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上文主要介紹了消息隊列相關的函數，本文介紹郵箱管理相關的函數：OSMboxCreate()建立一個郵箱,OSMboxDel()刪除一個郵箱,OSMboxPend()等待郵箱中的消息,OSMboxPost()向郵箱發送一則消息，OSMboxQuery()查詢一個郵箱的狀態

## 郵箱管里介紹

郵箱是μC/OS-II中另一種通訊機制，它可以使一個任務或者中斷服務子程序向另一個任務發送一個指針型的變量。該指針指向一個包含了特定“消息”的數據結構。為了在μC/OS-II中使用郵箱，必須將OS_CFG.H中的OS_MBOX_EN常數置為1。   
使用郵箱之前，必須先建立該郵箱。該操作可以通過調用OSMboxCreate()函數來完成（見下節），并且要指定指針的初始值。一般情況下，這個初始值是NULL，但也可以初始化一個郵箱，使其在最開始就包含一條消息。如果使用郵箱的目的是用來通知一個事件的發生（發送一條消息），那么就要初始化該郵箱為NULL，因為在開始時，事件還沒有發生。如果用戶用郵箱來共享某些資源，那么就要初始化該郵箱為一個非NULL的指針。在這種情況下，郵箱被當成一個二值信號量使用。   
μC/OS-II提供了6種對郵箱的操作：OSMboxCreate()，OSMboxDel()，OSMboxPend()，OSMboxPost()，OSMboxAccept()和OSMboxQuery()函數。圖 F10.6描述了任務、中斷服務子程序和郵箱之間的關系，這里用符號“I”表示郵箱。郵箱包含的內容是一個指向一條消息的指針。一個郵箱只能包含一個這樣的指針（郵箱為滿時），或者一個指向NULL的指針（郵箱為空時）。從圖 F10.6可以看出，任務或者中斷服務子程序可以調用函數OSMboxPost()，但是只有任務可以調用函數OSMboxPend()和OSMboxQuery()。 

## OSMboxCreate()建立一個郵箱

1主要作用：基本上和函數OSSemCreate()相似。建立一個郵箱變量；   
2函數原型：OS_EVENT *OSMboxCreate (void *msg)   
3參數說明：msg 是一個要在任務間傳遞的變量指針   
4返回值說明：OSMboxCreate()函數的返回值是一個指向事件控制塊的指針[L10.14(3)]。這個指針在調用函數OSMboxPend()，OSMboxPost()，OSMboxAccept()和OSMboxQuery()時使用。因此，該指針可以看作是對應郵箱的句柄。值得注意的是，如果系統中已經沒有事件控制塊可用，函數OSMboxCreate()將返回一個NULL指針。   
5函數主體在os_mbox.c中

## OSMboxDel()刪除一個郵箱

1、主要作用：對一個不再使用的消息郵箱要及時刪除以釋放資源。   
2、函數原型：OS_EVENT *OSMboxDel (OS_EVENT *pevent, INT8U opt, INT8U *err)   
3、參數說明：*pevent郵箱句柄   
opt == OS_DEL_NO_PEND 如果沒有等待任務時刪除郵箱；   
opt == OS_DEL_ALWAYS 無條件刪除又向，所有等待該事件的任務急轉到就緒狀態；   
err 是本函數執行狀態的返回值，*err 的值含義：   
?OS_NO_ERR —- 函數成功，指定的郵箱被刪除；   
?OS_INVALID_OPT —- 刪除方式數據錯；   
?OS_ERR_EVENT_TYPE —- 欲刪除的事件類型不是郵箱；   
?OS_ERR_DEL_ISR —- 不支持ISR中的消息郵箱刪除操作；   
?OS_ERR_PEVENT_NULL —- 指定的事件為空（不存在）；   
?OS_ERR_TASK_WAITING —- 郵箱中還有等待任務；   
4、返回值說明：刪除的句柄   
5函數主體在os_mbox.c中

## OSMboxPend()等待郵箱中的消息

1、主要作用 ：所謂的 “請求消息郵箱” 就是等待一個消息傳送到消息郵箱，或取得一個消息數據。   
2、函數原型：void *OSMboxPend (OS_EVENT *pevent, INT16U timeout, INT8U *err)   
3、參數說明：*pevent消息郵箱指針；timeout等待時限；err函數執行信息；   
4、返回值說明：返回值為空時意味著未得到消息，此時uC/OS-II執行OS_Sched()；可能消息未準備好，或指示的事件出錯、超時等，此時函數直接返回，用戶應查閱 *err的狀態。   
當返回值 != Null 時，返回值就是一個預期消息的指針；   
5函數主體在os_mbox.c中

## OSMboxPost()向郵箱發送一則消息，

1、主要作用：可以調用系統函數OSMboxPost( )函數向消息郵箱發送消息；   
2、函數原型：INT8U OSMboxPost (OS_EVENT *pevent, void *msg)   
3、參數說明：形參 msg 是一個要在任務間傳遞的變量指針；形參 pevent 是消息郵箱指針；   
4、返回值說明：   
1、OS_NO_ERR —- 消息發送成功；   
2、 OS_MBOX_FULL —- 不能向滿郵箱再發送消息；   
3、OS_ERR_EVENT_TYPE —- 指定的事件不是消息郵箱類型；   
4、OS_ERR_PEVENT_NULL —- 不能向不存在的消息郵箱發送消息；   
5、OS_ERR_POST_NULL_PTR —- 消息緩沖區不能為空；   
5函數主體在os_mbox.c中   
向郵箱發送一則消息可以用下面函數，功能更強大，可發送廣播消息   
INT8U OSMboxPostOpt (OS_EVENT *pevent, void *msg, INT8U opt) 

## OSMboxQuery()查詢一個郵箱的狀態

1、主要作用：函數使應用程序可以隨時查詢一個郵箱的當前狀態   
2、函數原型：INT8U OSMboxQuery (OS_EVENT *pevent, OS_MBOX_DATA *pdata)   
3、參數說明：一個是指向郵箱的指針pevent。該指針是在建立該郵箱時，由OSMboxCreate()函數返回的；另一個是指向用來保存有關郵箱的信息的OS_MBOX_DATA（見uCOS_II.H）數據結構的指針pdata。   
４、返回值說明：OS_NO_ERR ：調用成功   
OS_ERR_EVENT_TYPE ：pevent 不是指向消息郵箱的指針。   
注意/警告:必須先建立消息郵箱，然后使用。

5函數主體在os_mbox.c中

## 附os_mbox.c代碼：

~~~
/*
*********************************************************************************************************
*                                                uC/OS-II
