os_q.src

uCOS-II_2.52在51上的移植程序

; .\OS_Q.SRC generated from: OS_Q.C
; COMPILER INVOKED BY:
;        C:\Keil\C51\BIN\C51.EXE OS_Q.C LARGE BROWSE ORDER NOAREGS DEBUG OBJECTEXTEND SRC(.\OS_Q.SRC)

$NOMOD51

NAME	OS_Q

P0	DATA	080H
P1	DATA	090H
P2	DATA	0A0H
P3	DATA	0B0H
PSW	DATA	0D0H
ACC	DATA	0E0H
B	DATA	0F0H
SP	DATA	081H
DPL	DATA	082H
DPH	DATA	083H
PCON	DATA	087H
TCON	DATA	088H
TMOD	DATA	089H
TL0	DATA	08AH
TL1	DATA	08BH
TH0	DATA	08CH
TH1	DATA	08DH
IE	DATA	0A8H
IP	DATA	0B8H
SCON	DATA	098H
SBUF	DATA	099H
CY	BIT	0D0H.7
AC	BIT	0D0H.6
F0	BIT	0D0H.5
RS1	BIT	0D0H.4
RS0	BIT	0D0H.3
OV	BIT	0D0H.2
P	BIT	0D0H.0
TF1	BIT	088H.7
TR1	BIT	088H.6
TF0	BIT	088H.5
TR0	BIT	088H.4
IE1	BIT	088H.3
IT1	BIT	088H.2
IE0	BIT	088H.1
IT0	BIT	088H.0
EA	BIT	0A8H.7
ES	BIT	0A8H.4
ET1	BIT	0A8H.3
EX1	BIT	0A8H.2
ET0	BIT	0A8H.1
EX0	BIT	0A8H.0
PS	BIT	0B8H.4
PT1	BIT	0B8H.3
PX1	BIT	0B8H.2
PT0	BIT	0B8H.1
PX0	BIT	0B8H.0
RD	BIT	0B0H.7
WR	BIT	0B0H.6
T1	BIT	0B0H.5
T0	BIT	0B0H.4
INT1	BIT	0B0H.3
INT0	BIT	0B0H.2
TXD	BIT	0B0H.1
RXD	BIT	0B0H.0
SM0	BIT	098H.7
SM1	BIT	098H.6
SM2	BIT	098H.5
REN	BIT	098H.4
TB8	BIT	098H.3
RB8	BIT	098H.2
TI	BIT	098H.1
RI	BIT	098H.0
; /*
; *********************************************************************************************************
; *                                                uC/OS-II
; *                                          The Real-Time Kernel
; *                                        MESSAGE QUEUE MANAGEMENT
; *
; *                          (c) Copyright 1992-2002, Jean J. Labrosse, Weston, FL
; *                                           All Rights Reserved
; *
; * File : OS_Q.C
; * By   : Jean J. Labrosse
; *********************************************************************************************************
; */
; 
; #ifndef  OS_MASTER_FILE
; #include "includes.h"
; #endif
; 
; #if (OS_Q_EN > 0) && (OS_MAX_QS > 0)
; /*
; *********************************************************************************************************
; *                                      ACCEPT MESSAGE FROM QUEUE
; *
; * Description: This function checks the queue to see if a message is available.  Unlike OSQPend(),
; *              OSQAccept() 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 queue if one is available.  The message is removed
; *                            from the so the next time OSQAccept() is called, the queue will contain
; *                            one less entry.
; *              == (void *)0  if the queue is empty or,
; *                            if 'pevent' is a NULL pointer or,
; *                            if you passed an invalid event type
; *********************************************************************************************************
; */
; 
; #if OS_Q_ACCEPT_EN > 0
; void  *OSQAccept (OS_EVENT *pevent)
; {
; 
;     void      *msg;
;     OS_Q      *pq;
; 
; 
; #if OS_ARG_CHK_EN > 0
;     if (pevent == (OS_EVENT *)0) {               /* Validate 'pevent'                                  */
;         return ((void *)0);
;     }
;     if (pevent->OSEventType != OS_EVENT_TYPE_Q) {/* Validate event block type                          */
;         return ((void *)0);
;     }
; #endif
;     OS_ENTER_CRITICAL();
;     pq = (OS_Q *)pevent->OSEventPtr;             /* Point at queue control block                       */
;     if (pq->OSQEntries > 0) {                    /* See if any messages in the queue                   */
;         msg = *pq->OSQOut++;                     /* Yes, extract oldest message from the queue         */
;         pq->OSQEntries--;                        /* Update the number of entries in the queue          */
;         if (pq->OSQOut == pq->OSQEnd) {          /* Wrap OUT pointer if we are at the end of the queue */
;             pq->OSQOut = pq->OSQStart;
;         }
;     } else {
;         msg = (void *)0;                         /* Queue is empty                                     */
;     }
;     OS_EXIT_CRITICAL();
;     return (msg);                                /* Return message received (or NULL)                  */
; }
; #endif
; /*$PAGE*/
; /*
; *********************************************************************************************************
; *                                        CREATE A MESSAGE QUEUE
; *
; * Description: This function creates a message queue if free event control blocks are available.
; *
; * Arguments  : start         is a pointer to the base address of the message queue storage area.  The
; *                            storage area MUST be declared as an array of pointers to 'void' as follows
; *
; *                            void *MessageStorage[size]
; *
; *              size          is the number of elements in the storage area
; *
; * Returns    : != (OS_EVENT *)0  is a pointer to the event control clock (OS_EVENT) associated with the
; *                                created queue
