GLibMainContextpusher_new

Push main_context as the new thread-default main context for the current thread, using g_main_context_push_thread_default(), and return a new GMainContextPusher. Pop with g_main_context_pusher_free(). Using g_main_context_pop_thread_default() on main_context while a GMainContextPusher exists for it can lead to undefined behaviour.

Using two GMainContextPushers in the same scope is not allowed, as it leads to an undefined pop order.

This is intended to be used with g_autoptr(). Note that g_autoptr() is only available when using GCC or clang, so the following example will only work with those compilers:

typedef struct
{
  ...
  GMainContext *context;
  ...
} MyObject;

static void
my_object_do_stuff (MyObject *self)
{
  g_autoptr(GMainContextPusher) pusher = g_main_context_pusher_new (self->context);

  // Code with main context as the thread default here

  if (cond)
    // No need to pop
    return;

  // Optionally early pop
  g_clear_pointer (&pusher, g_main_context_pusher_free);

  // Code with main context no longer the thread default here
}

Available since: 2.64