*
* Usage : xbt_swag_init(swag,&obj.setA-&obj);
*/
-void xbt_swag_init(xbt_swag_t swag, size_t offset)
+XBT_INLINE void xbt_swag_init(xbt_swag_t swag, size_t offset)
{
swag->tail = NULL;
swag->head = NULL;
*/
XBT_INLINE void xbt_swag_insert_at_head(void *obj, xbt_swag_t swag)
{
+ xbt_assert(!xbt_swag_belongs(obj, swag) || swag->tail,
+ "This object belongs to an empty swag! Did you correctly initialize the object's hookup?");
- if (xbt_swag_belongs(obj, swag))
- return;
-
- (swag->count)++;
- if (swag->head == NULL) {
+ if (!swag->head) {
xbt_assert(!(swag->tail), "Inconsistent swag.");
swag->head = obj;
swag->tail = obj;
- return;
+ swag->count++;
+ }
+ else if (obj != swag->head && !xbt_swag_getPrev(obj, swag->offset)) {
+ xbt_swag_getNext(obj, swag->offset) = swag->head;
+ xbt_swag_getPrev(swag->head, swag->offset) = obj;
+ swag->head = obj;
+ swag->count++;
}
-
- xbt_swag_getNext(obj, swag->offset) = swag->head;
- xbt_swag_getPrev(swag->head, swag->offset) = obj;
- swag->head = obj;
}
/**
*/
XBT_INLINE void xbt_swag_insert_at_tail(void *obj, xbt_swag_t swag)
{
+ xbt_assert(!xbt_swag_belongs(obj, swag) || swag->tail,
+ "This object belongs to an empty swag! Did you correctly initialize the object's hookup?");
- if (xbt_swag_belongs(obj, swag))
- return;
-
- (swag->count)++;
- if (swag->head == NULL) {
+ if (!swag->head) {
xbt_assert(!(swag->tail), "Inconsistent swag.");
swag->head = obj;
swag->tail = obj;
- return;
+ swag->count++;
+ }
+ else if (obj != swag->head && !xbt_swag_getPrev(obj, swag->offset)) {
+ xbt_swag_getPrev(obj, swag->offset) = swag->tail;
+ xbt_swag_getNext(swag->tail, swag->offset) = obj;
+ swag->tail = obj;
+ swag->count++;
}
-
- xbt_swag_getPrev(obj, swag->offset) = swag->tail;
- xbt_swag_getNext(swag->tail, swag->offset) = obj;
- swag->tail = obj;
}
/**
*/
XBT_INLINE void *xbt_swag_remove(void *obj, xbt_swag_t swag)
{
- size_t offset = swag->offset;
-
- if ((!obj) || (!swag))
- return NULL;
- if (!xbt_swag_belongs(obj, swag)) /* Trying to remove an object that
- was not in this swag */
+ if (!obj)
return NULL;
- if (swag->head == swag->tail) { /* special case */
- if (swag->head != obj) /* Trying to remove an object that was not in this swag */
- return NULL;
- swag->head = NULL;
- swag->tail = NULL;
- xbt_swag_getNext(obj, offset) = xbt_swag_getPrev(obj, offset) = NULL;
- } else if (obj == swag->head) { /* It's the head */
- swag->head = xbt_swag_getNext(obj, offset);
- xbt_swag_getPrev(swag->head, offset) = NULL;
- xbt_swag_getNext(obj, offset) = NULL;
- } else if (obj == swag->tail) { /* It's the tail */
- swag->tail = xbt_swag_getPrev(obj, offset);
- xbt_swag_getNext(swag->tail, offset) = NULL;
+ size_t offset = swag->offset;
+ void* prev = xbt_swag_getPrev(obj, offset);
+ void* next = xbt_swag_getNext(obj, offset);
+
+ if (prev) {
+ xbt_swag_getNext(prev, offset) = next;
xbt_swag_getPrev(obj, offset) = NULL;
- } else { /* It's in the middle */
- xbt_swag_getNext(xbt_swag_getPrev(obj, offset), offset) =
- xbt_swag_getNext(obj, offset);
- xbt_swag_getPrev(xbt_swag_getNext(obj, offset), offset) =
- xbt_swag_getPrev(obj, offset);
- xbt_swag_getPrev(obj, offset) = xbt_swag_getNext(obj, offset) = NULL;
+ if (next) {
+ xbt_swag_getPrev(next, offset) = prev;
+ xbt_swag_getNext(obj, offset) = NULL;
+ }
+ else {
+ swag->tail = prev;
+ }
+ swag->count--;
}
- (swag->count)--;
+ else if (next) {
+ xbt_swag_getPrev(next, offset) = NULL;
+ xbt_swag_getNext(obj, offset) = NULL;
+ swag->head = next;
+ swag->count--;
+ }
+ else if (obj == swag->head) {
+ swag->head = swag->tail = NULL;
+ swag->count--;
+ }
+
return obj;
}
*/
void *xbt_swag_extract(xbt_swag_t swag)
{
- size_t offset = swag->offset;
- void *obj = NULL;
-
- if ((!swag) || (!(swag->head)))
+ if (!swag->head)
return NULL;
- obj = swag->head;
+ size_t offset = swag->offset;
+ void* obj = swag->head;
- if (swag->head == swag->tail) { /* special case */
+ if (obj == swag->tail) { /* special case */
swag->head = swag->tail = NULL;
- xbt_swag_getPrev(obj, offset) = xbt_swag_getNext(obj, offset) = NULL;
} else {
swag->head = xbt_swag_getNext(obj, offset);
xbt_swag_getPrev(swag->head, offset) = NULL;