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RX4000V4 Datasheet

  • RX4000V4

  • RX4000(uITRON4.0) Basics User＇s Manual | User＇s Manual[02/...

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CHAPTER 6 MEMORY MANAGEMENT
Figure 6-6. Variable-Length Memory Pool Structure (When Area Divided into Islands)
Variable-length memory
pool control block
MPL
Acqui-
sition
Return
(鈭?)
6.6.5
Acquiring variable-length memory blocks
A memory block is acquired from a variable-length memory pool by issuing one of the service calls get_mpl,
(i)pget_mpl, or tget_mpl.
If there is a request to acquire a memory block, the kernel checks the memory block queue of the target memory
pool. If the queue contains a memory space large enough for acquisition, a memory block of the requested size is
removed from the memory pool and assigned to the task.
Note, however, that because a header for block
management is added to the memory block, the size of the area actually removed from memory pool when a memory
block is acquired is larger than the requested size (see
Figure 6-7).
Figure 6-7. Memory Block Acquisition
Header
Header
16 bytes
Acquisition
Requested size
User鈥檚 Manual U14833EJ2V0UM
77

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