English
OS_MBOX.lst
资源名称：QFI4ddQe.rar [点击查看]
上传用户：tzjinxin1
上传日期：2022-08-08
资源大小：272k
文件大小：32k
源码类别：
嵌入式/单片机编程
开发平台：
Visual C++
- C51 COMPILER V8.02 OS_MBOX 06/22/2006 11:44:36 PAGE 1
- C51 COMPILER V8.02, COMPILATION OF MODULE OS_MBOX
- OBJECT MODULE PLACED IN .objOS_MBOX.obj
- COMPILER INVOKED BY: C:KeilC51BINC51.EXE uCosiiOS_MBOX.C LARGE BROWSE DEBUG OBJECTEXTEND PRINT(.lstOS_MBOX.lst) O
- -BJECT(.objOS_MBOX.obj)
- line level source
- 1 /*
- 2 *********************************************************************************************************
- 3 * uC/OS-II
- 4 * The Real-Time Kernel
- 5 * MESSAGE MAILBOX MANAGEMENT
- 6 *
- 7 * (c) Copyright 1992-2001, Jean J. Labrosse, Weston, FL
- 8 * All Rights Reserved
- 9 *
- 10 * File : OS_MBOX.C
- 11 * By : Jean J. Labrosse
- 12 *********************************************************************************************************
- 13 */
- 14
- 15 #ifndef OS_MASTER_FILE
- 16 #include "sourceincludes.h"
- 17 #endif
- 18
- 19 #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) reentrant
- {
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr;
- #endif
- void *msg;
- #if OS_ARG_CHK_EN > 0
- if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
- return ((void *)0);
- }
- if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) { /* Validate event block type */
- return ((void *)0);
- }
- #endif
- OS_ENTER_CRITICAL();
- C51 COMPILER V8.02 OS_MBOX 06/22/2006 11:44:36 PAGE 2
- msg = pevent->OSEventPtr;
- pevent->OSEventPtr = (void *)0; /* Clear the mailbox */
- OS_EXIT_CRITICAL();
- return (msg); /* Return the message received (or NULL) */
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * CREATE A MESSAGE MAILBOX
- *
- * Description: This function creates a message mailbox if free event control blocks are available.
- *
- * Arguments : msg is a pointer to a message that you wish to deposit in the mailbox. If
- * you set this value to the NULL pointer (i.e. (void *)0) then the mailbox
- * will be considered empty.
- *
- * Returns : != (OS_EVENT *)0 is a pointer to the event control clock (OS_EVENT) associated with the
- * created mailbox
- * == (OS_EVENT *)0 if no event control blocks were available
- *********************************************************************************************************
- */
- OS_EVENT *OSMboxCreate (void *msg) reentrant
- {
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr;
- #endif
- OS_EVENT *pevent;
- if (OSIntNesting > 0) { /* See if called from ISR ... */
- return ((OS_EVENT *)0); /* ... can't CREATE from an ISR */
- }
- OS_ENTER_CRITICAL();
- pevent = OSEventFreeList; /* Get next free event control block */
- if (OSEventFreeList != (OS_EVENT *)0) { /* See if pool of free ECB pool was empty */
- OSEventFreeList = (OS_EVENT *)OSEventFreeList->OSEventPtr;
- }
- OS_EXIT_CRITICAL();
- if (pevent != (OS_EVENT *)0) {
- pevent->OSEventType = OS_EVENT_TYPE_MBOX;
- pevent->OSEventPtr = msg; /* Deposit message in event control block */
- OS_EventWaitListInit(pevent);
- }
- return (pevent); /* Return pointer to event control block */
- }
- /*$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.
- *
- C51 COMPILER V8.02 OS_MBOX 06/22/2006 11:44:36 PAGE 3
- * err is a pointer to an error code that can contain one of the following values:
- * OS_NO_ERR 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 unless
- * they check 'pevent' to see that it's a NULL pointer.
