http: Avoid crash when g_thread_http was never started

g_thread_http can not be joined when it is not joinable. Avoid crashing
the node by adding the required check and add a test.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/httpserver.cpp b/src/httpserver.cpp
index ffe246b24..5e78fd1d7 100644
--- a/src/httpserver.cpp
+++ b/src/httpserver.cpp
@@ -421,7 +421,7 @@ bool UpdateHTTPServerLogging(bool enable) {
 #endif
 }
 
-static std::thread threadHTTP;
+static std::thread g_thread_http;
 static std::vector<std::thread> g_thread_http_workers;
 
 void StartHTTPServer()
@@ -429,7 +429,7 @@ void StartHTTPServer()
     LogPrint(BCLog::HTTP, "Starting HTTP server\n");
     int rpcThreads = std::max((long)gArgs.GetArg("-rpcthreads", DEFAULT_HTTP_THREADS), 1L);
     LogPrintf("HTTP: starting %d worker threads\n", rpcThreads);
-    threadHTTP = std::thread(ThreadHTTP, eventBase);
+    g_thread_http = std::thread(ThreadHTTP, eventBase);
 
     for (int i = 0; i < rpcThreads; i++) {
         g_thread_http_workers.emplace_back(HTTPWorkQueueRun, workQueue, i);
@@ -467,7 +467,7 @@ void StopHTTPServer()
     boundSockets.clear();
     if (eventBase) {
         LogPrint(BCLog::HTTP, "Waiting for HTTP event thread to exit\n");
-        threadHTTP.join();
+        if (g_thread_http.joinable()) g_thread_http.join();
     }
     if (eventHTTP) {
         evhttp_free(eventHTTP);