os_mbox.c
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上传日期:2016-07-26
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- /*
- *********************************************************************************************************
- * uC/OS-II
- * The Real-Time Kernel
- * MESSAGE MAILBOX MANAGEMENT
- *
- * (c) Copyright 1992-2009, Micrium, Weston, FL
- * All Rights Reserved
- *
- * File : OS_MBOX.C
- * By : Jean J. Labrosse
- * Version : V2.88
- *
- * 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 Micri祄 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.
- *********************************************************************************************************
- */
- #ifndef OS_MASTER_FILE
- #include <ucos_ii.h>
- #endif
- #if OS_MBOX_EN > 0
- /*
- *********************************************************************************************************
- * 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 > 0
- void *OSMboxAccept (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 ((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
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * CREATE A MESSAGE MAILBOX
- *
- * Description: This function creates a message mailbox if free event control blocks are available.
- *
- * Arguments : pmsg is a pointer to a message that you wish to deposit in the mailbox. If
- * you set this value to the NULL pointer (i.e. (void *)0) then the mailbox
- * will be considered empty.
- *
- * Returns : != (OS_EVENT *)0 is a pointer to the event control clock (OS_EVENT) associated with the
- * created mailbox
- * == (OS_EVENT *)0 if no event control blocks were available
- *********************************************************************************************************
- */
- OS_EVENT *OSMboxCreate (void *pmsg)
- {
- OS_EVENT *pevent;
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr = 0;
- #endif
- if (OSIntNesting > 0) { /* See if called from ISR ... */
- return ((OS_EVENT *)0); /* ... can't CREATE from an ISR */
- }
- OS_ENTER_CRITICAL();
- pevent = OSEventFreeList; /* Get next free event control block */
- if (OSEventFreeList != (OS_EVENT *)0) { /* See if pool of free ECB pool was empty */
- OSEventFreeList = (OS_EVENT *)OSEventFreeList->OSEventPtr;
- }
- OS_EXIT_CRITICAL();
- if (pevent != (OS_EVENT *)0) {
- pevent->OSEventType = OS_EVENT_TYPE_MBOX;
- pevent->OSEventCnt = 0;
- pevent->OSEventPtr = pmsg; /* Deposit message in event control block */
- #if OS_EVENT_NAME_EN > 0
- pevent->OSEventName = "?"; /* Unknown name */
- #endif
- OS_EventWaitListInit(pevent);
- }
- return (pevent); /* Return pointer to event control block */
- }
- /*$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.
- *********************************************************************************************************
- */
- #if OS_MBOX_DEL_EN > 0
- OS_EVENT *OSMboxDel (OS_EVENT *pevent,
- INT8U opt,
- INT8U *perr)
- {
- BOOLEAN tasks_waiting;
- OS_EVENT *pevent_return;
- #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 (perr == (INT8U *)0) { /* Validate 'perr' */
- return (pevent);
- }
- 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 > 0) { /* See if called from ISR ... */
- *perr = OS_ERR_DEL_ISR; /* ... can't DELETE from an ISR */
- return (pevent);
- }
- OS_ENTER_CRITICAL();
- if (pevent->OSEventGrp != 0) { /* 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 > 0
- pevent->OSEventName = "?"; /* Unknown name */
- #endif
- pevent->OSEventType = OS_EVENT_TYPE_UNUSED;
- pevent->OSEventPtr = OSEventFreeList; /* Return Event Control Block to free list */
- pevent->OSEventCnt = 0;
- 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 != 0) { /* Ready ALL tasks waiting for mailbox */
- (void)OS_EventTaskRdy(pevent, (void *)0, OS_STAT_MBOX, OS_STAT_PEND_OK);
- }
- #if OS_EVENT_NAME_EN > 0
- pevent->OSEventName = "?"; /* Unknown name */
- #endif
- pevent->OSEventType = OS_EVENT_TYPE_UNUSED;
- pevent->OSEventPtr = OSEventFreeList; /* Return Event Control Block to free list */
- pevent->OSEventCnt = 0;
- 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 == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr = 0;
- #endif
- #if OS_ARG_CHK_EN > 0
- if (perr == (INT8U *)0) { /* Validate 'perr' */
- return ((void *)0);
- }
- 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 > 0) { /* See if called from ISR ... */
- *perr = OS_ERR_PEND_ISR; /* ... can't PEND from an ISR */
- return ((void *)0);
- }
- if (OSLockNesting > 0) { /* 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 > 0)
- 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 > 0
- INT8U OSMboxPendAbort (OS_EVENT *pevent,
- INT8U opt,
- INT8U *perr)
- {
- INT8U nbr_tasks;
- #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 (perr == (INT8U *)0) { /* Validate 'perr' */
- return (0);
- }
- if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
- *perr = OS_ERR_PEVENT_NULL;
- return (0);
- }
- #endif
- if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) { /* Validate event block type */
- *perr = OS_ERR_EVENT_TYPE;
- return (0);
- }
- OS_ENTER_CRITICAL();
- if (pevent->OSEventGrp != 0) { /* See if any task waiting on mailbox? */
- nbr_tasks = 0;
- switch (opt) {
- case OS_PEND_OPT_BROADCAST: /* Do we need to abort ALL waiting tasks? */
- while (pevent->OSEventGrp != 0) { /* 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 (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 */