809 lines
26 KiB
C
809 lines
26 KiB
C
/*************************************************************************\
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* Copyright (c) 2002 The University of Chicago, as Operator of Argonne
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* National Laboratory.
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* Copyright (c) 2002 The Regents of the University of California, as
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* Operator of Los Alamos National Laboratory.
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* EPICS BASE Versions 3.13.7
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* and higher are distributed subject to a Software License Agreement found
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* in file LICENSE that is included with this distribution.
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\*************************************************************************/
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/* dbCa.c */
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/****************************************************************
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*
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* Current Author: Bob Dalesio
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* Contributing Author: Marty Kraimer
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* Date: 26MAR96
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*
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* Complete replacement for dbCaDblink.c dbCaLink.c (Nicholas T. Karonis)
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*
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****************************************************************/
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include "dbDefs.h"
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#include "epicsMutex.h"
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#include "epicsEvent.h"
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#include "epicsThread.h"
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#include "epicsTime.h"
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#include "errlog.h"
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#include "taskwd.h"
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#include "alarm.h"
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#include "link.h"
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#include "errMdef.h"
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#include "epicsPrint.h"
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#include "dbCommon.h"
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#include "cadef.h"
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#include "epicsAssert.h"
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/*following because we cant include dbStaticLib.h*/
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epicsShareFunc void * epicsShareAPI dbCalloc(size_t nobj,size_t size);
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#define epicsExportSharedSymbols
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#include "db_access_routines.h"
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#include "db_convert.h"
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#include "dbScan.h"
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#include "dbLock.h"
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#include "dbCa.h"
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#include "dbCaPvt.h"
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#define STATIC static
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STATIC ELLLIST workList; /* Work list for dbCaTask */
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STATIC epicsMutexId workListLock; /*Mutual exclusions semaphores for workList*/
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STATIC epicsEventId workListEvent; /*wakeup event for dbCaTask*/
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STATIC int removesOutstanding = 0;
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STATIC int removesOutstandingWarning = 10000;
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struct ca_client_context * dbCaClientContext;
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void dbCaTask(void); /*The Channel Access Task*/
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extern void dbServiceIOInit();
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/* caLink locking
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*
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* workListLock
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* This is only used to put request into and take them out of workList.
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* While this is locked no other locks are taken
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*
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* dbScanLock
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* dbCaAddLink and dbCaRemoveLink are only called by dbAccess or iocInit
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* They are only called by dbAccess when it has a global lock on lock set.
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* It is assumed that ALL other dbCaxxx calls are made only if dbScanLock
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* is already active. These routines are intended for use by record/device
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* support.
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*
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* caLink.lock
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* Any code that use a caLink takes this lock and releases it when done
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*
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* dbCaTask and the channel access callbacks NEVER access anything in the
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* records except after locking caLink.lock and checking that caLink.plink
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* is not null. They NEVER call dbScanLock.
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*
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* The above is necessary to prevent deadlocks and attempts to use a caLink
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* that has been deleted.
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*
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* Just a few words about handling dbCaRemoveLink because this is when
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* it is essential that nothing trys to use a caLink that has been freed.
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*
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* dbCaRemoveLink is called when links are being modified. This is only
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* done with the dbScan mechanism guranteeing that nothing from
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* database access trys to access the record containing the caLink.
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*
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* Thus the problem is to make sure that nothing from channel access
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* accesses a caLink that is deleted. This is done as follows.
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*
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* dbCaRemoveLink does the following:
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* epicsMutexMustLock(pca->lock);
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* pca->plink = 0;
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* plink->value.pv_link.pvt = 0;
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* epicsMutexUnlock(pca->lock);
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* addAction(pca,CA_CLEAR_CHANNEL);
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*
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* dbCaTask issues a ca_clear_channel and then frees the caLink.
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*
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* If any channel access callback gets called before the ca_clear_channel
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* it finds pca->plink=0 and does nothing. Once ca_clear_channel
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* is called no other callback for this caLink will be called.