; *              == (OS_EVENT *)0  if no event control blocks were available or an error was detected
; *********************************************************************************************************
; */
; 
; OS_EVENT  *OSQCreate (void **start, INT16U size)
; {
; 
;     OS_EVENT  *pevent;
;     OS_Q      *pq;
; 
; 
;     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) {               /* See if we have an event control block              */
;         OS_ENTER_CRITICAL();
;         pq = OSQFreeList;                        /* Get a free queue control block                     */
;         if (pq != (OS_Q *)0) {                   /* Were we able to get a queue control block ?        */
;             OSQFreeList         = OSQFreeList->OSQPtr;    /* Yes, Adjust free list pointer to next free*/
;             OS_EXIT_CRITICAL();
;             pq->OSQStart        = start;                  /*      Initialize the queue                 */
;             pq->OSQEnd          = &start[size];
;             pq->OSQIn           = start;
;             pq->OSQOut          = start;
;             pq->OSQSize         = size;
;             pq->OSQEntries      = 0;
;             pevent->OSEventType = OS_EVENT_TYPE_Q;
;             pevent->OSEventCnt  = 0;
;             pevent->OSEventPtr  = pq;
;             OS_EventWaitListInit(pevent);                 /*      Initalize the wait list              */
;         } else {
;             pevent->OSEventPtr = (void *)OSEventFreeList; /* No,  Return event control block on error  */
;             OSEventFreeList    = pevent;
;             OS_EXIT_CRITICAL();
;             pevent = (OS_EVENT *)0;
;         }
;     }
;     return (pevent);
; }
; /*$PAGE*/
; /*
; *********************************************************************************************************
; *                                        DELETE A MESSAGE QUEUE
; *
; * Description: This function deletes a message queue and readies all tasks pending on the queue.
; *
; * Arguments  : pevent        is a pointer to the event control block associated with the desired
; *                            queue.
; *
; *              opt           determines delete options as follows:
; *                            opt == OS_DEL_NO_PEND   Delete the queue ONLY if no task pending
; *                            opt == OS_DEL_ALWAYS    Deletes the queue even if tasks are waiting.
; *                                                    In this case, all the tasks pending will be readied.
; *
; *              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 queue was deleted
; *                            OS_ERR_DEL_ISR          If you tried to delete the queue from an ISR
; *                            OS_ERR_INVALID_OPT      An invalid option was specified
; *                            OS_ERR_TASK_WAITING     One or more tasks were waiting on the queue
; *                            OS_ERR_EVENT_TYPE       If you didn't pass a pointer to a queue
; *                            OS_ERR_PEVENT_NULL      If 'pevent' is a NULL pointer.
; *
; * Returns    : pevent        upon error
; *              (OS_EVENT *)0 if the queue was successfully deleted.
; *
; * Note(s)    : 1) This function must be used with care.  Tasks that would normally expect the presence of
; *                 the queue MUST check the return code of OSQPend().
; *              2) OSQAccept() callers will not know that the intended queue 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 queue.
; *              4) Because ALL tasks pending on the queue will be readied, you MUST be careful in
; *                 applications where the queue is used for mutual exclusion because the resource(s)
; *                 will no longer be guarded by the queue.
; *              5) If the storage for the message queue was allocated dynamically (i.e. using a malloc()
; *                 type call) then your application MUST release the memory storage by call the counterpart
; *                 call of the dynamic allocation scheme used.  If the queue storage was created statically
; *                 then, the storage can be reused.
; *********************************************************************************************************
; */
; 
; #if OS_Q_DEL_EN > 0
; OS_EVENT  *OSQDel (OS_EVENT *pevent, INT8U opt, INT8U *err)
; {
; 
;     BOOLEAN    tasks_waiting;
;     OS_Q      *pq;
; 
; 
;     if (OSIntNesting > 0) {                                /* See if called from ISR ...               */
;         *err = OS_ERR_DEL_ISR;                             /* ... can't DELETE from an ISR             */
;         return ((OS_EVENT *)0);
;     }
; #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_Q) {          /* Validate event block type                */
;         *err = OS_ERR_EVENT_TYPE;