diff src/nucleus/evf.c @ 0:4e78acac3d88

src/{condat,cs,gpf,nucleus}: import from Selenite
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 16 Oct 2020 06:23:26 +0000
parents
children
line wrap: on
line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/nucleus/evf.c	Fri Oct 16 06:23:26 2020 +0000
@@ -0,0 +1,366 @@
+/*************************************************************************/
+/*                                                                       */
+/*               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       */
+/*                                                                       */
+/*      evf.c                                          Nucleus PLUS 1.14 */
+/*                                                                       */
+/* COMPONENT                                                             */
+/*                                                                       */
+/*      EV - Event Group Management                                      */
+/*                                                                       */
+/* DESCRIPTION                                                           */
+/*                                                                       */
+/*      This file contains routines to obtain facts about the Event      */
+/*      Group Management component.                                      */
+/*                                                                       */
+/* DATA STRUCTURES                                                       */
+/*                                                                       */
+/*      None                                                             */
+/*                                                                       */
+/* FUNCTIONS                                                             */
+/*                                                                       */
+/*      EVF_Established_Event_Groups        Number of created groups     */
+/*      EVF_Event_Group_Pointers            Build event group pointer    */
+/*                                            list                       */
+/*      EVF_Event_Group_Information         Retrieve event group info    */
+/*                                                                       */
+/* DEPENDENCIES                                                          */
+/*                                                                       */
+/*      cs_extr.h                           Common Service functions     */
+/*      tc_extr.h                           Thread Control functions     */
+/*      ev_extr.h                           Event Group functions        */
+/*      hi_extr.h                           History functions            */
+/*                                                                       */
+/* HISTORY                                                               */
+/*                                                                       */
+/*         DATE                    REMARKS                               */
+/*                                                                       */
+/*      03-01-1994      Initial version of event fact                    */
+/*                      service file, version 1.1                        */
+/*                                                                       */
+/*      03-18-1994      Verified version 1.1                             */
+/*      04-17-1996      updated to version 1.2                           */
+/*      11-18-1996      Protected Informational service                  */
+/*                      from NULL Control Block pointers                 */
+/*                      creating 1.2a. (SPR220)                          */
+/*      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        "cs_extr.h"                 /* Common service functions  */
+#include        "tc_extr.h"                 /* Thread control functions  */
+#include        "ev_extr.h"                 /* Event Group functions     */
+#include        "hi_extr.h"                 /* History functions         */
+
+
+/* Define external inner-component global data references.  */
+
+extern CS_NODE         *EVD_Created_Event_Groups_List;
+extern UNSIGNED         EVD_Total_Event_Groups;
+extern TC_PROTECT       EVD_List_Protect;
+
+
+
+/*************************************************************************/
+/*                                                                       */
+/* FUNCTION                                                              */
+/*                                                                       */
+/*      EVF_Established_Event_Groups                                     */
+/*                                                                       */
+/* DESCRIPTION                                                           */
+/*                                                                       */
+/*      This function returns the current number of established          */
+/*      event groups.  Event groups previously deleted are no longer     */
+/*      considered established.                                          */
+/*                                                                       */
+/* CALLED BY                                                             */
+/*                                                                       */
+/*      Application                                                      */
+/*                                                                       */
+/* CALLS                                                                 */
+/*                                                                       */
+/*      [TCT_Check_Stack]                   Stack checking function      */
+/*                                                                       */
+/* INPUTS                                                                */
+/*                                                                       */
+/*      None                                                             */
+/*                                                                       */
+/* OUTPUTS                                                               */
+/*                                                                       */
+/*      EVD_Total_Event_Groups              Number of established        */
+/*                                            event groups               */
