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RX4000V4 Datasheet

  • RX4000V4

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

  • 309頁

  • ETC

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CHAPTER 6 MEMORY MANAGEMENT
(3) Task C issues get_mpl and requests acquisition of a memory block of size c from the memory pool. However,
because the free area is smaller than size c, task C is unable to acquire the requested memory block and is
put into the waiting state.
Memory pool X
Acquisition request
Running state
Task C
Memory pool X
Registration
Control block
Free block
Free size
Acquisition impossible
Control block
b
Control block
a
Control block
a
Control block
b
Control block
Free block
Free size
Waiting state
Task C
(4) Task A issues rel_mpl and returns a memory block (of size a) to the memory pool. The total free size of the
memory pool increases accordingly, but because it is divided into two small memory blocks, the connected
area requested by task C cannot be secured. Task C is therefore put into the waiting state.
Memory pool X
Returned
rel_mpl
Task A
Task A
Running state
Memory pool X
Running state
Control block
Free area
Free size
Waiting state
Task C
Control block
Free area
Free size
Waiting state
Task C
Control block
b
Control block
a
Control block
b
Control block
Free area
a
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User鈥檚 Manual U14833EJ2V0UM

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