*                                          The Real-Time Kernel
*                                       MESSAGE MAILBOX MANAGEMENT
*
*                              (c) Copyright 1992-2013, Micrium, Weston, FL
*                                           All Rights Reserved
*
* File    : OS_MBOX.C
* By      : Jean J. Labrosse
* Version : V2.92.08
*
* LICENSING TERMS:
* ---------------
*   uC/OS-II is provided in source form for FREE evaluation, for educational use or for peaceful research.
* If you plan on using  uC/OS-II  in a commercial product you need to contact Micrium to properly license
* its use in your product. We provide ALL the source code for your convenience and to help you experience
* uC/OS-II.   The fact that the  source is provided does  NOT  mean that you can use it without  paying a
* licensing fee.
*********************************************************************************************************
*/

#define  MICRIUM_SOURCE

#ifndef  OS_MASTER_FILE
#include <ucos_ii.h>
#endif

#if OS_MBOX_EN > 0u
/*
*********************************************************************************************************
*                                        ACCEPT MESSAGE FROM MAILBOX
*
* Description: This function checks the mailbox to see if a message is available.  Unlike OSMboxPend(),
*              OSMboxAccept() does not suspend the calling task if a message is not available.
*
* Arguments  : pevent        is a pointer to the event control block
*
* Returns    : != (void *)0  is the message in the mailbox if one is available.  The mailbox is cleared
*                            so the next time OSMboxAccept() is called, the mailbox will be empty.
*              == (void *)0  if the mailbox is empty or,
*                            if 'pevent' is a NULL pointer or,
*                            if you didn't pass the proper event pointer.
*********************************************************************************************************
*/

#if OS_MBOX_ACCEPT_EN > 0u
void  *OSMboxAccept (OS_EVENT *pevent)
{
    void      *pmsg;
#if OS_CRITICAL_METHOD == 3u                              /* Allocate storage for CPU status register  */
    OS_CPU_SR  cpu_sr = 0u;
#endif

#if OS_ARG_CHK_EN > 0u
    if (pevent == (OS_EVENT *)0) {                        /* Validate 'pevent'                         */
        return ((void *)0);
    }
#endif
    if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) {      /* Validate event block type                 */
        return ((void *)0);
    }
    OS_ENTER_CRITICAL();
    pmsg               = pevent->OSEventPtr;
    pevent->OSEventPtr = (void *)0;                       /* Clear the mailbox                         */
    OS_EXIT_CRITICAL();
    return (pmsg);                                        /* Return the message received (or NULL)     */
}
#endif
/*$PAGE*/
/*
*********************************************************************************************************
*                                          CREATE A MESSAGE MAILBOX
*
* Description: This function creates a message mailbox if free event control blocks are available.
