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Merge bitcoin/bitcoin#21750: net: remove unnecessary check of CNode::cs_vSend

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9096b13a47 net: remove unnecessary check of CNode::cs_vSend (Vasil Dimov)

Pull request description:

  It is not possible to have a node in `CConnman::vNodesDisconnected` and
  its reference count to be incremented - all `CNode::AddRef()` are done
  either before the node is added to `CConnman::vNodes` or while holding
  `CConnman::cs_vNodes` and the object being in `CConnman::vNodes`.

  So, the object being in `CConnman::vNodesDisconnected` and its reference
  count being zero means that it is not and will not start to be used by
  other threads.

  So, the lock of `CNode::cs_vSend` in `CConnman::DisconnectNodes()` will
  always succeed and is not necessary.

  Indeed all locks of `CNode::cs_vSend` are done either when the reference
  count is >0 or under the protection of `CConnman::cs_vNodes` and the
  node being in `CConnman::vNodes`.

ACKs for top commit:
  MarcoFalke:
    review ACK 9096b13a47 🏧
  jnewbery:
    utACK 9096b13a47

Tree-SHA512: 910899cdcdc8934642eb0c40fcece8c3b01b7e20a0b023966b9d6972db6a885cb3a9a04e9562bae14d5833967e45e2ecb3687b94d495060c3da4b1f2afb0ac8f
This commit is contained in:
MarcoFalke 2021-05-03 08:13:49 +02:00
commit 320e518b90
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1 changed files with 3 additions and 12 deletions
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11
src/net.cpp
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@ -1224,23 +1224,14 @@ void CConnman::DisconnectNodes()
std::list<CNode*> vNodesDisconnectedCopy = vNodesDisconnected;
for (CNode* pnode : vNodesDisconnectedCopy)
{
// wait until threads are done using it
// Destroy the object only after other threads have stopped using it.
if (pnode->GetRefCount() <= 0) {
bool fDelete = false;
{
TRY_LOCK(pnode->cs_vSend, lockSend);
if (lockSend) {
fDelete = true;
}
}
if (fDelete) {
vNodesDisconnected.remove(pnode);
DeleteNode(pnode);
}
}
}
}
}
void CConnman::NotifyNumConnectionsChanged()
{