1 /* Copyright (c) 2004, 2005, 2006, 2007, 2008, 2009, 2010. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
7 /* Warning, this module is done to be efficient and performs tons of
8 cast and dirty things. So avoid using it unless you really know
11 /* This type should be added to a type that is to be used in such a swag */
13 #include "xbt/sysdep.h"
18 /** Creates a new swag.
19 * \param offset where the hookup is located in the structure
20 * \see xbt_swag_offset
22 * Usage : xbt_swag_new(&obj.setA-&obj);
24 XBT_INLINE xbt_swag_t xbt_swag_new(size_t offset)
26 xbt_swag_t swag = xbt_new0(s_xbt_swag_t, 1);
28 xbt_swag_init(swag, offset);
34 * \param swag poor victim
36 * kilkil a swag but not it's content. If you do not understand why
37 * xbt_swag_free should not free its content, don't use swags.
39 XBT_INLINE void xbt_swag_free(xbt_swag_t swag)
44 /** Creates a new swag.
45 * \param swag the swag to initialize
46 * \param offset where the hookup is located in the structure
47 * \see xbt_swag_offset
49 * Usage : xbt_swag_init(swag,&obj.setA-&obj);
51 XBT_INLINE void xbt_swag_init(xbt_swag_t swag, size_t offset)
55 swag->offset = offset;
60 * \param obj the objet to insert in the swag
63 * insert (at the head... you probably had a very good reason to do
64 * that, I hope you know what you're doing) \a obj in \a swag
66 XBT_INLINE void xbt_swag_insert_at_head(void *obj, xbt_swag_t swag)
69 xbt_assert(!(swag->tail), "Inconsistent swag.");
74 else if (obj != swag->head && !xbt_swag_getPrev(obj, swag->offset)) {
75 xbt_swag_getNext(obj, swag->offset) = swag->head;
76 xbt_swag_getPrev(swag->head, swag->offset) = obj;
83 * \param obj the objet to insert in the swag
86 * insert (at the tail... you probably had a very good reason to do
87 * that, I hope you know what you're doing) \a obj in \a swag
89 XBT_INLINE void xbt_swag_insert_at_tail(void *obj, xbt_swag_t swag)
91 if (xbt_swag_belongs(obj, swag)) {
96 xbt_assert(!(swag->head), "Inconsistent swag.");
101 else if (obj != swag->tail && !xbt_swag_getNext(obj, swag->offset)) {
102 xbt_swag_getPrev(obj, swag->offset) = swag->tail;
103 xbt_swag_getNext(swag->tail, swag->offset) = obj;
110 * \param obj the objet to remove from the swag
112 * \return \a obj if it was in the \a swag and NULL otherwise
114 * removes \a obj from \a swag
116 XBT_INLINE void *xbt_swag_remove(void *obj, xbt_swag_t swag)
121 size_t offset = swag->offset;
122 void* prev = xbt_swag_getPrev(obj, offset);
123 void* next = xbt_swag_getNext(obj, offset);
126 xbt_swag_getNext(prev, offset) = next;
127 xbt_swag_getPrev(obj, offset) = NULL;
129 xbt_swag_getPrev(next, offset) = prev;
130 xbt_swag_getNext(obj, offset) = NULL;
138 xbt_swag_getPrev(next, offset) = NULL;
139 xbt_swag_getNext(obj, offset) = NULL;
143 else if (obj == swag->head) {
144 swag->head = swag->tail = NULL;
153 * \return an object from the \a swag
155 void *xbt_swag_extract(xbt_swag_t swag)
160 size_t offset = swag->offset;
161 void* obj = swag->head;
163 if (obj == swag->tail) { /* special case */
164 swag->head = swag->tail = NULL;
166 swag->head = xbt_swag_getNext(obj, offset);
167 xbt_swag_getPrev(swag->head, offset) = NULL;
168 xbt_swag_getNext(obj, offset) = NULL;
177 * \return the number of objects in \a swag
179 XBT_INLINE int xbt_swag_size(xbt_swag_t swag)
181 return (swag->count);
187 XBT_TEST_SUITE("swag", "Swag data container");
190 s_xbt_swag_hookup_t setA;
191 s_xbt_swag_hookup_t setB;
193 } shmurtz, s_shmurtz_t, *shmurtz_t;
196 XBT_TEST_UNIT("basic", test_swag_basic, "Basic usage")
198 shmurtz_t obj1, obj2, obj;
199 xbt_swag_t setA, setB;
201 obj1 = xbt_new0(s_shmurtz_t, 1);
202 obj2 = xbt_new0(s_shmurtz_t, 1);
204 obj1->name = "Obj 1";
205 obj2->name = "Obj 2";
207 xbt_test_add("Basic usage");
208 xbt_test_log("%p %p %ld\n", obj1, &(obj1->setB),
209 (long) ((char *) &(obj1->setB) - (char *) obj1));
211 setA = xbt_swag_new(xbt_swag_offset(*obj1, setA));
212 setB = xbt_swag_new(xbt_swag_offset(*obj1, setB));
214 xbt_swag_insert(obj1, setA);
215 xbt_swag_insert(obj1, setB);
216 xbt_swag_insert(obj2, setA);
217 xbt_swag_insert(obj2, setB);
219 xbt_swag_remove(obj1, setB);
220 /* xbt_swag_remove(obj2, setB); */
222 xbt_test_add("Traverse set A");
223 xbt_swag_foreach(obj, setA) {
224 xbt_test_log("Saw: %s", obj->name);
227 xbt_test_add("Traverse set B");
228 xbt_swag_foreach(obj, setB) {
229 xbt_test_log("Saw: %s", obj->name);
232 xbt_test_add("Ensure set content and length");
233 xbt_test_assert(xbt_swag_belongs(obj1, setA));
234 xbt_test_assert(xbt_swag_belongs(obj2, setA));
236 xbt_test_assert(!xbt_swag_belongs(obj1, setB));
237 xbt_test_assert(xbt_swag_belongs(obj2, setB));
239 xbt_test_assert(xbt_swag_size(setA) == 2);
240 xbt_test_assert(xbt_swag_size(setB) == 1);
249 #endif /* SIMGRID_TEST */