- * 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 *err) reentrant
- {
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr;
- #endif
- BOOLEAN tasks_waiting;
- if (OSIntNesting > 0) { /* See if called from ISR ... */
- *err = OS_ERR_DEL_ISR; /* ... can't DELETE from an ISR */
- return (pevent);
- }
- #if OS_ARG_CHK_EN > 0
- if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
- *err = OS_ERR_PEVENT_NULL;
- return (pevent);
- }
- if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) { /* Validate event block type */
- *err = OS_ERR_EVENT_TYPE;
- return (pevent);
- }
- #endif
- OS_ENTER_CRITICAL();
- if (pevent->OSEventGrp != 0x00) { /* See if any tasks waiting on mailbox */
- tasks_waiting = TRUE; /* Yes */
- } else {
- tasks_waiting = FALSE; /* No */
- }
- switch (opt) {
- case OS_DEL_NO_PEND: /* Delete mailbox only if no task waiting */
- if (tasks_waiting == FALSE) {
- pevent->OSEventType = OS_EVENT_TYPE_UNUSED;
- pevent->OSEventPtr = OSEventFreeList; /* Return Event Control Block to free list */
- OSEventFreeList = pevent; /* Get next free event control block */
- OS_EXIT_CRITICAL();
- *err = OS_NO_ERR;
- return ((OS_EVENT *)0); /* Mailbox has been deleted */
- } else {
- C51 COMPILER V8.02 OS_MBOX 06/22/2006 11:44:36 PAGE 4
- OS_EXIT_CRITICAL();
- *err = OS_ERR_TASK_WAITING;
- return (pevent);
- }
- case OS_DEL_ALWAYS: /* Always delete the mailbox */
- while (pevent->OSEventGrp != 0x00) { /* Ready ALL tasks waiting for mailbox */
- OS_EventTaskRdy(pevent, (void *)0, OS_STAT_MBOX);
- }
- pevent->OSEventType = OS_EVENT_TYPE_UNUSED;
- pevent->OSEventPtr = OSEventFreeList; /* Return Event Control Block to free list */
- OSEventFreeList = pevent; /* Get next free event control block */
- OS_EXIT_CRITICAL();
- if (tasks_waiting == TRUE) { /* Reschedule only if task(s) were waiting */
- OS_Sched(); /* Find highest priority task ready to run */
- }
- *err = OS_NO_ERR;
- return ((OS_EVENT *)0); /* Mailbox has been deleted */
- default:
- OS_EXIT_CRITICAL();
- *err = OS_ERR_INVALID_OPT;
- return (pevent);
- }
- }
- #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.
- *
- * err is a pointer to where an error message will be deposited. Possible error
- * messages are:
- *
- * OS_NO_ERR The call was successful and your task received a
- * message.
- * OS_TIMEOUT A message was not received within the specified timeout
- * 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
- *
- * 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.
- *********************************************************************************************************
- */
- void *OSMboxPend (OS_EVENT *pevent, INT16U timeout, INT8U *err) reentrant
- {
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- C51 COMPILER V8.02 OS_MBOX 06/22/2006 11:44:36 PAGE 5
- OS_CPU_SR cpu_sr;
- #endif
- void *msg;
- if (OSIntNesting > 0) { /* See if called from ISR ... */
- *err = OS_ERR_PEND_ISR; /* ... can't PEND from an ISR */
- return ((void *)0);
- }
- #if OS_ARG_CHK_EN > 0
- if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
- *err = OS_ERR_PEVENT_NULL;
- return ((void *)0);
- }
- if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) { /* Validate event block type */
- *err = OS_ERR_EVENT_TYPE;
- return ((void *)0);
- }
- #endif
- OS_ENTER_CRITICAL();
- msg = pevent->OSEventPtr;
- if (msg != (void *)0) { /* See if there is already a message */
- pevent->OSEventPtr = (void *)0; /* Clear the mailbox */
- OS_EXIT_CRITICAL();
- *err = OS_NO_ERR;
- return (msg); /* Return the message received (or NULL) */
- }
- OSTCBCur->OSTCBStat |= OS_STAT_MBOX; /* Message not available, task will pend */
- 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();
- msg = OSTCBCur->OSTCBMsg;
- if (msg != (void *)0) { /* See if we were given the message */
- OSTCBCur->OSTCBMsg = (void *)0; /* Yes, clear message received */
- OSTCBCur->OSTCBStat = OS_STAT_RDY;
- OSTCBCur->OSTCBEventPtr = (OS_EVENT *)0; /* No longer waiting for event */
- OS_EXIT_CRITICAL();
- *err = OS_NO_ERR;
- return (msg); /* Return the message received */
- }
- OS_EventTO(pevent); /* Timed out, Make task ready */
- OS_EXIT_CRITICAL();
- *err = OS_TIMEOUT; /* Indicate that a timeout occured */
- return ((void *)0); /* Return a NULL message */
- }
- /*$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
- *
- * msg is a pointer to the message to send. You MUST NOT send a NULL pointer.
- *
- * Returns : OS_NO_ERR The call was successful and the message was sent
- * OS_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.
- C51 COMPILER V8.02 OS_MBOX 06/22/2006 11:44:36 PAGE 6
- * 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
- *********************************************************************************************************
- */
- #if OS_MBOX_POST_EN > 0
- INT8U OSMboxPost (OS_EVENT *pevent, void *msg) reentrant
- {
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr;
- #endif
- #if OS_ARG_CHK_EN > 0
- if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
- return (OS_ERR_PEVENT_NULL);
- }
- if (msg == (void *)0) { /* Make sure we are not posting a NULL pointer */
- return (OS_ERR_POST_NULL_PTR);
- }
- if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) { /* Validate event block type */
- return (OS_ERR_EVENT_TYPE);
- }
- #endif
- OS_ENTER_CRITICAL();
- if (pevent->OSEventGrp != 0x00) { /* See if any task pending on mailbox */
- OS_EventTaskRdy(pevent, msg, OS_STAT_MBOX); /* Ready highest priority task waiting on event */
- OS_EXIT_CRITICAL();
- OS_Sched(); /* Find highest priority task ready to run */
- return (OS_NO_ERR);
- }
- if (pevent->OSEventPtr != (void *)0) { /* Make sure mailbox doesn't already have a msg */
- OS_EXIT_CRITICAL();
- return (OS_MBOX_FULL);
- }
- pevent->OSEventPtr = msg; /* Place message in mailbox */
- OS_EXIT_CRITICAL();
- return (OS_NO_ERR);
- }
- #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
- *
- * msg 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
- *
- * Returns : OS_NO_ERR The call was successful and the message was sent
- * OS_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.
