From 91f0f8acd7bb93039252812ab45521b948ff50f4 Mon Sep 17 00:00:00 2001
From: alegrand <alegrand@48e7efb5-ca39-0410-a469-dd3cf9ba447f>
Date: Sat, 20 Nov 2004 00:11:47 +0000
Subject: [PATCH 1/1] Bug fix and add a xbt_swag_foreach_safe where you can
 remove objects from the swag while going through it.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/simgrid/simgrid/trunk@520 48e7efb5-ca39-0410-a469-dd3cf9ba447f
---
 include/xbt/swag.h | 9 +++++++++
 src/xbt/swag.c     | 2 +-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/include/xbt/swag.h b/include/xbt/swag.h
index d4533a0684..5af75a74e6 100644
--- a/include/xbt/swag.h
+++ b/include/xbt/swag.h
@@ -46,3 +46,12 @@ static __inline__ void *xbt_swag_getFirst(xbt_swag_t swag)
    for((obj)=xbt_swag_getFirst((swag));                       \
        (obj)!=NULL;                                           \
        (obj)=xbt_swag_getNext((obj),(swag)->offset))
+
+#define xbt_swag_foreach_safe(obj,obj_next,swag)                  \
+   for((obj)=xbt_swag_getFirst((swag)),                           \
+       ((obj)?(obj_next=xbt_swag_getNext((obj),(swag)->offset)):  \
+	         (obj_next=NULL));                                \
+       (obj)!=NULL;                                               \
+       (obj)=obj_next,                                            \
+       ((obj)?(obj_next=xbt_swag_getNext((obj),(swag)->offset)):  \
+                 (obj_next=NULL))     )
diff --git a/src/xbt/swag.c b/src/xbt/swag.c
index dc09977550..42e70fd10d 100644
--- a/src/xbt/swag.c
+++ b/src/xbt/swag.c
@@ -57,7 +57,7 @@ void *xbt_swag_extract(void *obj, xbt_swag_t swag)
 {
   size_t offset = swag->offset;
 
-  if (!obj)
+  if ((!obj) || (!swag))
     return NULL;
   if(!xbt_swag_belongs(obj, swag)) /* Trying to remove an object that
 				      was not in this swag */
-- 
2.20.1