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*
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*/
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STATIC void addAction(caLink *pca, short link_action)
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{
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int callAdd = FALSE;
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epicsMutexMustLock(workListLock);
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if(pca->link_action==0) callAdd = TRUE;
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if((pca->link_action&CA_CLEAR_CHANNEL)!=0) {
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errlogPrintf("dbCa:addAction %d but CA_CLEAR_CHANNEL already requested\n",
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link_action);
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callAdd = FALSE;
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link_action=0;
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}
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if(link_action&CA_CLEAR_CHANNEL) {
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if(++removesOutstanding>=removesOutstandingWarning) {
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errlogPrintf("dbCa: Warning removesOutstanding %d\n",removesOutstanding);
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}
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while(removesOutstanding>=removesOutstandingWarning) {
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epicsMutexUnlock(workListLock);
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epicsThreadSleep(1.0);
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epicsMutexMustLock(workListLock);
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}
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}
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pca->link_action |= link_action;
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if(callAdd) ellAdd(&workList,&pca->node);
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epicsMutexUnlock(workListLock); /*Give it back immediately*/
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if(callAdd) epicsEventSignal(workListEvent);
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}
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void epicsShareAPI dbCaLinkInit(void)
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{
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dbServiceIOInit();
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ellInit(&workList);
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workListLock = epicsMutexMustCreate();
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workListEvent = epicsEventMustCreate(epicsEventEmpty);
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epicsThreadCreate("dbCaLink", epicsThreadPriorityMedium,
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epicsThreadGetStackSize(epicsThreadStackBig),
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(EPICSTHREADFUNC) dbCaTask,0);
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}
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void epicsShareAPI dbCaAddLink( struct link *plink)
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{
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caLink *pca;
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char *pvname;
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assert(!plink->value.pv_link.pvt);
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pca = (caLink*)dbCalloc(1,sizeof(caLink));
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pca->lock = epicsMutexMustCreate();
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epicsMutexMustLock(pca->lock);
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pca->plink = plink;
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pvname = plink->value.pv_link.pvname;
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pca->pvname = dbCalloc(1,strlen(pvname) +1);
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strcpy(pca->pvname,pvname);
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plink->type = CA_LINK;
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plink->value.pv_link.pvt = pca;
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addAction(pca,CA_CONNECT);
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epicsMutexUnlock(pca->lock);
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return;
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}
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void epicsShareAPI dbCaRemoveLink( struct link *plink)
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{
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caLink *pca = (caLink *)plink->value.pv_link.pvt;
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assert(pca);
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epicsMutexMustLock(pca->lock);
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pca->plink = 0;
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plink->value.pv_link.pvt = 0;
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/*Must unlock before addAction. Otherwise dbCaTask might free first*/
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epicsMutexUnlock(pca->lock);
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addAction(pca,CA_CLEAR_CHANNEL);
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}
