681 lines
18 KiB
C
681 lines
18 KiB
C
/* dbScan.c */
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/* share/src/db $Id$ */
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/* tasks and subroutines to scan the database */
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/*
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* Original Author: Bob Dalesio
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* Current Author: Marty Kraimer
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* Date: 07/18/91
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*
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* Experimental Physics and Industrial Control System (EPICS)
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*
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* Copyright 1991, the Regents of the University of California,
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* and the University of Chicago Board of Governors.
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*
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* This software was produced under U.S. Government contracts:
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* (W-7405-ENG-36) at the Los Alamos National Laboratory,
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* and (W-31-109-ENG-38) at Argonne National Laboratory.
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*
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* Initial development by:
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* The Controls and Automation Group (AT-8)
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* Ground Test Accelerator
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* Accelerator Technology Division
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* Los Alamos National Laboratory
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*
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* Co-developed with
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* The Controls and Computing Group
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* Accelerator Systems Division
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* Advanced Photon Source
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* Argonne National Laboratory
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*
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* Modification Log:
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* -----------------
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* .18 07-18-91 mrk major revision
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* .19 02-05-92 jba Changed function arguments from paddr to precord
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*/
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#include <vxWorks.h>
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#include <stdlib.h>
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#include <types.h>
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#include <semLib.h>
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#include <rngLib.h>
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#include <lstLib.h>
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#include <string.h>
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#include <dbDefs.h>
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#include <dbAccess.h>
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#include <dbScan.h>
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#include <taskwd.h>
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#include <callback.h>
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#include <dbCommon.h>
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#include <dbRecords.h>
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#include <devSup.h>
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#include <task_params.h>
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#include <fast_lock.h>
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extern volatile int interruptAccept;
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struct scan_list{
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FAST_LOCK lock;
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LIST list;
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short modified;/*has list been modified?*/
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long ticks; /*ticks per period for periodic*/
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};
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/*scan_elements are allocated and the address stored in dbCommon.spvt*/
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struct scan_element{
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NODE node;
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struct scan_list *pscan_list;
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struct dbCommon *precord;
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};
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int volatile scanRestart=FALSE;
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/* PERIODIC SCANNER */
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static int nPeriodic=0;
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static struct scan_list **papPeriodic; /* pointer to array of pointers*/
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static int *periodicTaskId; /*array of integers after allocation*/
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/* EVENT */
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#define MAX_EVENTS 256
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#define EVENT_QUEUE_SIZE 1000
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static struct scan_list *papEvent[MAX_EVENTS];/*array of pointers*/
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static SEM_ID eventSem;
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static RING_ID eventQ;
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static int eventTaskId;
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/* IO_EVENT*/
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struct io_scan_list {
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CALLBACK callback;
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struct scan_list scan_list;
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struct io_scan_list *next;
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};
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static struct io_scan_list *iosl_head[NUM_CALLBACK_PRIORITIES]={NULL,NULL,NULL};
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/* Private routines */
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void periodicTask(); /*Periodic scan task */
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void initPeriodic(); /*Initialize the periodic variables */
