OS_Sched();                                        /* Find HPT ready to run                    */
        *perr = OS_ERR_PEND_ABORT;
        return (nbr_tasks);
    }
    OS_EXIT_CRITICAL();
    *perr = OS_ERR_NONE;
    return (0);                                            /* 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 > 0
INT8U  OSMboxPost (OS_EVENT *pevent, void *pmsg)
{
#if OS_CRITICAL_METHOD == 3                           /* Allocate storage for CPU status register      */
    OS_CPU_SR  cpu_sr = 0;
#endif



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



#if OS_ARG_CHK_EN > 0
    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 != 0) {                    /* See if any task pending on mailbox            */
        if ((opt & OS_POST_OPT_BROADCAST) != 0x00) {  /* Do we need to post msg to ALL waiting tasks ? */
            while (pevent->OSEventGrp != 0) {         /* 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) == 0) {	  /* 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 > 0
INT8U  OSMboxQuery (OS_EVENT *pevent, OS_MBOX_DATA *p_mbox_data)
{
    INT8U      i;
#if OS_LOWEST_PRIO <= 63
    INT8U     *psrc;
    INT8U     *pdest;
#else
    INT16U    *psrc;
    INT16U    *pdest;
#endif
#if OS_CRITICAL_METHOD == 3                                /* Allocate storage for CPU status register */
    OS_CPU_SR  cpu_sr = 0;
#endif



#if OS_ARG_CHK_EN > 0
    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 = 0; 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                               */