added connection pool and tests

test/orm/utils/auto_reset_event.cpp

@@ -0,0 +1,27 @@
+#include "auto_reset_event.hpp"
+
+namespace matador::test::utils {
+
+auto_reset_event::auto_reset_event() : state(false) {}
+
+void auto_reset_event::wait_one()
+{
+    std::unique_lock<std::mutex> lock(sync);
+    underlying.wait(lock, [this](){return state.load();});
+    state = false;
+}
+
+void auto_reset_event::set()
+{
+    std::unique_lock<std::mutex> lock(sync);
+    state = true;
+    underlying.notify_one();
+}
+
+void auto_reset_event::reset()
+{
+    std::unique_lock<std::mutex> lock(sync);
+    state = false;
+}
+
+}