UC/OS-II kernel Architecture Analysis (6)-uC/OS-II Memory Management

1. Basic principles of mempart

UC/OS-II divides memory space into multiple memory partitions as needed, each of which consists of memory blocks of the same size. It is mainly included in the C source file OS _mem.c.

• OS _ext OS _mem osmemtbl [OS _max_mem_part];
• OS _ext OS _mem * osmemfreelist;
• Mempart control block struct:

Typedef struct OS _men {

Void * osmemaddr ;//First address

Void * osmemfreelist ;//Start address of the free space in the Partition

Int32u osmemblksize ;//Size of the block member space in the Partition

Int32u osmemnblks ;//Number of Block Structures

Int32u osmemnfree ;//Number of remaining idle Blocks

Int8u osmemname [];

} OS _mem;

 

2. mempart management functions

• OS _mem * osmemcreate (void * ADDR, int32u nblks,

Int32u blksize, int8u * ERR );

• Void * osmemget (OS _mem * pmem, int8u * ERR );//Apply for memory partition Blocks
• Int8u osmemput (OS _mem * pmem, void * pblk );//Release memory partition Blocks
• Int8u osmemquery (OS _mem * pmem, OS _mem_data *);
• Int8u osmemnameget (OS _mem * pmem, int8u * pname, int8u * ERR );
• Int8u osmemnameset (OS _mem * pmem, int8u * pname, int8u * ERR );

3. Several Questions about mempart

(1) Can I apply for a heap space of 1 B at a time?

(2) uC/OS-II stack space and stack space when applying for what is different?