added connection pool and tests

test/orm/utils/auto_reset_event.hpp

@@ -0,0 +1,28 @@
+#ifndef QUERY_AUTO_RESET_EVENT_HPP
+#define QUERY_AUTO_RESET_EVENT_HPP
+
+#include <atomic>
+#include <condition_variable>
+#include <mutex>
+
+namespace matador::test::utils {
+
+class auto_reset_event
+{
+public:
+    auto_reset_event();
+    auto_reset_event(const auto_reset_event& other) = delete;
+
+    void wait_one();
+    void set();
+    void reset();
+
+private:
+    std::condition_variable underlying;
+    std::mutex sync;
+    std::atomic<bool> state;
+};
+
+}
+
+#endif //QUERY_AUTO_RESET_EVENT_HPP