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long epicsShareAPI dbCaGetLink(struct link *plink,short dbrType, void *pdest,
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unsigned short *psevr,long *nelements)
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{
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caLink *pca = (caLink *)plink->value.pv_link.pvt;
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long status = 0;
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long (*pconvert)();
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short link_action = 0;
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assert(pca);
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epicsMutexMustLock(pca->lock);
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assert(pca->plink);
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if(!pca->isConnected || !pca->hasReadAccess) {
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pca->sevr = INVALID_ALARM; status = -1;
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goto done;
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}
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if((pca->dbrType == DBR_ENUM) && (dbDBRnewToDBRold[dbrType] == DBR_STRING)){
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/*Must ask server for DBR_STRING*/
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if(!pca->pgetString) {
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plink->value.pv_link.pvlMask |= pvlOptInpString;
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link_action |= CA_MONITOR_STRING;
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}
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if(!pca->gotInString) {
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pca->sevr = INVALID_ALARM; status = -1;
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goto done;
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}
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if(nelements) *nelements = 1;
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pconvert=dbFastGetConvertRoutine[dbDBRoldToDBFnew[DBR_STRING]][dbrType];
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status = (*(pconvert))(pca->pgetString, pdest, 0);
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goto done;
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}
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if(!pca->pgetNative) {
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plink->value.pv_link.pvlMask |= pvlOptInpNative;
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link_action |= CA_MONITOR_NATIVE;
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}
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if(!pca->gotInNative){
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pca->sevr = INVALID_ALARM; status = -1;
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goto done;
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}
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if(!nelements || *nelements == 1){
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pconvert= dbFastGetConvertRoutine[dbDBRoldToDBFnew[pca->dbrType]][dbrType];
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assert(pca->pgetNative);
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(*(pconvert))(pca->pgetNative, pdest, 0);
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} else {
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unsigned long ntoget = *nelements;
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struct dbAddr dbAddr;
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if(ntoget > pca->nelements) ntoget = pca->nelements;
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*nelements = ntoget;
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pconvert = dbGetConvertRoutine[dbDBRoldToDBFnew[pca->dbrType]][dbrType];
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memset((void *)&dbAddr,0,sizeof(dbAddr));
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dbAddr.pfield = pca->pgetNative;
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assert(dbAddr.pfield);
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/*Following will only be used for pca->dbrType == DBR_STRING*/
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dbAddr.field_size = MAX_STRING_SIZE;
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/*Ignore error return*/
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(*(pconvert))(&dbAddr,pdest,ntoget,ntoget,0);
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}
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done:
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if(psevr) *psevr = pca->sevr;
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if(link_action) addAction(pca,link_action);
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epicsMutexUnlock(pca->lock);
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return(status);
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}
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long epicsShareAPI dbCaPutLink(struct link *plink,short dbrType,
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const void *psource,long nelements)
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{
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caLink *pca = (caLink *)plink->value.pv_link.pvt;
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long (*pconvert)();
