tmf.c

nuclues plus 源代码程序

{

CS_NODE         *node_ptr;                  /* Pointer to each TCB       */
UNSIGNED         pointers;                  /* Number of pointers in list*/


#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 timers.  */
    TCT_Protect(&TMD_Created_List_Protect);

    /* Loop until all timer pointers are in the list or until the maximum 
       list size is reached.  */
    node_ptr =  TMD_Created_Timers_List;
    while ((node_ptr) && (pointers < maximum_pointers))
    {
    
        /* Place the node into the destination list.  */
        *pointer_list++ =  (NU_TIMER *) 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 == TMD_Created_Timers_List)
        
            /* The list search is complete.  */
            node_ptr =  NU_NULL;
    } 
                
    /* Release protection against access to the list of created timers.  */
    TCT_Unprotect();

    /* Return the number of pointers in the list.  */
    return(pointers);
}


/*************************************************************************/
/*                                                                       */
/* FUNCTION                                                              */
/*                                                                       */
/*      TMF_Timer_Information                                            */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This function returns information about the specified timer.     */
/*      However, if the supplied timer pointer is invalid, the           */
/*      function simply returns an error status.                         */
/*                                                                       */
/* AUTHOR                                                                */
/*                                                                       */
/*      William E. Lamie, Accelerated Technology, Inc.                   */
/*                                                                       */
/* CALLED BY                                                             */
/*                                                                       */
/*      Application                                                      */
/*                                                                       */
/* CALLS                                                                 */
/*                                                                       */
/*      [TCT_Check_Stack]                   Stack checking function      */
/*      TCT_System_Protect                  Protect active timer         */
/*      TCT_Unprotect                       Release protection           */
/*                                                                       */
/* INPUTS                                                                */
/*                                                                       */
/*      timer_ptr                           Pointer to the timer         */
/*      name                                Destination for the name     */
/*      enable                              Destination for the enable   */
/*                                            posture                    */
/*      expirations                         Destination for the total    */
/*                                            number of expirations      */
/*      id                                  Destination for the timer id */
/*      initial_time                        Destination for the initial  */
/*                                            time                       */
/*      reschedule_time                     Destination for the          */
/*                                            reschedule time            */
/*                                                                       */
/* OUTPUTS                                                               */
/*                                                                       */
/*      NU_SUCCESS                          If a valid timer pointer     */
/*                                            is supplied                */
/*      NU_INVALID_TIMER                    If timer pointer 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        08-09-1993      Corrected problem that caused an */
/*                                        invalid application timer ID   */
/*                                        to be returned to the caller,  */
/*                                        resulting in version 1.0a      */
/*      D. Lamie        08-09-1993      Verified version 1.0a            */
/*      W. Lamie        03-01-1994      Changed function interface,      */
/*                                        resulting in version 1.1       */
/*      R. Pfaff -                                                       */
/*      D. Lamie        03-18-1994      Verified version 1.1             */
/*      M. Trippi       11-18-1996      Corrected SPR220.                */
/*                                                                       */
/*************************************************************************/
STATUS  TMF_Timer_Information(NU_TIMER *timer_ptr, CHAR *name, 
                  OPTION *enable, UNSIGNED *expirations, UNSIGNED *id,
                  UNSIGNED *initial_time, UNSIGNED *reschedule_time)
{

TM_APP_TCB     *timer;                      /* Timer control block ptr   */
INT             i;                          /* Working integer variable  */
STATUS          completion;                 /* Completion status         */


    /* Move input timer pointer into internal pointer.  */
    timer =  (TM_APP_TCB *) timer_ptr;


#ifdef  NU_ENABLE_STACK_CHECK

    /* Call stack checking function to check for an overflow condition.  */
    TCT_Check_Stack();

#endif

    /* Protect the active list.  */
    TCT_System_Protect();

    /* Determine if this timer ID is valid.  */
    if ((timer != NU_NULL) && (timer -> tm_id == TM_TIMER_ID))
    {
    
        /* The timer pointer is valid.  Reflect this in the completion
           status and fill in the actual information.  */
        completion =  NU_SUCCESS;
        
        /* Copy the timer's name.  */
        for (i = 0; i < NU_MAX_NAME; i++)
            *name++ =  timer -> tm_name[i];

        /* Determine if the timer is enabled or disabled.  */
        if (timer -> tm_enabled)
        
            *enable =  NU_ENABLE_TIMER;
        else
        
            *enable =  NU_DISABLE_TIMER;

        /* Fill in the remaining information.  */
        *expirations =          timer -> tm_expirations;
        *id =                   timer -> tm_expiration_id;
        *initial_time =         timer -> tm_initial_time;
        *reschedule_time =      timer -> tm_reschedule_time;
    }
    else
    
        /* Indicate that the timer pointer is invalid.   */
        completion =  NU_INVALID_TIMER;

    /* Release protection.  */
    TCT_Unprotect();

    /* Return the appropriate completion status.  */
    return(completion);
}