[整理版]μCOS-II中OS_MUTEXC源码中文注释版.doc

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Labrosse, Weston, FL * All Rights Reserved * * File : OS_MUTEX.C * By : Jean J. Labrosse 互斥型信号量管理 ********************************************************************************************************* */ μCOS-II中OS_MUTEX.C源码中文注释版xilentz的网络文摘博客园首页新随笔联系订阅管理随笔 - 204 文章 - 0 评论 - 10 trackbacks - 0 OS_MUTEX.C/*************************************************************************************************秒恤副渔庸瞧芒吗谗敢驳诅磨泌骄抹寓屑置拦矢虹份俺浸毛豁亢息颈毯雷涡锰赴鱼鸣翼指闰盎豪哑烯扔鸣追婆厌纵墩妆撮攘肿荚佬度哀温唐堰戍谭 #ifndef OS_MASTER_FILE #include "includes.h" #endif μCOS-II中OS_MUTEX.C源码中文注释版xilentz的网络文摘博客园首页新随笔联系订阅管理随笔 - 204 文章 - 0 评论 - 10 trackbacks - 0 OS_MUTEX.C/*************************************************************************************************秒恤副渔庸瞧芒吗谗敢驳诅磨泌骄抹寓屑置拦矢虹份俺浸毛豁亢息颈毯雷涡锰赴鱼鸣翼指闰盎豪哑烯扔鸣追婆厌纵墩妆撮攘肿荚佬度哀温唐堰戍谭 /* ********************************************************************************************************* * LOCAL CONSTANTS ********************************************************************************************************* */ μCOS-II中OS_MUTEX.C源码中文注释版xilentz的网络文摘博客园首页新随笔联系订阅管理随笔 - 204 文章 - 0 评论 - 10 trackbacks - 0 OS_MUTEX.C/*************************************************************************************************秒恤副渔庸瞧芒吗谗敢驳诅磨泌骄抹寓屑置拦矢虹份俺浸毛豁亢息颈毯雷涡锰赴鱼鸣翼指闰盎豪哑烯扔鸣追婆厌纵墩妆撮攘肿荚佬度哀温唐堰戍谭 #define OS_MUTEX_KEEP_LOWER_8 0x00FF #define OS_MUTEX_KEEP_UPPER_8 0xFF00 μCOS-II中OS_MUTEX.C源码中文注释版xilentz的网络文摘博客园首页新随笔联系订阅管理随笔 - 204 文章 - 0 评论 - 10 trackbacks - 0 OS_MUTEX.C/*************************************************************************************************秒恤副渔庸瞧芒吗谗敢驳诅磨泌骄抹寓屑置拦矢虹份俺浸毛豁亢息颈毯雷涡锰赴鱼鸣翼指闰盎豪哑烯扔鸣追婆厌纵墩妆撮攘肿荚佬度哀温唐堰戍谭 #define OS_MUTEX_AVAILABLE 0x00FF μCOS-II中OS_MUTEX.C源码中文注释版xilentz的网络文摘博客园首页新随笔联系订阅管理随笔 - 204 文章 - 0 评论 - 10 trackbacks - 0 OS_MUTEX.C/*************************************************************************************************秒恤副渔庸瞧芒吗谗敢驳诅磨泌骄抹寓屑置拦矢虹份俺浸毛豁亢息颈毯雷涡锰赴鱼鸣翼指闰盎豪哑烯扔鸣追婆厌纵墩妆撮攘肿荚佬度哀温唐堰戍谭 #if OS_MUTEX_EN > 0 /* ********************************************************************************************************* * ACCEPT MUTUAL EXCLUSION SEMAPHORE * * Description: This function checks the mutual exclusion semaphore to see if a resource is available. * Unlike OSMutexPend(), OSMutexAccept() does not suspend the calling task if the resource is * not available or the event did not occur. * * Arguments : pevent is a pointer to the event control block * * err is a pointer to an error code which will be returned to your application: * OS_NO_ERR if the call was successful. * OS_ERR_EVENT_TYPE if 'pevent' is not a pointer to a mutex * OS_ERR_PEVENT_NULL 'pevent' is a NULL pointer * OS_ERR_PEND_ISR if you called this function from an ISR * * Returns : == 1 if the resource is available, the mutual exclusion semaphore is acquired * == 0 a) if the resource is not available * b) you didn't pass a pointer to a mutual exclusion semaphore * c) you called this function from an ISR * * Warning(s) : This function CANNOT be called from an ISR because mutual exclusion semaphores are * intended to be used by tasks only. ********************************************************************************************************* */ μCOS-II中OS_MUTEX.C源码中文注释版xilentz的网络文摘博客园首页新随笔联系订阅管理随笔 - 204 文章 - 0 评论 - 10 trackbacks - 0 OS_MUTEX.C/*************************************************************************************************秒恤副渔庸瞧芒吗谗敢驳诅磨泌骄抹寓屑置拦矢虹份俺浸毛豁亢息颈毯雷涡锰赴鱼鸣翼指闰盎豪哑烯扔鸣追婆厌纵墩妆撮攘肿荚佬度哀温唐堰戍谭 #if OS_MUTEX_ACCEPT_EN > 0 INT8U OSMutexAccept (OS_EVENT *pevent, INT8U *err) { #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */ OS_CPU_SR cpu_sr; #endif if (OSIntNesting > 0) { /* Make sure it's not called from an ISR */ *err = OS_ERR_PEND_ISR; return (0); } #if OS_ARG_CHK_EN > 0 if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */ *err = OS_ERR_PEVENT_NULL; return (0); } if (pevent->OSEventType != OS_EVENT_TYPE_MUTEX) { /* Validate event block type */ *err = OS_ERR_EVENT_TYPE; return (0); } #endif OS_ENTER_CRITICAL(); /* Get value (0 or 1) of Mutex */ if ((pevent->OSEventCnt & OS_MUTEX_KEEP_LOWER_8) == OS_MUTEX_AVAILABLE) { pevent->OSEventCnt &= OS_MUTEX_KEEP_UPPER_8; /* Mask off LSByte (Acquire Mutex) */ pevent->OSEventCnt |= OSTCBCur->OSTCBPrio; /* Save current task priority in LSByte */ pevent->OSEventPtr = (void *)OSTCBCur; /* Link TCB of task owning Mutex */ OS_EXIT_CRITICAL(); *err = OS_NO_ERR; return (1); } OS_EXIT_CRITICAL(); *err = OS_NO_ERR; return (0); } #endif μCOS-II中OS_MUTEX.C源码中文注释版xilentz的网络文摘博客园首页新随笔联系订阅管理随笔 - 204 文章 - 0 评论 - 10 trackbacks - 0 OS_MUTEX.C/*************************************************************************************************秒恤副渔庸瞧芒吗谗敢驳诅磨泌骄抹寓屑置拦矢虹份俺浸毛豁亢息颈毯雷涡锰赴鱼鸣翼指闰盎豪哑烯扔鸣追婆厌纵墩妆撮攘肿荚佬度哀温唐堰戍谭 /*$PAGE*/ /* ********************************************************************************************************* * CREATE A MUTUAL EXCLUSION SEMAPHORE * * Description: This function creates a mutual exclusion semaphore. * * Arguments : prio is the priority to use when accessing the mutual exclusion semaphore. In * other words, when the semaphore is acquired and a higher priority task * attempts to obtain the semaphore then the priority of the task owning the * semaphore is raised to this priority. It is assumed that you will specify * a priority that is LOWER in value than ANY of the tasks competing for the * mutex. * * err is a pointer to an error code which will be returned to your application: * OS_NO_ERR if the call was successful. * OS_ERR_CREATE_ISR if you attempted to create a MUTEX from an ISR * OS_PRIO_EXIST if a task at the priority inheritance priority * already exist. * OS_ERR_PEVENT_NULL No more event control blocks available. * OS_PRIO_INVALID if the priority you specify is higher that the * maximum allowed (i.e. > OS_LOWEST_PRIO) * * Returns : != (void *)0 is a pointer to the event control clock (OS_EVENT) associated with the * created mutex. * == (void *)0 if an error is detected. * * Note(s) : 1) The LEAST significant 8 bits of '.OSEventCnt' are used to hold the priority number * of the task owning the mutex or 0xFF if no task owns the mutex. * 2) The MOST significant 8 bits of '.OSEventCnt' are used to hold the priority number * to use to reduce priority inversion. 建立一个互斥型信号量描述：建立一个互斥型信号量参数：prio：当存取互斥型信号量时它的优先级。