T-Kernel Specification (1.B0.02)

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160 CHAPTER 4. T-KERNEL/OS FUNCTIONS The queuing order of tasks waiting for memory block allocation is either FIFO or task priority order, depending on the memory pool attribute. Copyright c○ 2002, 2003 by T-Engine Forum T-Kernel 1.B0.02
4.6. MEMORY POOL MANAGEMENT FUNCTIONS 161 tk rel mpl Release Variable-size Memory Block [C Language Interface] ER ercd = tk_rel_mpl ( ID mplid, VP blk ) ; [Parameters] ID mplid Variable-size memory pool ID VP blf Memory block start address [Return Parameters] ER ercd Error code [Error Codes] E OK E ID E NOEXS E PAR Normal completion Invalid ID number (mplid is invalid or cannot be used) Object does not exist (the variable-size memory pool designated in mplid does not exist) Parameter error (blk is invalid, or block returned to wrong memory pool) [Description] Returns the memory block designated in blk to the variable-size memory pool designated in mplid. Executing tk rel mpl may enable memory block acquisition by another task waiting to allocate memory from the memory pool designated in mplid, releasing the WAIT state of that task. When a memory block is returned to a variable-size memory pool, it must be the same variable-size memory pool from which the block was allocated. If an attempt to return a memory block to a different memory pool is detected, error code E PAR is returned. Whether this error detection is made or not is implementation-dependent. [Additional Notes] When memory is returned to a variable-size memory pool in which multiple tasks are queued, multiple tasks may be released at the same time depending on the amount of memory returned and their requested memory size. The task precedence among tasks of the same priority after their WAIT state is released in such a case is the order in which they were queued. 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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4.1. TASK MANAGEMENT FUNCTIONS 29 #
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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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4.5. EXTENDED SYNCHRONIZATION AND C
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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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