+/*                                                                       */
+/* HISTORY                                                               */
+/*                                                                       */
+/*         DATE                    REMARKS                               */
+/*                                                                       */
+/*      03-01-1993      Created initial version 1.0                      */
+/*      04-19-1993      Verified version 1.0                             */
+/*      03-01-1994      Modified function interface,                     */
+/*                      resulting in version 1.1                         */
+/*                                                                       */
+/*      03-18-1994      Verified version 1.1                             */
+/*                                                                       */
+/*************************************************************************/
+UNSIGNED  EVF_Established_Event_Groups(VOID)
+{
+
+
+#ifdef  NU_ENABLE_STACK_CHECK
+
+    /* Call stack checking function to check for an overflow condition.  */
+    TCT_Check_Stack();
+
+#endif
+
+    /* Return the number of established event groups.  */
+    return(EVD_Total_Event_Groups);
+}
+
+
+/*************************************************************************/
+/*                                                                       */
+/* FUNCTION                                                              */
+/*                                                                       */
+/*      EVF_Event_Group_Pointers                                         */
+/*                                                                       */
+/* DESCRIPTION                                                           */
+/*                                                                       */
+/*      This function builds a list of event group pointers, starting at */
+/*      the specified location.  The number of event group pointers      */
+/*      placed in the list is equivalent to the total number of          */
+/*      event groups or the maximum number of pointers specified in the  */
+/*      call.                                                            */
+/*                                                                       */
+/* CALLED BY                                                             */
+/*                                                                       */
+/*      Application                                                      */
+/*                                                                       */
+/* CALLS                                                                 */
+/*                                                                       */
+/*      [TCT_Check_Stack]                   Stack checking function      */
+/*      TCT_Protect                         Protect created list         */
+/*      TCT_Unprotect                       Release protection           */
+/*                                                                       */
+/* INPUTS                                                                */
+/*                                                                       */
+/*      pointer_list                        Pointer to the list area     */
+/*      maximum_pointers                    Maximum number of pointers   */
+/*                                                                       */
+/* OUTPUTS                                                               */
+/*                                                                       */
+/*      pointers                            Number of event groups placed*/
+/*                                            in the list                */
+/* HISTORY                                                               */
+/*                                                                       */
+/*         DATE                    REMARKS                               */
+/*                                                                       */
+/*      03-01-1993      Created initial version 1.0                      */
+/*      04-19-1993      Verified version 1.0                             */
+/*      08-09-1993      Corrected pointer retrieval                      */
+/*                      loop, resulting in version 1.0a                  */
+/*      08-09-1993      Verified version 1.0a                            */
+/*      03-01-1994      Modified function interface,                     */
+/*                      resulting in version 1.1                         */
+/*                                                                       */
+/*      03-18-1994      Verified version 1.1                             */
+/*                                                                       */
+/*************************************************************************/
+UNSIGNED  EVF_Event_Group_Pointers(NU_EVENT_GROUP **pointer_list,
+                                                UNSIGNED maximum_pointers)
+{
+CS_NODE         *node_ptr;                  /* Pointer to each GCB       */
+UNSIGNED         pointers;                  /* Number of pointers in list*/
+NU_SUPERV_USER_VARIABLES
+
+    /* Switch to supervisor mode */
+    NU_SUPERVISOR_MODE();
+
+#ifdef  NU_ENABLE_STACK_CHECK
+
+    /* Call stack checking function to check for an overflow condition.  */
+    TCT_Check_Stack();
+
+#endif
+
+    /* Initialize the number of pointers returned.  */
+    pointers =  0;
+
+    /* Protect against access to the list of created event groups.  */
+    TCT_Protect(&EVD_List_Protect);
+
+    /* Loop until all event group pointers are in the list or until
+       the maximum list size is reached.  */
+    node_ptr =  EVD_Created_Event_Groups_List;
+    while ((node_ptr) && (pointers < maximum_pointers))
+    {
+
+        /* Place the node into the destination list.  */
+        *pointer_list++ =  (NU_EVENT_GROUP *) node_ptr;
+
+        /* Increment the pointers variable.  */
+        pointers++;
+
+        /* Position the node pointer to the next node.  */
+        node_ptr =  node_ptr -> cs_next;
+
+        /* Determine if the pointer is at the head of the list.  */
+        if (node_ptr == EVD_Created_Event_Groups_List)
+
+            /* The list search is complete.  */
+            node_ptr =  NU_NULL;
+    }
+
+    /* Release protection against access to the list of created
