?? tcc.c
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/*************************************************************************/
/* */
/* Copyright (c) 1993-2001 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 */
/* */
/* tcc.c PLUS 1.13 */
/* */
/* COMPONENT */
/* */
/* TC - Thread Control */
/* */
/* DESCRIPTION */
/* */
/* This file contains the core routines for the Thread Control */
/* component. */
/* */
/* AUTHOR */
/* */
/* Accelerated Technology, Inc. */
/* */
/* DATA STRUCTURES */
/* */
/* None */
/* */
/* FUNCTIONS */
/* */
/* TCC_Create_Task Create a task */
/* TCC_Delete_Task Delete a task */
/* TCC_Create_HISR Create HISR */
/* TCC_Delete_HISR Delete HISR */
/* TCC_Reset_Task Reset the specified task */
/* TCC_Terminate_Task Terminate the specified task */
/* TCC_Resume_Task Resume a task */
/* TCC_Resume_Service Resume a task service call */
/* TCC_Suspend_Task Suspend a task */
/* TCC_Suspend_Service Suspend a task service call */
/* TCC_Task_Timeout Task timeout function */
/* TCC_Task_Sleep Task sleep request */
/* TCC_Relinquish Relinquish task execution */
/* TCC_Time_Slice Process task time-slice */
/* TCC_Current_Task_Pointer Retrieve current task pointer*/
/* TCC_Current_HISR_Pointer Retrieve current HISR pointer*/
/* TCC_Task_Shell Task execution shell */
/* TCC_Signal_Shell Signal execution shell */
/* TCC_Dispatch_LISR Dispatch LISR routine */
/* TCC_Register_LISR Register an LISR */
/* */
/* DEPENDENCIES */
/* */
/* cs_extr.h Common Service functions */
/* tc_extr.h Thread Control functions */
/* in_extr.h Initialization/Interrupt */
/* functions */
/* tm_extr.h Timer Control function */
/* er_extr.h Error handling function */
/* hi_extr.h History functions */
/* */
/* HISTORY */
/* */
/* DATE REMARKS */
/* */
/* 03-01-1993 Created initial version 1.0 */
/* 04-19-1993 Verified version 1.0 */
/* 05-15-1993 Corrected comment problems in */
/* TCC_Control_Signals and */
/* TCC_Register_Signal_Handler, */
/* making version 1.0a */
/* 05-15-1993 Verified version 1.0a */
/* 06-01-1993 Modified a multi-line comment */
/* after a #include directive */
/* that gave some compilers a */
/* problem, making version 1.0b */
/* 06-01-1993 Verified version 1.0b */
/* 08-09-1993 Corrected pointer retrieval */
/* loop, resulting in version 1.0c */
/* 08-09-1993 Verified version 1.0c */
/* 09-19-1993 Corrected an initialization */
/* problem of de-referencing a */
/* NULL pointer, resulting in */
/* version 1.0d */
/* 09-19-1993 Verified version 1.0d */
/* 11-01-1993 Added logic to save unhandled */
/* interrupt vector number in */
/* a global variable, resulting */
/* in version 1.0e */
/* 11-01-1993 Verified version 1.0e */
/* 02-01-1994 Corrected a suspension with */
/* timeout problem that caused */
/* unconditional task suspension */
/* for timeouts and sleeps for 1 */
/* tick, resulting in version 1.0f */
/* 02-01-1994 Verified version 1.0f */
/* 03-01-1994 Added another routine that */
/* validates resume calls with */
/* the appropriate protection and */
/* added code to clear cleanup */
/* information at task create and */
/* task resume time, resulting in */
/* version 1.0g */
/* 03-01-1994 Verified version 1.0g */
/* 03-01-1994 Moved non-core functions into */
/* supplemental files, changed */
/* function interfaces to match */
/* those in prototype, added */
/* register options, fixed bug */
/* in suspending current task from */
/* a HISR, added a system protect */
/* structure to reduce overhead */
/* in protection, moved resume */
/* validate to error checking */
/* file, resulting in version 1.1 */
/* */
/* 03-18-1994 Verified version 1.1 */
/* 12-18-1995 Modified TCC_Resume_Service, */
/* resulting in version 1.1+ */
/* (SPR 36, 64, 66, 77) */
/* 04-17-1996 updated to version 1.2 */
/* 06-01-1996 Modified TCC_Suspend_Task */
