T-Kernel Specification (1.B0.02)

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88 CHAPTER 4. T-KERNEL/OS FUNCTIONS flgatr:= (TA_TFIFO || TA_TPRI) | (TA_WMUL || TA_WSGL) | [TA_NODISWAI] TA TFIFO TA TPRI TA WSGL TA WMUL TA NODISWAI Tasks are queued in FIFO order Tasks are queued in priority order Waiting for multiple tasks is not allowed (Wait Single Task) Waiting for multiple tasks is allowed (Wait Multiple Task) Wait disabling by tk dis wai is prohibited When TA WSGL is designated, multiple tasks cannot be in WAIT state at the same time. Designating TA WMUL allows waiting by multiple tasks at the same time. The queuing order of tasks waiting for an event flag can be designated in TA TFIFO or TA TPRI. If the attribute is TA TFIFO, tasks are ordered by FIFO, whereas TA TPRI designates queuing of tasks in order of their priority setting. When TA WSGL is designated, however, since tasks cannot be queued, designation of TA TFIFO or TA TPRI makes no difference. When multiple tasks are waiting for an event flag, tasks are checked in order from the head of the queue, and the wait is released for tasks meeting the conditions. The first task to have its WAIT state released is therefore not necessarily the first in the queue. If multiple tasks meet the conditions, wait state is released for each of them. #define TA_TFIFO 0x00000000 /* manage queue by FIFO */ #define TA_TPRI 0x00000001 /* manage queue by priority */ #define TA_WSGL 0x00000000 /* prohibit multiple task waiting */ #define TA_WMUL 0x00000008 /* allow multiple task waiting */ #define TA_NODISWAI 0x00000080 /* prohibit wait disabling */ Copyright c○ 2002, 2003 by T-Engine Forum T-Kernel 1.B0.02
4.4. SYNCHRONIZATION AND COMMUNICATION FUNCTIONS 89 tk del flg Delete Event Flag [C Language Interface] ER ercd = tk_del_flg ( ID flgid ) ; [Parameters] ID flgid Event flag ID [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] Deletes the event flag designated in flgid. Issuing this system call releases the corresponding event flag ID and control block memory space. This system call is completed normally even if there are tasks waiting for the event flag, but error code E DLT is returned to each task in WAIT 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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4.1. 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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T-Kernel Specification (1.B0.02)

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