fix double start bug #1992 in browser as well

2 files changed, 36 insertions, 0 deletions

diff --git a/tests/doublestart.c b/tests/doublestart.c
new file mode 100644
index 00000000..533e6308
--- /dev/null
+++ b/tests/doublestart.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <emscripten.h>
+
+int times = 0;
+
+void later(void* nada) {
+  int result = times;
+  REPORT_RESULT();
+}
+
+void main_loop(void) {
+  static int cnt = 0;
+  if (++cnt >= 10) emscripten_cancel_main_loop();
+}
+
+int main(void) {
+  emscripten_async_call(later, NULL, 2000);
+  times++;
+  printf("This should only appear once.\n");
+  emscripten_set_main_loop(main_loop, 10, 0);
+  return 0;
+}
+
diff --git a/tests/test_browser.py b/tests/test_browser.py
index 23022604..eed18a3d 100644
--- a/tests/test_browser.py
+++ b/tests/test_browser.py
@@ -1751,3 +1751,16 @@ keydown(100);keyup(100); // trigger the end
     self.btest(path_from_root('tests', 'glew.c'), args=['-s', 'LEGACY_GL_EMULATION=1'], expected='1')
     self.btest(path_from_root('tests', 'glew.c'), args=['-DGLEW_MX'], expected='1')
     self.btest(path_from_root('tests', 'glew.c'), args=['-s', 'LEGACY_GL_EMULATION=1', '-DGLEW_MX'], expected='1')
+
+  def test_doublestart_bug(self):
+    open('pre.js', 'w').write(r'''
+if (typeof Module === 'undefined') Module = eval('(function() { try { return Module || {} } catch(e) { return {} } })()');
+if (!Module['preRun']) Module['preRun'] = [];
+Module["preRun"].push(function () {
+    Module['addRunDependency']('test_run_dependency');
+    Module['removeRunDependency']('test_run_dependency');
+});
+''')
+
+    self.btest('doublestart.c', args=['--pre-js', 'pre.js', '-o', 'test.html'], expected='1')
+