*
* Arguments  : pmsg          is a pointer to a message that you wish to deposit in the mailbox.  If
*                            you set this value to the NULL pointer (i.e. (void *)0) then the mailbox
*                            will be considered empty.
*
* Returns    : != (OS_EVENT *)0  is a pointer to the event control clock (OS_EVENT) associated with the
*                                created mailbox
*              == (OS_EVENT *)0  if no event control blocks were available
*********************************************************************************************************
*/

OS_EVENT  *OSMboxCreate (void *pmsg)
{
    OS_EVENT  *pevent;
#if OS_CRITICAL_METHOD == 3u                     /* Allocate storage for CPU status register           */
    OS_CPU_SR  cpu_sr = 0u;
#endif

#ifdef OS_SAFETY_CRITICAL_IEC61508
    if (OSSafetyCriticalStartFlag == OS_TRUE) {
        OS_SAFETY_CRITICAL_EXCEPTION();
        return ((OS_EVENT *)0);
    }
#endif

    if (OSIntNesting > 0u) {                     /* See if called from ISR ...                         */
        return ((OS_EVENT *)0);                  /* ... can't CREATE from an ISR                       */
    }
    OS_ENTER_CRITICAL();
    pevent = OSEventFreeList;                    /* Get next free event control block                  */
    if (OSEventFreeList != (OS_EVENT *)0) {      /* See if pool of free ECB pool was empty             */
        OSEventFreeList = (OS_EVENT *)OSEventFreeList->OSEventPtr;
    }
    OS_EXIT_CRITICAL();
    if (pevent != (OS_EVENT *)0) {
        pevent->OSEventType    = OS_EVENT_TYPE_MBOX;
        pevent->OSEventCnt     = 0u;
        pevent->OSEventPtr     = pmsg;           /* Deposit message in event control block             */
#if OS_EVENT_NAME_EN > 0u
        pevent->OSEventName    = (INT8U *)(void *)"?";
#endif
        OS_EventWaitListInit(pevent);
    }
    return (pevent);                             /* Return pointer to event control block              */
}
/*$PAGE*/
/*
*********************************************************************************************************
*                                           DELETE A MAIBOX
*
* Description: This function deletes a mailbox and readies all tasks pending on the mailbox.
*
* Arguments  : pevent        is a pointer to the event control block associated with the desired
*                            mailbox.
*
*              opt           determines delete options as follows:
*                            opt == OS_DEL_NO_PEND   Delete the mailbox ONLY if no task pending
*                            opt == OS_DEL_ALWAYS    Deletes the mailbox even if tasks are waiting.
*                                                    In this case, all the tasks pending will be readied.
*
*              perr          is a pointer to an error code that can contain one of the following values:
*                            OS_ERR_NONE             The call was successful and the mailbox was deleted
*                            OS_ERR_DEL_ISR          If you attempted to delete the mailbox from an ISR
*                            OS_ERR_INVALID_OPT      An invalid option was specified
*                            OS_ERR_TASK_WAITING     One or more tasks were waiting on the mailbox
*                            OS_ERR_EVENT_TYPE       If you didn't pass a pointer to a mailbox
*                            OS_ERR_PEVENT_NULL      If 'pevent' is a NULL pointer.
*
* Returns    : pevent        upon error
*              (OS_EVENT *)0 if the mailbox was successfully deleted.
*
* Note(s)    : 1) This function must be used with care.  Tasks that would normally expect the presence of
*                 the mailbox MUST check the return code of OSMboxPend().
*              2) OSMboxAccept() callers will not know that the intended mailbox has been deleted!
*              3) This call can potentially disable interrupts for a long time.  The interrupt disable
*                 time is directly proportional to the number of tasks waiting on the mailbox.
*              4) Because ALL tasks pending on the mailbox will be readied, you MUST be careful in
*                 applications where the mailbox is used for mutual exclusion because the resource(s)
*                 will no longer be guarded by the mailbox.
