From: Jack Jansen <jack.jansen@cwi.nl>
Date: Fri, 25 Aug 2000 21:57:23 +0000 (+0000)
Subject: Cheaper implementation of PyOS_CheckStack: only call StackSpace once and keep a senti... 
X-Git-Tag: v2.0b1~234
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=14a9171cffd8a2a675e07b90b519c67da35326d6;p=thirdparty%2FPython%2Fcpython.git

Cheaper implementation of PyOS_CheckStack: only call StackSpace once and keep a sentinel in a static variable.
---

diff --git a/Mac/Python/macglue.c b/Mac/Python/macglue.c
index 8b3d6e139c6c..240fc0157a96 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;
 }