293 lines
9.0 KiB
C++
293 lines
9.0 KiB
C++
/*************************************************************************\
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* Copyright (c) 2002 The University of Chicago, as Operator of Argonne
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* National Laboratory.
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* Copyright (c) 2002 The Regents of the University of California, as
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* Operator of Los Alamos National Laboratory.
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* EPICS BASE Versions 3.13.7
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* and higher are distributed subject to a Software License Agreement found
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* in file LICENSE that is included with this distribution.
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\*************************************************************************/
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/*
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* $Id$
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*
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*
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* L O S A L A M O S
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* Los Alamos National Laboratory
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* Los Alamos, New Mexico 87545
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*
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* Copyright, 1986, The Regents of the University of California.
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*
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*
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* Author Jeffrey O. Hill
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* johill@lanl.gov
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* 505 665 1831
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*/
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#include <limits.h>
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#include "epicsMutex.h"
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#include "tsFreeList.h"
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#include "cadef.h" // this can be eliminated when the callbacks use the new interface
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#include "db_access.h" // should be eliminated here in the future
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#include "caerr.h" // should be eliminated here in the future
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#include "epicsEvent.h"
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#include "epicsThread.h"
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#include "epicsSingleton.h"
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#define epicsExportSharedSymbols
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#include "db_access_routines.h"
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#include "dbCAC.h"
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#include "dbChannelIO.h"
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#include "dbPutNotifyBlocker.h"
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class dbServiceIOLoadTimeInit {
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public:
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dbServiceIOLoadTimeInit ();
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private:
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dbServiceIO dbio;
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dbServiceIOLoadTimeInit ( const dbServiceIOLoadTimeInit & );
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dbServiceIOLoadTimeInit & operator = ( const dbServiceIOLoadTimeInit & );
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};
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// The following is just to force lti to be constructed
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extern "C" void dbServiceIOInit()
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{
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static dbServiceIOLoadTimeInit lti;
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}
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dbBaseIO::dbBaseIO () {}
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dbServiceIOLoadTimeInit::dbServiceIOLoadTimeInit ()
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{
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pGlobalServiceListCAC->registerService ( this->dbio );
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}
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dbServiceIO::dbServiceIO () :
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ctx ( 0 ), stateNotifyCacheSize ( 0 ),
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pStateNotifyCache ( 0 )
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{
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}
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dbServiceIO::~dbServiceIO ()
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{
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delete [] this->pStateNotifyCache;
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if ( this->ctx ) {
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db_close_events ( this->ctx );
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}
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}
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cacChannel *dbServiceIO::createChannel ( // X aCC 361
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const char *pName, cacChannelNotify ¬ify,
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cacChannel::priLev )
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{
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struct dbAddr addr;
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int status = db_name_to_addr ( pName, &addr );
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if ( status ) {
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return 0;
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}
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else if ( ! ca_preemtive_callback_is_enabled () ) {
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errlogPrintf (
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"dbServiceIO: preemptive callback required for direct in\n"
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"memory interfacing of CA channels to the DB.\n" );
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return 0;
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}
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else {
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return new dbChannelIO ( notify, addr, *this );
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}
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}
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void dbServiceIO::callStateNotify ( struct dbAddr & addr,
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unsigned type, unsigned long count,
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const struct db_field_log * pfl,
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cacStateNotify & notify )
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{
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unsigned long size = dbr_size_n ( type, count );
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if ( type > INT_MAX ) {
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notify.exception ( ECA_BADTYPE,
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"type code out of range (high side)",
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type, count );
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return;
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}
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if ( count > INT_MAX ) {
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notify.exception ( ECA_BADCOUNT,
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"element count out of range (high side)",
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type, count);
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return;
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}
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// no need to lock this because state notify is
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// called from only one event queue consumer thread
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if ( this->stateNotifyCacheSize < size) {
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char * pTmp = new char [size];
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delete [] this->pStateNotifyCache;
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this->pStateNotifyCache = pTmp;
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this->stateNotifyCacheSize = size;
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}
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void *pvfl = (void *) pfl;
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int status = db_get_field ( &addr, static_cast <int> ( type ),
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this->pStateNotifyCache, static_cast <int> ( count ), pvfl );
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if ( status ) {
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notify.exception ( ECA_GETFAIL,
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"db_get_field() completed unsuccessfuly", type, count );
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}
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else {
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notify.current ( type, count, this->pStateNotifyCache );
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}
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}
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extern "C" void cacAttachClientCtx ( void * pPrivate )
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{
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int status = ca_attach_context ( (ca_client_context *) pPrivate );
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assert ( status == ECA_NORMAL );
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}
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dbEventSubscription dbServiceIO::subscribe ( struct dbAddr & addr, dbChannelIO & chan,
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dbSubscriptionIO & subscr, unsigned mask )
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{
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dbEventSubscription es;
