T-Kernel Specification (1.B0.02)

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182 CHAPTER 4. T-KERNEL/OS FUNCTIONS tk ref alm Reference Alarm Handler Status [C Language Interface] ER ercd = tk_ref_alm ( ID almid, T_RALM *pk_ralm ) ; [Parameters] ID almid Alarm handler ID T RALM* pk ralm Address of packet for returning status information [Return Parameters] ER ercd Error code pk ralm detail: VP exinf Extended information RELTIM lfttim Time remaining until the handler starts UINT almstat Alarm handler activation state (Other implementation-dependent parameters may be added beyond this point.) [Error Codes] E OK E ID E NOEXS E PAR 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) Parameter error (the return parameter packet address cannot be used) [Description] References the status of the alarm handler designated in almno, passing in return parameters the time remaining until the handler starts lfttim, and extended information exinf. The following information is returned in almstat. almstat:= (TALM_STP | TALM_STA) TALM STP TALM STA Thg alarm handler is inactive The alarm handler is active #define TALM_STP 0x00 /* alarm handler is inactive */ #define TALM_STA 0x01 /* alarm handler is active */ Copyright c○ 2002, 2003 by T-Engine Forum T-Kernel 1.B0.02
4.7. TIME MANAGEMENT FUNCTIONS 183 If the alarm handler is active (TALM STA), lfttim returns the relative time until the alarm handler is scheduled to start. This value is within the range almtim ≥ lfttim ≥ 0 designated with tk sta alm. Since lfttim is decremented with each timer interrupt, lfttim = 0 means the alarm handler will start at the next timer interrupt. If the alarm handler is inactive (TALM STP), lfttim is indeterminate. If the alarm handler designated with tk ref alm in almid does not exist, error code E NOEXS is returned. 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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4.5. EXTENDED SYNCHRONIZATION AND C
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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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