3 /* Copyright (c) 2004 Arnaud Legrand. All rights reserved. */
5 /* This program is free software; you can redistribute it and/or modify it
6 * under the terms of the license (GNU LGPL) which comes with this package. */
8 /* Warning, this module is done to be efficient and performs tons of
9 cast and dirty things. So avoid using it unless you really know
10 what you are doing. */
12 /* This type should be added to a type that is to be used in such a swag */
14 #include "xbt/sysdep.h"
15 #include "xbt/error.h"
18 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(swag,xbt,"Swag : O(1) set library");
20 #define PREV(obj,offset) xbt_swag_getPrev(obj,offset)
21 #define NEXT(obj,offset) xbt_swag_getNext(obj,offset)
24 Usage : xbt_swag_new(&obj.setA-&obj);
27 xbt_swag_t xbt_swag_new(size_t offset)
29 xbt_swag_t swag = xbt_new0(s_xbt_swag_t, 1);
31 swag->offset = offset;
37 void xbt_swag_free(xbt_swag_t swag)
42 void xbt_swag_init(xbt_swag_t swag, size_t offset)
44 swag->offset = offset;
47 void xbt_swag_insert(void *obj, xbt_swag_t swag)
50 if (xbt_swag_belongs(obj, swag))
54 if (swag->head == NULL) {
60 PREV(obj, swag->offset) = swag->tail;
61 NEXT(PREV(obj, swag->offset), swag->offset) = obj;
66 void *xbt_swag_remove(void *obj, xbt_swag_t swag)
68 size_t offset = swag->offset;
70 if ((!obj) || (!swag))
72 if(!xbt_swag_belongs(obj, swag)) /* Trying to remove an object that
73 was not in this swag */
76 if (swag->head == swag->tail) { /* special case */
77 if (swag->head != obj) /* Trying to remove an object that was not in this swag */
81 } else if (obj == swag->head) { /* It's the head */
82 swag->head = NEXT(obj, offset);
83 PREV(swag->head, offset) = NULL;
84 NEXT(obj, offset) = NULL;
85 } else if (obj == swag->tail) { /* It's the tail */
86 swag->tail = PREV(obj, offset);
87 NEXT(swag->tail, offset) = NULL;
88 PREV(obj, offset) = NULL;
89 } else { /* It's in the middle */
90 NEXT(PREV(obj, offset), offset) = NEXT(obj, offset);
91 PREV(NEXT(obj, offset), offset) = PREV(obj, offset);
92 PREV(obj, offset) = NEXT(obj, offset) = NULL;
98 void *xbt_swag_extract(xbt_swag_t swag)
100 size_t offset = swag->offset;
103 if ((!swag) || (!(swag->head)))
108 if (swag->head == swag->tail) { /* special case */
109 swag->head = swag->tail = NULL;
111 swag->head = NEXT(obj, offset);
112 PREV(swag->head, offset) = NULL;
113 NEXT(obj, offset) = NULL;
119 int xbt_swag_size(xbt_swag_t swag)
121 return (swag->count);
124 int xbt_swag_belongs(void *obj, xbt_swag_t swag)
126 return ((NEXT(obj, swag->offset)) || (PREV(obj, swag->offset))
127 || (swag->head == obj));