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Shmem: Fix handling of empty message parts

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This commit is contained in:
Alexey Rybalchenko 2019-10-29 13:53:06 +01:00 committed by Dennis Klein
parent c34d1f0946
commit 85a3a254d4
1 changed files with 12 additions and 1 deletions
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13
fairmq/shmem/FairMQSocketSHM.cxx
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@ -272,7 +272,18 @@ int64_t FairMQSocketSHM::Send(vector<FairMQMessagePtr>& msgVec, const int timeou
for (auto& msg : msgVec)
{
zmq_msg_t* metaMsg = static_cast<FairMQMessageSHM*>(msg.get())->GetMessage();
memcpy(metas++, zmq_msg_data(metaMsg), sizeof(MetaHeader));
if (zmq_msg_size(metaMsg) > 0) {
memcpy(metas++, zmq_msg_data(metaMsg), sizeof(MetaHeader));
} else {
// if the message is empty, create meta data to reflect this
// (always creating meta data for empty messages would add an unnecessary allocation for the receive case, so we do it lazily here)
MetaHeader hdr;
hdr.fSize = 0;
hdr.fHandle = -1;
hdr.fRegionId = 0;
hdr.fHint = 0;
memcpy(metas++, &hdr, sizeof(MetaHeader));
}
}
while (!fInterrupted)