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view src/nucleus/iod.c @ 268:f2e52cab0a73

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abb_inth.c: check all interrupt causes, not just one The original code used if - else if - else if etc constructs, thus the first detected interrupt was the only one handled. However, Iota ITSTATREG is a clear-on-read register, thus if we only handle the first detected interrupt and skip checking the others, then the other interrupts will be lost, if more than one interrupt happened to occur in one ABB interrupt handling cycle - a form of rare race condition. Change the code to check all interrupts that were read in this cycle.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 13 Jun 2021 18:17:53 +0000
parents 4e78acac3d88
children
line wrap: on
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/*************************************************************************/
/*                                                                       */
/*               Copyright Mentor Graphics Corporation 2002              */
/*                         All Rights Reserved.                          */
/*                                                                       */
/* THIS WORK CONTAINS TRADE SECRET AND PROPRIETARY INFORMATION WHICH IS  */
/* THE PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS LICENSORS AND IS   */
/* SUBJECT TO LICENSE TERMS.                                             */
/*                                                                       */
/*************************************************************************/

/*************************************************************************/
/*                                                                       */
/* FILE NAME                                               VERSION       */
/*                                                                       */
/*      iod.c                                          Nucleus PLUS 1.14 */
/*                                                                       */
/* COMPONENT                                                             */
/*                                                                       */
/*      IO - Input/Output Driver Management                              */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This file contains global data structures for use within the     */
/*      Input/Output Driver Management component.                        */
/*                                                                       */
/* DATA STRUCTURES                                                       */
/*                                                                       */
/*      IOD_Created_Drivers_List            Pointer to the linked-list   */
/*                                            of created I/O drivers     */
/*      IOD_Total_Drivers                   Total number of created      */
/*                                            I/O drivers                */
/*      IOD_List_Protect                    I/O driver list protection   */
/*                                                                       */
/* FUNCTIONS                                                             */
/*                                                                       */
/*      None                                                             */
/*                                                                       */
/* DEPENDENCIES                                                          */
/*                                                                       */
/*      io_defs.h                           I/O Driver Management consts */
/*      tc_defs.h                           Thread Control constants     */
/*                                                                       */
/* HISTORY                                                               */
/*                                                                       */
/*        DATE                    REMARKS                                */
/*                                                                       */
/*      03-01-1993      Created initial version 1.0                      */
/*      04-19-1993      Verified version 1.0                             */
/*      03-01-1994      Updated copyright notice,                        */
/*                      resulting in version 1.1                         */
/*                                                                       */
/*      03-18-1994      Verified version 1.1                             */
/*      04-17-1996      updated to version 1.2                           */
/*      03-24-1998      Released version 1.3                             */
/*      03-26-1999      Released 1.11m (new release                      */
/*                        numbering scheme)                              */
/*      04-17-2002      Released version 1.13m                           */
/*      11-07-2002      Released version 1.14                            */
/*************************************************************************/
#define         NU_SOURCE_FILE

#include        "io_defs.h"                 /* I/O Driver constants      */
#include        "tc_defs.h"                 /* Thread control constants  */


/* IOD_Created_Drivers_List is the head pointer of the linked list of
   created I/O drivers.  If the list is NU_NULL, there are no I/O drivers
   created.  */

CS_NODE        *IOD_Created_Drivers_List;


/* IOD_Total_Drivers contains the number of currently created
   I/O drivers.  */

UNSIGNED        IOD_Total_Drivers;


/* IOD_List_Protect is a list protection structure used to block any other
   thread from access to the created drivers list.  */

TC_PROTECT      IOD_List_Protect;