📄 tcd.c
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/*************************************************************************/
/* */
/* 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 */
/* */
/* tcd.c PLUS 1.2 */
/* */
/* COMPONENT */
/* */
/* TC - Thread Control */
/* */
/* DESCRIPTION */
/* */
/* This file contains global data structures for use within this */
/* component. */
/* */
/* AUTHOR */
/* */
/* William E. Lamie, Accelerated Technology, Inc. */
/* */
/* DATA STRUCTURES */
/* */
/* TCD_Created_Tasks_List Pointer to the linked-list */
/* of created tasks */
/* TCD_Total_Tasks Total number of created tasks*/
/* TCD_Priority_List Array of pointers to ready */
/* tasks, indexed by priority */
/* TCD_Execute_Task Highest priority task to */
/* execute */
/* TCD_Priority_Groups Bit map of 32 groups of task */
/* priority */
/* TCD_Sub_Priority_Groups An array of 32 sub-priority */
/* groups */
/* TCD_Lowest_Set_Bit Lookup table to find the */
/* lowest bit set in a byte */
/* TCD_Highest_Priority Highest priority ready */
/* TCD_Created_HISRs_List Pointer to the linked-list */
/* of created HISRs */
/* TCD_Total_HISRs Total number of created HISRs*/
/* TCD_Active_HISR_Heads Active HISR list head ptrs */
/* TCD_Active_HISR_Tails Active HISR list tail ptrs */
/* TCD_Execute_HISR Highest priority HISR to */
/* execute */
/* TCD_Current_Thread Pointer to the currently */
/* executing thread */
/* TCD_Registered_LISRs List of registered LISRs */
/* TCD_LISR_Pointers Actual LISR pointers */
/* TCD_Interrupt_Count Count of ISRs in progress */
/* TCD_Stack_Switched Flag indicating that stack */
/* was switched in an ISR */
/* TCD_List_Protect Task list protection */
/* TCD_System_Protect System protection */
/* TCD_System_Stack System stack pointer - top */
/* TCD_LISR_Protect Protect LISR registration */
/* TCD_HISR_Protect Protect the list of created */
/* HISRs */
/* TCD_Interrupt_Level Enable interrupt level */
/* TCD_Unhandled_Interrupt Contains the most recent */
/* unhandled interrupt in */
/* system error conditions */
/* */
/* FUNCTIONS */
/* */
/* None */
/* */
/* DEPENDENCIES */
/* */
/* cs_defs.h Common Service constants */
/* tc_defs.h Thread Control 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 11-01-1993 Added variable to save last */
/* unhandled interrupt in system */
/* error conditions, resulting in */
/* version 1.0a */
/* D. Lamie 11-01-1993 Verified version 1.0a */
/* W. Lamie 03-01-1994 Change schedule protection to a */
/* system protection to improve */
/* performance, 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 "cs_defs.h" /* Common Service constants */
#include "tc_defs.h" /* Thread Control constants */
/* TCD_Created_Tasks_List is the head pointer of the linked list of
created tasks. If the list is NU_NULL, there are no tasks created. */
CS_NODE *TCD_Created_Tasks_List;
/* TCD_Total_Tasks contains the number of currently created tasks. */
UNSIGNED TCD_Total_Tasks;
/* TCD_Priority_List is an array of TCB pointers. Each element of the array
is effectively the head pointer of the list of tasks ready for execution
at that priority. If the pointer is NULL, there are no tasks ready
for execution at that priority. The array is indexed by priority. */
TC_TCB *TCD_Priority_List[TC_PRIORITIES];
/* TCD_Priority_Groups is a 32-bit unsigned integer that is used as a bit
map. Each bit corresponds to an 8-priority group. For example, if bit 0
is set, at least one task of priority 0 through 8 is ready for execution. */
UNSIGNED TCD_Priority_Groups;
/* TCD_Sub_Priority_Groups is an array of sub-priority groups. These are
also used as bit maps. Index 0 of this array corresponds to priorities
0 through 8. Bit 0 of this element represents priority 0, while bit 7
represents priority 7. */
DATA_ELEMENT TCD_Sub_Priority_Groups[TC_MAX_GROUPS];
/* TCD_Lowest_Set_Bit is nothing more than a standard lookup table. The
table is indexed by values ranging from 1 to 255. The value at that
position in the table indicates the number of the lowest set bit. This is
used to determine the highest priority task represented in the previously
defined bit maps. */
UNSIGNED_CHAR TCD_Lowest_Set_Bit[] = {0,
0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0,
1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1,
0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0,
2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2,
0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0,
1, 0, 7, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1,
0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3,
0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0,
1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1,
0, 2, 0, 1, 0};
/* TCD_Highest_Priority contains the highest priority task ready for execution.