*              5) All tasks that were waiting for the mailbox will be readied and returned an 
*                 OS_ERR_PEND_ABORT if OSMboxDel() was called with OS_DEL_ALWAYS
*********************************************************************************************************
*/

#if OS_MBOX_DEL_EN > 0u
OS_EVENT  *OSMboxDel (OS_EVENT  *pevent,
                      INT8U      opt,
                      INT8U     *perr)
{
    BOOLEAN    tasks_waiting;
    OS_EVENT  *pevent_return;
#if OS_CRITICAL_METHOD == 3u                               /* Allocate storage for CPU status register */
    OS_CPU_SR  cpu_sr = 0u;
#endif

#ifdef OS_SAFETY_CRITICAL
    if (perr == (INT8U *)0) {
        OS_SAFETY_CRITICAL_EXCEPTION();
        return ((OS_EVENT *)0);
    }
#endif

#if OS_ARG_CHK_EN > 0u
    if (pevent == (OS_EVENT *)0) {                         /* Validate 'pevent'                        */
        *perr = OS_ERR_PEVENT_NULL;
        return (pevent);
    }
#endif
    if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) {       /* Validate event block type                */
        *perr = OS_ERR_EVENT_TYPE;
        return (pevent);
    }
    if (OSIntNesting > 0u) {                               /* See if called from ISR ...               */
        *perr = OS_ERR_DEL_ISR;                            /* ... can't DELETE from an ISR             */
        return (pevent);
    }
    OS_ENTER_CRITICAL();
    if (pevent->OSEventGrp != 0u) {                        /* See if any tasks waiting on mailbox      */
        tasks_waiting = OS_TRUE;                           /* Yes                                      */
    } else {
        tasks_waiting = OS_FALSE;                          /* No                                       */
    }
    switch (opt) {
        case OS_DEL_NO_PEND:                               /* Delete mailbox only if no task waiting   */
             if (tasks_waiting == OS_FALSE) {
#if OS_EVENT_NAME_EN > 0u
                 pevent->OSEventName = (INT8U *)(void *)"?";
#endif
                 pevent->OSEventType = OS_EVENT_TYPE_UNUSED;
                 pevent->OSEventPtr  = OSEventFreeList;    /* Return Event Control Block to free list  */
                 pevent->OSEventCnt  = 0u;
                 OSEventFreeList     = pevent;             /* Get next free event control block        */
                 OS_EXIT_CRITICAL();
                 *perr               = OS_ERR_NONE;
                 pevent_return       = (OS_EVENT *)0;      /* Mailbox has been deleted                 */
             } else {
                 OS_EXIT_CRITICAL();
                 *perr               = OS_ERR_TASK_WAITING;
                 pevent_return       = pevent;
             }
             break;

        case OS_DEL_ALWAYS:                                /* Always delete the mailbox                */
             while (pevent->OSEventGrp != 0u) {            /* Ready ALL tasks waiting for mailbox      */
                 (void)OS_EventTaskRdy(pevent, (void *)0, OS_STAT_MBOX, OS_STAT_PEND_ABORT);
             }
#if OS_EVENT_NAME_EN > 0u
             pevent->OSEventName    = (INT8U *)(void *)"?";
#endif
             pevent->OSEventType    = OS_EVENT_TYPE_UNUSED;
             pevent->OSEventPtr     = OSEventFreeList;     /* Return Event Control Block to free list  */
             pevent->OSEventCnt     = 0u;
             OSEventFreeList        = pevent;              /* Get next free event control block        */
             OS_EXIT_CRITICAL();
             if (tasks_waiting == OS_TRUE) {               /* Reschedule only if task(s) were waiting  */
                 OS_Sched();                               /* Find highest priority task ready to run  */
             }
             *perr         = OS_ERR_NONE;
             pevent_return = (OS_EVENT *)0;                /* Mailbox has been deleted                 */
             break;

        default:
             OS_EXIT_CRITICAL();
             *perr         = OS_ERR_INVALID_OPT;
             pevent_return = pevent;
             break;
    }
    return (pevent_return);
}
#endif

/*$PAGE*/
/*
*********************************************************************************************************
*                                    PEND ON MAILBOX FOR A MESSAGE
*
* Description: This function waits for a message to be sent to a mailbox
*
* Arguments  : pevent        is a pointer to the event control block associated with the desired mailbox
*
*              timeout       is an optional timeout period (in clock ticks).  If non-zero, your task will
*                            wait for a message to arrive at the mailbox up to the amount of time
*                            specified by this argument.  If you specify 0, however, your task will wait
*                            forever at the specified mailbox or, until a message arrives.
