glib主事件循环

研究qemu事件派发机制，没想到牵扯到了glib，没办法分析一下吧

qemu里面的glib主事件循环的api大概有如下几个

    ctx = (AioContext *) g_source_new(&aio_source_funcs, sizeof(AioContext));
    g_source_set_can_recurse(&ctx->source, true);
    g_source_destroy(&ctx->source);
    g_source_set_name(src, "aio-context");
    g_source_attach(src, NULL);
    g_source_unref(src);

来看下glib主事件是如何处理的吧

GSource *
g_source_new (GSourceFuncs *source_funcs,
	      guint         struct_size)
{
  GSource *source;

  g_return_val_if_fail (source_funcs != NULL, NULL);
  g_return_val_if_fail (struct_size >= sizeof (GSource), NULL);
  
  source = (GSource*) g_malloc0 (struct_size);
  source->priv = g_slice_new0 (GSourcePrivate);
  sour