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void spawnPeriodic(); /*Spawn the periodTasks */
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void wdPeriodic(); /*watchdog callback for periodicTasks */
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void eventTask(); /*Periodic scan task */
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void initEvent(); /*Initialize the event variables */
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void spawnEvent(); /*Spawn the eventTask */
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void wdEvent(); /*watchdog callback for eventTask */
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void ioeventCallback(); /*ioevent callback */
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void printList(); /*print a scan list */
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void scanList(); /*Scan a scan list */
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void buildScanLists(); /*Build scan lists */
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void addToList(); /*add element to a list */
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void deleteFromList(); /*delete element from a list */
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long scanInit()
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{
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int i;
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initPeriodic();
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initEvent();
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scan_init(); /*old IO_EVENT_SCAN*/
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buildScanLists();
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for (i=0;i<nPeriodic; i++) spawnPeriodic(i);
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spawnEvent();
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return(0);
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}
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void post_event(int event)
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{
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unsigned char evnt;
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int status;
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if (!interruptAccept) return; /* not awake yet */
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if(event<0 || event>=MAX_EVENTS) {
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logMsg("illegal event passed to post_event\n");
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return;
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}
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evnt = (unsigned)event;
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/*multiple writers can exist. Thus if evnt is ever changed to use*/
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/*something bigger than a character interrupts will have to be blocked*/
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if(rngBufPut(eventQ,(void *)&evnt,sizeof(unsigned char))!=sizeof(unsigned char))
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logMsg("rngBufPut overflow in post_event\n");
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if((status=semGive(eventSem))!=OK){
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/*semGive randomly returns garbage value*/
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/*
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logMsg("semGive returned error in post_event status= %d\n",status);
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*/
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}
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}
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void scanAdd(struct dbCommon *precord)
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{
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short scan;
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short phase;
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short event;
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long status;
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struct scan_list *psl;
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/* get the list on which this record belongs */
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scan = precord->scan;
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if(scan==SCAN_PASSIVE) return;
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if(scan<0 || scan>= nPeriodic+SCAN_1ST_PERIODIC) {
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recGblRecordError(-1,precord,"scanAdd detected illegal SCAN value");
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}else if(scan==SCAN_EVENT) {
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unsigned char evnt;
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if(precord->evnt<0 || precord->evnt>=MAX_EVENTS) {
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recGblRecordError(S_db_badField,precord,"scanAdd detected illegal EVNT value");
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return;
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}
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evnt = (signed)precord->evnt;
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psl = papEvent[evnt];
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if(psl==NULL) {
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psl = calloc(1,sizeof(struct scan_list));
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papEvent[precord->evnt] = psl;
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FASTLOCKINIT(&psl->lock);
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lstInit(&psl->list);
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}
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addToList(precord,psl);
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} else if(scan==SCAN_IO_EVENT) {
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short cmd=0;
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struct io_scan_list *piosl;
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int priority,dummy1,dummy2;
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DEVSUPFUN get_ioint_info=precord->dset->get_ioint_info;
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if(get_ioint_info==NULL) return;
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if(get_ioint_info(&cmd,precord,&piosl,&dummy1,&dummy2)) return;/*return if error*/
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if(cmd==-1) {
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add_to_scan_list(precord); /*old IO_EVENT_SCAN*/
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} else {
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if(piosl==NULL) return;
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priority = precord->prio;