Note that this does not necessarily represent the priority of the currently
executing task. This is true if the currently executing task has preemption
disabled. If no tasks are executing, this variable is set to the maximum
priority. */
INT TCD_Highest_Priority;
/* TCD_Execute_Task is a pointer to the task to execute. Note that this
pointer does not necessarily point to the currently executing task. There
are several points in the system where this is true. One situation is
when preemption is about to take place. Another situation can result from
a internal protection conflict. */
TC_TCB *TCD_Execute_Task;
/* TCD_Created_HISRs_List is the head pointer of the list of created High-
Level Interrupt Service Routines (HISR). If this pointer is NU_NULL, there
are no HISRs currently created. */
CS_NODE *TCD_Created_HISRs_List;
/* TCD_Total_HISRs contains the number of currently created HISRs. */
UNSIGNED TCD_Total_HISRs;
/* TCD_Active_HISR_Heads is an array of active HISR list head pointers.
There are three HISR priorities available. The HISR priority is an index
into this table. Priority/index 0 represents the highest priority. */
TC_HCB *TCD_Active_HISR_Heads[TC_HISR_PRIORITIES];
/* TCD_Active_HISR_Tails is an array of active HISR list tail pointers.
There are three HISR priorities available. The HISR priority is an index
into this table. Priority/index 0 represents the highest priority. */
TC_HCB *TCD_Active_HISR_Tails[TC_HISR_PRIORITIES];
/* TCD_Execute_HISR contains a pointer to the highest priority HISR to execute.
If this pointer is NU_NULL, no HISRs are currently activated. Note that
the current thread pointer is not always equal to this pointer. */
TC_HCB *TCD_Execute_HISR;
/* TCD_Current_Thread points to the control block of the currently executing
thread of execution. Therefore, this variable points at either a TC_TCB
or a TC_HCB structure. Except for initialization, this variable is set
and cleared in the target dependent portion of this component. */
VOID *TCD_Current_Thread;
/* TCD_System_Stack contains the system stack base pointer. When the system
is idle or in interrupt processing the system stack pointer is used. This
variable is usually setup during target dependent initialization. */
VOID *TCD_System_Stack;
/* TCD_Registered_LISRs is a list that specifies whether or not a
LISR is registered for a given interrupt vector. If the value in the
list indexed by the vector is non-zero, then that value can be used
as the index into the list of LISR pointers to find the actual registered
LISR. */
UNSIGNED_CHAR TCD_Registered_LISRs[NU_MAX_VECTORS];
/* TCD_LISR_Pointers is a list of LISR pointers that indicate the LISR function
to call when the interrupt occurs. If the entry is NULL, it is
available. */
VOID (*TCD_LISR_Pointers[NU_MAX_LISRS])(INT vector);
/* TCD_Interrupt_Count contains the number of Interrupt Service Routines (ISRs)
currently in progress. If the contents of this variable is zero, then no
interrupts are in progress. If the contents are greater than 1, nested
interrupts are being processed. */
INT TCD_Interrupt_Count;
/* TCD_Stack_Switched contains a flag indicating that the system stack was
switched to after the thread's context was saved. This variable is not
used in all ports. */
INT TCD_Stack_Switched;
/* TCD_List_Protect is a structure that is used to protect against multiple
access to the list of established tasks. */
TC_PROTECT TCD_List_Protect;
/* TCD_System_Protect is a structure that is used to provide protection
against multiple threads accessing the same system structures at the
same time. */
TC_PROTECT TCD_System_Protect;
/* TCD_LISR_Protect is a structure that is used to provide protection against
multiple threads accessing the LISR registration structures at the same
time. */
TC_PROTECT TCD_LISR_Protect;
/* TCD_HISR_Protect is a structure that is used to provide protection against
multiple threads accessing the created HISR linked-list at the same time. */
TC_PROTECT TCD_HISR_Protect;
/* TCD_Interrupt_Level is a variable that contains the enabled interrupt
level. If the target processor does not have multiple enable interrupt
levels, this variable is a boolean. */
INT TCD_Interrupt_Level;
/* TCD_Unhandled_Interrupt is a variable that contains the last unhandled
interrupt in system error conditions. */
INT TCD_Unhandled_Interrupt;
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