999 lines
32 KiB
C
999 lines
32 KiB
C
/*************************************************************************\
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* Copyright (c) 2008 UChicago Argonne LLC, 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 is 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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/* $Id$
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*
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* Original Authors: Bob Dalesio and Marty Kraimer
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* Date: 26MAR96
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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 "epicsString.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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#include "epicsExit.h"
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#include "cantProceed.h"
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/* We can't include dbStaticLib.h here */
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#define dbCalloc(nobj,size) callocMustSucceed(nobj,size,"dbCalloc")
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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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#include "recSup.h"
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extern void dbServiceIOInit();
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static ELLLIST workList = ELLLIST_INIT; /* 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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#define removesOutstandingWarning 10000
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static enum {
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ctlRun, ctlPause, ctlExit
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} dbCaCtl;
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static epicsEventId startStopEvent;
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struct ca_client_context * dbCaClientContext;
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/* Forward declarations */
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static void dbCaTask(void *);
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#define printLinks(pcaLink) \
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errlogPrintf("%s has DB CA link to %s\n",\
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pcaLink->plink->value.pv_link.precord->name, pcaLink->pvname)
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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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* dbCaPutLinkCallback causes an additional complication because
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* when dbCaRemoveLink is called the callback may not have occured.
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* What is done is the following:
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* If callback has not occured dbCaRemoveLink sets plinkPutCallback=plink
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* If putCallback is called before dbCaTask calls ca_clear_channel
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* it does NOT call the users callback.
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* dbCaTask calls the users callback passing plinkPutCallback AFTER
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* it has called ca_clear_channel
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* Thus the users callback will get called exactly once.
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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;
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epicsMutexMustLock(workListLock);
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callAdd = (pca->link_action == 0);
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if (pca->link_action & CA_CLEAR_CHANNEL) {
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errlogPrintf("dbCa::addAction %d with CA_CLEAR_CHANNEL set\n",
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link_action);
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printLinks(pca);
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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::addAction pausing, %d channels to clear\n",
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removesOutstanding);
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printLinks(pca);
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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)
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ellAdd(&workList, &pca->node);
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epicsMutexUnlock(workListLock);
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if (callAdd)
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epicsEventSignal(workListEvent);
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}
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void dbCaCallbackProcess(void *usrPvt)
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{
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struct link *plink = (struct link *)usrPvt;
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dbCommon *pdbCommon = plink->value.pv_link.precord;
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dbScanLock(pdbCommon);
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pdbCommon->rset->process(pdbCommon);
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dbScanUnlock(pdbCommon);
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}
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static void dbCaShutdown(void *arg)
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{
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if (dbCaCtl == ctlRun) {
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dbCaCtl = ctlExit;
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epicsEventSignal(workListEvent);
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epicsEventMustWait(startStopEvent);
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}
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}
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void dbCaLinkInit(void)
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{
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dbServiceIOInit();
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workListLock = epicsMutexMustCreate();
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workListEvent = epicsEventMustCreate(epicsEventEmpty);
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startStopEvent = epicsEventMustCreate(epicsEventEmpty);
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dbCaCtl = ctlPause;
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epicsThreadCreate("dbCaLink", epicsThreadPriorityMedium,
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epicsThreadGetStackSize(epicsThreadStackBig),
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dbCaTask, NULL);
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epicsEventMustWait(startStopEvent);