/* (SPR152) creating version 1.2a */
/* 10-29-1997 Modified TCC_Resume_Task */
/* (SPR115) creating vresion 1.2b */
/* 01-23-1998 Released version 1.2b */
/* 03-20-1998 Corrected problem where tasks */
/* created with NU_NO_PREEMPT in */
/* Application_Initialize would */
/* start in the order of creation */
/* and not in priority order. */
/* SPR455 creates version 1.2c */
/* 03-24-1998 Released version 1.3. */
/* 10-02-1998 Another protect problem (1.3a) */
/* 10-02-1998 Corrected a problem where a */
/* a timer expiration occurs */
/* during signal handler execution */
/* and causes the task to never */
/* run again (SPR 923) creating */
/* version 1.3b. */
/* */
/*************************************************************************/
#define NU_SOURCE_FILE
#include "in_defs.h" /* Initialization defines */
#include "cs_extr.h" /* Common service functions */
#include "tc_extr.h" /* Thread control functions */
#include "in_extr.h" /* Initialization/Interrupt */
/* functions */
#include "tm_extr.h" /* Timer control functions */
#include "er_extr.h" /* Error handling function */
#include "hi_extr.h" /* History functions */
/* Define external inner-component global data references. */
extern INT INC_Initialize_State;
extern CS_NODE *TCD_Created_Tasks_List;
extern UNSIGNED TCD_Total_Tasks;
extern TC_TCB *TCD_Priority_List[TC_PRIORITIES];
extern UNSIGNED TCD_Priority_Groups;
extern DATA_ELEMENT TCD_Sub_Priority_Groups[TC_MAX_GROUPS];
extern UNSIGNED_CHAR TCD_Lowest_Set_Bit[];
extern INT TCD_Highest_Priority;
extern TC_TCB *TCD_Execute_Task;
extern VOID *TCD_Current_Thread;
extern UNSIGNED_CHAR TCD_Registered_LISRs[NU_MAX_VECTORS];
extern VOID (*TCD_LISR_Pointers[NU_MAX_LISRS])(INT vector);
extern INT TCD_Interrupt_Count;
extern INT TCD_Stack_Switched;
extern TC_PROTECT TCD_List_Protect;
extern TC_PROTECT TCD_System_Protect;
extern TC_PROTECT TCD_LISR_Protect;
extern CS_NODE *TCD_Created_HISRs_List;
extern UNSIGNED TCD_Total_HISRs;
extern TC_PROTECT TCD_HISR_Protect;
extern INT TCD_Unhandled_Interrupt;
/* Define external inner-component function calls that are not available to
other components. */
VOID TCT_Build_Task_Stack(TC_TCB *task_ptr);
VOID TCT_Build_HISR_Stack(TC_HCB *hisr_ptr);
VOID TCT_Build_Signal_Frame(TC_TCB *task_ptr);
VOID TCT_Protect_Switch(TC_TCB *task);
VOID TCT_Signal_Exit(VOID);
/* Define internal function calls. */
VOID TCC_Signal_Shell(VOID);
/*************************************************************************/
/* */
/* FUNCTION */
/* */
/* TCC_Create_Task */
/* */
/* DESCRIPTION */
/* */
/* This function creates a task and then places it on the list of */
/* created tasks. All the resources necessary to create the task */
/* are supplied to this routine. If specified, the newly created */
/* task is started. Otherwise, it is left in a suspended state. */
/* */
/* AUTHOR */
/* */
/* Accelerated Technology, Inc. */
/* */
/* CALLED BY */
/* */
/* Application */
/* TCCE_Create_Task Error checking shell */
/* */
/* CALLS */
/* */
/* CSC_Place_On_List Add TCB to linked-list */
/* [HIC_Make_History_Entry] Make entry in history log */
/* TCC_Resume_Task Start the created task */
/* TCT_Build_Task_Stack Build an initial task stack */
/* [TCT_Check_Stack] Stack checking function */
/* TCT_Control_To_System Transfer control to system */
/* TCT_Protect Protect created task list */
/* TCT_Unprotect Release protection of list */
/* TMC_Init_Task_Timer Initialize the task's timer */
/* */
/* INPUTS */
/* */
/* task_ptr Task control block pointer */
/* name Task name */
/* task_entry Entry function of the task */
/* argc Optional task parameter */
/* argv Optional task parameter */
/* stack_address Pointer to start of stack */
/* stack_size Size of task stack in bytes */
/* priority Task priority */
/* time_slice Task time slice */
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