IAR PowerPac RTOS User Guide

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In IAR PowerPac RTOS,all resources which are held by the terminated task are released. Any task may be terminatedregardless of its state. This functionality is default for any 16-bit or 32-bit CPU and may be changed by recompilingIAR PowerPac RTOS sources. On 8-bit CPUs, terminating tasks that hold any resources is prohibited. To enable safetermination, the IAR PowerPac RTOS sources have to be recompiled with the compile time switchOS_SUPPORT_CLEANUP_ON_TERMINATE activated.ImportantThis function may not be called from within an interrupt handler.OS_WakeTask()DescriptionEnds delay of a task immediately.Prototypevoid OS_WakeTask (OS_TASK* pTask);ParameterDescriptionpTaskPointer to a data structure of type OS_TASK which is used as task control block (and reference)for this task.Table 17: OS_WakeTask() parameter listAdditional InformationPuts the specified task, which is already suspended for a certain amount of time with OS_Delay() orOS_DelayUntil() back to the state TS_READY (ready for execution).The specified task will be activated immediately if it has a higher priority than the priority of the task that had thehighest priority before. If the specified task is not in the state TS_DELAY (because it has already been activated, orthe delay has already expired, or for some other reason), this command is ignored.OS_IsTask()DescriptionDetermines whether a task control block actually belongs to a valid task.Prototypechar OS_IsTask (OS_TASK* pTask);ParameterDescriptionpTaskPointer to a data structure of type OS_TASK which is used as task control block (and reference)for this task.Table 18: OS_IsTask() parameter listReturn valueCharacter value:0: TCB is not used by any task1: TCB is used by a taskAdditional InformationThis function checks if the specified task is still in the internal task list. If the task was terminated, it is removed fromthe internal task list. This function may be useful to determine whether the task control block and stack for the taskmay be reused for another task in applications that create and terminate tasks dynamically.OS_GetTaskID()DescriptionReturns the ID of the currently running task.PrototypeOS_TASKID OS_GetTaskID (void);34IAR PowerPac RTOSfor ARM CoresPPRTOS-2
Task routinesReturn valueOS_TASKID: A pointer to the task control block. A value of 0 (NULL) indicates that no task is executing.Additional InformationThis function may be used for determining which task is executing. This may be helpful if the reaction of any functiondepends on the currently running task.OS_GetpCurrentTask()DescriptionReturns a pointer to the task control block structure of the currently running task.PrototypeOS_TASK* OS_GetpCurrentTask (void);Return valueOS_TASK*: A pointer to the task control block structure.Additional InformationThis function may be used for determining which task is executing. This may be helpful if the reaction of any functiondepends on the currently running task.PPRTOS-235
Page 1 and 2: IAR PowerPac RTOSUser GuidePPRTOS-2
Page 3 and 4: PrefaceWelcome to the IAR PowerPac
Page 5 and 6: ContentsPreface ...................
Page 7 and 8: ContentsOS_WaitCSema() ............
Page 9 and 10: ContentsOS_LeaveInterrupt() .......
Page 11 and 12: Introduction to IAR PowerPacRTOSWha
Page 13 and 14: Basic conceptsTasksIn this context,
Page 15 and 16: Basic conceptsPREEMPTIVES MULTITASK
Page 17 and 18: Basic conceptsMAILBOXES AND QUEUESA
Page 19 and 20: Basic conceptsThe active task may b
Page 21 and 22: Basic conceptsThe flowchart below i
Page 23 and 24: Basic conceptsLIST OF LIBRARIESIn y
Page 25 and 26: Task routinesIntroductionA task tha
Page 27 and 28: Task routinesOS_CREATETASK() can be
Page 29 and 30: Task routinesExampleThe following e
Page 31 and 32: Task routinesExampleint sec,min;voi
Page 33: Task routinesAdditional Information
Page 37 and 38: Software timersSoftware timerA soft
Page 39 and 40: Software timers#define OS_CREATETIM
Page 41 and 42: Software timersOS_SetTimerPeriod()D
Page 43 and 44: Software timersAdditional Informati
Page 45 and 46: Software timersAdditional Informati
Page 47 and 48: Software timersExampleOS_TIMER TIME
Page 49 and 50: Resource semaphoresIntroductionReso
Page 51 and 52: Resource semaphoresResource semapho
Page 53 and 54: Resource semaphoresOS_Request()Desc
Page 55 and 56: Counting SemaphoresIntroductionCoun
Page 57 and 58: Counting SemaphoresPrototypevoid OS
Page 59 and 60: Counting SemaphoresReturn value0: I
Page 61 and 62: MailboxesWhy mailboxes?In the prece
Page 63 and 64: MailboxesMailboxes API function ove
Page 65 and 66: MailboxesExampleSingle-byte mailbox
Page 67 and 68: MailboxesPrototypevoid OS_GetMail (
Page 69 and 70: MailboxesOS_WaitMail()DescriptionWa
Page 71 and 72: QueuesWhy queues?In the preceding c
Page 73 and 74: QueuesReturn valueThe size of the r
Page 75 and 76: QueuesExamplestatic void MemoryTask
Page 77 and 78: Task eventsIntroductionTask events
Page 79 and 80: Task eventsExampleOS_WaitEventTimed
Page 81 and 82: Task eventsPrototypechar OS_ClearEv
Page 83 and 84: Event objectsIntroductionEvent obje
Page 85 and 86:
Event objectsExampleif (OS_EVENT_Wa
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Event objectsExampleOS_EVENT_Reset(
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Heap type memory managementANSI C o
Page 91 and 92:
Fixed block size memory poolsIntrod
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Fixed block size memory poolsProtot
Page 95 and 96:
Fixed block size memory poolsProtot
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StacksIntroductionThe stack is the
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InterruptsIntroductionIn this chapt
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InterruptsRules for interrupt handl
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InterruptsOS_LeaveInterruptNoSwitch
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InterruptsNesting interrupt routine
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Critical RegionsIntroductionCritica
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System variablesIntroductionThe sys
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Configuration for your targetsystem
Page 113 and 114:
Time measurementIntroductionIAR Pow
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Time measurementPrototypeU32 OS_Get
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Time measurementPrototypeOS_U32 OS_
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RTOS-aware debuggingThis chapter de
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RTOS-aware debuggingTimersA softwar
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DebuggingRuntime errorsSome error c
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DebuggingValue Define Description17
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Performance and resource usageThis
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Performance and resource usageThe c
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Performance and resource usage*/sta
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ReentranceAll routines that can be
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LimitationsThe following limitation
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Source code of kernel and libraryIn
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Additional modulesKeyboard manager:
Page 141 and 142:
FAQ (frequently asked questions)Q:
Page 143 and 144:
GlossaryActive TaskCooperativemulti
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IndexIndexAAdditional modules . . .
Page 147:
IndexOS_WaitSingleEventTimed(). . .
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IAR PowerPac RTOS User Guide

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