T-Kernel Specification (1.B0.02)

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272 CHAPTER 6. T-KERNEL/DS FUNCTIONS td ref sys Reference System Status [C Language Interface] ER ercd = td_ref_sys ( TD_RSYS *pk_rsys ) ; [Parameters] TD RSYS* pk rsys Packet address for returning status information [Return Parameters] ER ercd Error code pk rsys detail: INT sysstat System status ID runtskid ID of current RUN state task ID schedtskid ID of task scheduled to go to RUN state [Error Codes] E OK Normal completion [Description] Gets the system status. This is similar to tk ref sys. Copyright c○ 2002, 2003 by T-Engine Forum T-Kernel 1.B0.02
6.1. KERNEL INTERNAL STATE ACQUISITION FUNCTIONS 273 td get tim Get System Time [C Language Interface] ER ercd = td_get_tim ( SYSTIM *tim, UNIT *ofs ) ; [Parameters] SYSTIM* tim Packet address for returning current time (ms) UNIT* ofs Location for returning elapsed time from tim (nanoseconds) [Return Parameters] ER & ercd & Error code tim detail: Current time (ms) ofs detail: Elapsed time from tim (nanoseconds) [Error Codes] E OK Normal completion [Description] Gets the current time as total elapsed milliseconds since 0:00:00 (GMT), January 1, 1985. The value returned in tim is the same as that obtained by tk get tim. tim is the resolution of time interrupt intervals (cycles), but even more precise time information is obtained in ofs as the elapsed time from tim in nanoseconds. The resolution of ofs is implementation-dependent, but generally is the timer hardware resolution. Since tim is time counted based on timer interrupts, in some cases time is not refreshed, when a timer interrupt cycle arrives while interrupts are disabled and the timer interrupt handler is not started (is delayed). In such cases, the time as updated by the previous timer interrupt is returned in tim, and the elapsed time from the previous timer interrupt is returned in ofs. Accordingly, in some cases ofs will be a longer time than the timer interrupt cycle. The length of elapsed time that can be measured by ofs depends on the hardware, but preferably it should be able to measure at least up to twice the timer interrupt cycle ( 0 ≤ ofs < twice the timer interrupt cycle). Note that the time returned in tim and ofs is the time at some point between the calling of and return from td get tim. It is neither the time at which td get tim was called nor the time of return from td get tim. In order to obtain more accurate information, this function should be called in interrupts disabled state. 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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4.6. MEMORY POOL MANAGEMENT FUNCTIO
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4.7. TIME MANAGEMENT FUNCTIONS 163
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4.8. INTERRUPT MANAGEMENT FUNCTIONS
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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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T-Kernel Specification (1.B0.02)

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