refactor runtime initialization

1 files changed, 5 insertions, 1 deletions

diff --git a/src/preamble.js b/src/preamble.js
index e7778b30..f85cf4f3 100644
--- a/src/preamble.js
+++ b/src/preamble.js
@@ -718,7 +718,11 @@ var __ATINIT__ = []; // functions called during startup
 var __ATMAIN__ = []; // functions called when main() is to be run
 var __ATEXIT__ = []; // functions called during shutdown
 
-function initRuntime() {
+var runtimeInitialized = false;
+
+function ensureInitRuntime() {
+  if (runtimeInitialized) return;
+  runtimeInitialized = true;
   callRuntimeCallbacks(__ATINIT__);
 }
 function preMain() {