Tweak CDKGSessionHandler::StartThread()

Author: UdjinM6

src/llmq/quorums_dkgsessionhandler.cpp

@@ -138,6 +138,10 @@ void CDKGSessionHandler::ProcessMessage(CNode* pfrom, const std::string& strComm
 
 void CDKGSessionHandler::StartThread()
 {
+    if (phaseHandlerThread.joinable()) {
+        throw std::runtime_error("Tried to start an already started CDKGSessionHandler thread.");
+    }
+
     auto threadName = [&]() -> auto {
         switch (params.type) {
             case Consensus::LLMQ_50_60:
@@ -150,8 +154,10 @@ void CDKGSessionHandler::StartThread()
                 return "q-phase-100";
             case Consensus::LLMQ_DEVNET:
                 return "q-phase-101";
-            default:
+            case Consensus::LLMQ_NONE:
                 throw std::runtime_error("Tried to start a CDKGSessionHandler thread for LLMQ_NONE.");
+            default:
+                throw std::runtime_error("Tried to start a CDKGSessionHandler thread for an unknown LLMQ type.");
         }
     };
     phaseHandlerThread = std::thread(&TraceThread<std::function<void()> >, threadName(), std::function<void()>(std::bind(&CDKGSessionHandler::PhaseHandlerThread, this)));