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epicsAtExit(dbCaShutdown, NULL);
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}
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void dbCaRun(void)
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{
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dbCaCtl = ctlRun;
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epicsEventSignal(workListEvent);
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}
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void dbCaPause(void)
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{
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dbCaCtl = ctlPause;
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epicsEventSignal(workListEvent);
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}
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void dbCaAddLinkCallback(struct link *plink,
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dbCaCallback connect, dbCaCallback monitor, void *userPvt)
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{
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caLink *pca;
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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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pca->plink = plink;
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pca->pvname = epicsStrDup(plink->value.pv_link.pvname);
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pca->connect = connect;
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pca->monitor = monitor;
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pca->userPvt = userPvt;
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epicsMutexMustLock(pca->lock);
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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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}
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void dbCaRemoveLink(struct link *plink)
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{
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caLink *pca = (caLink *)plink->value.pv_link.pvt;
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if (!pca) return;
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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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if (pca->putCallback)
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pca->plinkPutCallback = plink;
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/* Unlock before addAction or 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 dbCaGetLink(struct link *plink,short dbrType, void *pdest,
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epicsEnum16 *pstat, epicsEnum16 *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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short link_action = 0;
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int newType;
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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;
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pca->stat = LINK_ALARM;
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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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long (*fConvert)(const void *from, void *to, struct dbAddr *paddr);
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/* Subscribe as 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;
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pca->stat = LINK_ALARM;
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status = -1;
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goto done;
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}
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if (nelements) *nelements = 1;
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fConvert = dbFastGetConvertRoutine[dbDBRoldToDBFnew[DBR_STRING]][dbrType];
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status = fConvert(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;
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pca->stat = LINK_ALARM;
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status = -1;
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goto done;
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}
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newType = dbDBRoldToDBFnew[pca->dbrType];
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if (!nelements || *nelements == 1) {
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long (*fConvert)(const void *from, void *to, struct dbAddr *paddr);
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fConvert = dbFastGetConvertRoutine[newType][dbrType];
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assert(pca->pgetNative);
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status = fConvert(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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long (*aConvert)(struct dbAddr *paddr, void *to, long nreq, long nto, long off);
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aConvert = dbGetConvertRoutine[newType][dbrType];
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assert(pca->pgetNative);
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if (ntoget > pca->nelements)
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ntoget = pca->nelements;
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*nelements = ntoget;
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memset((void *)&dbAddr, 0, sizeof(dbAddr));
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dbAddr.pfield = pca->pgetNative;
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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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aConvert(&dbAddr, pdest, ntoget, ntoget, 0);
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}
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done:
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if (pstat) *pstat = pca->stat;
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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 dbCaPutLinkCallback(struct link *plink,short dbrType,
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const void *pbuffer,long nRequest,dbCaCallback callback,void *userPvt)
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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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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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long (*fConvert)(const void *from, void *to, struct dbAddr *paddr);
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/* Send as DBR_STRING */
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if (!pca->pputString) {
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pca->pputString = dbCalloc(1, MAX_STRING_SIZE);
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plink->value.pv_link.pvlMask |= pvlOptOutString;
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}
