Michael Davidsaver
ec0b21d27c
previously, ~SingleSourceSubscriptionCtx would ~MonitorControlOp before the base class ~SubscriptionCtx would db_cancel_event() leading to a use-after-free.
63 lines
1.6 KiB
C++
63 lines
1.6 KiB
C++
/*
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* Copyright - See the COPYRIGHT that is included with this distribution.
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* pvxs 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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* Author George S. McIntyre <george@level-n.com>, 2023
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*
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*/
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#ifndef PVXS_SINGLESRCSUBSCRIPTIONCTX_H
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#define PVXS_SINGLESRCSUBSCRIPTIONCTX_H
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#include <pvxs/source.h>
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#include "channel.h"
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#include "fieldconfig.h"
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#include "subscriptionctx.h"
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#include "utilpvt.h"
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namespace pvxs {
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namespace ioc {
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struct SingleInfo : public MappingInfo {
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Channel chan;
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INST_COUNTER(SingleInfo);
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explicit SingleInfo(Channel&& chan) :chan(std::move(chan)) {
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updateNsecMask(dbChannelRecord(this->chan));
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}
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};
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/**
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* A subscription context
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*/
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class SingleSourceSubscriptionCtx : public SubscriptionCtx {
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public:
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explicit SingleSourceSubscriptionCtx(const std::shared_ptr<SingleInfo>& sInfo);
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// extra dbChannel* to have a distinct state for any server side filters. (eg. decimate)
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const Channel pPropertiesChannel;
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// This is used to store the current value. Each subscription event simply merges
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// new fields into this value
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Value currentValue{};
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std::shared_ptr<SingleInfo> info;
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epicsMutex eventLock{};
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std::unique_ptr<server::MonitorControlOp> subscriptionControl{};
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bool eventsEnabled = false;
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INST_COUNTER(SingleSourceSubscriptionCtx);
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~SingleSourceSubscriptionCtx() {
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assert(!eventsEnabled);
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// must db_cancel_event() before ~MonitorControlOp
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cancel();
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}
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};
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} // ioc
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} // pvxs
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#endif //PVXS_SINGLESRCSUBSCRIPTIONCTX_H
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