Outline

Acquire fixed-sized memory block (polling).

C format

 ER      pget_mpf (ID mpfid, VP *p_blk);

 ER      ipget_mpf (ID mpfid, VP *p_blk);

Parameter(s)

I/O	Parameter	Description
I	ID mpfid;	ID number of the fixed-sized memory pool.
O	VP *p_blk;	Start address of the acquired memory block.

Explanation

This service call acquires the fixed-sized memory block from the fixed-sized memory pool specified by parameter mpfid and stores the start address in the area specified by parameter p_blk.

If a fixed-sized memory block could not be acquired from the target fixed-sized memory pool (no available fixed-sized memory blocks exist) when this service call is issued, fixed-sized memory block acquisition processing is not performed but "E_TMOUT" is returned.

Note 1 The contents of the block are undefined.

Note 2 The alignment number of memory block is 1. Please perform the following, in order to enlarge the alignment number of memory blocks.

- Specify the memory block size to a multiple of the desired alignment number at creating the fixed-sized memory pool.

- Make the start address of the fixed-sized memory pool area into the address of the desired alignment number.

Return value

Macro	Value	Description
E_OK	0	Normal completion.
E_PAR	-17	Parameter error. - p_blk == NULL
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. - This service call was issued in the status "PSW.IPL > kernel interrupt mask level". Note When the ipget_mpf is issued from task or the pget_mpf is issued from non-task, the context error is not detected and normal operation of the system is not guaranteed.
E_MACV	-26	Memory access violation. (only for pget_mpf) - Stack pointer points out of user stack for invoking task. - The operand-write access to the area indicated by p_blk has not been permitted to the invoking task.
E_NOEXS	-42	Non-existent object. - The fixed-sized memory pool specified by mpfid does not exist.
E_TMOUT	-50	Polling failure.