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long status = 0;
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short link_action = 0;
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assert(pca);
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/* put the new value in */
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epicsMutexMustLock(pca->lock);
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assert(pca->plink);
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if(!pca->isConnected || !pca->hasWriteAccess) {
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epicsMutexUnlock(pca->lock);
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return(-1);
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}
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if((pca->dbrType == DBR_ENUM) && (dbDBRnewToDBRold[dbrType] == DBR_STRING)){
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/*Must send DBR_STRING*/
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if(!pca->pputString) {
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pca->pputString = dbCalloc(MAX_STRING_SIZE,sizeof(char));
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plink->value.pv_link.pvlMask |= pvlOptOutString;
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}
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pconvert=dbFastPutConvertRoutine[dbrType][dbDBRoldToDBFnew[DBR_STRING]];
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status = (*(pconvert))(psource,pca->pputString, 0);
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link_action |= CA_WRITE_STRING;
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pca->gotOutString = TRUE;
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if(pca->newOutString) pca->nNoWrite++;
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pca->newOutString = TRUE;
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} else {
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if(!pca->pputNative) {
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pca->pputNative = dbCalloc(pca->nelements,
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dbr_value_size[ca_field_type(pca->chid)]);
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plink->value.pv_link.pvlMask |= pvlOptOutString;
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}
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if(nelements == 1){
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pconvert = dbFastPutConvertRoutine
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[dbrType][dbDBRoldToDBFnew[pca->dbrType]];
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status = (*(pconvert))(psource,pca->pputNative, 0);
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}else{
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struct dbAddr dbAddr;
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pconvert = dbPutConvertRoutine
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[dbrType][dbDBRoldToDBFnew[pca->dbrType]];
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memset((void *)&dbAddr,0,sizeof(dbAddr));
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dbAddr.pfield = pca->pputNative;
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/*Following only used for DBF_STRING*/
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dbAddr.field_size = MAX_STRING_SIZE;
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status = (*(pconvert))(&dbAddr,psource,nelements,pca->nelements,0);
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}
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link_action |= CA_WRITE_NATIVE;
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pca->gotOutNative = TRUE;
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if(pca->newOutNative) pca->nNoWrite++;
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pca->newOutNative = TRUE;
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}
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addAction(pca,link_action);
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epicsMutexUnlock(pca->lock);
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return(status);
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}
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#define pcaGetCheck \
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assert(plink); \
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if(plink->type!=CA_LINK) return(-1); \
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pca = (caLink *)plink->value.pv_link.pvt; \
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assert(pca); \
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epicsMutexMustLock(pca->lock); \
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assert(pca->plink); \
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if(!pca->isConnected) { \
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epicsMutexUnlock(pca->lock); \
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return(-1); \
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}
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long epicsShareAPI dbCaGetNelements(
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const struct link *plink,long *nelements)
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{
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caLink *pca;
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pcaGetCheck
