#ifndef EXEC_LISTS_H
#define EXEC_LISTS_H
/*
** $Filename: exec/lists.h $
** $Release: 2.04 Includes, V37.4 $
** $Revision: 36.10 $
** $Date: 91/03/15 $
**
** Definitions and macros for use with Exec lists
**
** (C) Copyright 1985-1999 Amiga, Inc.
** All Rights Reserved
*/
#ifndef EXEC_NODES_H
#include "exec/nodes.h"
#endif /* EXEC_NODES_H */
/*
* Full featured list header.
*/
struct List {
struct Node *lh_Head;
struct Node *lh_Tail;
struct Node *lh_TailPred;
UBYTE lh_Type;
UBYTE l_pad;
}; /* word aligned */
/*
* Minimal List Header - no type checking
*/
struct MinList {
struct MinNode *mlh_Head;
struct MinNode *mlh_Tail;
struct MinNode *mlh_TailPred;
}; /* longword aligned */
/*
* Check for the presence of any nodes on the given list. These
* macros are even safe to use on lists that are modified by other
* tasks. However; if something is simultaneously changing the
* list, the result of the test is unpredictable.
*
* Unless you first arbitrated for ownership of the list, you can't
* _depend_ on the contents of the list. Nodes might have been added
* or removed during or after the macro executes.
*
* if( IsListEmpty(list) ) printf("List is empty\n");
*/
#define IsListEmpty(x) \
( ((x)->lh_TailPred) == (struct Node *)(x) )
#define IsMsgPortEmpty(x) \
( ((x)->mp_MsgList.lh_TailPred) == (struct Node *)(&(x)->mp_MsgList) )
#endif /* EXEC_LISTS_H */