T-Kernel Specification (1.B0.02)

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122 CHAPTER 4. T-KERNEL/OS FUNCTIONS Only positive values can be set in tmout. The time base for tmout (time unit) is the same as that for system time (= 1 ms). When TMO POL = 0 is set in tmout, this means 0 was designated as the timeout value, and E TMOUT is returned without entering WAIT state if there is not enough buffer space. When TMO FEVR = (−1) is set in tmout, this means infinity was designated as the timeout value, and the task continues to wait for buffer space to become available, without timing out. A message of size 0 cannot be sent. When msgsz ≤ 0 is designated, error code E PAR is returned. When this system call is invoked from a task-independent portion or in dispatch disabled state, error code E CTX is returned; but in the case of tmout = TMO POL, there may be implementations where execution from a task-independent portion or in dispatch disabled state is possible. Copyright c○ 2002, 2003 by T-Engine Forum T-Kernel 1.B0.02
4.5. EXTENDED SYNCHRONIZATION AND COMMUNICATION FUNCTIONS 123 tk rcv mbf Receive Message from Message Buffer [C Language Interface] INT msgsz = tk_rcv_mbf ( ID mbfid, VP msg, TMO tmout ) ; [Parameters] ID mbfid Message buffer ID VP msg Start address of receive message packet TMO tmout Timeout designation [Return Parameters] INT msgsz Received message size or Error Code [Error Codes] E OK E ID E NOEXS E PAR E DLT E RLWAI E DISWAI E TMOUT E CTX Normal completion Invalid ID number (mbfid is invalid or cannot be used) Object does not exist (the message buffer designated in mbfid does not exist) Parameter error (value that cannot be used in msg, or tmout ≤ (−2)) The object being waited for was deleted (message buffer was deleted while waiting) Wait state released (tk rel wai received in wait state) Wait released by wait disabled state Polling failed or timeout Context error (issued from task-independent portion or in dispatch disabled state) [Description] Receives a message from the message buffer designated in mbfid, putting it in the location designated in msg. This system call copies the contents of the first queued message in the message buffer designated in mbfid, and copies it to an area of msgsz bytes starting at address msg. If no message has been sent to the message buffer designated in mbfid (the message queue is empty), the task issuing this system call goes to WAIT state and is put in the receive queue of the message buffer to wait for message arrival. Tasks in the receive queue are ordered by FIFO only. A maximum wait time (timeout) can be set in tmout. If the tmout time elapses before the wait release condition is met (before a message arrives), the system call terminates, returning timeout error code E TMOUT. Only positive values can be set in tmout. The time base for tmout (time unit) is the same as that for system time (= 1 ms). 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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4.2. TASK-DEPENDENT SYNCHRONIZATION
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4.3. TASK EXCEPTION HANDLING FUNCTI
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4.7. TIME MANAGEMENT FUNCTIONS 173
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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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