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*nelements = pca->nelements;
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epicsMutexUnlock(pca->lock);
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return(0);
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}
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long epicsShareAPI dbCaGetSevr(
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const struct link *plink,short *severity)
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{
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caLink *pca;
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pcaGetCheck
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*severity = pca->sevr;
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epicsMutexUnlock(pca->lock);
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return(0);
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}
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long epicsShareAPI dbCaGetTimeStamp(
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const struct link *plink,epicsTimeStamp *pstamp)
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{
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caLink *pca;
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pcaGetCheck
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memcpy(pstamp,&pca->timeStamp,sizeof(epicsTimeStamp));
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epicsMutexUnlock(pca->lock);
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return(0);
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}
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int epicsShareAPI dbCaIsLinkConnected(
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const struct link *plink)
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{
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caLink *pca;
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if(!plink) return(FALSE);
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if(plink->type != CA_LINK) return(FALSE);
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pca = (caLink *)plink->value.pv_link.pvt;
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if(!pca) return(FALSE);
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if(!pca->chid) return(FALSE);
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if(pca->isConnected) return(TRUE);
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return(FALSE);
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}
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int epicsShareAPI dbCaGetLinkDBFtype(
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const struct link *plink)
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{
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caLink *pca;
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short type;
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pcaGetCheck
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type = dbDBRoldToDBFnew[pca->dbrType];
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epicsMutexUnlock(pca->lock);
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return(type);
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}
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long epicsShareAPI dbCaGetAttributes(const struct link *plink,
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void (*callback)(void *usrPvt),void *usrPvt)
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{
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caLink *pca;
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int gotAttributes;
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assert(plink);
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if(plink->type!=CA_LINK) return(-1);
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pca = (caLink *)plink->value.pv_link.pvt;
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assert(pca);
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epicsMutexMustLock(pca->lock);
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assert(pca->plink);
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pca->callback = callback;
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pca->userPvt = usrPvt;
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gotAttributes = pca->gotAttributes;
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epicsMutexUnlock(pca->lock);
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if(gotAttributes) (*pca->callback)(pca->userPvt);
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return(0);
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}
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long epicsShareAPI dbCaGetControlLimits(
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const struct link *plink,double *low, double *high)
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{
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caLink *pca;
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int gotAttributes;
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pcaGetCheck
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gotAttributes = pca->gotAttributes;
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if(gotAttributes) {
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*low = pca->controlLimits[0];
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*high = pca->controlLimits[1];
