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 to which the memory block is released.
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.

Note 1 The RI850V4 does not perform memory clear processing when returning the acquired fixed-size memory block. The contents of the returned fixed-size memory block are therefore undefined.

Note 2 When returning fixed-size memory blocks, be sure to issue either of these service calls for the acquired fixed-size memory pools. If the service call is issued for another fixed-size memory pool, no error results but the operation is not guaranteed after that.

Return value

Macro	Value	Description
E_OK	0	Normal completion.
E_ID	-18	Invalid ID number. - mpfid < 0x0 - mpfid > 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 fixed-sized memory pool is not registered.