ref_sem

iref_sem

Outline

Reference semaphore state.

C format

 ER      ref_sem (ID semid, T_RSEM *pk_rsem);

 ER      iref_sem (ID semid, T_RSEM *pk_rsem);

Parameter(s)

I/O	Parameter	Description
I	ID semid;	ID number of the semaphore to be referenced.
O	T_RSEM *pk_rsem;	Pointer to the packet returning the semaphore state.

[Semaphore state packet: T_RSEM]

typedef struct t_rsem { ID wtskid; /*Existence of waiting task*/ UINT semcnt; /*Current resource count*/ ATR sematr; /*Attribute*/ UINT maxsem; /*Maximum resource count*/ } T_RSEM;

Explanation

Stores semaphore state packet (ID number of the task at the head of the wait queue, current resource count, etc.) of the semaphore specified by parameter semid in the area specified by parameter pk_rsem.

Note For details about the semaphore state packet, refer to "15.2.3 Semaphore state packet".

Return value

Macro	Value	Description
E_OK	0	Normal completion.
E_ID	-18	Invalid ID number. - semid < 0x0 - semid > Maximum ID number
E_CTX	-25	Context error. - This service call was issued in the CPU locked state.
E_NOEXS	-42	Non-existent object. - Specified semaphore is not registered.