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}
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epicsMutexUnlock(pca->lock);
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return(gotAttributes ? 0 : -1);
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}
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long epicsShareAPI dbCaGetGraphicLimits(
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const struct link *plink,double *low, double *high)
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{
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caLink *pca;
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int gotAttributes;
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pcaGetCheck
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gotAttributes = pca->gotAttributes;
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if(gotAttributes) {
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*low = pca->displayLimits[0];
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*high = pca->displayLimits[1];
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}
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epicsMutexUnlock(pca->lock);
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return(gotAttributes ? 0 : -1);
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}
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long epicsShareAPI dbCaGetAlarmLimits(
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const struct link *plink,
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double *lolo, double *low, double *high, double *hihi)
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{
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caLink *pca;
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int gotAttributes;
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pcaGetCheck
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gotAttributes = pca->gotAttributes;
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if(gotAttributes) {
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*lolo = pca->alarmLimits[0];
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*low = pca->alarmLimits[1];
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*high = pca->alarmLimits[2];
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*hihi = pca->alarmLimits[3];
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}
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epicsMutexUnlock(pca->lock);
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return(gotAttributes ? 0 : -1);
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}
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long epicsShareAPI dbCaGetPrecision(
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const struct link *plink,short *precision)
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{
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caLink *pca;
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int gotAttributes;
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pcaGetCheck
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gotAttributes = pca->gotAttributes;
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if(gotAttributes) *precision = pca->precision;
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epicsMutexUnlock(pca->lock);
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return(gotAttributes ? 0 : -1);
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}
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long epicsShareAPI dbCaGetUnits(
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const struct link *plink,char *units,int unitsSize)
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{
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caLink *pca;
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int gotAttributes;
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pcaGetCheck
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gotAttributes = pca->gotAttributes;
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if(unitsSize>sizeof(pca->units)) unitsSize = sizeof(pca->units);
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if(gotAttributes) strncpy(units,pca->units,unitsSize);
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units[unitsSize-1] = 0;
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epicsMutexUnlock(pca->lock);
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return(gotAttributes ? 0 : -1);
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}
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STATIC void exceptionCallback(struct exception_handler_args args)
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{
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const char *context = (args.ctx ? args.ctx : "unknown");
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errlogPrintf("DB CA Exception: \"%s\", context \"%s\"\n",
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ca_message(args.stat), context);
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if (args.chid) {
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errlogPrintf(
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"DB CA Exception: channel \"%s\"\n",
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ca_name(args.chid));
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if (ca_state(args.chid)==cs_conn) {
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errlogPrintf(