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fConvert = dbFastPutConvertRoutine[dbrType][dbDBRoldToDBFnew[DBR_STRING]];
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status = fConvert(pbuffer, 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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int newType = dbDBRoldToDBFnew[pca->dbrType];
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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 (nRequest == 1){
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long (*fConvert)(const void *from, void *to, struct dbAddr *paddr);
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fConvert = dbFastPutConvertRoutine[dbrType][newType];
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status = fConvert(pbuffer, pca->pputNative, 0);
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} else {
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struct dbAddr dbAddr;
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long (*aConvert)(struct dbAddr *paddr, const void *from, long nreq, long nfrom, long off);
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aConvert = dbPutConvertRoutine[dbrType][newType];
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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 = aConvert(&dbAddr, pbuffer, nRequest, 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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if (callback) {
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pca->putType = CA_PUT_CALLBACK;
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pca->putCallback = callback;
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pca->putUserPvt = userPvt;
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} else {
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pca->putType = CA_PUT;
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pca->putCallback = 0;
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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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int dbCaIsLinkConnected(const struct link *plink)
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{
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caLink *pca;
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if (!plink || plink->type != CA_LINK) return FALSE;
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pca = (caLink *)plink->value.pv_link.pvt;
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if (!pca || !pca->chid) return FALSE;
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return pca->isConnected;
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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 dbCaGetNelements(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 dbCaGetAlarm(const struct link *plink,
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epicsEnum16 *pstat, epicsEnum16 *psevr)
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{
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caLink *pca;
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pcaGetCheck
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if (pstat) *pstat = pca->stat;
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if (psevr) *psevr = pca->sevr;
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epicsMutexUnlock(pca->lock);
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return 0;
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}
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long dbCaGetTimeStamp(const struct link *plink,
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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 dbCaGetLinkDBFtype(const struct link *plink)
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{
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caLink *pca;
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int 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 dbCaGetAttributes(const struct link *plink,
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dbCaCallback callback,void *userPvt)
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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->getAttributes = callback;
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pca->getAttributesPvt = userPvt;
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gotAttributes = pca->gotAttributes;
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epicsMutexUnlock(pca->lock);
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if (gotAttributes && callback) callback(userPvt);
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return 0;
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}
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long dbCaGetControlLimits(const struct link *plink,
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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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}
|
||
epicsMutexUnlock(pca->lock);
|
||
return gotAttributes ? 0 : -1;
|
||
}
|
||
|
||
long dbCaGetGraphicLimits(const struct link *plink,
|
||
double *low, double *high)
|
||
{
|
||
caLink *pca;
|
||
int gotAttributes;
|
||
|
||
pcaGetCheck
|
||
gotAttributes = pca->gotAttributes;
|
||
if (gotAttributes) {
|
||
*low = pca->displayLimits[0];
|
||
*high = pca->displayLimits[1];
|
||
}
|
||
epicsMutexUnlock(pca->lock);
|
||
return gotAttributes ? 0 : -1;
|
||
}
|
||
|
||
long dbCaGetAlarmLimits(const struct link *plink,
|
||
double *lolo, double *low, double *high, double *hihi)
|
||
{
|
||
caLink *pca;
|
||
int gotAttributes;
|
||
|
||
pcaGetCheck
|
||
gotAttributes = pca->gotAttributes;
|
||
if (gotAttributes) {
|
||
*lolo = pca->alarmLimits[0];
|
||
*low = pca->alarmLimits[1];
|
||
*high = pca->alarmLimits[2];
|
||
*hihi = pca->alarmLimits[3];
|
||
}
|
||
epicsMutexUnlock(pca->lock);
|
||
return gotAttributes ? 0 : -1;
|
||
}
|
||
|
||
long dbCaGetPrecision(const struct link *plink, short *precision)
|
||
{
|
||
caLink *pca;
|
||
int gotAttributes;
|
||
|
||
pcaGetCheck
|
||
gotAttributes = pca->gotAttributes;
|
||
if (gotAttributes) *precision = pca->precision;
|
||
epicsMutexUnlock(pca->lock);
|
||
return gotAttributes ? 0 : -1;
|
||
}
|
||
|
||
long dbCaGetUnits(const struct link *plink,
|
||
char *units, int unitsSize)
|
||
{
|
||
caLink *pca;
|
||
int gotAttributes;
|
||
|
||
pcaGetCheck
|
||
gotAttributes = pca->gotAttributes;
|
||
if (unitsSize > sizeof(pca->units)) unitsSize = sizeof(pca->units);
|
||
if (gotAttributes) strncpy(units, pca->units, unitsSize);
|
||
units[unitsSize-1] = 0;
|
||
epicsMutexUnlock(pca->lock);
|
||
return gotAttributes ? 0 : -1;
|
||
}
|
||
|
||
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);
|
||
if (!pca->isConnected) {
|
||
struct pv_link *ppv_link = &plink->value.pv_link;
|
||
dbCommon *precord = ppv_link->precord;
|
||
|
||
pca->nDisconnect++;
|
||
if (precord &&
|
||
((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)) {
|
||
/* BUG: We have no way to clear any old subscription with the
|
||
* originally chosen data type/size. That will continue
|
||
* to send us data and will result in an assert() fail.