*
*              perr          is a pointer to where an error message will be deposited.  Possible error
*                            messages are:
*
*                            OS_ERR_NONE         The call was successful and your task received a
*                                                message.
*                            OS_ERR_TIMEOUT      A message was not received within the specified 'timeout'.
*                            OS_ERR_PEND_ABORT   The wait on the mailbox was aborted.
*                            OS_ERR_EVENT_TYPE   Invalid event type
*                            OS_ERR_PEND_ISR     If you called this function from an ISR and the result
*                                                would lead to a suspension.
*                            OS_ERR_PEVENT_NULL  If 'pevent' is a NULL pointer
*                            OS_ERR_PEND_LOCKED  If you called this function when the scheduler is locked
*
* Returns    : != (void *)0  is a pointer to the message received
*              == (void *)0  if no message was received or,
*                            if 'pevent' is a NULL pointer or,
*                            if you didn't pass the proper pointer to the event control block.
*********************************************************************************************************
*/
/*$PAGE*/
void  *OSMboxPend (OS_EVENT  *pevent,
                   INT32U     timeout,
                   INT8U     *perr)
{
    void      *pmsg;
#if OS_CRITICAL_METHOD == 3u                          /* Allocate storage for CPU status register      */
    OS_CPU_SR  cpu_sr = 0u;
#endif

#ifdef OS_SAFETY_CRITICAL
    if (perr == (INT8U *)0) {
        OS_SAFETY_CRITICAL_EXCEPTION();
        return ((void *)0);
    }
#endif

#if OS_ARG_CHK_EN > 0u
    if (pevent == (OS_EVENT *)0) {                    /* Validate 'pevent'                             */
        *perr = OS_ERR_PEVENT_NULL;
        return ((void *)0);
    }
#endif
    if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) {  /* Validate event block type                     */
        *perr = OS_ERR_EVENT_TYPE;
        return ((void *)0);
    }
    if (OSIntNesting > 0u) {                          /* See if called from ISR ...                    */
        *perr = OS_ERR_PEND_ISR;                      /* ... can't PEND from an ISR                    */
        return ((void *)0);
    }
    if (OSLockNesting > 0u) {                         /* See if called with scheduler locked ...       */
        *perr = OS_ERR_PEND_LOCKED;                   /* ... can't PEND when locked                    */
        return ((void *)0);
    }
    OS_ENTER_CRITICAL();
    pmsg = pevent->OSEventPtr;
    if (pmsg != (void *)0) {                          /* See if there is already a message             */
        pevent->OSEventPtr = (void *)0;               /* Clear the mailbox                             */
        OS_EXIT_CRITICAL();
        *perr = OS_ERR_NONE;
        return (pmsg);                                /* Return the message received (or NULL)         */
    }
    OSTCBCur->OSTCBStat     |= OS_STAT_MBOX;          /* Message not available, task will pend         */
    OSTCBCur->OSTCBStatPend  = OS_STAT_PEND_OK;
    OSTCBCur->OSTCBDly       = timeout;               /* Load timeout in TCB                           */
    OS_EventTaskWait(pevent);                         /* Suspend task until event or timeout occurs    */
    OS_EXIT_CRITICAL();
    OS_Sched();                                       /* Find next highest priority task ready to run  */
    OS_ENTER_CRITICAL();
    switch (OSTCBCur->OSTCBStatPend) {                /* See if we timed-out or aborted                */
        case OS_STAT_PEND_OK:
             pmsg =  OSTCBCur->OSTCBMsg;
            *perr =  OS_ERR_NONE;
             break;

        case OS_STAT_PEND_ABORT:
             pmsg = (void *)0;
            *perr =  OS_ERR_PEND_ABORT;               /* Indicate that we aborted                      */
             break;

        case OS_STAT_PEND_TO:
        default:
             OS_EventTaskRemove(OSTCBCur, pevent);
             pmsg = (void *)0;
            *perr =  OS_ERR_TIMEOUT;                  /* Indicate that we didn't get event within TO   */
             break;
    }
    OSTCBCur->OSTCBStat          =  OS_STAT_RDY;      /* Set   task  status to ready                   */
    OSTCBCur->OSTCBStatPend      =  OS_STAT_PEND_OK;  /* Clear pend  status                            */
    OSTCBCur->OSTCBEventPtr      = (OS_EVENT  *)0;    /* Clear event pointers                          */
#if (OS_EVENT_MULTI_EN > 0u)
    OSTCBCur->OSTCBEventMultiPtr = (OS_EVENT **)0;
#endif
    OSTCBCur->OSTCBMsg           = (void      *)0;    /* Clear  received message                       */
    OS_EXIT_CRITICAL();
    return (pmsg);                                    /* Return received message                       */
}
/*$PAGE*/
/*
*********************************************************************************************************
*                                     ABORT WAITING ON A MESSAGE MAILBOX
*
* Description: This function aborts & readies any tasks currently waiting on a mailbox.  This function
*              should be used to fault-abort the wait on the mailbox, rather than to normally signal
*              the mailbox via OSMboxPost() or OSMboxPostOpt().
