ref_tst

iref_tst

Outline

Reference task state (simplified version).

C format

 ER      ref_tst (ID tskid, T_RTST *pk_rtst);
 ER      iref_tst (ID tskid, T_RTST *pk_rtst);
Parameter(s)

I/O

Parameter

Description

I

 ID      tskid;
ID number of the task.

TSK_SELF: Invoking task.

Value: ID number of the task.

O

 T_RTST  *pk_rtst;
Pointer to the packet returning the task state.



[Task state packet (simplified version): T_RTST]

 typedef struct  t_rtst {
     STAT    tskstat;        /*Current state*/
     STAT    tskwait;        /*Reason for waiting*/
 } T_RTST;


Explanation

Stores task state packet (current state, reason for waiting) of the task specified by parameter tskid in the area specified by parameter pk_rtst.

Used for referencing only the current state and reason for wait among task information.

Response becomes faster than using ref_tsk or iref_tsk because only a few information items are acquired.

- tskstat
Stores the current state.


TTS_RUN: RUNNING state

TTS_RDY: READY state

TTS_WAI: WAITING state

TTS_SUS: SUSPENDED state

TTS_WAS: WAITING-SUSPENDED state

TTS_DMT: DORMANT state

- tskwait
Stores the reason for waiting.
The tskwait is effective only when the tskstat is TTS_WAI or TTS_WAS.



TTW_SLP: Sleeping state caused by slp_tsk or tslp_tsk

TTW_DLY: Delayed state caused by dly_tsk

TTW_SEM: WAITING state for a semaphore resource caused by wai_sem or twai_sem

TTW_FLG: WAITING state for an eventflag caused by wai_flg or twai_flg

TTW_SDTQ: Sending WAITING state for a data queue caused by snd_dtq or tsnd_dtq

TTW_RDTQ: Receiving WAITING state for a data queue caused by rcv_dtq or trcv_dtq

TTW_MBX: Receiving WAITING state for a mailbox caused by rcv_mbx or trcv_mbx

TTW_MTX: WAITING state for a mutex caused by loc_mtx or tloc_mtx

TTW_SMBF: Sending WAITING state for a message buffer caused by snd_mbf or tsnd_mbf

TTW_RMBF: Receiving WAITING state for a message buffer caused by rcv_mbf or trcv_mbf

TTW_MPF: WAITING state for a fixed-sized memory block caused by get_mpf or tget_mpf

TTW_MPL: WAITING state for a variable-sized memory block caused by get_mpl or tget_mpl

Return value

Macro

Value

Description

E_OK

0

Normal completion.

E_ID

-18

Invalid ID number.

- tskid < 0

- tskid > VTMAX_TSK

- When this service call was issued from a non-task, TSK_SELF was specified for tskid.

E_CTX

-25

Context error.

- This service call was issued in the CPU locked state.

- This service call was issued in the status "PSW.IPL > kernel interrupt mask level".

Note When the iref_tst is issued from task or the ref_tst is issued from non-task, the context error is not detected and normal operation of the system is not guaranteed.