266 lines
7.8 KiB
C++
266 lines
7.8 KiB
C++
#include <dbAccess.h>
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#include <epicsAtomic.h>
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#include <errlog.h>
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#include <pv/epicsException.h>
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#include "errlogstream.h"
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#include "helper.h"
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#include "pdbsingle.h"
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#include "pdb.h"
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namespace pvd = epics::pvData;
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namespace pva = epics::pvAccess;
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size_t PDBSinglePV::ninstances;
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typedef epicsGuard<epicsMutex> Guard;
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static
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void pdb_single_event(void *user_arg, struct dbChannel *chan,
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int eventsRemaining, struct db_field_log *pfl)
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{
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DBEvent *evt=(DBEvent*)user_arg;
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try{
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PDBSinglePV::shared_pointer self(std::tr1::static_pointer_cast<PDBSinglePV>(((PDBSinglePV*)evt->self)->shared_from_this()));
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{
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Guard G(self->lock); // TODO: lock order?
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{
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DBScanLocker L(dbChannelRecord(self->chan));
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self->pvif->put(self->scratch, evt->dbe_mask, pfl);
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}
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if(evt->dbe_mask&DBE_PROPERTY)
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self->hadevent_PROPERTY = true;
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else
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self->hadevent_VALUE = true;
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if(!self->hadevent_VALUE || !self->hadevent_PROPERTY)
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return;
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FOREACH(it, end, self->interested) {
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PDBSingleMonitor& mon = *it->get();
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mon.post(self->scratch);
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}
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self->scratch.clear();
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}
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}catch(std::tr1::bad_weak_ptr&){
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/* We are racing destruction of the PDBSinglePV, but things are ok.
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* The destructor is running, but has not completed db_cancel_event()
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* so storage is still valid.
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* Just do nothing
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*/
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}catch(std::exception& e){
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errlog_ostream strm;
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strm<<"Unhandled exception in pdb_single_event(): "<<e.what()<<"\n"
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<<SHOW_EXCEPTION(e)<<"\n";
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}
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}
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PDBSinglePV::PDBSinglePV(DBCH& chan,
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const PDBProvider::shared_pointer& prov)
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:provider(prov)
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,evt_VALUE(this)
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,evt_PROPERTY(this)
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,hadevent_VALUE(false)
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,hadevent_PROPERTY(false)
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{
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this->chan.swap(chan);
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fielddesc = PVIF::dtype(this->chan);
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complete = pvd::getPVDataCreate()->createPVStructure(fielddesc);
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pvif.reset(PVIF::attach(this->chan, complete));
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epics::atomic::increment(ninstances);
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}
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PDBSinglePV::~PDBSinglePV()
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{
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epics::atomic::decrement(ninstances);
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}
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void PDBSinglePV::activate()
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{
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evt_VALUE.create(provider->event_context, this->chan, &pdb_single_event, DBE_VALUE|DBE_ALARM);
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evt_PROPERTY.create(provider->event_context, this->chan, &pdb_single_event, DBE_PROPERTY);
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}
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pva::Channel::shared_pointer
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PDBSinglePV::connect(const std::tr1::shared_ptr<PDBProvider>& prov,
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const pva::ChannelRequester::shared_pointer& req)
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{
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pva::Channel::shared_pointer ret(new PDBSingleChannel(shared_from_this(), req));
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return ret;
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}
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PDBSingleChannel::PDBSingleChannel(const PDBSinglePV::shared_pointer& pv,
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const pva::ChannelRequester::shared_pointer& req)
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:BaseChannel(dbChannelName(pv->chan), pv->provider, req, pv->fielddesc)
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,pv(pv)
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{
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assert(!!this->pv);
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}
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void PDBSingleChannel::printInfo(std::ostream& out)
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{
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out<<"PDB single : "<<pvname<<"\n";
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}
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pva::ChannelGet::shared_pointer
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PDBSingleChannel::createChannelGet(
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pva::ChannelGetRequester::shared_pointer const & requester,
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pvd::PVStructure::shared_pointer const & pvRequest)
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{
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pva::ChannelGet::shared_pointer ret(new PDBSingleGet(shared_from_this(), requester, pvRequest));
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requester->channelGetConnect(pvd::Status(), ret, fielddesc);
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return ret;
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}
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pva::ChannelPut::shared_pointer
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PDBSingleChannel::createChannelPut(
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pva::ChannelPutRequester::shared_pointer const & requester,
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pvd::PVStructure::shared_pointer const & pvRequest)
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{
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pva::ChannelPut::shared_pointer ret(new PDBSinglePut(shared_from_this(), requester, pvRequest));
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requester->channelPutConnect(pvd::Status(), ret, fielddesc);
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return ret;
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}
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pva::Monitor::shared_pointer
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PDBSingleChannel::createMonitor(
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pva::MonitorRequester::shared_pointer const & requester,
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pvd::PVStructure::shared_pointer const & pvRequest)
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{
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PDBSingleMonitor::shared_pointer ret(new PDBSingleMonitor(pv->shared_from_this(), requester, pvRequest));
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ret->weakself = ret;
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assert(!!pv->complete);
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ret->connect(pv->complete);
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return ret;
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}
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PDBSingleGet::PDBSingleGet(const PDBSingleChannel::shared_pointer &channel,
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const pva::ChannelGetRequester::shared_pointer& requester,
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const pvd::PVStructure::shared_pointer &pvReq)
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:channel(channel)
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,requester(requester)
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,changed(new pvd::BitSet(channel->fielddesc->getNumberFields()))
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,pvf(pvd::getPVDataCreate()->createPVStructure(channel->fielddesc))
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,pvif(PVIF::attach(channel->pv->chan, pvf))
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{}
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namespace {
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void commonGet(PVIF *pvif, pvd::BitSet* changed)
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{
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changed->clear();
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{
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DBScanLocker L(pvif->chan);
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pvif->put(*changed, DBE_VALUE|DBE_ALARM|DBE_PROPERTY, NULL);
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}
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//TODO: report unused fields as changed?
