TCT_Unprotect();

    /* Determine if the timer should be enabled.  */
    if (enable == NU_ENABLE_TIMER)

        /* Activate the timer.  */
        TMS_Control_Timer(timer_ptr, NU_ENABLE_TIMER);

    /* Return to user mode */
    NU_USER_MODE();

    /* Return successful completion.  */
    return(NU_SUCCESS);
}


/*************************************************************************/
/*                                                                       */
/* FUNCTION                                                              */
/*                                                                       */
/*      TMS_Delete_Timer                                                 */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This function deletes an application timer and removes it from   */
/*      the list of created timers.                                      */
/*                                                                       */
/* CALLED BY                                                             */
/*                                                                       */
/*      Application                                                      */
/*      TMSE_Delete_Timer                   Error checking shell         */
/*                                                                       */
/* CALLS                                                                 */
/*                                                                       */
/*      CSC_Remove_From_List                Remove node from list        */
/*      [HIC_Make_History_Entry]            Make entry in history log    */
/*      [TCT_Check_Stack]                   Stack checking function      */
/*      TCT_Protect                         Protect created list         */
/*      TCT_System_Protect                  Protect active list          */
/*      TCT_Unprotect                       Release protection           */
/*                                                                       */
/* INPUTS                                                                */
/*                                                                       */
/*      timer_ptr                           Timer control block pointer  */
/*                                                                       */
/* OUTPUTS                                                               */
/*                                                                       */
/*      NU_NOT_DISABLED                     Timer not disabled first     */
/*      NU_SUCCESS                                                       */
/*                                                                       */
/* HISTORY                                                               */
/*                                                                       */
/*         DATE                    REMARKS                               */
/*                                                                       */
/*      03-01-1993      Created initial version 1.0                      */
/*      04-19-1993      Verified version 1.0                             */
/*      03-01-1994      Modified protection logic to use                 */
/*                        system protection, changed                     */
/*                        function prototype, resulting                  */
/*                        in version 1.1                                 */
/*                                                                       */
/*      03-18-1994      Verified version 1.1                             */
/*                                                                       */
/*************************************************************************/
STATUS  TMS_Delete_Timer(NU_TIMER *timer_ptr)
{

TM_APP_TCB     *timer;                      /* Timer control block ptr  */
STATUS          status;                     /* Completion status        */
NU_SUPERV_USER_VARIABLES

    /* Switch to supervisor mode */
    NU_SUPERVISOR_MODE();

    /* 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

#ifdef  NU_ENABLE_HISTORY

    /* Make an entry that corresponds to this function in the system history
       log.  */
    HIC_Make_History_Entry(NU_DELETE_TIMER_ID, (UNSIGNED) timer,
                                        (UNSIGNED) 0, (UNSIGNED) 0);

#endif

    /* Initialize the status.  */
    status =  NU_SUCCESS;

    /* Use system protect to protect the active timer list temporarily.  */
    TCT_System_Protect();

    /* Determine if the timer is currently disabled. */
    if (timer -> tm_enabled)
    {
        /* Error, indicate to the caller that the timer is currently active. */
        status =  NU_NOT_DISABLED;

#ifdef INCLUDE_PROVIEW
        _RTProf_DumpTimer(RT_PROF_DELETE_TIMER,timer,RT_PROF_FAIL);
#endif

    }
    else
    {
        /* Clear the timer ID.  */
        timer -> tm_id =  0;

#ifdef INCLUDE_PROVIEW
        _RTProf_DumpTimer(RT_PROF_DELETE_TIMER,timer,RT_PROF_OK);
#endif /* INCLUDE_PROVIEW */

    }

    /* Release protection.  */
    TCT_Unprotect();

    /* Determine if an error was detected.  */
    if (status == NU_SUCCESS)
    {

        /* Protect against access to the list of created timers.  */
        TCT_Protect(&TMD_Created_List_Protect);

        /* Remove the timer from the list of created timers.  */
        CSC_Remove_From_List(&TMD_Created_Timers_List, &(timer -> tm_created));

        /* Decrement the total number of created timers.  */
        TMD_Total_Timers--;

        /* Release protection against access to the list of created timers.  */
        TCT_Unprotect();
    }

    /* Return to user mode */
    NU_USER_MODE();

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


/*************************************************************************/
/*                                                                       */
/* FUNCTION                                                              */
/*                                                                       */
/*      TMS_Reset_Timer                                                  */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This function resets the specified application timer.  Note that */
/*      the timer must be in a disabled state prior to this call.  The   */
/*      timer is activated after it is reset if the enable parameter     */
/*      specifies automatic activation.                                  */
/*                                                                       */
/* CALLED BY                                                             */
/*                                                                       */
/*      Application                                                      */
/*      TMSE_Reset_Timer                    Error checking shell         */
/*                                                                       */
/* CALLS                                                                 */
/*                                                                       */
/*      [HIC_Make_History_Entry]            Make entry in history log    */
/*      [TCT_Check_Stack]                   Stack checking function      */
/*      TCT_System_Protect                  Protect active list          */
/*      TCT_Unprotect                       Release protection           */
/*      TMS_Control_Timer                   Enable/disable timer         */
/*                                                                       */
/* INPUTS                                                                */
/*                                                                       */
/*      timer_ptr                           Timer control block pointer  */
/*      expiration_routine                  Timer expiration routine     */
/*      initial_time                        Initial expiration time      */
/*      reschedule_time                     Reschedule expiration time   */
/*      enable                              Automatic enable option      */
/*                                                                       */
/* OUTPUTS                                                               */
/*                                                                       */
/*      NU_NOT_DISABLED                     Timer not disabled first     */
/*      NU_SUCCESS                          Successful completion        */
/*                                                                       */
/* HISTORY                                                               */
/*                                                                       */
/*         DATE                    REMARKS                               */
/*                                                                       */
/*      03-01-1993      Created initial version 1.0                      */
/*      04-19-1993      Verified version 1.0                             */
/*      03-01-1994      Modified protection logic to use                 */
/*                        system protection, changed                     */
/*                        function prototype, resulting                  */
/*                        in version 1.1                                 */
/*                                                                       */
/*      03-18-1994      Verified version 1.1                             */
/*                                                                       */
/*************************************************************************/
STATUS  TMS_Reset_Timer(NU_TIMER *timer_ptr,
                VOID (*expiration_routine)(UNSIGNED),
                UNSIGNED initial_time, UNSIGNED reschedule_time, OPTION enable)
{

R1 TM_APP_TCB  *timer;                      /* Timer control block ptr  */
STATUS          status;                     /* Completion status        */
NU_SUPERV_USER_VARIABLES