*
* Arguments  : pevent        is a pointer to the event control block associated with the desired mailbox.
*
*              opt           determines the type of ABORT performed:
*                            OS_PEND_OPT_NONE         ABORT wait for a single task (HPT) waiting on the
*                                                     mailbox
*                            OS_PEND_OPT_BROADCAST    ABORT wait for ALL tasks that are  waiting on the
*                                                     mailbox
*
*              perr          is a pointer to where an error message will be deposited.  Possible error
*                            messages are:
*
*                            OS_ERR_NONE         No tasks were     waiting on the mailbox.
*                            OS_ERR_PEND_ABORT   At least one task waiting on the mailbox was readied
*                                                and informed of the aborted wait; check return value
*                                                for the number of tasks whose wait on the mailbox
*                                                was aborted.
*                            OS_ERR_EVENT_TYPE   If you didn't pass a pointer to a mailbox.
*                            OS_ERR_PEVENT_NULL  If 'pevent' is a NULL pointer.
*
* Returns    : == 0          if no tasks were waiting on the mailbox, or upon error.
*              >  0          if one or more tasks waiting on the mailbox are now readied and informed.
*********************************************************************************************************
*/

#if OS_MBOX_PEND_ABORT_EN > 0u
INT8U  OSMboxPendAbort (OS_EVENT  *pevent,
                        INT8U      opt,
                        INT8U     *perr)
{
    INT8U      nbr_tasks;
#if OS_CRITICAL_METHOD == 3u                               /* Allocate storage for CPU status register */
    OS_CPU_SR  cpu_sr = 0u;
#endif

#ifdef OS_SAFETY_CRITICAL
    if (perr == (INT8U *)0) {
        OS_SAFETY_CRITICAL_EXCEPTION();
        return (0u);
    }
#endif

#if OS_ARG_CHK_EN > 0u
    if (pevent == (OS_EVENT *)0) {                         /* Validate 'pevent'                        */
        *perr = OS_ERR_PEVENT_NULL;
        return (0u);
    }
#endif
    if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) {       /* Validate event block type                */
        *perr = OS_ERR_EVENT_TYPE;
        return (0u);
    }
    OS_ENTER_CRITICAL();
    if (pevent->OSEventGrp != 0u) {                        /* See if any task waiting on mailbox?      */
        nbr_tasks = 0u;
        switch (opt) {
            case OS_PEND_OPT_BROADCAST:                    /* Do we need to abort ALL waiting tasks?   */
                 while (pevent->OSEventGrp != 0u) {        /* Yes, ready ALL tasks waiting on mailbox  */
                     (void)OS_EventTaskRdy(pevent, (void *)0, OS_STAT_MBOX, OS_STAT_PEND_ABORT);
                     nbr_tasks++;
                 }
                 break;

            case OS_PEND_OPT_NONE:
            default:                                       /* No,  ready HPT       waiting on mailbox  */
                 (void)OS_EventTaskRdy(pevent, (void *)0, OS_STAT_MBOX, OS_STAT_PEND_ABORT);
                 nbr_tasks++;
                 break;
        }
        OS_EXIT_CRITICAL();
        OS_Sched();                                        /* Find HPT ready to run                    */
        *perr = OS_ERR_PEND_ABORT;
        return (nbr_tasks);
    }
    OS_EXIT_CRITICAL();
    *perr = OS_ERR_NONE;
    return (0u);                                           /* No tasks waiting on mailbox              */
}
#endif

/*$PAGE*/
/*
*********************************************************************************************************
*                                      POST MESSAGE TO A MAILBOX
*
* Description: This function sends a message to a mailbox
*
* Arguments  : pevent        is a pointer to the event control block associated with the desired mailbox
*
*              pmsg          is a pointer to the message to send.  You MUST NOT send a NULL pointer.
