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Fix Bulk Copy Async deadlock with custom IDataReader using SqlDataReader internally. #779

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Merged
merged 2 commits into from
Nov 4, 2020
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Fix Bulk Copy Async deadlock with custom IDataReader using SqlDataReader internally. #779

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6668a62
Fix Bulk Copy Async deadlock with custom IDataReader using SqlDataRea…
cheenamalhotra Oct 30, 2020
d406009
Revert unwanted flag change
cheenamalhotra Oct 30, 2020
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9 changes: 9 additions & 0 deletions src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SqlBulkCopy.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1159,6 +1159,11 @@ private Task ReadFromRowSourceAsync(CancellationToken cts)
}
else
{ // This will call Read for DataRows, DataTable and IDataReader (this includes all IDataReader except DbDataReader)
// Release lock to prevent possible deadlocks
SqlInternalConnectionTds internalConnection = _connection.GetOpenTdsConnection();
bool semaphoreLock = internalConnection._parserLock.CanBeReleasedFromAnyThread;
internalConnection._parserLock.Release();

_hasMoreRowToCopy = false;
try
{
Expand All @@ -1175,6 +1180,10 @@ private Task ReadFromRowSourceAsync(CancellationToken cts)
throw;
}
}
finally
{
internalConnection._parserLock.Wait(canReleaseFromAnyThread: semaphoreLock);
}
return null;
}
}
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