|
||
*/
|
||
/* 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;
|
||
if (pca->dbrType != DBR_STRING) {
|
||
link_action |= CA_GET_ATTRIBUTES;
|
||
}
|
||
done:
|
||
if (link_action) addAction(pca, link_action);
|
||
epicsMutexUnlock(pca->lock);
|
||
}
|
||
|
||
static void eventCallback(struct event_handler_args arg)
|
||
{
|
||
caLink *pca = (caLink *)arg.usr;
|
||
DBLINK *plink;
|
||
size_t size;
|
||
dbCommon *precord = 0;
|
||
struct dbr_time_double *pdbr_time_double;
|
||
dbCaCallback monitor = 0;
|
||
void *userPvt = 0;
|
||
|
||
assert(pca);
|
||
epicsMutexMustLock(pca->lock);
|
||
plink = pca->plink;
|
||
if (!plink) goto done;
|
||
monitor = pca->monitor;
|
||
userPvt = pca->userPvt;
|
||
precord = 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 = pdbr_time_double->severity;
|
||
pca->stat = pdbr_time_double->status;
|
||
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);
|
||
if (monitor) monitor(userPvt);
|
||
}
|
||
|
||
static void exceptionCallback(struct exception_handler_args args)
|
||
{
|
||
const char *context = (args.ctx ? args.ctx : "unknown");
|
||
|
||
errlogPrintf("DB CA Link Exception: \"%s\", context \"%s\"\n",
|
||
ca_message(args.stat), context);
|
||
if (args.chid) {
|
||
errlogPrintf(
|
||
"DB CA Link Exception: channel \"%s\"\n",
|
||
ca_name(args.chid));
|
||
if (ca_state(args.chid) == cs_conn) {
|
||
errlogPrintf(
|
||
"DB CA Link Exception: native T=%s, request T=%s,"
|
||
" 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 putCallback(struct event_handler_args arg)
|
||
{
|
||
caLink *pca = (caLink *)arg.usr;
|
||
struct link *plink;
|
||
dbCaCallback callback = 0;
|
||
void *userPvt = 0;
|
||
|
||
epicsMutexMustLock(pca->lock);
|
||
plink = pca->plink;
|
||
if (!plink) goto done;
|
||
callback = pca->putCallback;
|
||
userPvt = pca->putUserPvt;
|
||
pca->putCallback = 0;
|
||
pca->putType = 0;
|
||
pca->putUserPvt = 0;
|
||
done:
|
||
epicsMutexUnlock(pca->lock);
|
||
if (callback) callback(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 &&
|
||
((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;
|
||
dbCaCallback connect = 0;
|
||
void *userPvt = 0;
|
||
dbCaCallback getAttributes = 0;
|
||
void *getAttributesPvt;
|
||
|
||
assert(pca);
|
||
epicsMutexMustLock(pca->lock);
|
||
plink = pca->plink;
|
||
if (!plink) {
|
||
epicsMutexUnlock(pca->lock);
|
||
return;
|
||
}
|
||
connect = pca->connect;
|
||
userPvt = pca->userPvt;
|
||
getAttributes = pca->getAttributes;
|
||
getAttributesPvt = pca->getAttributesPvt;
|
||
if (arg.status != ECA_NORMAL) {
|
||
dbCommon *precord = 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 (getAttributes) getAttributes(getAttributesPvt);
|
||
if (connect) connect(userPvt);
|
||
}
|
||
|
||
static void dbCaTask(void *arg)
|
||
{
|
||
int chan_count = 0;
|
||
|
||
taskwdInsert(0, 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");
|
||
epicsEventSignal(startStopEvent);
|
||
|
||
/* channel access event loop */
|
||
while (TRUE){
|
||
do {
|
||
epicsEventMustWait(workListEvent);
|
||
} while (dbCaCtl == ctlPause);
|
||
while (TRUE) { /* process all requests in workList*/
|
||
caLink *pca;
|
||
short link_action;
|
||
int status;
|
||
|
||
epicsMutexMustLock(workListLock);
|
||
if (!(pca = (caLink *)ellGet(&workList))){ /* Take off list head */
|
||
epicsMutexUnlock(workListLock);
|
||
if (dbCaCtl == ctlExit) goto shutdown;
|
||
break; /* workList is empty */
