1 /* Authors: Arnaud Legrand */
3 /* This program is free software; you can redistribute it and/or modify it
4 under the terms of the license (GNU LGPL) which comes with this package. */
6 /* Warning, this module is done to be efficient and performs tons of
7 cast and dirty things. So avoid using it unless you really know
10 /* This type should be added to a type that is to be used in such a swag */
16 #define PREV(obj,offset) xbt_swag_getPrev(obj,offset)
17 #define NEXT(obj,offset) xbt_swag_getNext(obj,offset)
20 Usage : xbt_swag_new(&obj.setA-&obj.setA);
23 xbt_swag_t xbt_swag_new(size_t offset)
25 xbt_swag_t swag = calloc(1, sizeof(s_xbt_swag_t));
27 swag->offset = offset;
32 void xbt_swag_insert(void *obj, xbt_swag_t swag)
35 if (swag->head == NULL) {
41 PREV(obj, swag->offset) = swag->tail;
42 NEXT(PREV(obj, swag->offset), swag->offset) = obj;
44 /* new->prev = l->tail; */
45 /* new->prev->next = new; */
50 void xbt_swag_extract(void *obj, xbt_swag_t swag)
52 size_t offset = swag->offset;
54 if (swag->head == swag->tail) { /* special case */
55 if (swag->head != obj) {
57 "Tried to remove an object that was not in this swag\n");
66 if (obj == swag->head) { /* It's the head */
67 swag->head = NEXT(obj, offset);
68 PREV(swag->head, offset) = NULL;
69 NEXT(obj, offset) = NULL;
70 } else if (obj == swag->tail) { /* It's the tail */
71 swag->tail = PREV(obj, offset);
72 NEXT(swag->tail, offset) = NULL;
73 PREV(obj, offset) = NULL;
74 } else { /* It's in the middle */
75 NEXT(PREV(obj, offset), offset) = NEXT(obj, offset);
76 PREV(NEXT(obj, offset), offset) = PREV(obj, offset);
77 PREV(obj, offset) = NEXT(obj, offset) = NULL;
82 int xbt_swag_size(xbt_swag_t swag)
87 int xbt_swag_belongs(void *obj, xbt_swag_t swag)
89 return ((NEXT(obj, swag->offset)) || (PREV(obj, swag->offset)) || (swag->head==obj));