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Merge pull request #500 from gavinandresen/txndeadlock

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Fix AddAddress cs_mapaddresses/db transaction deadlock
This commit is contained in:
Gavin Andresen 2011-09-07 07:29:44 -07:00
commit f92f022eda
1 changed files with 21 additions and 15 deletions
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36
src/net.cpp
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@ -443,6 +443,10 @@ bool AddAddress(CAddress addr, int64 nTimePenalty, CAddrDB *pAddrDB)
if (addr.ip == addrLocalHost.ip)
return false;
addr.nTime = max((int64)0, (int64)addr.nTime - nTimePenalty);
bool fUpdated = false;
bool fNew = false;
CAddress addrFound = addr;
CRITICAL_BLOCK(cs_mapAddresses)
{
map<vector<unsigned char>, CAddress>::iterator it = mapAddresses.find(addr.GetKey());
@ -451,16 +455,12 @@ bool AddAddress(CAddress addr, int64 nTimePenalty, CAddrDB *pAddrDB)
// New address
printf("AddAddress(%s)\n", addr.ToString().c_str());
mapAddresses.insert(make_pair(addr.GetKey(), addr));
if (pAddrDB)
pAddrDB->WriteAddress(addr);
else
CAddrDB().WriteAddress(addr);
return true;
fUpdated = true;
fNew = true;
}
else
{
bool fUpdated = false;
CAddress& addrFound = (*it).second;
addrFound = (*it).second;
if ((addrFound.nServices | addr.nServices) != addrFound.nServices)
{
// Services have been added
@ -475,16 +475,22 @@ bool AddAddress(CAddress addr, int64 nTimePenalty, CAddrDB *pAddrDB)
addrFound.nTime = addr.nTime;
fUpdated = true;
}
if (fUpdated)
{
if (pAddrDB)
pAddrDB->WriteAddress(addrFound);
else
CAddrDB().WriteAddress(addrFound);
}
}
}
return false;
// There is a nasty deadlock bug if this is done inside the cs_mapAddresses
// CRITICAL_BLOCK:
// Thread 1: begin db transaction (locks inside-db-mutex)
// then AddAddress (locks cs_mapAddresses)
// Thread 2: AddAddress (locks cs_mapAddresses)
// ... then db operation hangs waiting for inside-db-mutex
if (fUpdated)
{
if (pAddrDB)
pAddrDB->WriteAddress(addrFound);
else
CAddrDB().WriteAddress(addrFound);
}
return fNew;
}
void AddressCurrentlyConnected(const CAddress& addr)