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pget_mpl

ipget_mpl

Outline
Acquire variable-sized memory block (polling).
C format
 ER      pget_mpl (ID mplid, UINT blksz, VP *p_blk);
 ER      ipget_mpl (ID mplid, UINT blksz, VP *p_blk);
Parameter(s)
I/O
Parameter
Description
I
 ID      mplid;
ID number of the variable-sized memory pool.
I
 UINT    blksz;
Memory block size to be acquired (in bytes).
O
 VP      *p_blk;
Start address of the acquired memory block.

Explanation
This service call acquires a variable-size memory block of the size specified by parameter blksz from the variable-size memory pool specified by parameter mplid, and stores its start address into the area specified by parameter p_blk.
If no variable-size memory blocks could be acquired from the target variable-size memory pool (no successive areas equivalent to the requested size were available) when this service call is issued, this service call does not acquire variable-size memory block but returns "E_TMOUT".
Note 1 For the size of the memory block, refer to "9.3.1 Size of Variable-sized memory block".
Note 2 The contents of the block are undefined.
Note 3 The alignment number of memory blocks changes with creation method of the variable-sized memory pool.
- Created by system configuration file
The alignment number is 1. To enlarge the alignment number to 4, specify unique section to Section name assigned to the memory pool area (mpl_section) in Variable-sized Memory Pool Information (variable_memorypool[]) and locate the section to 4-bytes boundary address when linking.
- Created by cre_mpl or acre_mpl
The alignment number is 4.
Return value
Macro
Value
Description
E_OK
0
Normal completion.
E_PAR
-17
Parameter error.
- blksz == 0
- blksz exceeds the maximum size that can be acquired.
- p_blk == NULL
E_ID
-18
Invalid ID number.
- mplid < 0
- mplid > VTMAX_MPL
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_mpl is issued from task or the pget_mpl 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_mpl)
- 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 variable-sized memory pool specified by mplid does not exist.
E_TMOUT
-50
Polling failure.