T-Kernel Specification (1.B0.02)

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146 CHAPTER 4. T-KERNEL/OS FUNCTIONS 4.6 Memory Pool Management Functions Memory pool management functions provide software-based management of memory pools and memory block allocation. There are fixed-size memory pools and variable-size memory pools, which are considered separate objects and require separate sets of system calls for their operation. Memory blocks allocated from a fixed-size memory pool are all of one fixed size, whereas memory blocks from a variable-size memory pool can be of various sizes. The memory managed by the memory pool management functions is all in system space; there is no T-Kernel function for managing task space memory. Copyright c○ 2002, 2003 by T-Engine Forum T-Kernel 1.B0.02
4.6. MEMORY POOL MANAGEMENT FUNCTIONS 147 4.6.1 Fixed-size Memory Pool A fixed-size memory pool is an object used for dynamic management of fixed-size memory blocks. Functions are provided for creating and deleting a fixed-size memory pool, getting and returning memory blocks in a fixed-size memory pool, and referencing the status of a fixed-size memory pool. A fixed-size memory pool is an object identified by an ID number called a fixed-size memory pool ID. A fixed-size memory pool has a memory space used as the fixed-size memory pool (called a fixedsize memory pool area or simply memory pool area), and a queue for tasks waiting for memory block allocation. A task wanting to allocate a memory block from a fixed-size memory pool that lacks sufficient available memory space goes to WAIT state for fixed-size memory block until memory blocks are returned to the pool. A task in this state is put in the task queue of the fixed-size memory pool. [Additional Notes] When memory blocks of various sizes are needed from fixed-size memory pools, it is necessary to provide multiple memory pools of different sizes. Copyright c○ 2002, 2003 by T-Engine Forum T-Kernel 1.B0.02
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T-Kernel Specification T-Kernel 1.B
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Contents 1 T-Kernel Overview 1 1.1
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CONTENTS v tk set flg (Set Event Fl
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CONTENTS vii 5.2.2 Address Space Ch
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CONTENTS ix td cal que (Reference Q
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List of Figures 1.1 Position of T-K
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List of Tables 2.1 State Transition
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System Call Notation In the parts o
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Index of T-Kernel/OS System Calls T
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INDEX OF T-KERNEL/OS SYSTEM CALLS x
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Index of T-Kernel/SM Extended SVC L
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Index of T-Kernel/DS System Calls T
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Chapter 1 T-Kernel Overview 1.1 Pos
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1.2. SCALABILITY 3 • Middleware m
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Chapter 2 Concepts Underlying the T
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2.2. TASK STATES AND SCHEDULING RUL
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2.2. TASK STATES AND SCHEDULING RUL
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2.3. INTERRUPT HANDLING 11 preceden
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2.5. SYSTEM STATES 13 Transient sta
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2.7. MEMORY 15 which the upper and
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Chapter 3 Common T-Kernel Specifica
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3.2. SYSTEM CALLS 19 /* * Common co
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3.2. SYSTEM CALLS 21 Ordinarily a f
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3.3. HIGH-LEVEL LANGUAGE SUPPORT RO
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Chapter 4 T-Kernel/OS Functions Thi
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4.1. TASK MANAGEMENT FUNCTIONS 27 t
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4.2. TASK-DEPENDENT SYNCHRONIZATION
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4.3. TASK EXCEPTION HANDLING FUNCTI
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4.4. SYNCHRONIZATION AND COMMUNICAT
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4.9. SYSTEM MANAGEMENT FUNCTIONS 19
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4.10. SUBSYSTEM MANAGEMENT FUNCTION
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Chapter 5 T-Kernel/SM Details of th
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5.1. SYSTEM MEMORY MANAGEMENT FUNCT
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5.2. ADDRESS SPACE MANAGEMENT FUNCT
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5.2. ADDRESS SPACE MANAGEMENT FUNCT
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5.3. DEVICE MANAGEMENT FUNCTIONS 22
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5.4. INTERRUPT MANAGEMENT FUNCTIONS
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5.5. IO PORT ACCESS SUPPORT FUNCTIO
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5.7. SYSTEM CONFIGURATION INFORMATI
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5.7. SYSTEM CONFIGURATION INFORMATI
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5.8. SUBSYSTEM AND DEVICE DRIVER ST
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260 CHAPTER 6. T-KERNEL/DS FUNCTION
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284 CHAPTER 7. REFERENCE INT tevptn
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286 CHAPTER 7. REFERENCE ER ercd =
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288 CHAPTER 7. REFERENCE INT ct = t
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290 CHAPTER 7. REFERENCE E OACV ERC
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T-Kernel Specification (1.B0.02)

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