?? tmf.c
字號:
/*************************************************************************/
/* */
/* 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. */
/* */
/* 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 */
/* */
/* DATE REMARKS */
/* */
/* 03-01-1993 Created initial version 1.0 */
/* 04-19-1993 Verified version 1.0 */
/* 08-09-1993 Corrected problem that caused an */
/* invalid application timer ID */
/* to be returned to the caller, */
/* resulting in version 1.0a */
/* 08-09-1993 Verified version 1.0a */
/* 03-01-1994 Changed function interface, */
/* resulting in version 1.1 */
/* */
/* 03-18-1994 Verified version 1.1 */
/* 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 */
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
/* 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 to user mode */
NU_USER_MODE();
/* Return the appropriate completion status. */
return(completion);
}
/*************************************************************************/
/* */
/* FUNCTION */
/* */
/* TMF_Get_Remaining_Time */
/* */
/* DESCRIPTION */
/* */
/* This function returns the remaining time before expiration for */
/* the specified timer. */
/* */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/* CALLS */
/* */
/* TCT_System_Protect Protect active timer */
/* TCT_Unprotect Release protection */
/* */
/* INPUTS */
/* */
/* timer_ptr Pointer to the timer */
/* */
/* OUTPUTS */
/* */
/* remaining_time time until timer expiration */
/* */
/* NU_INVALID_TIMER If timer pointer invalid */
/* */
/* HISTORY */
/* */
/* DATE REMARKS */
/* */
/* 07-02-1998 Created service call */
/* */
/*************************************************************************/
STATUS TMF_Get_Remaining_Time(NU_TIMER *timer_ptr, UNSIGNED *remaining_time)
{
R1 TM_APP_TCB *timer;
TM_TCB *real_TCB;
TM_TCB *list_ptr;
INT done = 0;
STATUS status;
NU_SUPERV_USER_VARIABLES
/* Switch to supervisor mode */
NU_SUPERVISOR_MODE();
/* Protect against simultaneous access to the active timers list*/
TCT_System_Protect();
list_ptr = TMD_Active_Timers_List;
/* Get the application timer Control Block */
timer = (TM_APP_TCB*) timer_ptr;
/* 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. */
status = NU_SUCCESS;
/* Get the actual timer Control block */
real_TCB = &(timer->tm_actual_timer);
if (list_ptr == real_TCB)
*remaining_time = list_ptr -> tm_remaining_time;
else
{
if( list_ptr == NU_NULL) /* in case no active timers exist */
*remaining_time = 0;
else
{
*remaining_time = list_ptr -> tm_remaining_time;
do
{
/* Move the list pointer to the next timer in the list. */
list_ptr = list_ptr -> tm_next_timer;
*remaining_time += list_ptr -> tm_remaining_time;
/* Check to see if we have gotten to the specified timer yet */
if (list_ptr == real_TCB)
/* Searching is done. */
done = NU_TRUE;
}while (!done);
}
}
}
else
/* Indicate that the timer pointer is invalid. */
status = NU_INVALID_TIMER;
TCT_Unprotect();
/* Return to user mode */
NU_USER_MODE();
return (status);
}
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