Add Adapter::inject_sync_shutdown() to be used if _adapter_manages_sync_thread

src/Adapter.cc

@@ -201,13 +201,19 @@ namespace pEp {
             return _session.get();
         }
 
+        // public
+        void inject_sync_shutdown() {
+            pEpLog("called");
+            _inject_sync_event(nullptr, nullptr);
+        }
+
         // public
         void shutdown()
         {
             pEpLog("called");
             if (_sync_thread.joinable()) {
                 pEpLog("sync_is_running - injecting null event");
-                _inject_sync_event(nullptr, nullptr);
+                inject_sync_shutdown();
                 _sync_thread.join();
             }
         }

src/Adapter.hh

@@ -77,6 +77,11 @@ namespace pEp {
 
         extern thread_local Session session;
 
+        // only injects a NULL event into sync_event_queue
+        // Use this if adapter_manages_sync_thread
+        // Inject first, then join your thread.
+        void inject_sync_shutdown();
+
         // injects a NULL event into sync_event_queue to denote sync thread to
         // shutdown, and joins & removes the sync thread
         void shutdown();