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Fixed potential deadlock in FbConnectionPoolManager #1076

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Fixed potential deadlock in FbConnectionPoolManager #1076

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27 changes: 21 additions & 6 deletions src/FirebirdSql.Data.FirebirdClient/FirebirdClient/FbConnectionPoolManager.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -65,13 +65,19 @@ public Pool(ConnectionString connectionString)

public void Dispose()
{
Item[] items;

lock (_syncRoot)
{
if (_disposed)
return;
_disposed = true;
CleanConnectionsImpl();

items = _available.ToArray();
_available.Clear();
}

CleanConnectionsImpl(items);
}

public FbConnectionInternal GetConnection(out bool createdNew)
Expand Down Expand Up @@ -103,6 +109,8 @@ public void ReleaseConnection(FbConnectionInternal connection, bool returnToAvai

public void PrunePool()
{
List<Item> release;

lock (_syncRoot)
{
CheckDisposedImpl();
Expand All @@ -117,26 +125,33 @@ public void PrunePool()
{
keep = keep.Concat(available.Except(keep).OrderByDescending(x => x.Created).Take(_connectionString.MinPoolSize - keepCount)).ToList();
}
var release = available.Except(keep).ToList();
Parallel.ForEach(release, x => x.Release());
release = available.Except(keep).ToList();
_available = new Stack<Item>(keep);
}

// Call Release() outside the lock to avoid potential deadlocks
Parallel.ForEach(release, x => x.Release());
}

public void ClearPool()
{
Item[] items;

lock (_syncRoot)
{
CheckDisposedImpl();

CleanConnectionsImpl();
items = _available.ToArray();
_available.Clear();
}

// Call Release() outside the lock to avoid potential deadlocks
CleanConnectionsImpl(items);
}

void CleanConnectionsImpl()
void CleanConnectionsImpl(Item[] items)
{
Parallel.ForEach(_available, x => x.Release());
Parallel.ForEach(items, x => x.Release());
}

[MethodImpl(MethodImplOptions.AggressiveInlining)]
Expand Down