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changed->clear();
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changed->set(0);
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}
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}
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void PDBSingleGet::get()
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{
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commonGet(pvif.get(), changed.get());
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requester->getDone(pvd::Status(), shared_from_this(), pvf, changed);
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}
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PDBSinglePut::PDBSinglePut(const PDBSingleChannel::shared_pointer &channel,
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const pva::ChannelPutRequester::shared_pointer &requester,
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const pvd::PVStructure::shared_pointer &pvReq)
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:channel(channel)
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,requester(requester)
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,changed(new pvd::BitSet(channel->fielddesc->getNumberFields()))
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,pvf(pvd::getPVDataCreate()->createPVStructure(channel->fielddesc))
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,pvif(PVIF::attach(channel->pv->chan, pvf))
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{}
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void PDBSinglePut::put(pvd::PVStructure::shared_pointer const & value,
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pvd::BitSet::shared_pointer const & changed)
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{
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// assume value may be a different struct each time
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std::auto_ptr<PVIF> putpvif(PVIF::attach(channel->pv->chan, value));
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{
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DBScanLocker L(channel->pv->chan);
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putpvif->get(*changed);
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}
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requester->putDone(pvd::Status(), shared_from_this());
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}
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void PDBSinglePut::get()
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{
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commonGet(pvif.get(), changed.get());
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requester->getDone(pvd::Status(), shared_from_this(), pvf, changed);
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}
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PDBSingleMonitor::PDBSingleMonitor(const PDBSinglePV::shared_pointer& pv,
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const requester_t::shared_pointer& requester,
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const pvd::PVStructure::shared_pointer& pvReq)
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:BaseMonitor(requester, pvReq)
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,pv(pv)
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{}
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void PDBSingleMonitor::destroy()
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{
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BaseMonitor::destroy();
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PDBSinglePV::shared_pointer pv;
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{
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Guard G(lock);
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this->pv.swap(pv);
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}
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}
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void PDBSingleMonitor::onStart()
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{
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guard_t G(pv->lock);
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pv->scratch.clear();
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pv->scratch.set(0);
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if(pv->interested.empty()) {
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// first subscriber
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pv->hadevent_VALUE = false;
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pv->hadevent_PROPERTY = false;
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db_event_enable(pv->evt_VALUE.subscript);
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db_event_enable(pv->evt_PROPERTY.subscript);
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db_post_single_event(pv->evt_VALUE.subscript);
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db_post_single_event(pv->evt_PROPERTY.subscript);
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} else if(pv->hadevent_VALUE && pv->hadevent_PROPERTY) {
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// new subscriber and already had initial update
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post();
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} // else new subscriber, but no initial update. so just wait
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shared_pointer self(std::tr1::static_pointer_cast<PDBSingleMonitor>(shared_from_this()));
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pv->interested.insert(self);
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}
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void PDBSingleMonitor::onStop()
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{
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guard_t G(pv->lock);
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shared_pointer self(std::tr1::static_pointer_cast<PDBSingleMonitor>(shared_from_this()));
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if(pv->interested.erase(self)==0) {
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fprintf(stderr, "%s: oops\n", __FUNCTION__);
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}
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if(pv->interested.empty()) {
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// last subscriber
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db_event_disable(pv->evt_VALUE.subscript);
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db_event_disable(pv->evt_PROPERTY.subscript);
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}
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}
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void PDBSingleMonitor::requestUpdate()
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{
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Guard G(pv->lock);
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post();
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}
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