ref_mem

Outline

Reference memory object state.

C format

 ER      ref_mem (VP base, T_RMEM *pk_rmem);

Parameter(s)

I/O	Parameter	Description
I	VP base;	Memory object start address.
O	T_RMEM *pk_rmem;	Pointer to the packet returning the mutex state.

[Access permission vector : ACVCT]

typedef struct acvct { ACPTN acptn1; /*Access permission pattern for operand-read*/ ACPTN acptn2; /*Access permission pattern for operand-write*/ ACPTN acptn3; /*Access permission pattern for execution*/ } ACVCT;

[Memory object state packet: T_RMEM]

typedef struct t_rmem { ACVCT acvct; /*Access permission vector*/ } T_RMEM;

Explanation

This service call stores the information of the memory object started from the address specified by parameter base into the area specified by parameter pk_rmem.

The bit N-1 in the access permission pattern shows whether tasks belonging to the domain ID #N can access the memory object. The bit value 1 means "permitted" and 0 means "not permitted".

Return value

Macro	Value	Description
E_OK	0	Normal completion.
E_PAR	-17	parameter error. - pk_rmem == NULL
E_CTX	-25	Context error. - This service call was issued in the CPU locked state. - This service call was issued from non-task. - This service call was issued in the status "PSW.IPL > kernel interrupt mask level".
E_MACV	-26	Memory access violation. - Stack pointer points out of user stack for invoking task. - The operand-write access to the area indicated by pk_rmem has not been permitted to the invoking task
E_NOEXS	-42	Non-existent object. - The memory object started from the address specified by base has already been registered.