Method dispatchToEventLoop

src/JobQueue.cc:96–112

static PyMethodDef callDispatchFuncDef = {"JsDispatchCallable", callDispatchFunc, METH_NOARGS, NULL};

bool JobQueue::dispatchToEventLoop(void *closure, JS::Dispatchable *dispatchable) {
  JSContext *cx = (JSContext *)closure;

  // The `dispatchToEventLoop` function is running in a helper thread, so
  // we must acquire the Python GIL (global interpreter lock)
  //    see https://docs.python.org/3/c-api/init.html#non-python-created-threads
  PyGILState_STATE gstate = PyGILState_Ensure();

  PyObject *dispatchFuncTuple = PyTuple_Pack(2, PyLong_FromVoidPtr(cx), PyLong_FromVoidPtr(dispatchable));
  PyObject *pyFunc = PyCFunction_New(&callDispatchFuncDef, dispatchFuncTuple);

  // Avoid using the current, JS helper thread to send jobs to event-loop as it may cause deadlock
  PyThread_start_new_thread((void (*)(void *)) &sendJobToMainLoop, pyFunc);

  PyGILState_Release(gstate);
  return true;
}

bool sendJobToMainLoop(PyObject *pyFunc) {
  PyGILState_STATE gstate = PyGILState_Ensure();