diff options
author | Anand Thakker <anandthakker@users.noreply.github.com> | 2018-07-03 17:17:39 -0400 |
---|---|---|
committer | GitHub <noreply@github.com> | 2018-07-03 17:17:39 -0400 |
commit | cfd436c287f4209d0d994042452ccbb552a6bd28 (patch) | |
tree | 6811590928d7ea19db8e8b3f9db8d1df54ba9965 /src/mbgl/sprite | |
parent | 840a5cf1207ed78df3302211a23d369dd3c12b89 (diff) | |
download | qtlocation-mapboxgl-cfd436c287f4209d0d994042452ccbb552a6bd28.tar.gz |
[core] Avoid blocking in Thread<Object> constructor (#12151)
* Introduce AspiringActor, EstablishedActor
This pair of objects represents the two-phase (parent-thread /
child-thread) construction that's needed to support constructing
Thread<Object> without blocking until the child thread is up and
running.
An `AspiringActor<O>` is responsible for:
- ownership of the actor's `Mailbox`
- allocating the memory for (but *not* constructing) the target object `O`
Using these two pieces--the mailbox and a stable address for `O`--an
`AspiringActor<O>` can accept messages for the target object, or provide
`ActorRef<O>`s that do so, before the object has actually been
constructed by the corresponding `EstablishedActor<O>`. (Such messages
are queued in the mailbox until after the object is constructed.)
This allows for an `AspiringActor<O>` to be created and safely used by a
thread other than the one on which the target object will (eventually)
live.
An `EstablishedActor<O>` is responsible for managing the lifetime of the
target object `O` and the open/closed state of the parent's `mailbox`.
The `O` object's lifetime is contained by that of its owning
`EstablishedActor<O>`: the `EstablishedActor` constructor executes the
`O` constructor via "placement new", constructing it at the address
provided by the parent `AspiringActor`, and the `~EstablishedActor`
destructor similarly executes the `~O` destructor (after closing the
mailbox). `EstablishedActor` should therefore live entirely on the
thread intended to own `O`.
* Remove Actor#{invoke,ask}
Diffstat (limited to 'src/mbgl/sprite')
-rw-r--r-- | src/mbgl/sprite/sprite_loader.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mbgl/sprite/sprite_loader.cpp b/src/mbgl/sprite/sprite_loader.cpp index 93d6dfd9ae..df4fe6e8df 100644 --- a/src/mbgl/sprite/sprite_loader.cpp +++ b/src/mbgl/sprite/sprite_loader.cpp @@ -86,7 +86,7 @@ void SpriteLoader::emitSpriteLoadedIfComplete() { return; } - loader->worker.invoke(&SpriteLoaderWorker::parse, loader->image, loader->json); + loader->worker.self().invoke(&SpriteLoaderWorker::parse, loader->image, loader->json); } void SpriteLoader::onParsed(std::vector<std::unique_ptr<style::Image>>&& result) { |