T-Kernel Specification (1.B0.02)

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52 CHAPTER 4. T-KERNEL/OS FUNCTIONS 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. When the task designated with tk ref tsk does not exist, error code E NOEXS is returned. [Additional Notes] Even when tskid = TSK SELF is designated with this system call, the ID of the invoking task is not known. Use tk get tid to find out the ID of the invoking task. Copyright c○ 2002, 2003 by T-Engine Forum T-Kernel 1.B0.02
4.2. TASK-DEPENDENT SYNCHRONIZATION FUNCTIONS 53 4.2 Task-Dependent Synchronization Functions Task-dependent synchronization functions achieve synchronization among tasks by direct manipulation of task states. They include functions for task sleep and wakeup, for canceling wakeup requests, for forcibly releasing task WAIT state, for changing a task state to SUSPEND state, for delaying execution of the invoking task, and for disabling task WAIT state. Wakeup requests for a task are queued. That is, when it is attempted to wake up a task that is not sleeping, the wakeup request is remembered, and the next time the task is to go to a sleep state (waiting for wakeup), it does not enter that state. The queuing of task wakeup requests is realized by having the task keep a task wakeup request queuing count. When the task is started, this count is cleared to 0. Suspend requests for a task are nested. That is, if it is attempted to suspend a task already in SUSPEND state (including WAIT-SUSPEND state), the request is remembered, and later when it is attempted to resume the task in SUSPEND state (including WAIT-SUSPEND state), it is not resumed. The nesting of suspend requests is realized by having the task keep a suspend request nesting count. When the task is started, this count is cleared to 0. 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
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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4.4. SYNCHRONIZATION AND COMMUNICAT
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4.4. SYNCHRONIZATION AND COMMUNICAT
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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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5.5. 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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