Outline

Wait for eventflag (polling).

C format

 ER      pol_flg (ID flgid, FLGPTN waiptn, MODE wfmode, FLGPTN *p_flgptn);

 ER      ipol_flg (ID flgid, FLGPTN waiptn, MODE wfmode, FLGPTN *p_flgptn);

Parameter(s)

I/O	Parameter	Description
I	ID flgid;	ID number of the eventflag to wait for.
I	FLGPTN waiptn;	Wait bit pattern.
I	MODE wfmode;	Wait mode. TWF_ANDW: AND waiting condition. TWF_ORW: OR waiting condition.
O	FLGPTN *p_flgptn;	Bit pattern causing a task to be released from waiting.

Explanation

This service call checks whether the bit pattern specified by parameter waiptn and the bit pattern that satisfies the required condition specified by parameter wfmode are set to the eventflag specified by parameter flgid.

If the bit pattern that satisfies the required condition has been set to the target eventflag, the bit pattern of the target eventflag is stored in the area specified by parameter p_flgptn.

If the bit pattern of the target eventflag does not satisfy the required condition when this service call is issued, "E_TMOUT" is returned.

The following shows the specification format of required condition wfmode.

- wfmode = TWF_ANDW
Checks whether all of the bits to which 1 is set by parameter waiptn are set as the target eventflag.

- wfmode = TWF_ORW
Checks which bit, among bits to which 1 is set by parameter waiptn, is set as the target eventflag.

Note 1 With the RI850V4, whether to enable queuing of multiple tasks to the event flag wait queue is defined during configuration. If this service call is issued for the event flag (TW_WSGL attribute) to which a wait task is queued, therefore, "E_ILUSE" is returned regardless of whether the required condition is immediately satisfied.

TA_WSGL: Only one task is allowed to be in the WAITING state for the eventflag.

TA_WMUL: Multiple tasks are allowed to be in the WAITING state for the eventflag.

Note 2 The RI850V4 performs bit pattern clear processing (0x0 setting) when the required condition of the target eventflag (TA_CLR attribute) is satisfied.

Note 3 If the bit pattern of the target event flag does not satisfy the required condition when this service call is issued, the contents in the area specified by parameter p_flgptn become undefined.

Return value

Macro	Value	Description
E_OK	0	Normal completion.
E_PAR	-17	Parameter error. - waiptn = 0x0 - wfmode is invalid.
E_ID	-18	Invalid ID number. - flgid < 0x0 - flgid > Maximum ID number
E_CTX	-25	Context error. - This service call was issued in the CPU locked state.
E_ILUSE	-28	Illegal service call use. - There is already a task waiting for an eventflag with the TA_WSGL attribute.
E_NOEXS	-42	Non-existent object. - Specified eventflag is not registered.
E_TMOUT	-50	Polling failure. - The bit pattern of the target eventflag does not satisfy the wait condition.