115 lines
2.1 KiB
C
115 lines
2.1 KiB
C
/*++
|
|
|
|
Copyright (c) 1993 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
BILINK.C
|
|
|
|
Abstract:
|
|
|
|
Management for doubly linked lists
|
|
|
|
Author:
|
|
|
|
George Joy
|
|
|
|
Environment:
|
|
|
|
32-bit 'C'
|
|
|
|
Revision History:
|
|
|
|
--*/
|
|
#include <windows.h>
|
|
#include <dpf.h>
|
|
#include "bilink.h"
|
|
|
|
// Note: serialization of access to BILINK structures must
|
|
// take place in the calling code. Operations are
|
|
// not intrinsically atomic.
|
|
|
|
#ifdef DEBUG
|
|
int FindObject(
|
|
BILINK *link,
|
|
BILINK *list
|
|
)
|
|
{
|
|
BILINK *p = list->next;
|
|
while(p != link && p != list)
|
|
p= p->next;
|
|
return (p==link);
|
|
}
|
|
#endif
|
|
|
|
void InsertAfter(
|
|
BILINK *in,
|
|
BILINK *after
|
|
)
|
|
/*=========================================================================
|
|
* Description:
|
|
* Insert an object after a specified object in the doubly linked list.
|
|
* The after object could be the Head BILINK for adding to the head of a
|
|
* queue.
|
|
* Returns:
|
|
*
|
|
*/
|
|
{
|
|
#ifdef DEBUG
|
|
if(FindObject(in,after)) {
|
|
DPF(0,"Attempt to re-insert object in BILINK queue\n");
|
|
DEBUG_BREAK();
|
|
}
|
|
#endif
|
|
in->next = after->next;
|
|
in->prev = after;
|
|
after->next->prev = in;
|
|
after->next = in;
|
|
}
|
|
|
|
void InsertBefore(
|
|
BILINK *in,
|
|
BILINK *before
|
|
)
|
|
/*=========================================================================
|
|
* Description:
|
|
* Inserts an object before a specified object in the doubly linked list.
|
|
* The before object could be the Head BILINK for adding to the end
|
|
* of the queue
|
|
* CALLED WITH INTERRUPTS_OFF
|
|
*
|
|
* Returns:
|
|
*
|
|
*/
|
|
{
|
|
#ifdef DEBUG
|
|
if(FindObject(in,before)) {
|
|
DPF(0,"Attempt to re-insert object in BILINK queue\n");
|
|
DEBUG_BREAK();
|
|
}
|
|
#endif
|
|
in->next = before;
|
|
in->prev = before->prev;
|
|
before->prev->next = in;
|
|
before->prev = in;
|
|
}
|
|
|
|
void Delete(
|
|
BILINK *p
|
|
)
|
|
/*=========================================================================
|
|
* Description:
|
|
*
|
|
* Delete a object from a doubly linked list. Make sure it IS on a list!
|
|
* CALLED WITH INTERRUPTS OFF (must be atomic).
|
|
*
|
|
* Returns:
|
|
*
|
|
*/
|
|
{
|
|
p->next->prev = p->prev;
|
|
p->prev->next = p->next;
|
|
// p->next = p->prev = 0;
|
|
}
|
|
|