T-Kernel Specification (1.B0.02)

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190 CHAPTER 4. T-KERNEL/OS FUNCTIONS 4.9 System Management Functions System management functions are functions for changing and referencing system states. Functions are provided for rotating task precedence in a queue, getting the ID of the task in RUN state, disabling and enabling task dispatching, referencing context and system states, setting low-power mode, and referencing the T-Kernel version. Copyright c○ 2002, 2003 by T-Engine Forum T-Kernel 1.B0.02
4.9. SYSTEM MANAGEMENT FUNCTIONS 191 tk rot rdq Rotate Ready Queue [C Language Interface] ER ercd = tk_rot_rdq ( PRI tskpri ) ; [Parameters] PRI tskpri Task priority [Return Parameters] ER ercd Error code [Error Codes] E OK E PAR Normal completion Parameter error (tskpri is invalid) [Description] Rotates the precedence among tasks having the priority designated in tskpri. This system call changes the precedence of tasks in RUN or READY state having the designated priority, so that the task with the highest precedence among those tasks is given the lowest precedence. By setting tskpri = TPRI RUN = 0, this system call rotates the precedence of tasks having the priority level of the task currently in RUN state. When tk rot rdq is called from an ordinary task, it rotates the precedence of tasks having the same priority as the invoking task. When calling from a cyclic handler or other task-independent portion, it is also possible to call tk rot rdq (tskpri = TPRI RUN). [Additional Notes] If there are no tasks in a run state having the designated priority, or only one such task, the system call completes normally with no operation (no error code is returned). When this system call is issued in dispatch enabled state, designating as the priority either TPRI RUN or the current priority of the invoking task, the precedence of the invoking task will be the lowest among tasks of the same priority. In this way the system call can be used to relinquish execution privilege. In dispatch disabled state, the task with highest precedence among tasks of the same priority is not always the currently executing task. The precedence of the invoking task will therefore not always become the lowest among tasks having the same priority when the above method is used in dispatch disabled state. Examples of tk rot rdq execution are given in Figure 4.9 and Figure 4.10. When this system call is issued in the state shown in Figure 4.9 designating tskpri = 2, the new precedence order becomes that in Figure 4.10, and Task C becomes the executing task. 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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4.4. SYNCHRONIZATION AND COMMUNICAT
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5.3. DEVICE MANAGEMENT FUNCTIONS 24
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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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