Initial commit

src/SignalHandler/SignalHandler.hpp

@@ -0,0 +1,63 @@
+#pragma once
+
+#include <src/Helpers/Thread.hpp>
+#include <src/EventManager/EventManager.hpp>
+#include "src/Helpers/SyncSafe.hpp"
+#include <csignal>
+
+namespace Bloom
+{
+    class SignalHandler: public Thread
+    {
+    private:
+        EventManager& eventManager;
+
+        /**
+         * Mapping of signal numbers to functions.
+         */
+        std::map<int, std::function<void()>> handlersMappedBySignalNum;
+
+        /**
+         * Fetches all signals currently of interest to the application.
+         *
+         * Currently this just returns a set of all signals (using sigfillset())
+         *
+         * @return
+         */
+        sigset_t getRegisteredSignalSet() const;
+
+        /**
+         * We keep record of the number of shutdown signals received. See definition of triggerApplicationShutdown()
+         * for more on this.
+         */
+        int shutdownSignalsReceived = 0;
+
+    public:
+        SignalHandler(EventManager& eventManager) : eventManager(eventManager) {};
+
+        /**
+         * Entry point for SignalHandler thread.
+         */
+        void run();
+
+        /**
+         * Initiates the SignalHandler thread.
+         */
+        void startup();
+
+        /**
+         * Triggers the shutdown of the SignalHandler thread.
+         */
+        void triggerShutdown() {
+            this->setState(ThreadState::SHUTDOWN_INITIATED);
+        };
+
+        /**
+         * Handler for SIGINT, SIGTERM, etc signals.
+         *
+         * Will trigger a ShutdownApplication event to kick-off a clean shutdown or it will terminate the
+         * program immediately if numerous SIGINT signals have been received.
+         */
+        void triggerApplicationShutdown();
+    };
+}