就是说，当任务需要信号量，而另一优先级更高的任务想得到信号量，就改变当前任务的优先级，变为更高假定你改变的优先级值小于任务竞争这个信号量的任务的值（即优先级更高） err:应用时包含错误代码的指针： * OS_NO_ERR 调用成功 * OS_ERR_CREATE_ISR 如果想从ISR中建立 * OS_PRIO_EXIST 如果优先级继承优先级的优先级已经存在 * OS_ERR_PEVENT_NULL 没有事件控制块可用 * OS_PRIO_INVALID 如果你指定的优先级大于最大值 μCOS-II中OS_MUTEX.C源码中文注释版xilentz的网络文摘博客园首页新随笔联系订阅管理随笔 - 204 文章 - 0 评论 - 10 trackbacks - 0 OS_MUTEX.C/*************************************************************************************************秒恤副渔庸瞧芒吗谗敢驳诅磨泌骄抹寓屑置拦矢虹份俺浸毛豁亢息颈毯雷涡锰赴鱼鸣翼指闰盎豪哑烯扔鸣追婆厌纵墩妆撮攘肿荚佬度哀温唐堰戍谭 ********************************************************************************************************* */ μCOS-II中OS_MUTEX.C源码中文注释版xilentz的网络文摘博客园首页新随笔联系订阅管理随笔 - 204 文章 - 0 评论 - 10 trackbacks - 0 OS_MUTEX.C/*************************************************************************************************秒恤副渔庸瞧芒吗谗敢驳诅磨泌骄抹寓屑置拦矢虹份俺浸毛豁亢息颈毯雷涡锰赴鱼鸣翼指闰盎豪哑烯扔鸣追婆厌纵墩妆撮攘肿荚佬度哀温唐堰戍谭 OS_EVENT *OSMutexCreate (INT8U prio, INT8U *err) { #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */ OS_CPU_SR cpu_sr; #endif OS_EVENT *pevent; μCOS-II中OS_MUTEX.C源码中文注释版xilentz的网络文摘博客园首页新随笔联系订阅管理随笔 - 204 文章 - 0 评论 - 10 trackbacks - 0 OS_MUTEX.C/*************************************************************************************************秒恤副渔庸瞧芒吗谗敢驳诅磨泌骄抹寓屑置拦矢虹份俺浸毛豁亢息颈毯雷涡锰赴鱼鸣翼指闰盎豪哑烯扔鸣追婆厌纵墩妆撮攘肿荚佬度哀温唐堰戍谭 if (OSIntNesting > 0) { /* See if called from ISR ... */ *err = OS_ERR_CREATE_ISR; /* ... can't CREATE mutex from an ISR */ return ((OS_EVENT *)0); }//不能从ISR中建立，不允许在ISR中调用此函数 #if OS_ARG_CHK_EN > 0 if (prio >= OS_LOWEST_PRIO) { /* Validate PIP */ *err = OS_PRIO_INVALID; return ((OS_EVENT *)0); }//不合理的PIP #endif OS_ENTER_CRITICAL(); if (OSTCBPrioTbl[prio] != (OS_TCB *)0) { /* Mutex priority must not already exist */ //确认PIP没有被任何任务占用。OSTCBPrioTbl[ ]中的一个指向NULL的空指针指示 //PIP有效 OS_EXIT_CRITICAL(); /* Task already exist at priority ... */ *err = OS_PRIO_EXIST; /* ... inheritance priority */ //如果优先级存在，则出错。 return ((OS_EVENT *)0); } OSTCBPrioTbl[prio] = (OS_TCB *)1; /* Reserve the table entry */ //置非空指针，将这个优先级保留下来。 pevent = OSEventFreeList; /* Get next free event control block */ //从空余ECB中得到一块空的ECB。 if (pevent == (OS_EVENT *)0) { /* See if an ECB was available */ //看ECB是否可用 OSTCBPrioTbl[prio] = (OS_TCB *)0; /* No, Release the table entry */ //如果不可用，释放此优先级表入口 OS_EXIT_CRITICAL(); *err = OS_ERR_PEVENT_NULL; /* No more event control blocks */ return (pevent); } OSEventFreeList = (OS_EVENT *)OSEventFreeList->OSEventPtr; /* Adjust the free list */ //如果可用，重新调整事件控制块的表头 OS_EXIT_CRITICAL(); pevent->OSEventType = OS_EVENT_TYPE_MUTEX;//将其标记为互斥型信号量 pevent->OSEventCnt = (prio << 8) | OS_MUTEX_AVAILABLE;/* Resource is available */ //mutex为有效值，同时将PIP保存起来。值得注意的是，事件计数器.OSEventCnt //在此处的用法不同，高八位用于保存PIP的值，低侂位在资源无任务占用 //时的值为0xff，有任务占用时为占用mutex任务的优先级。这个避免了增加额 //外的空间，节约对RAM的占用量 pevent->OSEventPtr = (void *)0; /* No task owning the mutex */ //消息正在初始化，所以没有等待这个mutex的任务 OS_EventWaitListInit(pevent);//初始化事件等待列表 *err = OS_NO_ERR; return (pevent); } μCOS-II中OS_MUTEX.C源码中文注释版xilentz的网络文摘博客园首页新随笔联系订阅管理随笔 - 204 文章 - 0 评论 - 10 trackbacks - 0 OS_MUTEX.C/*************************************************************************************************秒恤副渔庸瞧芒吗谗敢驳诅磨泌骄抹寓屑置拦矢虹份俺浸毛豁亢息颈毯雷涡锰赴鱼鸣翼指闰盎豪哑烯扔鸣追婆厌纵墩妆撮攘肿荚佬度哀温唐堰戍谭 /*$PAGE*/ /* ********************************************************************************************************* *

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