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 8b3d6e1..240fc01 100644
--- a/Mac/Python/macglue.c
+++ b/Mac/Python/macglue.c
@@ -410,10 +410,13 @@
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;
}