rel_mpf

irel_mpf

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.