*
* Returns    : OS_ERR_NONE          The call was successful and the message was sent
*              OS_ERR_MBOX_FULL     If the mailbox already contains a message.  You can can only send one
*                                   message at a time and thus, the message MUST be consumed before you
*                                   are allowed to send another one.
*              OS_ERR_EVENT_TYPE    If you are attempting to post to a non mailbox.
*              OS_ERR_PEVENT_NULL   If 'pevent' is a NULL pointer
*              OS_ERR_POST_NULL_PTR If you are attempting to post a NULL pointer
*
* Note(s)    : 1) HPT means Highest Priority Task
*********************************************************************************************************
*/

#if OS_MBOX_POST_EN > 0u
INT8U  OSMboxPost (OS_EVENT  *pevent,
                   void      *pmsg)
{
#if OS_CRITICAL_METHOD == 3u                          /* Allocate storage for CPU status register      */
    OS_CPU_SR  cpu_sr = 0u;
#endif

#if OS_ARG_CHK_EN > 0u
    if (pevent == (OS_EVENT *)0) {                    /* Validate 'pevent'                             */
        return (OS_ERR_PEVENT_NULL);
    }
    if (pmsg == (void *)0) {                          /* Make sure we are not posting a NULL pointer   */
        return (OS_ERR_POST_NULL_PTR);
    }
#endif
    if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) {  /* Validate event block type                     */
        return (OS_ERR_EVENT_TYPE);
    }
    OS_ENTER_CRITICAL();
    if (pevent->OSEventGrp != 0u) {                   /* See if any task pending on mailbox            */
                                                      /* Ready HPT waiting on event                    */
        (void)OS_EventTaskRdy(pevent, pmsg, OS_STAT_MBOX, OS_STAT_PEND_OK);
        OS_EXIT_CRITICAL();
        OS_Sched();                                   /* Find highest priority task ready to run       */
        return (OS_ERR_NONE);
    }
    if (pevent->OSEventPtr != (void *)0) {            /* Make sure mailbox doesn't already have a msg  */
        OS_EXIT_CRITICAL();
        return (OS_ERR_MBOX_FULL);
    }
    pevent->OSEventPtr = pmsg;                        /* Place message in mailbox                      */
    OS_EXIT_CRITICAL();
    return (OS_ERR_NONE);
}
#endif

/*$PAGE*/
/*
*********************************************************************************************************
*                                      POST MESSAGE TO A MAILBOX
*
* Description: This function sends a message to a mailbox
*
* Arguments  : pevent        is a pointer to the event control block associated with the desired mailbox
*
*              pmsg          is a pointer to the message to send.  You MUST NOT send a NULL pointer.
*
*              opt           determines the type of POST performed:
*                            OS_POST_OPT_NONE         POST to a single waiting task
*                                                     (Identical to OSMboxPost())
*                            OS_POST_OPT_BROADCAST    POST to ALL tasks that are waiting on the mailbox
*
*                            OS_POST_OPT_NO_SCHED     Indicates that the scheduler will NOT be invoked
*
* Returns    : OS_ERR_NONE          The call was successful and the message was sent
*              OS_ERR_MBOX_FULL     If the mailbox already contains a message.  You can can only send one
*                                   message at a time and thus, the message MUST be consumed before you
*                                   are allowed to send another one.
*              OS_ERR_EVENT_TYPE    If you are attempting to post to a non mailbox.
*              OS_ERR_PEVENT_NULL   If 'pevent' is a NULL pointer
*              OS_ERR_POST_NULL_PTR If you are attempting to post a NULL pointer
*
* Note(s)    : 1) HPT means Highest Priority Task
*
* Warning    : Interrupts can be disabled for a long time if you do a 'broadcast'.  In fact, the
*              interrupt disable time is proportional to the number of tasks waiting on the mailbox.
