tcce.c

nuclues plus 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          */
/*                                                                       */
/*      tcce.c                                          PLUS  1.2        */
/*                                                                       */
/* COMPONENT                                                             */
/*                                                                       */
/*      TC - Thread Control                                              */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This file contains error checking routines for the functions in  */
/*      the Thread Control component.  This permits easy removal of      */
/*      error checking logic when it is not needed.                      */
/*                                                                       */
/* AUTHOR                                                                */
/*                                                                       */
/*      William E. Lamie, Accelerated Technology, Inc.                   */
/*                                                                       */
/* DATA STRUCTURES                                                       */
/*                                                                       */
/*      None                                                             */
/*                                                                       */
/* FUNCTIONS                                                             */
/*                                                                       */
/*      TCCE_Create_Task                    Create a task                */
/*      TCCE_Create_HISR                    Create HISR                  */
/*      TCCE_Delete_HISR                    Delete HISR                  */
/*      TCCE_Delete_Task                    Delete a task                */
/*      TCCE_Reset_Task                     Reset a task                 */
/*      TCCE_Terminate_Task                 Terminate a task             */
/*      TCCE_Resume_Service                 Resume a task service call   */
/*      TCCE_Suspend_Service                Suspend a task service call  */
/*      TCCE_Relinquish                     Relinquish task execution    */
/*      TCCE_Task_Sleep                     Task sleep request           */
/*      TCCE_Suspend_Error                  Check for suspend req error  */
/*      TCCE_Activate_HISR                  Activate an HISR             */
/*      TCCE_Validate_Resume                Validates resume requests    */
/*                                                                       */
/* DEPENDENCIES                                                          */
/*                                                                       */
/*      tc_extr.h                           Thread Control functions     */
/*                                                                       */
/* 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 logic that checked task */
/*                                        status without protection of   */
/*                                        scheduling structures,         */
/*                                        resulting in version 1.0a      */
/*      D. Lamie        03-01-1994      Verified version 1.0a            */
/*      W. Lamie        03-01-1994      Moved non-core error checking    */
/*                                        functions to a supplemental    */
/*                                        file, and modified function    */
/*                                        interfaces, added validate     */
/*                                        resume service, resulting in   */
/*                                        version 1.1                    */
/*      R. Pfaff -                                                       */
/*      D. Lamie        03-18-1994      Verified version 1.1             */
/*	B. Sellew	03-19-1996	Added error checking to          */
/*					  TCCE_Task_Sleep, resulting     */
/*					  in version 1.1+ (spr037) 	 */
/*      M.Q. Qian       04-17-1996      updated to version 1.2           */
/*                                                                       */
/*************************************************************************/
#define         NU_SOURCE_FILE


#include        "tc_extr.h"                 /* Thread control functions  */

/* Define external inner-component global data references.  */

extern TC_TCB          *TCD_Execute_Task;
extern VOID            *TCD_Current_Thread;



/*************************************************************************/
/*                                                                       */
/* FUNCTION                                                              */
/*                                                                       */
/*      TCCE_Create_Task                                                 */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This function performs error checking on the parameters supplied */
/*      to the create task function.                                     */
/*                                                                       */
/* AUTHOR                                                                */
/*                                                                       */
/*      William E. Lamie, Accelerated Technology, Inc.                   */
/*                                                                       */
/* CALLED BY                                                             */
/*                                                                       */
/*      Application                                                      */
/*                                                                       */
/* CALLS                                                                 */
/*                                                                       */
/*      TCC_Create_Task                     Actual create task function  */
/*                                                                       */
/* 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              */
/*      preempt                             Task preemptability flag     */
/*      auto_start                          Automatic task start         */
/*                                                                       */
/* OUTPUTS                                                               */
/*                                                                       */
/*      NU_SUCCESS                          Successful request           */
/*      NU_INVALID_TASK                     Task control block pointer   */
/*                                            is NULL                    */
/*      NU_INVALID_ENTRY                    Task entry function is NULL  */
/*      NU_INVALID_MEMORY                   Stack pointer is NULL        */
/*      NU_INVALID_SIZE                     Stack size is too small      */
/*      NU_INVALID_PRIORITY                 Invalid task priority        */
/*      NU_INVALID_PREEMPT                  Invalid preemption selection */
/*      NU_INVALID_START                    Invalid start selection      */
/*                                                                       */
/* 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 function interface,     */
/*                                        added register optimizations,  */
/*                                        resulting in version 1.1       */
/*      R. Pfaff -                                                       */
/*      D. Lamie        03-18-1994      Verified version 1.1             */
/*                                                                       */
/*************************************************************************/
STATUS  TCCE_Create_Task(NU_TASK *task_ptr, CHAR *name, 
          VOID (*task_entry)(UNSIGNED, VOID *), UNSIGNED argc, VOID *argv, 
          VOID *stack_address, UNSIGNED stack_size,
          OPTION priority, UNSIGNED time_slice, 
          OPTION preempt, OPTION auto_start)
{

TC_TCB         *task;                       /* Task control block ptr    */
STATUS          status;                     /* Completion status         */


    /* Move input task control block pointer into internal pointer.  */
    task =  (TC_TCB *) task_ptr;

    /* Check each parameter.  */
    if ((task == NU_NULL) || (task -> tc_id == TC_TASK_ID))
    
        /* Invalid task control block pointer.  */
        status =  NU_INVALID_TASK;

    else if (task_entry == NU_NULL)
    
        /* Invalid task entry function pointer.  */
        status =  NU_INVALID_ENTRY;
        
    else if (stack_address == NU_NULL)
    
        /* Invalid stack starting address.  */
        status =  NU_INVALID_MEMORY;
        
    else if (stack_size < NU_MIN_STACK_SIZE)
    
        /* Invalid stack size.  */
        status =  NU_INVALID_SIZE;
        
    else if (((INT) priority) >= TC_PRIORITIES)
    
        /* Invalid task priority.  */
        status =  NU_INVALID_PRIORITY;

    else if ((preempt != NU_PREEMPT) && (preempt != NU_NO_PREEMPT))
    
        /* Invalid preemption.  */
        status =  NU_INVALID_PREEMPT;
        
    else if ((auto_start != NU_START) && (auto_start != NU_NO_START))
    
        /* Invalid start selection. */
        status =  NU_INVALID_START;
        
    else
    
        /* Call the actual function to create a task.  All the parameters 
           appear to be correct.  */
        status =  TCC_Create_Task(task_ptr, name, task_entry, argc, argv,
         stack_address, stack_size, priority, time_slice, preempt, auto_start);
        
    /* Return completion status.  */
    return(status);
}


/*************************************************************************/
/*                                                                       */
/* FUNCTION                                                              */
/*                                                                       */