- C51 COMPILER V8.02 OS_MBOX 06/22/2006 11:44:36 PAGE 7
- * 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
- *
- * 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 *msg, INT8U opt) reentrant
- {
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr;
- #endif
- #if OS_ARG_CHK_EN > 0
- if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
- return (OS_ERR_PEVENT_NULL);
- }
- if (msg == (void *)0) { /* Make sure we are not posting a NULL pointer */
- return (OS_ERR_POST_NULL_PTR);
- }
- if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) { /* Validate event block type */
- return (OS_ERR_EVENT_TYPE);
- }
- #endif
- OS_ENTER_CRITICAL();
- if (pevent->OSEventGrp != 0x00) { /* 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 != 0x00) { /* Yes, Post to ALL tasks waiting on mailbox */
- -
- OS_EventTaskRdy(pevent, msg, OS_STAT_MBOX);
- }
- } else {
- OS_EventTaskRdy(pevent, msg, OS_STAT_MBOX); /* No, Post to HPT waiting on mbox */
- }
- OS_EXIT_CRITICAL();
- OS_Sched(); /* Find highest priority task ready to run */
- return (OS_NO_ERR);
- }
- if (pevent->OSEventPtr != (void *)0) { /* Make sure mailbox doesn't already have a msg */
- OS_EXIT_CRITICAL();
- return (OS_MBOX_FULL);
- }
- pevent->OSEventPtr = msg; /* Place message in mailbox */
- OS_EXIT_CRITICAL();
- return (OS_NO_ERR);
- }
- #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
- *
- * ppdata is a pointer to a structure that will contain information about the message
- C51 COMPILER V8.02 OS_MBOX 06/22/2006 11:44:36 PAGE 8
- * mailbox.
- *
- * Returns : OS_NO_ERR 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
- *********************************************************************************************************
- */
- #if OS_MBOX_QUERY_EN > 0
- INT8U OSMboxQuery (OS_EVENT *pevent, OS_MBOX_DATA *ppdata) reentrant
- {
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr;
- #endif
- INT8U *psrc;
- INT8U *pdest;
- #if OS_ARG_CHK_EN > 0
- if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
- return (OS_ERR_PEVENT_NULL);
- }
- if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) { /* Validate event block type */
- return (OS_ERR_EVENT_TYPE);
- }
- #endif
- OS_ENTER_CRITICAL();
- ppdata->OSEventGrp = pevent->OSEventGrp; /* Copy message mailbox wait list */
- psrc = &pevent->OSEventTbl[0];
- pdest = &ppdata->OSEventTbl[0];
- #if OS_EVENT_TBL_SIZE > 0
- *pdest++ = *psrc++;
- #endif
- #if OS_EVENT_TBL_SIZE > 1
- *pdest++ = *psrc++;
- #endif
- #if OS_EVENT_TBL_SIZE > 2
- *pdest++ = *psrc++;
- #endif
- #if OS_EVENT_TBL_SIZE > 3
- *pdest++ = *psrc++;
- #endif
- #if OS_EVENT_TBL_SIZE > 4
- *pdest++ = *psrc++;
- #endif
- #if OS_EVENT_TBL_SIZE > 5
- *pdest++ = *psrc++;
- #endif
- #if OS_EVENT_TBL_SIZE > 6
- *pdest++ = *psrc++;
- #endif
- #if OS_EVENT_TBL_SIZE > 7
- *pdest = *psrc;
- #endif
- C51 COMPILER V8.02 OS_MBOX 06/22/2006 11:44:36 PAGE 9
- ppdata->OSMsg = pevent->OSEventPtr; /* Get message from mailbox */
- OS_EXIT_CRITICAL();
- return (OS_NO_ERR);
- }
- #endif /* OS_MBOX_QUERY_EN */
- #endif /* OS_MBOX_EN */
- MODULE INFORMATION: STATIC OVERLAYABLE
- CODE SIZE = ---- ----
- CONSTANT SIZE = ---- ----
- XDATA SIZE = ---- ----
- PDATA SIZE = ---- ----
- DATA SIZE = ---- ----
- IDATA SIZE = ---- ----
- BIT SIZE = ---- ----
- END OF MODULE INFORMATION.
- C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