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int status;
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{
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epicsGuard < epicsMutex > locker ( this->mutex );
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if ( ! this->ctx ) {
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this->ctx = db_init_events ();
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if ( ! this->ctx ) {
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return 0;
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}
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unsigned selfPriority = epicsThreadGetPrioritySelf ();
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unsigned above;
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epicsThreadBooleanStatus tbs = epicsThreadLowestPriorityLevelAbove (selfPriority, &above);
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if ( tbs != epicsThreadBooleanStatusSuccess ) {
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above = selfPriority;
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}
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status = db_start_events ( this->ctx, "CAC-event",
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cacAttachClientCtx, ca_current_context (), above );
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if ( status ) {
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db_close_events ( this->ctx );
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this->ctx = 0;
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return 0;
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}
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}
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chan.dbServicePrivateListOfIO::eventq.add ( subscr );
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this->ioTable.add ( subscr );
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}
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es = db_add_event ( this->ctx, &addr,
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dbSubscriptionEventCallback, (void *) &subscr, mask );
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if ( ! es ) {
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epicsGuard < epicsMutex > locker ( this->mutex );
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chan.dbServicePrivateListOfIO::eventq.remove ( subscr );
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this->ioTable.remove ( subscr );
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}
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return es;
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}
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void dbServiceIO::initiatePutNotify (
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dbChannelIO & chan, struct dbAddr & addr,
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unsigned type, unsigned long count, const void * pValue,
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cacWriteNotify & notify, cacChannel::ioid * pId )
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{
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epicsGuard < epicsMutex > locker ( this->mutex );
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if ( ! chan.dbServicePrivateListOfIO::pBlocker ) {
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chan.dbServicePrivateListOfIO::pBlocker = new dbPutNotifyBlocker ( chan );
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this->ioTable.add ( *chan.dbServicePrivateListOfIO::pBlocker );
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}
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chan.dbServicePrivateListOfIO::pBlocker->initiatePutNotify (
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locker, notify, addr, type, count, pValue );
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if ( pId ) {
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*pId = chan.dbServicePrivateListOfIO::pBlocker->getId ();
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}
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}
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void dbServiceIO::destroyAllIO ( dbChannelIO & chan )
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{
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dbSubscriptionIO *pIO;
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tsDLList < dbSubscriptionIO > tmp;
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{
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epicsGuard < epicsMutex > locker ( this->mutex );
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while ( ( pIO = chan.dbServicePrivateListOfIO::eventq.get() ) ) {
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this->ioTable.remove ( *pIO );
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tmp.add ( *pIO );
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}
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if ( chan.dbServicePrivateListOfIO::pBlocker ) {
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this->ioTable.remove ( *chan.dbServicePrivateListOfIO::pBlocker );
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}
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}
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while ( ( pIO = tmp.get() ) ) {
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// This prevents a db event callback from coming
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// through after the notify IO is deleted
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pIO->unsubscribe ();
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// If they call ioCancel() here it will be ignored
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// because the IO has been unregistered above.
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pIO->channelDeleteException ();
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pIO->destroy ();
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}
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if ( chan.dbServicePrivateListOfIO::pBlocker ) {
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chan.dbServicePrivateListOfIO::pBlocker->destroy ();
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}
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}
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void dbServiceIO::ioCancel ( dbChannelIO & chan, const cacChannel::ioid &id )
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{
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epicsGuard < epicsMutex > locker ( this->mutex );
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dbBaseIO *pIO = this->ioTable.remove ( id );
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if ( pIO ) {
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dbSubscriptionIO *pSIO = pIO->isSubscription ();
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if ( pSIO ) {
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chan.dbServicePrivateListOfIO::eventq.remove ( *pSIO );
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pIO->destroy ();
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}
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else if ( pIO == chan.dbServicePrivateListOfIO::pBlocker ) {
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chan.dbServicePrivateListOfIO::pBlocker->cancel ();
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}
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else {
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errlogPrintf ( "dbServiceIO::ioCancel() unrecognized IO was probably leaked\n" );
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}
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}
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}
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void dbServiceIO::ioShow ( const cacChannel::ioid &id, unsigned level ) const
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{
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epicsGuard < epicsMutex > locker ( this->mutex );
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const dbBaseIO *pIO = this->ioTable.lookup ( id );
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if ( pIO ) {
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pIO->show ( level );
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}
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}
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void dbServiceIO::showAllIO ( const dbChannelIO &chan, unsigned level ) const
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{
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epicsGuard < epicsMutex > locker ( this->mutex );
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tsDLIterConstBD < dbSubscriptionIO > pItem =
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chan.dbServicePrivateListOfIO::eventq.firstIter ();
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while ( pItem.valid () ) {
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pItem->show ( level );
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pItem++;
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}
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if ( chan.dbServicePrivateListOfIO::pBlocker ) {
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chan.dbServicePrivateListOfIO::pBlocker->show ( level );
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}
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}
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void dbServiceIO::show ( unsigned level ) const
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{
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epicsGuard < epicsMutex > locker ( this->mutex );
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printf ( "dbServiceIO at %p\n",
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static_cast <const void *> ( this ) );
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if ( level > 0u ) {
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printf ( "\tevent call back cache location %p, and its size %lu\n",
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static_cast <void *> ( this->pStateNotifyCache ), this->stateNotifyCacheSize );
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this->readNotifyCache.show ( level - 1 );
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}
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if ( level > 1u ) {
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this->mutex.show ( level - 2u );
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}
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}
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