T-Kernel Specification (1.B0.02)

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50 CHAPTER 4. T-KERNEL/OS FUNCTIONS tk ref tsk Reference Task Status [C Language Interface] ER ercd = tk_ref_tsk ( ID tskid, T_RTSK *pk_rtsk ) ; [Parameters] ID tskid Task ID T RTSK* pk rtsk Address of packet for returning task status [Return Parameters] ER ercd Error code pk rtsk detail: VP exinf Extended information PRI tskpri Current task priority PRI tskbpri Base priority UINT tskstat Task state UINT tskwait Wait factor ID wid Waiting object ID INT wupcnt Queued wakeup requests INT suscnt Nested suspend requests RELTIM slicetime Maximum continuous run time allowed (ms) UINT waitmask Disabled wait factors UINT texmask Allowed task exceptions UINT tskevent Task events (Other implementation-dependent parameters may be added beyond this point.) [Error Codes] E OK E ID E NOEXS E PAR Normal completione Invalid ID number (tskid is invalid or cannot be used) Object does not exist (the task designated in tskid does not exist) Parameter error (the return parameter packet address cannot be used) [Description] Gets the state of the task designated in tskid. tskstat takes the following values. Copyright c○ 2002, 2003 by T-Engine Forum T-Kernel 1.B0.02
4.1. TASK MANAGEMENT FUNCTIONS 51 tskstat: TTS RUN 0x0001 RUN TTS RDY 0x0002 READY TTS WAI 0x0004 WAIT TTS SUS 0x0008 SUSPEND TTS WAS 0x000c WAIT-SUSPEND TTS DMT 0x0010 DORMANT TTS NODISWAI 0x0080 Wait state disabled Task states such as TTS RUN and TTS WAI are expressed by corresponding bits, which is useful when making a complex state decision (e.g., deciding that the state is one of either RUN or READY state). Note that of the above states, TTS WAS is a combination of TTS SUS and TTS WAI, but TTS SUS is never combined with other states (TTS RUN, TTS RDY, TTS DMT). In the case of TTS WAI (including TTS WAS), if wait states are disabled by tk dis wai, TTS NODISWAI is set. TTS NODISWAI is never combined with states other than TTS WAI. When tk ref tsk is executed for an interrupted task from an interrupt handler, RUN (TTS RUN) is returned as tskstat. When tskstat is TTS WAI (including TTS WAS), the values of tskwait and wid are as shown in Table 4.2. tskwait Value Description wid TTW SLP 0x00000001 Wait caused by tk slp tsk 0 TTW DLY 0x00000002 Wait caused by tk dly tsk 0 TTW SEM 0x00000004 Wait caused by tk wai sem semid TTW FLG 0x00000008 Wait caused by tk wai flg flgid TTW MBX 0x00000040 Wait caused by tk rcv mbx mbxid TTW MTX 0x00000080 Wait caused by tk loc mtx mtxid TTW SMBF 0x00000100 Wait caused by tk snd mbf mbfid TTW RMBF 0x00000200 Wait caused by tk rcv mbf mbfid TTW CAL 0x00000400 Wait on rendezvous call porid TTW ACP 0x00000800 Wait for rendezvous acceptance porid TTW RDV 0x00001000 Wait for rendezvous completion 0 (TTW CAL|TTW RDV) 0x00001400 Wait on rendezvous call or wait for rendezvous completion 0 TTW MPF 0x00002000 Wait for tk get mpf mpfi TTW MPL 0x00004000 Wait for tk get mpl mplid TTW EV1 0x00010000 Wait for task event #1 0 TTW EV2 0x00020000 Wait for task event #2 0 TTW EV3 0x00040000 Wait for task event #3 0 TTW EV4 0x00080000 Wait for task event #4 0 TTW EV5 0x00100000 Wait for task event #5 0 TTW EV6 0x00200000 Wait for task event #6 0 TTW EV7 0x00400000 Wait for task event #7 0 TTW EV8 0x00800000 Wait for task event #8 0 Table 4.2: Values of tskwait and wid When tskstat is not TTS WAI (including TTS WAS), both tskwait and wid are 0. waitmask is the same bit array as tskwait. For a task in DORMANT state, wupcnt = 0, suscnt = 0, and tskevent = 0. 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
Page 23 and 24: Index of T-Kernel/DS System Calls T
Page 25 and 26: Chapter 1 T-Kernel Overview 1.1 Pos
Page 27 and 28: 1.2. SCALABILITY 3 • Middleware m
Page 29 and 30: Chapter 2 Concepts Underlying the T
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Page 41 and 42: Chapter 3 Common T-Kernel Specifica
Page 43 and 44: 3.2. SYSTEM CALLS 19 /* * Common co
Page 45 and 46: 3.2. SYSTEM CALLS 21 Ordinarily a f
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Page 49 and 50: Chapter 4 T-Kernel/OS Functions Thi
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4.4. SYNCHRONIZATION AND COMMUNICAT
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4.5. EXTENDED SYNCHRONIZATION AND C
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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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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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5.5. 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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