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"DB CA Exception: native T=%s, request T=%s,"
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" native N=%ld, request N=%ld, "
|
||
" access rights {%s%s}\n",
|
||
dbr_type_to_text(ca_field_type(args.chid)),
|
||
dbr_type_to_text(args.type),
|
||
ca_element_count(args.chid),
|
||
args.count,
|
||
ca_read_access(args.chid) ? "R" : "",
|
||
ca_write_access(args.chid) ? "W" : "");
|
||
}
|
||
}
|
||
}
|
||
|
||
STATIC void eventCallback(struct event_handler_args arg)
|
||
{
|
||
caLink *pca = (caLink *)arg.usr;
|
||
DBLINK *plink;
|
||
long size;
|
||
dbCommon *precord = 0;
|
||
struct dbr_time_double *pdbr_time_double;
|
||
|
||
assert(pca);
|
||
epicsMutexMustLock(pca->lock);
|
||
plink = pca->plink;
|
||
if(!plink) goto done;
|
||
precord = (dbCommon *)plink->value.pv_link.precord;
|
||
if(arg.status != ECA_NORMAL) {
|
||
if(precord) {
|
||
if((arg.status!=ECA_NORDACCESS) && (arg.status!=ECA_GETFAIL))
|
||
errlogPrintf("dbCa: eventCallback record %s error %s\n",
|
||
precord->name,ca_message(arg.status));
|
||
} else {
|
||
errlogPrintf("dbCa: eventCallback error %s\n",
|
||
ca_message(arg.status));
|
||
}
|
||
goto done;
|
||
}
|
||
assert(arg.dbr);
|
||
size = arg.count * dbr_value_size[arg.type];
|
||
if((arg.type==DBR_TIME_STRING) && (ca_field_type(pca->chid)==DBR_ENUM)) {
|
||
assert(pca->pgetString);
|
||
memcpy(pca->pgetString,dbr_value_ptr(arg.dbr,arg.type),size);
|
||
pca->gotInString = TRUE;
|
||
} else switch (arg.type){
|
||
case DBR_TIME_STRING:
|
||
case DBR_TIME_SHORT:
|
||
case DBR_TIME_FLOAT:
|
||
case DBR_TIME_ENUM:
|
||
case DBR_TIME_CHAR:
|
||
case DBR_TIME_LONG:
|
||
case DBR_TIME_DOUBLE:
|
||
assert(pca->pgetNative);
|
||
memcpy(pca->pgetNative,dbr_value_ptr(arg.dbr,arg.type),size);
|
||
pca->gotInNative = TRUE;
|
||
break;
|
||
default:
|
||
errMessage(-1,"dbCa: eventCallback Logic Error\n");
|
||
break;
|
||
}
|
||
pdbr_time_double = (struct dbr_time_double *)arg.dbr;
|
||
pca->sevr = (unsigned short)pdbr_time_double->severity;
|
||
memcpy(&pca->timeStamp,&pdbr_time_double->stamp,sizeof(epicsTimeStamp));
|
||
if(precord) {
|
||
struct pv_link *ppv_link = &(plink->value.pv_link);
|
||
|
||
if((ppv_link->pvlMask&pvlOptCP)
|
||
|| ((ppv_link->pvlMask&pvlOptCPP)&&(precord->scan==0)))
|
||
scanOnce(precord);
|
||
}
|
||
done:
|
||
epicsMutexUnlock(pca->lock);
|
||
}
|
||
|
||
STATIC void getAttribEventCallback(struct event_handler_args arg)
|
||
{
|
||
caLink *pca = (caLink *)arg.usr;
|
||
struct link *plink;
|
||
struct dbr_ctrl_double *pdbr;
|
||
|
||
assert(pca);
|
||
epicsMutexMustLock(pca->lock);
|
||
plink = pca->plink;
|
||
if(!plink) {
|
||
epicsMutexUnlock(pca->lock);
|
||
return;
|
||
}
|
||
if(arg.status != ECA_NORMAL) {
|
||
dbCommon *precord = (dbCommon *)plink->value.pv_link.precord;
|
||
if(precord) {
|
||
errlogPrintf("dbCa: getAttribEventCallback record %s error %s\n",
|
||
precord->name,ca_message(arg.status));
|
||
} else {
|
||
errlogPrintf("dbCa: getAttribEventCallback error %s\n",
|
||
ca_message(arg.status));
|
||
}
|
||
epicsMutexUnlock(pca->lock);
|
||
return;
|
||
}
|
||
assert(arg.dbr);
|
||
pdbr = (struct dbr_ctrl_double *)arg.dbr;
|
||
pca->gotAttributes = TRUE;
|
||
pca->controlLimits[0] = pdbr->lower_ctrl_limit;
|
||
pca->controlLimits[1] = pdbr->upper_ctrl_limit;
|
||
pca->displayLimits[0] = pdbr->lower_disp_limit;
|
||
pca->displayLimits[1] = pdbr->upper_disp_limit;
|
||
pca->alarmLimits[0] = pdbr->lower_alarm_limit;
|
||
pca->alarmLimits[1] = pdbr->lower_warning_limit;
|
||
pca->alarmLimits[2] = pdbr->upper_warning_limit;
|
||
pca->alarmLimits[3] = pdbr->upper_alarm_limit;
|
||
pca->precision = pdbr->precision;
|
||
memcpy(pca->units,pdbr->units,MAX_UNITS_SIZE);
|
||
epicsMutexUnlock(pca->lock);
|
||
if(pca->callback) (*pca->callback)(pca->userPvt);
|
||
}
|
||
|
||
STATIC void accessRightsCallback(struct access_rights_handler_args arg)
|
||
{
|
||
caLink *pca = (caLink *)ca_puser(arg.chid);
|
||
struct link *plink;
|
||
struct pv_link *ppv_link;
|
||
dbCommon *precord;
|
||
|
||
assert(pca);
|
||
if(ca_state(pca->chid) != cs_conn) return;/*connectionCallback will handle*/
|
||
epicsMutexMustLock(pca->lock);
|
||
plink = pca->plink;
|
||
if(!plink) goto done;
|
||
pca->hasReadAccess = ca_read_access(arg.chid);
|
||
pca->hasWriteAccess = ca_write_access(arg.chid);
|
||
if(pca->hasReadAccess && pca->hasWriteAccess) goto done;
|
||
ppv_link = &(plink->value.pv_link);
|
||
precord = ppv_link->precord;
|
||
if(precord) {
|
||
if((ppv_link->pvlMask&pvlOptCP)
|
||
|| ((ppv_link->pvlMask&pvlOptCPP)&&(precord->scan==0)))
|
||
scanOnce(precord);
|
||
}
|
||
done:
|
||
epicsMutexUnlock(pca->lock);
|
||
}
|
||
|
||
STATIC void connectionCallback(struct connection_handler_args arg)
|
||
{
|
||
caLink *pca;
|
||
short link_action = 0;
|
||
struct link *plink;
|
||
|
||
pca = ca_puser(arg.chid);
|
||
assert(pca);
|
||
epicsMutexMustLock(pca->lock);
|
||
plink = pca->plink;
|
||
if(!plink) goto done;
|
||
pca->isConnected = (ca_state(arg.chid)==cs_conn) ? TRUE : FALSE ;
|
||
if(!pca->isConnected) {
|
||
struct pv_link *ppv_link = &(plink->value.pv_link);
|
||
dbCommon *precord = ppv_link->precord;
|
||
|
||
pca->nDisconnect++;
|
||
if(precord) {
|
||
if((ppv_link->pvlMask&pvlOptCP)
|
||
|| ((ppv_link->pvlMask&pvlOptCPP)&&(precord->scan==0)))
|
||
scanOnce(precord);
|
||
}
|
||
goto done;
|
||
}
|
||
pca->hasReadAccess = ca_read_access(arg.chid);
|
||
pca->hasWriteAccess = ca_write_access(arg.chid);
