T-Kernel Specification (1.B0.02)

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90 CHAPTER 4. T-KERNEL/OS FUNCTIONS tk set flg tk clr flg Set Event Flag Clear Event Flag [C Language Interface] ER ercd = tk_set_flg ( ID flgid, UINT setptn ) ; ER ercd = tk_clr_flg ( ID flgid, UINT clrptn ) ; [Parameters] For tk set flg ID flgid Event flag ID UINT setptn Bit pattern to be set For tk clr flg ID flgid Event flag ID UINT clrptn Bit pattern to be cleared [Return Parameters] ER ercd Error code [Error Codes] E OK E ID E NOEXS Normal completion Invalid ID number (flgid is invalid or cannot be used) Object does not exist (the event flag designated in flgid does not exist) [Description] tk set flg sets the bits indicated in setptn in a one-word event flag designated in flgid. That is, a logical sum is taken of the values of the event flag designated in flgid and the values indicated in setptn. tk clr flg clears the bits of the one-word event flag based on the corresponding zero bits of clrptn. That is, a logical product is taken of the values of the event flag designated in flgid and the values indicated in clrptn. After event flag values are changed by tk set flg, if the condition for releasing the wait state of a task that called tk wai flg is met, the WAIT state of that task is cleared, putting it in RUN state or READY state (or SUSPEND state if the waiting task was in WAIT-SUSPEND state). Issuing tk clr flg never results in wait conditions being released for a task waiting for the designated event flag; that is, dispatching never occurs with tk clr flg. Nothing will happen to the event flag if all bits of setptn are cleared to 0 with tk set flg or if all bits of clrptn are set to 1 with tk clr flg. No error will result in either case. Copyright c○ 2002, 2003 by T-Engine Forum T-Kernel 1.B0.02
4.4. SYNCHRONIZATION AND COMMUNICATION FUNCTIONS 91 Multiple tasks can wait for a single event flag if that event flag has the TA WMUL attribute. The event flag in that case has a queue for the waiting tasks. A single tk set flg call for such an event flag may result in the release of multiple waiting tasks. 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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4.5. 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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