T-Kernel Specification (1.B0.02)

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40 CHAPTER 4. T-KERNEL/OS FUNCTIONS If the designated task is the only one running at its priority, the time slice is effectively meaningless and the task runs continuously. If a task of slicetime = 0 is included in tasks of the same priority, as soon as that task obtains execution right, round robin scheduling is stopped. The method of counting run time is implementation-dependent, but does not need to be especially precise. In fact, applications should not expect very high precision. Copyright c○ 2002, 2003 by T-Engine Forum T-Kernel 1.B0.02
4.1. TASK MANAGEMENT FUNCTIONS 41 tk get tsp Get Task Space [C Language Interface] ER ercd = tk_get_tsp ( ID tskid, T_TSKSPC *pk_tskspc ) ; [Parameters] ID tskid Task ID [Return Parameters] T TSKSPC tskspc Task space information ER ercd Error code typedef struct t_tskspc { VP uatb; Task space page table address INT lsid; Task space ID (logical space ID) } T_TSKSPC; [Error Codes] E OK E ID E NOEXS E PAR Normal completion 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 current task space information for the task designated in tskid. The invoking task can be designated by setting tskid = TSK SELF = 0. Note, however, that when a system call is issued from a task-independent portion and tskid = TSK SELF = 0 is designated, error code E ID is returned. [Additional Notes] The accuracy of T TSKSPC (uatb, lsid) designation is implementation-dependent, but the above definitions should be followed to the extent possible. 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
Page 13 and 14: List of Tables 2.1 State Transition
Page 15 and 16: System Call Notation In the parts o
Page 17 and 18: Index of T-Kernel/OS System Calls T
Page 19 and 20: INDEX OF T-KERNEL/OS SYSTEM CALLS x
Page 21 and 22: 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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4.7. TIME MANAGEMENT FUNCTIONS 163
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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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