137513 2014-10-08 00:28:16 -0700 [GLib] Add a simple GMainLoopSource variant 2014-10-09 08:48:06 -0700 1 1 1 Unclassified WebKit WebKit Misc. 528+ (Nightly build) Unspecified Unspecified NEW P2 Normal --- 1 zan webkit-unassigned cgarcia gustavo mrobinson oldest_to_newest 1040227 0 zan 2014-10-08 00:28:16 -0700 Add a simpler GMainLoopSource implementation that creates only one GSource during its lifetime. That GSource then has its ready time updated as required in order for the dispatch to occur. 1040228 1 239460 zan 2014-10-08 00:34:34 -0700 Created attachment 239460 WIP This is a work-in-progress, showing the basic idea. Adds the GMainLoopSource::Simple class which can for now only handle void callbacks. The source has its ready time updated only when a new dispatch is scheduled. The source remains attached to the context throughout its lifetime (which equates the lifetime of the GMainLoopSource::Simple object). The shared timer and layer flush timer in LayerTreeHostGtk are converted to using GMainLoopSource::Simple as an example. 1040236 2 239460 cgarcia 2014-10-08 01:37:58 -0700 Comment on attachment 239460 WIP View in context: https://bugs.webkit.org/attachment.cgi?id=239460&action=review This is independent of the split in any case, we would still need cancellables and mutexes for thread safe sources, and we don't need that for sources used by the same thread. Instead of creating a new class, we could create a new GSource that is created on demand when scheduled is called for a non repeating source with no destroy func, for example. > Source/WTF/wtf/gobject/GMainLoopSource.cpp:475 > + g_source_set_ready_time(m_source.get(), g_get_monotonic_time() + delay.count() * 1000); My main concern of this approach is that it works because the current glib implementation allows it, but it hasn't been thought to be used this way, I think > Source/WTF/wtf/gobject/GMainLoopSource.cpp:502 > + [](GSource*, GSourceFunc callback, gpointer userData) -> gboolean > + { > + return callback(userData); > + }, This will not work for repeating sources that will be marked as destroyed if they return Stop. I think you could call set_ready_time here, and return G_SOURCE_CONTINUE unconditionally here as well to make it clear this source will not be destroyed. > Source/WebCore/platform/gtk/SharedTimerGtk.cpp:36 > +static void (*sharedTimerFiredFunction)() = nullptr; I don't think you need to initialize global static vars to 0. 1040513 3 zan 2014-10-09 01:39:39 -0700 (In reply to comment #2) > > Source/WTF/wtf/gobject/GMainLoopSource.cpp:475 > > + g_source_set_ready_time(m_source.get(), g_get_monotonic_time() + delay.count() * 1000); > > My main concern of this approach is that it works because the current glib implementation allows it, but it hasn't been thought to be used this way, I think It's essentially a timeout source with a dynamic interval that's updated on demand. But whatever the case, we can ask about it with GLib developers on their mailing list. 1040519 4 239526 cgarcia 2014-10-09 04:01:59 -0700 Created attachment 239526 Same optimization on top of patch to split GMainLoopSource This is how I would apply your optimization on top of the split. 1040553 5 239460 cgarcia 2014-10-09 08:48:06 -0700 Comment on attachment 239460 WIP I'm more and more convinced about this approach of a separate class, however, I would not make a subclass, but a different class with a different name. Since in the end it's quite different to GMainLoopSource (it's restricted to non repeating timeout sources, without destroy functions, non thread safe, etc.). It could be something like GPersistentSource, for example. And instead of schedule, I would use fire, for example, and isPending(). 239460 2014-10-08 00:34:34 -0700 2014-10-09 08:48:06 -0700 WIP gms.patch text/plain 7831 zan SW5kZXg6IFNvdXJjZS9XVEYvd3RmL2dvYmplY3QvR01haW5Mb29wU291cmNlLmNwcAo9PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09Ci0tLSBTb3VyY2UvV1RGL3d0Zi9nb2JqZWN0L0dNYWluTG9vcFNvdXJjZS5jcHAJKHJldmlz aW9uIDE3NDQxOSkKKysrIFNvdXJjZS9XVEYvd3RmL2dvYmplY3QvR01haW5Mb29wU291cmNlLmNw cAkod29ya2luZyBjb3B5KQpAQCAtNDQ1LDYgKzQ0NSw3NyBAQAogICAgICAgICBkZXN0cm95Q2Fs bGJhY2soKTsKIH0KIAorR01haW5Mb29wU291cmNlOjpTaW1wbGU6OlNpbXBsZShjb25zdCBjaGFy KiBuYW1lLCBpbnQgcHJpb3JpdHkpCisgICAgOiBtX3NvdXJjZShnX3NvdXJjZV9uZXcoJm1fc291 cmNlRnVuY3Rpb25zLCBzaXplb2YoR1NvdXJjZSkpKQorICAgICwgbV9mdW5jdGlvbihudWxscHRy KQorICAgICwgbV9zdGF0dXMoUmVhZHkpCit7CisgICAgZ19zb3VyY2Vfc2V0X25hbWUobV9zb3Vy Y2UuZ2V0KCksIG5hbWUpOworICAgIGdfc291cmNlX3NldF9jYWxsYmFjayhtX3NvdXJjZS5nZXQo 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