📄 os_mbox.lst
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C51 COMPILER V7.50 OS_MBOX 10/31/2005 15:29:41 PAGE 1
C51 COMPILER V7.50, COMPILATION OF MODULE OS_MBOX
OBJECT MODULE PLACED IN OS_MBOX.OBJ
COMPILER INVOKED BY: C:\Program Files\keilc51\C51\BIN\C51.EXE OS_MBOX.C LARGE BROWSE DEBUG OBJECTEXTEND
line level source
1 /*
2 *********************************************************************************************************
3 * uC/OS-II
4 * The Real-Time Kernel
5 * MESSAGE MAILBOX MANAGEMENT
6 *
7 * (c) Copyright 1992-1998, Jean J. Labrosse, Plantation, FL
8 * All Rights Reserved
9 *
10 * V2.00
11 *
12 * File : OS_MBOX.C
13 * By : Jean J. Labrosse
14 *********************************************************************************************************
15 */
16
17 #ifndef OS_MASTER_FILE
18 #include "includes.h"
19 #endif
20
21 #if OS_MBOX_EN
//无等待地从一个邮箱中得到消息
#if OS_Mbox_Accept_EN
void *OSMboxAccept (OS_EVENT *pevent)reentrant
{
void *msg;
OS_ENTER_CRITICAL();
if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) { /* Validate event block type */
OS_EXIT_CRITICAL();
return ((void *)0);
}
msg = pevent->OSEventPtr;
if (msg != (void *)0) { /* See if there is already a message */
pevent->OSEventPtr = (void *)0; /* Clear the mailbox */
}
OS_EXIT_CRITICAL();
return (msg); /* Return the message received (or NULL) */
}
#endif
//建立一个邮箱
#if OS_Mbox_Create_EN
OS_EVENT *OSMboxCreate (void *msg)reentrant
{
OS_EVENT *pevent;
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();
C51 COMPILER V7.50 OS_MBOX 10/31/2005 15:29:41 PAGE 2
if (pevent != (OS_EVENT *)0) {
pevent->OSEventType = OS_EVENT_TYPE_MBOX;
pevent->OSEventPtr = msg; /* Deposit message in event control block */
OSEventWaitListInit(pevent);
}
return (pevent); /* Return pointer to event control block */
}
#endif
//等待一个邮箱中的消息
#if OS_Mbox_Pend_EN
void *OSMboxPend (OS_EVENT *pevent, INT16U timeout, INT8U *err)reentrant
{
void *msg;
OS_ENTER_CRITICAL();
if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) { /* Validate event block type */
OS_EXIT_CRITICAL();
*err = OS_ERR_EVENT_TYPE;
return ((void *)0);
}
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;
} else if (OSIntNesting > 0) { /* See if called from ISR ... */
OS_EXIT_CRITICAL(); /* ... can't PEND from an ISR */
*err = OS_ERR_PEND_ISR;
} else {
OSTCBCur->OSTCBStat |= OS_STAT_MBOX; /* Message not available, task will pend */
OSTCBCur->OSTCBDly = timeout; /* Load timeout in TCB */
OSEventTaskWait(pevent); /* Suspend task until event or timeout occurs */
OS_EXIT_CRITICAL();
OSSched(); /* Find next highest priority task ready to run */
OS_ENTER_CRITICAL();
if ((msg = OSTCBCur->OSTCBMsg) != (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;
} else if (OSTCBCur->OSTCBStat & OS_STAT_MBOX) { /* If status is not OS_STAT_RDY, timed out */
OSEventTO(pevent); /* Make task ready */
OS_EXIT_CRITICAL();
msg = (void *)0; /* Set message contents to NULL */
*err = OS_TIMEOUT; /* Indicate that a timeout occured */
} else {
msg = pevent->OSEventPtr; /* Message received */
pevent->OSEventPtr = (void *)0; /* Clear the mailbox */
OSTCBCur->OSTCBEventPtr = (OS_EVENT *)0;
OS_EXIT_CRITICAL();
*err = OS_NO_ERR;
}
}
return (msg); /* Return the message received (or NULL) */
}
#endif
//发送一个消息到邮箱
#if OS_Mbox_Post_EN
C51 COMPILER V7.50 OS_MBOX 10/31/2005 15:29:41 PAGE 3
INT8U OSMboxPost (OS_EVENT *pevent, void *msg)reentrant
{
OS_ENTER_CRITICAL();
if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) { /* Validate event block type */
OS_EXIT_CRITICAL();
return (OS_ERR_EVENT_TYPE);
}
if (pevent->OSEventGrp) { /* See if any task pending on mailbox */
OSEventTaskRdy(pevent, msg, OS_STAT_MBOX); /* Ready highest priority task waiting on event */
OS_EXIT_CRITICAL();
OSSched(); /* Find highest priority task ready to run */
return (OS_NO_ERR);
} else {
if (pevent->OSEventPtr != (void *)0) { /* Make sure mailbox doesn't already have a msg */
OS_EXIT_CRITICAL();
return (OS_MBOX_FULL);
} else {
pevent->OSEventPtr = msg; /* Place message in mailbox */
OS_EXIT_CRITICAL();
return (OS_NO_ERR);
}
}
}
#endif
//查询一个邮箱的状态
#if OS_Mbox_Query_EN
INT8U OSMboxQuery (OS_EVENT *pevent, OS_MBOX_DATA *dataptr)reentrant
{
INT8U i;
INT8U *psrc;
INT8U *pdest;
OS_ENTER_CRITICAL();
if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) { /* Validate event block type */
OS_EXIT_CRITICAL();
return (OS_ERR_EVENT_TYPE);
}
dataptr->OSEventGrp = pevent->OSEventGrp; /* Copy message mailbox wait list *
-/
psrc = &pevent->OSEventTbl[0];
pdest = &dataptr->OSEventTbl[0];
for (i = 0; i < OS_EVENT_TBL_SIZE; i++) {
*pdest++ = *psrc++;
}
dataptr->OSMsg = pevent->OSEventPtr; /* Get message from mailbox *
-/
OS_EXIT_CRITICAL();
return (OS_NO_ERR);
}
#endif
#endif
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = ---- ----
CONSTANT SIZE = ---- ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = ---- ----
IDATA SIZE = ---- ----
C51 COMPILER V7.50 OS_MBOX 10/31/2005 15:29:41 PAGE 4
BIT SIZE = ---- ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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