add file preloading in browsers

1 files changed, 13 insertions, 0 deletions

diff --git a/src/preamble.js b/src/preamble.js
index afae5ea7..ae7bd660 100644
--- a/src/preamble.js
+++ b/src/preamble.js
@@ -873,5 +873,18 @@ var STRING_TABLE = [];
 {{{ unSign }}}
 {{{ reSign }}}
 
+// A counter of dependencies for calling run(). If we need to
+// do asynchronous work before running, increment this and
+// decrement it. Incrementing must happen in Module.preRun
+// or PRE_RUN_ADDITIONS (used by emcc to add file preloading).
+var runDependencies = 0;
+function addRunDependency() {
+  runDependencies++;
+}
+function removeRunDependency() {
+  runDependencies--;
+  if (runDependencies == 0) run();
+}
+
 // === Body ===