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 */
12 #include "xbt/sysdep.h"
13 #include "xbt/error.h"
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 = xbt_new0(s_xbt_swag_t, 1);
27 swag->offset = offset;
32 void xbt_swag_init(xbt_swag_t swag, size_t offset)
34 swag->offset = offset;
37 void xbt_swag_insert(void *obj, xbt_swag_t swag)
40 if (xbt_swag_belongs(obj, swag))
44 if (swag->head == NULL) {
50 PREV(obj, swag->offset) = swag->tail;
51 NEXT(PREV(obj, swag->offset), swag->offset) = obj;
56 void *xbt_swag_remove(void *obj, xbt_swag_t swag)
58 size_t offset = swag->offset;
60 if ((!obj) || (!swag))
62 if(!xbt_swag_belongs(obj, swag)) /* Trying to remove an object that
63 was not in this swag */
66 if (swag->head == swag->tail) { /* special case */
67 if (swag->head != obj) /* Trying to remove an object that was not in this swag */
71 } else if (obj == swag->head) { /* It's the head */
72 swag->head = NEXT(obj, offset);
73 PREV(swag->head, offset) = NULL;
74 NEXT(obj, offset) = NULL;
75 } else if (obj == swag->tail) { /* It's the tail */
76 swag->tail = PREV(obj, offset);
77 NEXT(swag->tail, offset) = NULL;
78 PREV(obj, offset) = NULL;
79 } else { /* It's in the middle */
80 NEXT(PREV(obj, offset), offset) = NEXT(obj, offset);
81 PREV(NEXT(obj, offset), offset) = PREV(obj, offset);
82 PREV(obj, offset) = NEXT(obj, offset) = NULL;
88 void *xbt_swag_extract(xbt_swag_t swag)
90 size_t offset = swag->offset;
93 if ((!swag) || (!(swag->head)))
98 if (swag->head == swag->tail) { /* special case */
99 swag->head = swag->tail = NULL;
101 swag->head = NEXT(obj, offset);
102 PREV(swag->head, offset) = NULL;
103 NEXT(obj, offset) = NULL;
109 int xbt_swag_size(xbt_swag_t swag)
111 return (swag->count);
114 int xbt_swag_belongs(void *obj, xbt_swag_t swag)
116 return ((NEXT(obj, swag->offset)) || (PREV(obj, swag->offset))
117 || (swag->head == obj));