+       event groups. */
+    TCT_Unprotect();
+
+    /* Return to user mode */
+    NU_USER_MODE();
+
+    /* Return the number of pointers in the list.  */
+    return(pointers);
+}
+
+
+/*************************************************************************/
+/*                                                                       */
+/* FUNCTION                                                              */
+/*                                                                       */
+/*      EVF_Event_Group_Information                                      */
+/*                                                                       */
+/* DESCRIPTION                                                           */
+/*                                                                       */
+/*      This function returns information about the specified event      */
+/*      group. However, if the supplied event group pointer is invalid,  */
+/*      the function simply returns an error status.                     */
+/*                                                                       */
+/* CALLED BY                                                             */
+/*                                                                       */
+/*      Application                                                      */
+/*                                                                       */
+/* CALLS                                                                 */
+/*                                                                       */
+/*      [TCT_Check_Stack]                   Stack checking function      */
+/*      TCT_System_Protect                  Protect event group          */
+/*      TCT_Unprotect                       Release protection           */
+/*                                                                       */
+/* INPUTS                                                                */
+/*                                                                       */
+/*      event_group_ptr                     Pointer to the event group   */
+/*      name                                Destination for the name     */
+/*      event_flags                         Pointer to a variable to hold*/
+/*                                            the current event flags    */
+/*      tasks_waiting                       Destination for the tasks    */
+/*                                            waiting count              */
+/*      first_task                          Destination for the pointer  */
+/*                                            to the first task waiting  */
+/*                                                                       */
+/* OUTPUTS                                                               */
+/*                                                                       */
+/*      NU_SUCCESS                          If a valid event group       */
+/*                                            pointer is supplied        */
+/*      NU_INVALID_GROUP                    If event group pointer is    */
+/*                                            not valid                  */
+/*                                                                       */
+/* HISTORY                                                               */
+/*                                                                       */
+/*         DATE                    REMARKS                               */
+/*                                                                       */
+/*      03-01-1993      Created initial version 1.0                      */
+/*      04-19-1993      Verified version 1.0                             */
+/*      03-01-1994      Modified function interface,                     */
+/*                      resulting in version 1.1                         */
+/*                                                                       */
+/*      03-18-1994      Verified version 1.1                             */
+/*      11-18-1996      Corrected SPR220.                                */
+/*                                                                       */
+/*************************************************************************/
+STATUS EVF_Event_Group_Information(NU_EVENT_GROUP *event_group_ptr, CHAR *name,
+        UNSIGNED *event_flags, UNSIGNED *tasks_waiting, NU_TASK **first_task)
+{
+
+EV_GCB         *event_group;                /* Event control block ptr   */
+INT             i;                          /* Working integer variable  */
+STATUS          completion;                 /* Completion status         */
+NU_SUPERV_USER_VARIABLES
+
+    /* Switch to supervisor mode */
+    NU_SUPERVISOR_MODE();
+
+    /* Move input event group pointer into internal pointer.  */
+    event_group =  (EV_GCB *) event_group_ptr;
+
+
+#ifdef  NU_ENABLE_STACK_CHECK
+
+    /* Call stack checking function to check for an overflow condition.  */
+    TCT_Check_Stack();
+
+#endif
+
+    /* Determine if this event_group id is valid.  */
+    if ((event_group != NU_NULL) && (event_group -> ev_id == EV_EVENT_ID))
+    {
+
+        /* Setup protection of the event_group.  */
+        TCT_System_Protect();
+
+        /* The event_group pointer is valid.  Reflect this in the completion
+           status and fill in the actual information.  */
+        completion =  NU_SUCCESS;
+
+        /* Copy the event_group's name.  */
+        for (i = 0; i < NU_MAX_NAME; i++)
+            *name++ =  event_group -> ev_name[i];
+
+        /* Return the current event flags.  */
+        *event_flags =  event_group -> ev_current_events;
+
+        /* Retrieve the number of tasks waiting and the pointer to the
+           first task waiting.  */
+        *tasks_waiting =  event_group -> ev_tasks_waiting;
+        if (event_group -> ev_suspension_list)
+
+            /* There is a task waiting.  */
+            *first_task =  (NU_TASK *)
+                (event_group -> ev_suspension_list) -> ev_suspended_task;
+        else
+
+            /* There are no tasks waiting.  */
+            *first_task =  NU_NULL;
+
+        /* Release protection of the event group.  */
+        TCT_Unprotect();
+    }
+    else
+
+        /* Indicate that the event group pointer is invalid.   */
+        completion =  NU_INVALID_GROUP;
+
+    /* Return to user mode */
+    NU_USER_MODE();
+
+    /* Return the appropriate completion status.  */
+    return(completion);
+}
+
+
+
+