pii.c

抢占

/*************************************************************************/
/*                                                                       */
/*        Copyright (c) 1993-1998 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          */
/*                                                                       */
/*      pii.c                                           PLUS  1.3        */
/*                                                                       */
/* COMPONENT                                                             */
/*                                                                       */
/*      PI - Pipe Management                                             */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This file contains the initialization routine for the pipe       */
/*      management component.                                            */
/*                                                                       */
/* AUTHOR                                                                */
/*                                                                       */
/*      William E. Lamie, Accelerated Technology, Inc.                   */
/*                                                                       */
/* DATA STRUCTURES                                                       */
/*                                                                       */
/*      None                                                             */
/*                                                                       */
/* FUNCTIONS                                                             */
/*                                                                       */
/*      PII_Initialize                      Pipe Management Initialize   */
/*                                                                       */
/* DEPENDENCIES                                                          */
/*                                                                       */
/*      pi_defs.h                           Pipe component constants     */
/*                                                                       */
/* 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      Modified copyright, 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        "pi_defs.h"                 /* Pipe constants            */


/* Define external inner-component global data references.  */

extern CS_NODE         *PID_Created_Pipes_List;
extern UNSIGNED         PID_Total_Pipes;
extern TC_PROTECT       PID_List_Protect;


/*************************************************************************/
/*                                                                       */
/* FUNCTION                                                              */
/*                                                                       */
/*      PII_Initialize                                                   */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This function initializes the data structures that control the   */
/*      operation of the Pipe component (PI).  There are no pipes        */
/*      initially.                                                       */
/*                                                                       */
/* AUTHOR                                                                */
/*                                                                       */
/*      William E. Lamie, Accelerated Technology, Inc.                   */
/*                                                                       */
/* CALLED BY                                                             */
/*                                                                       */
/*      INC_Initialize                      System initialization        */
/*                                                                       */
/* CALLS                                                                 */
/*                                                                       */
/*      None                                                             */
/*                                                                       */
/* INPUTS                                                                */
/*                                                                       */
/*      None                                                             */
/*                                                                       */
/* OUTPUTS                                                               */
/*                                                                       */
/*      PID_Created_Pipes_List              List of created pipes        */
/*      PID_Total_Pipes                     Number of created pipes      */
/*      PID_List_Protect                    Protection for pipe list     */
/*                                                                       */
/* HISTORY                                                               */
/*                                                                       */
/*         NAME            DATE                    REMARKS               */
/*                                                                       */
/*      W. Lamie        03-01-1993      Created initial version 1.0      */
/*      D. Lamie        04-19-1993      Verified version 1.0             */
/*                                                                       */
/*************************************************************************/
VOID  PII_Initialize(VOID)
{

    /* Initialize the created pipe list to NU_NULL.  */
    PID_Created_Pipes_List =  NU_NULL;
    
    /* Initialize the total number of created pipes to 0.  */
    PID_Total_Pipes =  0;
    
    /* Initialize the list protection structure.  */
    PID_List_Protect.tc_tcb_pointer =      NU_NULL;
}