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參數資料
| 型號： | RX78K4 |
| 英文描述： | 78K/IV Series Real-Time OS Fundamental | User＇s Manual[01/1997] |
| 中文描述： | 78K/IV系列實時操作系統(tǒng)的基本|用戶手冊[01/1997] |
| 文件頁數： | 27/96頁 |
| 文件大?。?/td> | 265K |
| 代理商： | RX78K4 |
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CHAPTER 2 BASIC FUNCTIONS OF RX78K/IV
18
2.5
Memory Management
RX78K/IV performs dynamic memory management based on a memory block of fixed size. This means that a
task acquires memory when necessary, and releases it when unnecessary. By using this feature, it is not necessary
to acquire a memory area in advance for even two or more tasks, so that the memory can be efficiently used.
The memory block of RX78K/IV is dynamically acquired by a system call under execution by the system, and is
returned after it has been used and is no longer necessary. If one memory block cannot be acquired, state transition
of a task does not take place, but only an error code is returned. The size of one memory block is fixed to a value
specified on system creation.
Usually, an acquired memory block is used as a message area, in which case the first 2 bytes with the large
model, the first 1 byte with the small model, are used as a queue link area. Therefore, the area that can be used as a
message area is the area excluding link area.
Fig. 2-4 Memory Pool Configuration
Queue area
Queue area
Queue area
Memory block
Queue area
Memory block
Queue area
Memory block
Memory pool
first address
Free block management area
Large model : 4 bytes
Small model : 2 bytes
Large model : 2 bytes
Small model : 1 byte
Size of 1 memory block
=0
(Queue area of last memory block)
Caution
When using a memory block as a message area, please make the size of the memory block a
multiple of 2. Operation is not guaranteed if the size is not a multiple of 2.
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