[BUG] Fixed init of the main thread

glvis.cpp

@@ -1019,6 +1019,10 @@ void PlayScript(istream &scr)
    script = &scr;
    stream_state.keys.clear();
 
+   // Make sure the singleton object returned by GetMainThread() is
+   // initialized from the main thread.
+   GetMainThread();
+
    std::thread worker_thread
    {
       [&](StreamState local_state)
@@ -1490,6 +1494,10 @@ int main (int argc, char *argv[])
    // check for saved stream file
    if (stream_file != string_none)
    {
+      // Make sure the singleton object returned by GetMainThread() is
+      // initialized from the main thread.
+      GetMainThread();
+
       Session stream_session(stream_state.fix_elem_orient,
                              stream_state.save_coloring);
 
@@ -1551,6 +1559,10 @@ int main (int argc, char *argv[])
    // server mode, read the mesh and the solution from a socket
    if (input == INPUT_SERVER_MODE)
    {
+      // Make sure the singleton object returned by GetMainThread() is
+      // initialized from the main thread.
+      GetMainThread();
+
       // Run server in new thread
       std::thread serverThread{GLVisServer, portnum, save_stream,
                                stream_state.fix_elem_orient,
@@ -1584,6 +1596,11 @@ int main (int argc, char *argv[])
          field_type = (use_soln) ? StreamState::FieldType::SCALAR
                       : StreamState::FieldType::MESH;
       }
+
+      // Make sure the singleton object returned by GetMainThread() is
+      // initialized from the main thread.
+      GetMainThread();
+
       Session single_session(field_type, std::move(stream_state));
       single_session.StartSession();
 

lib/sdl.hpp

@@ -37,6 +37,7 @@ typedef void (*Delegate)();
 typedef bool (*IdleDelegate)();
 
 class SdlMainThread;
+SdlMainThread& GetMainThread();
 
 class SdlWindow
 {