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if(priority<0 || priority>=NUM_CALLBACK_PRIORITIES) {
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recGblRecordError(-1,precord,"scanAdd: illegal prio field");
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return;
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}
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piosl += priority; /* get piosl for correct priority*/
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addToList(precord,&piosl->scan_list);
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}
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} else if(scan>=SCAN_1ST_PERIODIC) {
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int ind;
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ind = scan - SCAN_1ST_PERIODIC;
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psl = papPeriodic[ind];
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addToList(precord,psl);
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}
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return;
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}
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void scanDelete(struct dbCommon *precord)
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{
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short scan;
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short phase;
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short event;
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long status;
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struct scan_list *psl;
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/* get the list on which this record belongs */
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scan = precord->scan;
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if(scan==SCAN_PASSIVE) return;
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if(scan<0 || scan>= nPeriodic+SCAN_1ST_PERIODIC) {
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recGblRecordError(-1,precord,"scanDelete detected illegal SCAN value");
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}else if(scan==SCAN_EVENT) {
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unsigned char evnt;
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if(precord->evnt<0 || precord->evnt>=MAX_EVENTS) {
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recGblRecordError(S_db_badField,precord,"scanDelete detected illegal EVNT value");
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return;
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}
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evnt = (signed)precord->evnt;
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psl = papEvent[evnt];
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if(psl==NULL)
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recGblRecordError(-1,precord,"scanDelete for bad evnt");
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else
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deleteFromList(precord,psl);
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} else if(scan==SCAN_IO_EVENT) {
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short cmd=1;
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struct io_scan_list *piosl;
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int priority,dummy1,dummy2;
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DEVSUPFUN get_ioint_info=precord->dset->get_ioint_info;
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if(get_ioint_info==NULL) return;
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if(get_ioint_info(&cmd,precord,&piosl,&dummy1,&dummy2)) return;/*return if error*/
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if(cmd==-1) {
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delete_from_scan_list(precord); /*old IO_EVENT_SCAN*/
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} else {
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priority = precord->prio;
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if(priority<0 || priority>=NUM_CALLBACK_PRIORITIES) {
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recGblRecordError(-1,precord,"scanDelete: get_ioint_info returned illegal priority");
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return;
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}
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piosl += priority; /*get piosl for correct priority*/
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deleteFromList(precord,&piosl->scan_list);
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}
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} else if(scan>=SCAN_1ST_PERIODIC) {
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int ind;
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ind = scan - SCAN_1ST_PERIODIC;
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psl = papPeriodic[ind];
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deleteFromList(precord,psl);
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}
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return;
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}
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int scanppl() /*print periodic list*/
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{
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struct scan_list *psl;
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char message[80];
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double period;
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int i;
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for (i=0; i<nPeriodic; i++) {
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psl = papPeriodic[i];
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if(psl==NULL) continue;
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period = psl->ticks;
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period /= vxTicksPerSecond;
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sprintf(message,"Scan Period= %f seconds\n",period);
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printList(psl,message);
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}
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return(0);
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}
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int scanpel() /*print event list */
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{
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struct scan_list *psl;
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char message[80];
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int i;
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for (i=0; i<MAX_EVENTS; i++) {
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psl = papEvent[i];