|
||
}
|
||
link_action = pca->link_action;
|
||
pca->link_action = 0;
|
||
if (link_action & CA_CLEAR_CHANNEL) --removesOutstanding;
|
||
epicsMutexUnlock(workListLock); /* Give back immediately */
|
||
if (link_action & CA_CLEAR_CHANNEL) { /* This must be first */
|
||
dbCaCallback callback;
|
||
struct link *plinkPutCallback = 0;
|
||
|
||
if (pca->chid) {
|
||
ca_clear_channel(pca->chid);
|
||
--chan_count;
|
||
}
|
||
callback = pca->putCallback;
|
||
if (callback) {
|
||
plinkPutCallback = pca->plinkPutCallback;
|
||
pca->plinkPutCallback = 0;
|
||
pca->putCallback = 0;
|
||
pca->putType = 0;
|
||
}
|
||
free(pca->pgetNative);
|
||
free(pca->pputNative);
|
||
free(pca->pgetString);
|
||
free(pca->pputString);
|
||
free(pca->pvname);
|
||
epicsMutexDestroy(pca->lock);
|
||
free(pca);
|
||
/* No alarm is raised. Since link is changing so what? */
|
||
if (callback) callback(plinkPutCallback);
|
||
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));
|
||
printLinks(pca);
|
||
continue;
|
||
}
|
||
chan_count++;
|
||
status = ca_replace_access_rights_event(pca->chid,
|
||
accessRightsCallback);
|
||
if (status != ECA_NORMAL) {
|
||
errlogPrintf("dbCaTask replace_access_rights_event %s\n",
|
||
ca_message(status));
|
||
printLinks(pca);
|
||
}
|
||
continue; /*Other options must wait until connect*/
|
||
}
|
||
if (ca_state(pca->chid) != cs_conn) continue;
|
||
if (link_action & CA_WRITE_NATIVE) {
|
||
assert(pca->pputNative);
|
||
if (pca->putType == CA_PUT) {
|
||
status = ca_array_put(
|
||
pca->dbrType, pca->nelements,
|
||
pca->chid, pca->pputNative);
|
||
} else if (pca->putType==CA_PUT_CALLBACK) {
|
||
status = ca_array_put_callback(
|
||
pca->dbrType, pca->nelements,
|
||
pca->chid, pca->pputNative,
|
||
putCallback, pca);
|
||
} else {
|
||
status = ECA_PUTFAIL;
|
||
}
|
||
if (status != ECA_NORMAL) {
|
||
errlogPrintf("dbCaTask ca_array_put %s\n",
|
||
ca_message(status));
|
||
printLinks(pca);
|
||
}
|
||
epicsMutexMustLock(pca->lock);
|
||
if (status == ECA_NORMAL) pca->newOutNative = FALSE;
|
||
epicsMutexUnlock(pca->lock);
|
||
}
|
||
if (link_action & CA_WRITE_STRING) {
|
||
assert(pca->pputString);
|
||
if (pca->putType == CA_PUT) {
|
||
status = ca_array_put(
|
||
DBR_STRING, 1,
|
||
pca->chid, pca->pputString);
|
||
} else if (pca->putType==CA_PUT_CALLBACK) {
|
||
status = ca_array_put_callback(
|
||
DBR_STRING, 1,
|
||
pca->chid, pca->pputString,
|
||
putCallback, pca);
|
||
} else {
|
||
status = ECA_PUTFAIL;
|
||
}
|
||
if (status != ECA_NORMAL) {
|
||
errlogPrintf("dbCaTask ca_array_put %s\n",
|
||
ca_message(status));
|
||
printLinks(pca);
|
||
}
|
||
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_get_callback %s\n",
|
||
ca_message(status));
|
||
printLinks(pca);
|
||
}
|
||
}
|
||
if (link_action & CA_MONITOR_NATIVE) {
|
||
size_t 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));
|
||
printLinks(pca);
|
||
}
|
||
}
|
||
if (link_action & CA_MONITOR_STRING) {
|
||
epicsMutexMustLock(pca->lock);
|
||
pca->pgetString = dbCalloc(1, MAX_STRING_SIZE);
|
||
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));
|
||
printLinks(pca);
|
||
}
|
||
}
|
||
}
|
||
SEVCHK(ca_flush_io(), "dbCaTask");
|
||
}
|
||
shutdown:
|
||
taskwdRemove(0);
|
||
if (chan_count == 0)
|
||
ca_context_destroy();
|
||
else
|
||
fprintf(stderr, "dbCa: chan_count = %d at shutdown\n", chan_count);
|
||
epicsEventSignal(startStopEvent);
|
||
}
|