--- /dev/null
+#ifndef SecDbInternal_h
+#define SecDbInternal_h
+
+#include "SecDb.h"
+
+static const size_t kSecDbMaxReaders = 5;
+
+// Do not increase this without changing lock types in SecDb
+static const size_t kSecDbMaxWriters = 1;
+
+// maxreaders + maxwriters
+static const size_t kSecDbMaxIdleHandles = 6;
+
+#endif /* SecDbInternal_h */