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if(psl==NULL) continue;
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sprintf(message,"Event %d\n",i);
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printList(psl,message);
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}
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return(0);
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}
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int scanpiol() /* print io_event list */
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{
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struct io_scan_list *piosl;
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int priority;
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char message[80];
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for(priority=0; priority<NUM_CALLBACK_PRIORITIES; priority++) {
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piosl=iosl_head[priority];
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if(piosl==NULL)continue;
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sprintf(message,"IO Event: Priority=%d",priority);
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while(piosl != NULL) {
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printList(&piosl->scan_list,message);
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piosl=piosl->next;
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}
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}
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return(0);
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}
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void scanIoInit(IOSCANPVT *ppioscanpvt)
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{
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struct io_scan_list *piosl;
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int priority;
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/* allocate an array of io_scan_lists. One for each priority */
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/* IOSCANPVT will hold the address of this array of structures */
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*ppioscanpvt=calloc(NUM_CALLBACK_PRIORITIES,sizeof(struct io_scan_list));
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for(priority=0, piosl=*ppioscanpvt;
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priority<NUM_CALLBACK_PRIORITIES; priority++, piosl++){
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piosl->callback.callback = ioeventCallback;
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piosl->callback.priority = priority;
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lstInit(&piosl->scan_list.list);
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FASTLOCKINIT(&piosl->scan_list.lock);
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piosl->next=iosl_head[priority];
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iosl_head[priority]=piosl;
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}
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}
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void scanIoRequest(IOSCANPVT pioscanpvt)
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{
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struct io_scan_list *piosl;
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int priority;
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if(!interruptAccept) return;
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for(priority=0, piosl=pioscanpvt;
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priority<NUM_CALLBACK_PRIORITIES; priority++, piosl++){
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if(lstCount(&piosl->scan_list.list)>0) callbackRequest((void *)piosl);
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}
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}
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static void periodicTask(struct scan_list *psl)
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{
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unsigned long start_time,end_time;
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long delay;
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struct scan_element *pse,*prev,*next;
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start_time = tickGet();
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while(TRUE) {
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if(interruptAccept)scanList(psl);
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end_time = tickGet();
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delay = psl->ticks - (end_time - start_time);
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if(delay<=0) delay=1;
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taskDelay(delay);
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start_time = end_time + delay;
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}
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}
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static void initPeriodic()
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{
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struct {
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DBRenumStrs
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} scanChoices;
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struct scan_list *psl;
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struct dbAddr dbAddr; /* database address */
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struct recLoc *precLoc;
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struct dbCommon *precord=NULL; /* pointer to record */
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long status,nRequest,options;
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void *pfl=NULL;
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int i,j;
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char name[PVNAME_SZ+FLDNAME_SZ+2];
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float temp;
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if(dbRecords==NULL) {
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errMessage(S_record_noRecords, "initPeriodic");
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exit(1);
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}
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/* look for first record */
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for (i=0; i<dbRecords->number; i++) {
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if((precLoc=dbRecords->papRecLoc[i])==NULL) continue;
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for(j=0, precord=(struct dbCommon*)(precLoc->pFirst);
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j<precLoc->no_records;
