pid.c

不可多得Nucleus plus的源代码程序

/*************************************************************************/
/*                                                                       */
/*        Copyright (c) 1993-1996 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          */
/*                                                                       */
/*      pid.c                                           PLUS  1.2        */
/*                                                                       */
/* COMPONENT                                                             */
/*                                                                       */
/*      PI - Pipe Management                                             */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This file contains global data structures for use within the     */
/*      pipe management component.                                       */
/*                                                                       */
/* AUTHOR                                                                */
/*                                                                       */
/*      William E. Lamie, Accelerated Technology, Inc.                   */
/*                                                                       */
/* DATA STRUCTURES                                                       */
/*                                                                       */
/*      PID_Created_Pipe_List               Pointer to the linked-list   */
/*                                            of created pipes           */
/*      PID_Total_Pipes                     Total number of created      */
/*                                            pipes                      */
/*      PID_List_Protect                    Pipe list protection         */
/*                                                                       */
/* FUNCTIONS                                                             */
/*                                                                       */
/*      None                                                             */
/*                                                                       */
/* DEPENDENCIES                                                          */
/*                                                                       */
/*      pi_defs.h                           Pipe Management 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           */
/*                                                                       */
/*************************************************************************/
#define         NU_SOURCE_FILE

#include        "pi_defs.h"                 /* Pipe constants            */


/* PID_Created_Pipes_List is the head pointer of the linked list of 
   created pipes.  If the list is NU_NULL, there are no pipes
   created.  */
   
CS_NODE        *PID_Created_Pipes_List;


/* PID_Total_Pipes contains the number of currently created 
   pipes.  */

UNSIGNED        PID_Total_Pipes;


/* PID_List_Protect is a list protection structure used to block any other
   thread from access to the created pipe list.  */
   
TC_PROTECT      PID_List_Protect;