00:00:00 2001
From: cacao <none@none>
Date: Sun, 13 Dec 1998 20:33:44 +0000
Subject: [PATCH] threading bugs fixed

---
 mm/heap2.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mm/heap2.c b/mm/heap2.c
index abd4120d5..10ed06bf4 100644
--- a/mm/heap2.c
+++ b/mm/heap2.c
@@ -905,11 +905,15 @@ void
 gc_call (void)
 {
 #ifdef USE_THREADS
+	u1 dummy;
+
 	assert(blockInts == 0);
 
 	intsDisable();
-	if (currentThread == NULL || currentThread == mainThread)
+	if (currentThread == NULL || currentThread == mainThread) {
+		CONTEXT(mainThread).usedStackTop = &dummy;
 		gc_run();
+		}
 	else
 		asm_switchstackandcall(CONTEXT(mainThread).usedStackTop, gc_run,
 							   (void**)&(CONTEXT(currentThread).usedStackTop));
-- 
2.25.1