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j++, ((char *)precord) += precLoc->rec_size) {
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if(precord->name[0]!=0) goto got_record;
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}
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}
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errMessage(S_record_noRecords,"initPeriodic");
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exit(1);
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got_record:
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/* get database address of SCAN field */
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name[PVNAME_SZ+1] = 0;
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strncpy(name,precord->name,PVNAME_SZ);
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strcat(name,".SCAN");
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if ((status=dbNameToAddr(name,&dbAddr)) != 0){
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recGblDbaddrError(status,&dbAddr,"initPeriodic");
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exit(1);
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}
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options = DBR_ENUM_STRS;
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nRequest = 0;
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status = dbGetField(&dbAddr,DBR_ENUM,&scanChoices,&options,&nRequest,pfl);
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if(status) {
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recGblDbaddrError(status,&dbAddr,"initPeriodic");
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exit(1);
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}
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nPeriodic = scanChoices.no_str - SCAN_1ST_PERIODIC;
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papPeriodic = calloc(nPeriodic,sizeof(struct scan_list *));
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if(papPeriodic==NULL) {
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errMessage(-1,"initPeriodic calloc failure");
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exit(1);
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}
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periodicTaskId = calloc(nPeriodic,sizeof(int));
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if(periodicTaskId==NULL) {
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errMessage(-1,"initPeriodic calloc failure");
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exit(1);
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}
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for(i=0; i<nPeriodic; i++) {
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psl = calloc(1,sizeof(struct scan_list));
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if(psl==NULL) {
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errMessage(-1,"initPeriodic calloc failure");
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exit(1);
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}
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papPeriodic[i] = psl;
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FASTLOCKINIT(&psl->lock);
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lstInit(&psl->list);
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sscanf(scanChoices.strs[i+SCAN_1ST_PERIODIC],"%f",&temp);
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psl->ticks = temp * vxTicksPerSecond;
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}
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}
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static void spawnPeriodic(int ind)
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{
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struct scan_list *psl;
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psl = papPeriodic[ind];
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periodicTaskId[ind] = taskSpawn(PERIODSCAN_NAME,PERIODSCAN_PRI-ind,
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PERIODSCAN_OPT,PERIODSCAN_STACK,
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(FUNCPTR )periodicTask,psl);
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taskwdInsert(periodicTaskId[ind],wdPeriodic,(void *)(long)ind);
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}
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static void wdPeriodic(long ind)
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{
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struct scan_list *psl;
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psl = papPeriodic[ind];
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taskwdRemove(periodicTaskId[ind]);
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if(!scanRestart)return;
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FASTUNLOCK(&psl->lock);
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spawnPeriodic(ind);
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}
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static void eventTask()
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{
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unsigned char event;
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struct scan_element *pse,*prev,*next;
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struct scan_list *psl;
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while(TRUE) {
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if(semTake(eventSem,WAIT_FOREVER)!=OK)
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logMsg("semTake returned error in eventTask\n");
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while (rngNBytes(eventQ)>=sizeof(unsigned char)){
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if(rngBufGet(eventQ,(void *)&event,sizeof(unsigned char))!=sizeof(unsigned char))
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logMsg("rngBufGet returned error in eventTask\n");
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if(event<0 || event>MAX_EVENTS-1) {
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errMessage(-1,"eventTask received an illegal event");
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continue;
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}
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if(papEvent[event]==NULL) continue;
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psl = papEvent[event];
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if(psl) scanList(psl);
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}
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}
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}
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static void initEvent()
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{
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int i;
