csc.c

nuclues 内核源代码已经在arm7-9 上作了移植

/*************************************************************************/
/*                                                                       */
/*        Copyright (c) 1993-2001 Accelerated Technology, Inc.           */
/*                                                                       */
/* PROPRIETARY RIGHTS of Accelerated Technology are involved in the      */
/* subject matter of this material.  All manufacturing, reproduction,    */
/* use, and sales rights pertaining to this subject matter are governed  */
/* by the license agreement.  The recipient of this software implicitly  */
/* accepts the terms of the license.                                     */
/*                                                                       */
/*************************************************************************/

/*************************************************************************/
/*                                                                       */
/* FILE NAME                                            VERSION          */
/*                                                                       */
/*      csc.c                                           PLUS 1.13        */
/*                                                                       */
/* COMPONENT                                                             */
/*                                                                       */
/*      CS -    Common Services                                          */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This file contains linked list manipulation facilities used      */
/*      throughout the Nucleus PLUS system.  These facilities operate    */
/*      on doubly-linked circular lists.                                 */
/*                                                                       */
/* AUTHOR                                                                */
/*                                                                       */
/*      William E. Lamie, Accelerated Technology, Inc.                   */
/*                                                                       */
/* DATA STRUCTURES                                                       */
/*                                                                       */
/*      None                                                             */
/*                                                                       */
/* FUNCTIONS                                                             */
/*                                                                       */
/*      CSC_Place_On_List                   Place node at the end of a   */
/*                                            list                       */
/*      CSC_Priority_Place_On_List          Place node in priority order */
/*                                            on a list                  */
/*      CSC_Remove_From_List                Remove a node from a list    */
/*                                                                       */
/* DEPENDENCIES                                                          */
/*                                                                       */
/*      nucleus.h                           Nucleus PLUS constants       */
/*      cs_defs.h                           Common service definitions   */
/*                                                                       */
/* HISTORY                                                               */
/*                                                                       */
/*         NAME            DATE                    REMARKS               */
/*                                                                       */
/*      W. Lamie        03-01-1993      Created initial version 1.0      */
/*      D. Lamie        04-19-1993      Verified version 1.0             */
/*      W. Lamie        03-01-1994      Changed void to VOID, removed    */
/*                                        clearing link pointers during  */
/*                                        removal of a node from a list, */
/*                                        resulting in version 1.1       */
/*      R. Pfaff -                                                       */
/*      D. Lamie        03-18-1994      Verified version 1.1             */
/*      M.Q. Qian       04-17-1996      updated to version 1.2           */
/*      M. Trippi       03-24-1998      Released version 1.3.            */
/*                                                                       */
/*************************************************************************/
#define         NU_SOURCE_FILE


#include        "cs_defs.h"                 /* Include CS definitions    */
#include        "cs_extr.h"                 /* Common service functions  */


/*************************************************************************/
/*                                                                       */
/* FUNCTION                                                              */
/*                                                                       */
/*      CSC_Place_On_List                                                */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This function places the specified node at the end of specified  */
/*      linked list.                                                     */
/*                                                                       */
/* AUTHOR                                                                */
/*                                                                       */
/*      William E. Lamie, Accelerated Technology, Inc.                   */
/*                                                                       */
/* CALLED BY                                                             */
/*                                                                       */
/*      various components                                               */
/*                                                                       */
/* CALLS                                                                 */
/*                                                                       */
/*      None                                                             */
/*                                                                       */
/* INPUTS                                                                */
/*                                                                       */
/*      head                                Pointer to head pointer      */
/*      node                                Pointer to node to add       */
/*                                                                       */
/* OUTPUTS                                                               */
/*                                                                       */
/*      modified list                                                    */
/*                                                                       */
/* HISTORY                                                               */
/*                                                                       */
/*         NAME            DATE                    REMARKS               */
/*                                                                       */
/*      W. Lamie        03-01-1993      Created initial version 1.0      */
/*      D. Lamie        04-19-1993      Verified version 1.0             */
/*                                                                       */
/*************************************************************************/

#ifndef NU_INLINE

VOID    CSC_Place_On_List(CS_NODE **head, CS_NODE *new_node)
{

    /* Determine if the list in non-empty.  */
    if (*head)
    {
    
        /* The list is not empty.  Add the new node to the end of
           the list.  */
        new_node -> cs_previous =               (*head) -> cs_previous;
        (new_node -> cs_previous) -> cs_next =  new_node;
        new_node -> cs_next =                   (*head);
        (new_node -> cs_next) -> cs_previous =  new_node;
    }
    else
    {
    
        /* The list is empty, setup the head and the new node.  */
        (*head) =  new_node;
        new_node -> cs_previous =  new_node;
        new_node -> cs_next =      new_node;
    }
}

#endif

/*************************************************************************/
/*                                                                       */
/* FUNCTION                                                              */
/*                                                                       */
/*      CSC_Priority_Place_On_List                                       */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This function places the specified node after all other nodes on */
/*      the list of equal or greater priority.  Note that lower          */
/*      numerical values indicate greater priority.                      */
/*                                                                       */
/* AUTHOR                                                                */
/*                                                                       */
/*      William E. Lamie, Accelerated Technology, Inc.                   */
/*                                                                       */