T-Kernel Specification (1.B0.02)

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178 CHAPTER 4. T-KERNEL/OS FUNCTIONS #define TA_ASM 0x00000000 /* assembly program */ #define TA_HLNG 0x00000001 /* high-level language program */ almhdr designates the alarm handler start address. When the TA HLNG attribute is designated, the alarm handler is started via a high-level language support routine. The high-level language support routine takes care of saving and restoring register values. The alarm handler terminates by a simple return from a function. The alarm handler takes the following format when the TA HLNG attribute is designated. void almhdr( VP exinf ) { /* Processing */ } return; /* exit alarm handler */ The alarm handler format when the TA ASM attribute is designated is implementation-dependent, but exinf must be passed in a starting parameter. Even if a system call is invoked from an alarm handler and this causes the task in RUN state up to that time to go to another state, with a different task going to RUN state, dispatching (task switching) does not occur while the alarm handler is running. Completion of execution by the alarm handler has precedence even if dispatching is necessary; only when the alarm handler terminates does the dispatch take place. In other words, a dispatch request occurring while an alarm handler is running is not processed immediately, but is delayed until the alarm handler terminates. This is called delayed dispatching. An alarm handler runs as a task-independent portion. As such, it is not possible to call in an alarm handler a system call that can enter WAIT state, or one that is intended for the invoking task. [Additional Notes] When multiple time event handlers or interrupt handlers operate at the same time, it is an implementationdependent matter whether to have them run serially (after one handler exits, another starts) or nested (one handler operation is suspended, another runs, and when that one finishes the previous one resumes). In either case, since time event handlers and interrupt handlers run as task-independent portion, the principle of delayed dispatching applies. Copyright c○ 2002, 2003 by T-Engine Forum T-Kernel 1.B0.02
4.7. TIME MANAGEMENT FUNCTIONS 179 tk del alm Delete Alarm Handler [C Language Interface] ER ercd = tk_del_alm ( ID almid ) ; [Parameters] ID almid Alarm handler ID [Return Parameters] ER ercd Error code [Error Codes] E OK E ID E NOEXS Normal completion Invalid ID number (almid is invalid or cannot be used) Object does not exist (the alarm handler designated in almid does not exist) [Description] Deletes an alarm handler. 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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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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