Outline

Release fixed-sized memory block.

C format

 ER      rel_mpf (ID mpfid, VP blk);

 ER      irel_mpf (ID mpfid, VP blk);

Parameter(s)

I/O	Parameter	Description
I	ID mpfid;	ID number of the fixed-sized memory pool.
I	VP blk;	Start address of the memory block to be released.

Explanation

This service call returns the fixed-sized memory block specified by parameter blk to the fixed-sized memory pool specified by parameter mpfid.

If a task is queued to the target fixed-sized memory pool wait queue when this service call is issued, fixed-sized memory block return processing is not performed but fixed-sized memory blocks are returned to the relevant task (first task of wait queue).

As a result, the relevant task is unlinked from the wait queue and is moved from the WAITING state (WAITING state for a fixed-sized memory block) to the READY state, or from the WAITING-SUSPENDED state to the SUSPENDED state.

Return value

Macro	Value	Description
E_OK	0	Normal completion.
E_PAR	-17	Parameter error. - blk == NULL - blk is illegal.
E_ID	-18	Invalid ID number. - mpfid < 0 - mpfid > VTMAX_MPF
E_CTX	-25	Context error. - This service call was issued in the CPU locked state. - The irel_mpf was issued from task. - The rel_mpf 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. (only for rel_mpf) - Stack pointer points out of user stack for invoking task.
E_NOEXS	-42	Non-existent object. - The fixed-sized memory pool specified by mpfid does not exist.