|
||
if(pca->gotFirstConnection) {
|
||
if((pca->nelements != ca_element_count(arg.chid))
|
||
|| (pca->dbrType != ca_field_type(arg.chid))){
|
||
/* field type or nelements changed */
|
||
/* Let next dbCaGetLink and/or dbCaPutLink determine options*/
|
||
plink->value.pv_link.pvlMask &=
|
||
~(pvlOptInpNative|pvlOptInpString|pvlOptOutNative|pvlOptOutString);
|
||
|
||
pca->gotInNative = 0;
|
||
pca->gotOutNative=0;
|
||
pca->gotInString=0;
|
||
pca->gotOutString=0;
|
||
free(pca->pgetNative); pca->pgetNative = 0;
|
||
free(pca->pgetString); pca->pgetString = 0;
|
||
free(pca->pputNative); pca->pputNative = 0;
|
||
free(pca->pputString); pca->pputString = 0;
|
||
}
|
||
}
|
||
pca->gotFirstConnection = TRUE;
|
||
pca->nelements = ca_element_count(arg.chid);
|
||
pca->dbrType = ca_field_type(arg.chid);
|
||
if((plink->value.pv_link.pvlMask & pvlOptInpNative) && (!pca->pgetNative)){
|
||
link_action |= CA_MONITOR_NATIVE;
|
||
}
|
||
if((plink->value.pv_link.pvlMask & pvlOptInpString) && (!pca->pgetString)){
|
||
link_action |= CA_MONITOR_STRING;
|
||
}
|
||
if((plink->value.pv_link.pvlMask & pvlOptOutNative) && (pca->gotOutNative)){
|
||
link_action |= CA_WRITE_NATIVE;
|
||
}
|
||
if((plink->value.pv_link.pvlMask & pvlOptOutString) && (pca->gotOutString)){
|
||
link_action |= CA_WRITE_STRING;
|
||
}
|
||
pca->gotAttributes = 0;
|
||
link_action |= CA_GET_ATTRIBUTES;
|
||
done:
|
||
if(link_action) addAction(pca,link_action);
|
||
epicsMutexUnlock(pca->lock);
|
||
}
|
||
|
||
void dbCaTask()
|
||
{
|
||
caLink *pca;
|
||
short link_action;
|
||
int status;
|
||
|
||
taskwdInsert(epicsThreadGetIdSelf(),NULL,NULL);
|
||
SEVCHK(ca_context_create(ca_enable_preemptive_callback),
|
||
"dbCaTask calling ca_context_create");
|
||
dbCaClientContext = ca_current_context ();
|
||
SEVCHK(ca_add_exception_event(exceptionCallback,NULL),
|
||
"ca_add_exception_event");
|
||
/*Dont do anything until iocInit initializes database*/
|
||
while(!interruptAccept) epicsThreadSleep(.1);
|
||
/* channel access event loop */
|
||
while (TRUE){
|
||
epicsEventMustWait(workListEvent);
|
||
while(TRUE) { /* process all requests in workList*/
|
||
epicsMutexMustLock(workListLock);
|
||
if(!(pca = (caLink *)ellFirst(&workList))){/*Take off list head*/
|
||
epicsMutexUnlock(workListLock);
|
||
break; /*workList is empty*/
|
||
}
|
||
ellDelete(&workList,&pca->node);
|
||
link_action = pca->link_action;
|
||
pca->link_action = 0;
|
||
if(link_action&CA_CLEAR_CHANNEL) --removesOutstanding;
|
||
epicsMutexUnlock(workListLock); /*Give it back immediately*/
|
||
if(link_action&CA_CLEAR_CHANNEL) {/*This must be first*/
|
||
if(pca->chid) ca_clear_channel(pca->chid);
|
||
free(pca->pgetNative);
|
||
free(pca->pputNative);
|
||
free(pca->pgetString);
|
||
free(pca->pputString);
|
||
free(pca->pvname);
|
||
epicsMutexDestroy(pca->lock);
|
||
free(pca);
|
||
continue; /*No other link_action makes sense*/
|
||
}
|
||
if(link_action&CA_CONNECT) {
|
||
status = ca_create_channel(
|
||
pca->pvname,connectionCallback,(void *)pca,
|
||
CA_PRIORITY_DB_LINKS, &(pca->chid));
|
||
if(status!=ECA_NORMAL) {
|
||
errlogPrintf("dbCaTask ca_create_channel %s\n",
|
||
ca_message(status));
|
||
continue;
|
||
}
|
||
status = ca_replace_access_rights_event(pca->chid,
|
||
accessRightsCallback);
|
||
if(status!=ECA_NORMAL)
|
||
errlogPrintf("dbCaTask replace_access_rights_event %s\n",
|
||
ca_message(status));
|
||
continue; /*Other options must wait until connect*/
|
||
}
|
||
if(ca_state(pca->chid) != cs_conn) continue;
|
||
if(link_action&CA_WRITE_NATIVE) {
|
||
assert(pca->pputNative);
|
||
status = ca_array_put(
|
||
pca->dbrType,pca->nelements,
|
||
pca->chid,pca->pputNative);
|
||
epicsMutexMustLock(pca->lock);
|
||
if(status==ECA_NORMAL) pca->newOutNative = FALSE;
|
||
epicsMutexUnlock(pca->lock);
|
||
}
|
||
if(link_action&CA_WRITE_STRING) {
|
||
assert(pca->pputString);
|
||
status = ca_array_put(
|
||
DBR_STRING,1,
|
||
pca->chid,pca->pputString);
|
||
epicsMutexMustLock(pca->lock);
|
||
if(status==ECA_NORMAL) pca->newOutString = FALSE;
|
||
epicsMutexUnlock(pca->lock);
|
||
}
|
||
/*CA_GET_ATTRIBUTES before CA_MONITOR so that attributes available
|
||
* before the first monitor callback */
|
||
if(link_action&CA_GET_ATTRIBUTES) {
|
||
status = ca_get_callback(DBR_CTRL_DOUBLE,
|
||
pca->chid,getAttribEventCallback,pca);
|
||
if(status!=ECA_NORMAL)
|
||
errlogPrintf("dbCaTask ca_add_array_event %s\n",
|
||
ca_message(status));
|
||
}
|
||
if(link_action&CA_MONITOR_NATIVE) {
|
||
short element_size;
|
||
|
||
element_size = dbr_value_size[ca_field_type(pca->chid)];
|
||
epicsMutexMustLock(pca->lock);
|
||
pca->pgetNative = dbCalloc(pca->nelements,element_size);
|
||
epicsMutexUnlock(pca->lock);
|
||
status = ca_add_array_event(
|
||
ca_field_type(pca->chid)+DBR_TIME_STRING,
|
||
ca_element_count(pca->chid),
|
||
pca->chid, eventCallback,pca,0.0,0.0,0.0,0);
|
||
if(status!=ECA_NORMAL)
|
||
errlogPrintf("dbCaTask ca_add_array_event %s\n",
|
||
ca_message(status));
|
||
}
|
||
if(link_action&CA_MONITOR_STRING) {
|
||
epicsMutexMustLock(pca->lock);
|
||
pca->pgetString = dbCalloc(MAX_STRING_SIZE,sizeof(char));
|
||
epicsMutexUnlock(pca->lock);
|
||
status = ca_add_array_event(DBR_TIME_STRING,1,
|
||
pca->chid, eventCallback,pca,0.0,0.0,0.0,
|
||
0);
|
||
if(status!=ECA_NORMAL)
|
||
errlogPrintf("dbCaTask ca_add_array_event %s\n",
|
||
ca_message(status));
|
||
}
|
||
}
|
||
SEVCHK(ca_flush_io(),"dbCaTask");
|
||
}
|
||
}
|