[core] Retain thread pool in GeoJSONSource

Otherwise, the construction of the `Immutable<Source::Impl>` in background thread might never yeld.

1 files changed, 2 insertions, 1 deletions

diff --git a/include/mbgl/style/sources/geojson_source.hpp b/include/mbgl/style/sources/geojson_source.hpp
index 9569b61df4..df2f9d2daf 100644
--- a/include/mbgl/style/sources/geojson_source.hpp
+++ b/include/mbgl/style/sources/geojson_source.hpp
@@ -14,7 +14,7 @@
 namespace mbgl {
 
 class AsyncRequest;
-
+class Scheduler;
 namespace style {
 
 struct GeoJSONOptions {
@@ -81,6 +81,7 @@ public:
 private:
     optional<std::string> url;
     std::unique_ptr<AsyncRequest> req;
+    std::shared_ptr<Scheduler> threadPool;
     mapbox::base::WeakPtrFactory<Source> weakFactory {this};
 };