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Callbacks are called when the data buffer of the message assiciated with the corresponding region is no longer needed by the transport. Example in examples/advanced/Region/
72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
/********************************************************************************
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* Copyright (C) 2014 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH *
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* *
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* This software is distributed under the terms of the *
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* GNU Lesser General Public Licence version 3 (LGPL) version 3, *
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* copied verbatim in the file "LICENSE" *
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********************************************************************************/
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/**
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* FairMQExampleRegionSampler.cpp
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*
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* @since 2014-10-10
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* @author A. Rybalchenko
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*/
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#include "FairMQExampleRegionSampler.h"
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#include "FairMQLogger.h"
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#include "FairMQProgOptions.h" // device->fConfig
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#include <thread>
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#include <atomic>
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using namespace std;
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FairMQExampleRegionSampler::FairMQExampleRegionSampler()
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: fMsgSize(10000)
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, fRegion(nullptr)
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, fNumUnackedMsgs(0)
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{
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}
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void FairMQExampleRegionSampler::InitTask()
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{
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fMsgSize = fConfig->GetValue<int>("msg-size");
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fRegion = FairMQUnmanagedRegionPtr(NewUnmanagedRegionFor("data",
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0,
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10000000,
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[this](void* data, size_t size) { --fNumUnackedMsgs; } // callback to be called when message buffers no longer needed by transport
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));
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}
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bool FairMQExampleRegionSampler::ConditionalRun()
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{
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FairMQMessagePtr msg(NewMessageFor("data", // channel
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0, // sub-channel
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fRegion, // region
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fRegion->GetData(), // ptr within region
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fMsgSize // offset from ptr
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));
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if (Send(msg, "data", 0) > 0)
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{
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++fNumUnackedMsgs;
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}
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return true;
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}
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void FairMQExampleRegionSampler::ResetTask()
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{
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// if not all messages acknowledged, wait for a bit. But only once, since receiver could be already dead.
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if (fNumUnackedMsgs != 0)
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{
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LOG(DEBUG) << "waiting for all acknowledgements... (" << fNumUnackedMsgs << ")";
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this_thread::sleep_for(chrono::milliseconds(500));
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}
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fRegion.reset();
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}
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FairMQExampleRegionSampler::~FairMQExampleRegionSampler()
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{
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}
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