- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄373335 > RX4000V4 RX4000(uITRON4.0) Basics User＇s Manual | User＇s Manual[02/2003] PDF資料下載
參數(shù)資料
| 型號： | RX4000V4 |
| 英文描述： | RX4000(uITRON4.0) Basics User＇s Manual | User＇s Manual[02/2003] |
| 中文描述： | RX4000（uITRON4.0）基礎(chǔ)用戶手冊|用戶手冊[02/2003] |
| 文件頁數(shù)： | 70/309頁 |
| 文件大?。?/td> | 1684K |
| 代理商： | RX4000V4 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁當(dāng)前第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁第169頁第170頁第171頁第172頁第173頁第174頁第175頁第176頁第177頁第178頁第179頁第180頁第181頁第182頁第183頁第184頁第185頁第186頁第187頁第188頁第189頁第190頁第191頁第192頁第193頁第194頁第195頁第196頁第197頁第198頁第199頁第200頁第201頁第202頁第203頁第204頁第205頁第206頁第207頁第208頁第209頁第210頁第211頁第212頁第213頁第214頁第215頁第216頁第217頁第218頁第219頁第220頁第221頁第222頁第223頁第224頁第225頁第226頁第227頁第228頁第229頁第230頁第231頁第232頁第233頁第234頁第235頁第236頁第237頁第238頁第239頁第240頁第241頁第242頁第243頁第244頁第245頁第246頁第247頁第248頁第249頁第250頁第251頁第252頁第253頁第254頁第255頁第256頁第257頁第258頁第259頁第260頁第261頁第262頁第263頁第264頁第265頁第266頁第267頁第268頁第269頁第270頁第271頁第272頁第273頁第274頁第275頁第276頁第277頁第278頁第279頁第280頁第281頁第282頁第283頁第284頁第285頁第286頁第287頁第288頁第289頁第290頁第291頁第292頁第293頁第294頁第295頁第296頁第297頁第298頁第299頁第300頁第301頁第302頁第303頁第304頁第305頁第306頁第307頁第308頁第309頁
CHAPTER 6 MEMORY MANAGEMENT
User’s Manual U14833EJ2V0UM
70
6.3
Stack Pool
The stack pool is used to secure the interrupt stack area used by interrupt service routines, etc., and the task stack
area provided for each task.
Dynamic creation/deletion of the interrupt stack is assumed not to occur during system operation, and because the
stack size is determined according to a description in the CF definition file, the interrupt stack area is statically secured
as an undeletable area at kernel initialization.
Sections from the stack pool other than the area for the interrupt stack are initialized as a single large variable-
length memory pool controlled by the kernel. When a task is created, a memory block secured from this memory pool
is assigned to the task as a stack. When a task is deleted, the stack area is returned to this memory pool.
Note that this memory pool cannot be directly accessed from a task or handler processing program via a service
call.
6.4
User Pool
The user pool is used to secure the main body of the fixed-length and variable-length memory pools and the ring
buffer area used for the data queue.
The user pool is initialized as a single large variable-length memory pool from which memory blocks are secured in
memory pool or ring buffer sized portions when a fixed-length memory pool, variable-length memory pool, or data
queue is created. The secured memory blocks are assigned to objects created as the main body of a fixed-length
memory pool.
Note that this memory pool (user pool) cannot be directly accessed from a task or handler processing program via
a service call.
6.5
Fixed-Length Memory Pools
These are memory pools from which memory blocks can be repeatedly acquired and returned by a task or handler
processing program via a service call. Unlike a variable-length memory pool, the size of the memory blocks that can
be acquired is fixed for each memory pool, enabling more simple and faster access by the processing.
6.5.1
Creating fixed-length memory pools
A fixed-length memory pool is created by issuing the service call (a)cre_mpf. When acre_mpf is issued, the ID
number of the memory pool can be assigned by the kernel. Also, specifying the static API CRE_MPF allows
processing equivalent to cre_mpf to be carried out at kernel initialization.
When (a)cre_mpf is issued, an area of the specified size is secured from the user pool and becomes the memory
pool main body. If this area is successfully secured, data such as the attribute and the address of the memory pool
main body area is stored in the fixed-length memory control block corresponding to the specified ID number, and the
area is initialized.
6.5.2
Deleting fixed-length memory pools
A fixed-length memory pool is deleted by issuing the service call del_mpf. When del_mpf is issued, the kernel
returns the area of the memory pool main body to the user pool and then invalidates the control block. At this time, if
there is a task waiting to acquire a memory block from the fixed-length memory pool to be deleted, all tasks are
released from the waiting state. For tasks released from waiting, the error code E_DLT is returned indicating that the
memory pool was deleted.
Note that even if there are parts of memory blocks in the target fixed-length memory pool that have not been
returned, the fixed-length memory pool will still be deleted. Care is required at this time because the task or handler
that had acquired that memory block is not informed of the deletion of the memory pool.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| RX4575LC | Real Time Clock Module |
| RX4756 | Analog IC |
| RX5500-1 | Analog IC |
| RX5501 | Telecomm/Datacomm |
| RX5VL-E | 低功耗電壓檢測 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RX-401 | 功能描述:烙鐵 SOLDERING TIP RoHS:否 制造商:Weller 產(chǎn)品:Soldering Stations 類型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大溫度:+ 850 F 電纜類型:US Cord Included |
| RX401-16 | 制造商:NTE 制造商全稱:NTE Electronics 功能描述:MATERIAL SAFETY DATA SHEET |
| RX-402 | 功能描述:烙鐵 SOLDERING TIP RoHS:否 制造商:Weller 產(chǎn)品:Soldering Stations 類型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大溫度:+ 850 F 電纜類型:US Cord Included |
| RX-404 | 功能描述:烙鐵 SOLDERING TIP RoHS:否 制造商:Weller 產(chǎn)品:Soldering Stations 類型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大溫度:+ 850 F 電纜類型:US Cord Included |
| RX4040-0 | 制造商:Richco 功能描述:Duct;Flex;Screw Mnt;Gry;40MM Hold 制造商:Richco 功能描述:DUCT FLEX SCREW MNT 40MM HOLD |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。