T-Kernel Specification (1.B0.02)

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84 CHAPTER 4. T-KERNEL/OS FUNCTIONS When TMO FEVR = (−1) is set in tmout, this means infinity was designated as the timeout value, and the task continues to wait for resource acquisition without timing out. Copyright c○ 2002, 2003 by T-Engine Forum T-Kernel 1.B0.02
4.4. SYNCHRONIZATION AND COMMUNICATION FUNCTIONS 85 tk ref sem Reference Semaphore Status [C Language Interface] ER ercd = tk_ref_sem ( ID semid, T_RSEM *pk_rsem ) ; [Parameters] ID semid Semaphore ID T RSEM* pk rsem Address of packet for returning status information pk rsem detail: VP exinf Extended information ID wtsk Waiting task information INT semcnt Semaphore count (Other implementation-dependent parameters may be added beyond this point.) [Return Parameters] ER ercd Error code [Error Codes] E OK E ID E NOEXS E PAR Normal completion Invalid ID number (semid is invalid or cannot be used) Object does not exist (the semaphore designated in semid does not exist) Parameter error (the return parameter packet address cannot be used) [Description] References the status of the semaphore designated in semid, passing in the return parameters the current semaphore count (semcnt), information on tasks waiting for the semaphore (wtsk), and extended information (exinf). wtsk indicates the ID of a task waiting for the semaphore. If there are two or more such tasks, the ID of the task at the head of the queue is returned. If there are no waiting tasks, wtsk = 0 is returned. If the designated semaphore 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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4.1. TASK MANAGEMENT FUNCTIONS 29 #
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4.1. TASK MANAGEMENT FUNCTIONS 31 t
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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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