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Make sure rate-limiting code is thread-safe

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Gavin Andresen 2011-03-13 14:38:07 -04:00
parent 5de8b54c51
commit 88abf70386
1 changed files with 17 additions and 10 deletions
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7
main.cpp
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@ -739,11 +739,17 @@ bool CTransaction::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs, bool* pfMi
return error("AcceptToMemoryPool() : not enough fees"); return error("AcceptToMemoryPool() : not enough fees");
// Continuously rate-limit free transactions // Continuously rate-limit free transactions
// This mitigates 'penny-flooding' -- sending thousands of free transactions just to
// be annoying or make other's transactions take longer to confirm.
if (nFees < CENT) if (nFees < CENT)
{ {
static CCriticalSection cs;
static double dFreeCount; static double dFreeCount;
static int64 nLastTime; static int64 nLastTime;
int64 nNow = GetTime(); int64 nNow = GetTime();
CRITICAL_BLOCK(cs)
{
// Use an exponentially decaying ~10-minute window: // Use an exponentially decaying ~10-minute window:
dFreeCount *= pow(1.0 - 1.0/600.0, (double)(nNow - nLastTime)); dFreeCount *= pow(1.0 - 1.0/600.0, (double)(nNow - nLastTime));
nLastTime = nNow; nLastTime = nNow;
@ -756,6 +762,7 @@ bool CTransaction::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs, bool* pfMi
dFreeCount += nSize; dFreeCount += nSize;
} }
} }
}
// Store transaction in memory // Store transaction in memory
CRITICAL_BLOCK(cs_mapTransactions) CRITICAL_BLOCK(cs_mapTransactions)