warn in SDL_CreateThread about the problem with SDL threads

1 files changed, 4 insertions, 0 deletions

diff --git a/src/library_sdl.js b/src/library_sdl.js
index 56f6a6ef..4cb4ca6f 100644
--- a/src/library_sdl.js
+++ b/src/library_sdl.js
@@ -1547,6 +1547,10 @@ var LibrarySDL = {
   SDL_RemoveTimer: function(id) {
     window.clearTimeout(id);
     return true;
+  },
+
+  SDL_CreateThread: function() {
+    throw 'SDL threads cannot be supported in the web platform because they assume shared state. See emscripten_create_worker etc. for a message-passing concurrency model that does let you run code in another thread.'
   }
 };