tcce.c

nuclues plus 源代码程序

/*      TCCE_Create_HISR                                                 */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This function performs error checking on the parameters supplied */
/*      to the create HISR function.                                     */
/*                                                                       */
/* AUTHOR                                                                */
/*                                                                       */
/*      William E. Lamie, Accelerated Technology, Inc.                   */
/*                                                                       */
/* CALLED BY                                                             */
/*                                                                       */
/*      Application                                                      */
/*                                                                       */
/* CALLS                                                                 */
/*                                                                       */
/*      TCC_Create_HISR                     Actual create HISR function  */
/*                                                                       */
/* INPUTS                                                                */
/*                                                                       */
/*      hisr_ptr                            HISR control block pointer   */
/*      name                                HISR name                    */
/*      hisr_entry                          Entry function of the HISR   */
/*      priority                            Task priority                */
/*      stack_address                       Pointer to start of stack    */
/*      stack_size                          Size of HISR stack in bytes  */
/*                                                                       */
/* OUTPUTS                                                               */
/*                                                                       */
/*      NU_INVALID_HISR                     Invalid HISR pointer         */
/*      NU_INVALID_ENTRY                    Invalid HISR entry point     */
/*      NU_INVALID_PRIORITY                 Invalid HISR priority        */
/*      NU_INVALID_MEMORY                   Indicates stack pointer NULL */
/*      NU_INVALID_SIZE                     Indicates stack size is too  */
/*                                            small                      */
/*                                                                       */
/* 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_HISR(NU_HISR *hisr_ptr, CHAR *name, 
                            VOID (*hisr_entry)(VOID), OPTION priority, 
                            VOID *stack_address, UNSIGNED stack_size)
{

TC_HCB         *hisr;                       /* HISR control block ptr    */
STATUS          status;                     /* Completion status         */



    /* Move input HISR pointer into internal pointer.  */
    hisr =  (TC_HCB *) hisr_ptr;

    /* Check each parameter.  */
    if ((hisr == NU_NULL) || (hisr -> tc_id == TC_HISR_ID))
    
        /* Invalid HISR control block pointer.  */
        status =  NU_INVALID_HISR;

    else if (hisr_entry == NU_NULL)
    
        /* Invalid HISR 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_HISR_PRIORITIES)
    
        /* Invalid HISR priority.  */
        status =  NU_INVALID_PRIORITY;

    else
    
        /* Call the actual function to create a HISR.  All the parameters 
           appear to be correct.  */
        status =  TCC_Create_HISR(hisr_ptr, name, hisr_entry, priority,
                                                stack_address, stack_size);
        
    /* Return completion status.  */
    return(status);
}


/*************************************************************************/
/*                                                                       */
/* FUNCTION                                                              */
/*                                                                       */
/*      TCCE_Delete_Task                                                 */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This function performs error checking on the parameters supplied */
/*      to the delete task function.                                     */
/*                                                                       */
/* AUTHOR                                                                */
/*                                                                       */
/*      William E. Lamie, Accelerated Technology, Inc.                   */
/*                                                                       */
/* CALLED BY                                                             */
/*                                                                       */
/*      Application                                                      */
/*                                                                       */
/* CALLS                                                                 */
/*                                                                       */
/*      TCC_Delete_Task                     Actual delete task function  */
/*                                                                       */
/* INPUTS                                                                */
/*                                                                       */
/*      task_ptr                            Task control block pointer   */
/*                                                                       */
/* OUTPUTS                                                               */
/*                                                                       */
/*      NU_SUCCESS                          If successful completion     */
/*      NU_INVALID_TASK                     Task pointer is invalid      */
/*      NU_INVALID_DELETE                   Task not in a finished or    */
/*                                            terminated state           */
/*                                                                       */
/* 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_Delete_Task(NU_TASK *task_ptr)
{

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;

    /* Determine if the supplied task pointer is valid.  */
    if ((task == NU_NULL) || (task -> tc_id != TC_TASK_ID))
    
        /* Invalid task pointer supplied.  */
        status =  NU_INVALID_TASK;

    else if ((task -> tc_status != NU_FINISHED) &&
             (task -> tc_status != NU_TERMINATED))
             
        /* A task that is not in the finished or terminated state cannot
           be deleted.  */
        status =  NU_INVALID_DELETE;

    else
    
        /* Valid task pointer, call the function to delete the task.  */
        status =  TCC_Delete_Task(task_ptr);
        
    /* Return the completion status.  */
    return(status);
}


/*************************************************************************/
/*                                                                       */
/* FUNCTION                                                              */
/*                                                                       */
/*      TCCE_Delete_HISR                                                 */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This function performs error checking on the parameters supplied */
/*      to the delete HISR function.                                     */
/*                                                                       */
/* AUTHOR                                                                */
/*                                                                       */
/*      William E. Lamie, Accelerated Technology, Inc.                   */
/*                                                                       */
/* CALLED BY                                                             */
/*                                                                       */
/*      Application                                                      */
/*                                                                       */
/* CALLS                                                                 */
/*                                                                       */
/*      TCC_Delete_HISR                     Actual delete HISR function  */
/*                                                                       */
/* INPUTS                                                                */
/*                                                                       */
/*      hisr_ptr                            HISR control block pointer   */
/*                                                                       */
/* OUTPUTS                                                               */
/*                                                                       */
/*      NU_INVALID_HISR                     Indicates HISR pointer is    */
/*                                            invalid                    */
/*                                                                       */
/* 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,  */