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for(i=0; i<MAX_EVENTS; i++) papEvent[i] = 0;
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eventQ = rngCreate(sizeof(unsigned char) * EVENT_QUEUE_SIZE);
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if(eventQ==NULL) {
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errMessage(0,"initEvent failed");
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exit(1);
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}
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if((eventSem=semBCreate(SEM_Q_FIFO,SEM_EMPTY))==NULL)
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logMsg("semBcreate failed in initEvent\n");
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}
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static void spawnEvent()
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{
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eventTaskId = taskSpawn(EVENTSCAN_NAME,EVENTSCAN_PRI,EVENTSCAN_OPT,
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EVENTSCAN_STACK,(FUNCPTR)eventTask);
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taskwdInsert(eventTaskId,wdEvent,0L);
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}
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static void wdEvent()
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{
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int i;
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struct scan_list *psl;
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taskwdRemove(eventTaskId);
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if(!scanRestart) return;
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if(semFlush(eventSem)!=OK)
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logMsg("semFlush failed while restarting eventTask\n");
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rngFlush(eventQ);
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for (i=0; i<MAX_EVENTS; i++) {
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psl = papEvent[i];
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if(psl==NULL) continue;
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FASTUNLOCK(&psl->lock);
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||
}
|
||
spawnEvent();
|
||
}
|
||
|
||
static void ioeventCallback(struct io_scan_list *piosl)
|
||
{
|
||
struct scan_list *psl=&piosl->scan_list;
|
||
|
||
scanList(psl);
|
||
}
|
||
|
||
|
||
static void printList(struct scan_list *psl,char *message)
|
||
{
|
||
struct scan_element *pse;
|
||
|
||
FASTLOCK(&psl->lock);
|
||
(void *)pse = lstFirst(&psl->list);
|
||
FASTUNLOCK(&psl->lock);
|
||
if(pse==NULL) return;
|
||
printf("%s\n",message);
|
||
while(pse!=NULL) {
|
||
printf(" %-28s\n",pse->precord->name);
|
||
FASTLOCK(&psl->lock);
|
||
if(pse->pscan_list != psl) {
|
||
FASTUNLOCK(&psl->lock);
|
||
printf("Returning because list changed while processing.");
|
||
return;
|
||
}
|
||
(void *)pse = lstNext((void *)pse);
|
||
FASTUNLOCK(&psl->lock);
|
||
}
|
||
}
|
||
|
||
static void scanList(struct scan_list *psl)
|
||
{
|
||
/*In reading this code remember that the call to dbProcess can result*/
|
||
/*in the SCAN field being changed in an arbitrary number of records */
|
||
|
||
struct scan_element *pse,*prev,*next;
|
||
|
||
FASTLOCK(&psl->lock);
|
||
psl->modified = FALSE;
|
||
(void *)pse = lstFirst(&psl->list);
|
||
prev = NULL;
|
||
(void *)next = lstNext((void *)pse);
|
||
FASTUNLOCK(&psl->lock);
|
||
while(pse!=NULL) {
|
||
struct dbCommon *precord = pse->precord;
|
||
|
||
dbScanLock(precord);
|
||
dbProcess(precord);
|
||
dbScanUnlock(precord);
|
||
FASTLOCK(&psl->lock);
|
||
if(!psl->modified) {
|
||
prev = pse;
|
||
(void *)pse = lstNext((void *)pse);
|
||
if(pse!=NULL) (void *)next = lstNext((void *)pse);
|
||
} else if (pse->pscan_list==psl) {
|
||
/*This scan element is still in same scan list*/
|
||
prev = pse;
|
||
(void *)pse = lstNext((void *)pse);
|
||
if(pse!=NULL) (void *)next = lstNext((void *)pse);
|
||
psl->modified = FALSE;
|
||
} else if (prev!=NULL && prev->pscan_list==psl) {
|
||
/*Previous scan element is still in same scan list*/
|
||
(void *)pse = lstNext((void *)prev);
|
||
if(pse!=NULL) {
|
||
(void *)prev = lstPrevious((void *)pse);
|
||
(void *)next = lstNext((void *)pse);
|
||
}
|
||
psl->modified = FALSE;
|
||
} else if (next!=NULL && next->pscan_list==psl) {
|
||
/*Next scan element is still in same scan list*/
|
||
pse = next;
|
||
(void *)prev = lstPrevious((void *)pse);
|
||
(void *)next = lstNext((void *)pse);
|
||
psl->modified = FALSE;
|
||
} else {
|
||
/*Too many changes. Just wait till next period*/
|
||
FASTUNLOCK(&psl->lock);
|
||
return;
|
||
}
|
||
FASTUNLOCK(&psl->lock);
|
||
}
|
||
}
|
||
|
||
static void buildScanLists()
|
||
{
|
||
struct recLoc *precLoc;
|
||
struct dbCommon *precord; /* pointer to record */
|
||
int i,j;
|
||
|
||
if(dbRecords==NULL) {
|
||
errMessage(S_record_noRecords,
|
||
"Error detected in build_scan_lists");
|
||
exit(1);
|
||
}
|
||
/* look through all of the database records and place them on lists */
|
||
for (i=0; i<dbRecords->number; i++) {
|
||
if((precLoc=dbRecords->papRecLoc[i])==NULL) continue;
|
||
for(j=0, precord=(struct dbCommon*)(precLoc->pFirst);
|
||
j<precLoc->no_records;
|
||
j++, precord = (struct dbCommon *)
|
||
((char *)precord + precLoc->rec_size)) {
|
||
if(precord->name[0]==0) continue;
|
||
scanAdd(precord);
|
||
}
|
||
}
|
||
}
|
||
|
||
static void addToList(struct dbCommon *precord,struct scan_list *psl)
|
||
{
|
||
struct scan_element *pse,*ptemp;
|
||
|
||
FASTLOCK(&psl->lock);
|
||
pse = (struct scan_element *)(precord->spvt);
|
||
if(pse==NULL) {
|
||
pse = calloc(1,sizeof(struct scan_element));
|
||
if(pse==NULL) {
|
||
recGblRecordError(-1,precord,"addToList calloc error");
|
||
exit(1);
|
||
}
|
||
precord->spvt = (void *)pse;
|
||
(void *)pse->precord = precord;
|
||
}
|
||
pse ->pscan_list = psl;
|
||
(void *)ptemp = lstFirst(&psl->list);
|
||
while(ptemp!=NULL) {
|
||
if(ptemp->precord->phas>precord->phas) {
|
||
lstInsert(&psl->list,
|
||
lstPrevious((void *)ptemp),(void *)pse);
|
||
break;
|
||
}
|
||
(void *)ptemp = lstNext((void *)ptemp);
|
||
}
|
||
if(ptemp==NULL) lstAdd(&psl->list,(void *)pse);
|
||
psl->modified = TRUE;
|
||
FASTUNLOCK(&psl->lock);
|
||
return;
|
||
}
|
||
|
||
static void deleteFromList(struct dbCommon *precord,struct scan_list *psl)
|
||
{
|
||
struct scan_element *pse;
|
||
|
||
FASTLOCK(&psl->lock);
|
||
if(precord->spvt==NULL) {
|
||
FASTUNLOCK(&psl->lock);
|
||
return;
|
||
}
|
||
pse = (struct scan_element *)(precord->spvt);
|
||
if(pse==NULL || pse->pscan_list!=psl) {
|
||
FASTUNLOCK(&psl->lock);
|
||
errMessage(-1,"deleteFromList failed");
|
||
return;
|
||
}
|
||
pse->pscan_list = NULL;
|
||
lstDelete(&psl->list,(void *)pse);
|
||
psl->modified = TRUE;
|
||
FASTUNLOCK(&psl->lock);
|
||
return;
|
||
}
|