From 14a9171cffd8a2a675e07b90b519c67da35326d6 Mon Sep 17 00:00:00 2001
From: Jack Jansen <jack.jansen@cwi.nl>
Date: Fri, 25 Aug 2000 21:57:23 +0000
Subject: Cheaper implementation of PyOS_CheckStack: only call StackSpace once
 and keep a sentinel in a static variable.

---
 Mac/Python/macglue.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/Mac/Python/macglue.c b/Mac/Python/macglue.c
index 8b3d6e1..240fc01 100644
--- a/Mac/Python/macglue.c
+++ b/Mac/Python/macglue.c
@@ -410,10 +410,13 @@ PyMac_Error(OSErr err)
 int
 PyOS_CheckStack()
 {
-	long left;
+	char here;
+	static char *sentinel = 0;
 	
-	left = StackSpace();
-	if ( left < MINIMUM_STACK_SIZE )
+	if ( sentinel == 0 ) {		
+		sentinel = &here - StackSpace() + MINIMUM_STACK_SIZE;
+	}
+	if ( &here < sentinel )
 		return -1;
 	return 0;
 }
-- 
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