*********************************************************************************************************
*/

#if OS_MBOX_POST_OPT_EN > 0u
INT8U  OSMboxPostOpt (OS_EVENT  *pevent,
                      void      *pmsg,
                      INT8U      opt)
{
#if OS_CRITICAL_METHOD == 3u                          /* Allocate storage for CPU status register      */
    OS_CPU_SR  cpu_sr = 0u;
#endif

#if OS_ARG_CHK_EN > 0u
    if (pevent == (OS_EVENT *)0) {                    /* Validate 'pevent'                             */
        return (OS_ERR_PEVENT_NULL);
    }
    if (pmsg == (void *)0) {                          /* Make sure we are not posting a NULL pointer   */
        return (OS_ERR_POST_NULL_PTR);
    }
#endif
    if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) {  /* Validate event block type                     */
        return (OS_ERR_EVENT_TYPE);
    }
    OS_ENTER_CRITICAL();
    if (pevent->OSEventGrp != 0u) {                   /* See if any task pending on mailbox            */
        if ((opt & OS_POST_OPT_BROADCAST) != 0x00u) { /* Do we need to post msg to ALL waiting tasks ? */
            while (pevent->OSEventGrp != 0u) {        /* Yes, Post to ALL tasks waiting on mailbox     */
                (void)OS_EventTaskRdy(pevent, pmsg, OS_STAT_MBOX, OS_STAT_PEND_OK);
            }
        } else {                                      /* No,  Post to HPT waiting on mbox              */
            (void)OS_EventTaskRdy(pevent, pmsg, OS_STAT_MBOX, OS_STAT_PEND_OK);
        }
        OS_EXIT_CRITICAL();
        if ((opt & OS_POST_OPT_NO_SCHED) == 0u) {     /* See if scheduler needs to be invoked          */
            OS_Sched();                               /* Find HPT ready to run                         */
        }
        return (OS_ERR_NONE);
    }
    if (pevent->OSEventPtr != (void *)0) {            /* Make sure mailbox doesn't already have a msg  */
        OS_EXIT_CRITICAL();
        return (OS_ERR_MBOX_FULL);
    }
    pevent->OSEventPtr = pmsg;                        /* Place message in mailbox                      */
    OS_EXIT_CRITICAL();
    return (OS_ERR_NONE);
}
#endif

/*$PAGE*/
/*
*********************************************************************************************************
*                                       QUERY A MESSAGE MAILBOX
*
* Description: This function obtains information about a message mailbox.
*
* Arguments  : pevent        is a pointer to the event control block associated with the desired mailbox
*
*              p_mbox_data   is a pointer to a structure that will contain information about the message
*                            mailbox.
*
* Returns    : OS_ERR_NONE         The call was successful and the message was sent
*              OS_ERR_EVENT_TYPE   If you are attempting to obtain data from a non mailbox.
*              OS_ERR_PEVENT_NULL  If 'pevent'      is a NULL pointer
*              OS_ERR_PDATA_NULL   If 'p_mbox_data' is a NULL pointer
*********************************************************************************************************
*/

#if OS_MBOX_QUERY_EN > 0u
INT8U  OSMboxQuery (OS_EVENT      *pevent,
                    OS_MBOX_DATA  *p_mbox_data)
{
    INT8U       i;
    OS_PRIO    *psrc;
    OS_PRIO    *pdest;
#if OS_CRITICAL_METHOD == 3u                               /* Allocate storage for CPU status register */
    OS_CPU_SR   cpu_sr = 0u;
#endif

#if OS_ARG_CHK_EN > 0u
    if (pevent == (OS_EVENT *)0) {                         /* Validate 'pevent'                        */
        return (OS_ERR_PEVENT_NULL);
    }
    if (p_mbox_data == (OS_MBOX_DATA *)0) {                /* Validate 'p_mbox_data'                   */
        return (OS_ERR_PDATA_NULL);
    }
#endif
    if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) {       /* Validate event block type                */
        return (OS_ERR_EVENT_TYPE);
    }
    OS_ENTER_CRITICAL();
    p_mbox_data->OSEventGrp = pevent->OSEventGrp;          /* Copy message mailbox wait list           */
    psrc                    = &pevent->OSEventTbl[0];
    pdest                   = &p_mbox_data->OSEventTbl[0];
    for (i = 0u; i < OS_EVENT_TBL_SIZE; i++) {
        *pdest++ = *psrc++;
    }
    p_mbox_data->OSMsg = pevent->OSEventPtr;               /* Get message from mailbox                 */
    OS_EXIT_CRITICAL();
    return (OS_ERR_NONE);
}
#endif                                                     /* OS_MBOX_QUERY_EN                         */
#endif                                                     /* OS_MBOX_EN                               */
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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