[core] Make the BackgroundScheduler a singleton

- Do not carry it over everywhere as parameter, it is a shared
  instance anyway and the lifecycle is pretty much the app lifecycle
  from the moment we instantiate a map.
- Rename to BackgroundScheduler because it is a Scheduler that will
  do tasks in the background, we don't make assumptions if it is a
  thread pool or a single thread.
- Most importantly, remove the dependency from `core` on `platform`.

1 files changed, 3 insertions, 4 deletions

diff --git a/platform/glfw/main.cpp b/platform/glfw/main.cpp
index 4e631ec895..04cff3962a 100644
--- a/platform/glfw/main.cpp
+++ b/platform/glfw/main.cpp
@@ -5,7 +5,6 @@
 #include <mbgl/util/default_styles.hpp>
 #include <mbgl/util/logging.hpp>
 #include <mbgl/util/platform.hpp>
-#include <mbgl/util/default_thread_pool.hpp>
 #include <mbgl/util/string.hpp>
 #include <mbgl/storage/default_file_source.hpp>
 #include <mbgl/style/style.hpp>
@@ -109,10 +108,9 @@ int main(int argc, char *argv[]) {
         mbgl::Log::Warning(mbgl::Event::Setup, "Application is offline. Press `O` to toggle online status.");
     }
 
-    mbgl::ThreadPool threadPool(4);
-    GLFWRendererFrontend rendererFrontend { std::make_unique<mbgl::Renderer>(view->getRendererBackend(), view->getPixelRatio(), threadPool), *view };
+    GLFWRendererFrontend rendererFrontend { std::make_unique<mbgl::Renderer>(view->getRendererBackend(), view->getPixelRatio()), *view };
 
-    mbgl::Map map(rendererFrontend, *view, threadPool,
+    mbgl::Map map(rendererFrontend, *view,
                   mbgl::MapOptions().withSize(view->getSize()).withPixelRatio(view->getPixelRatio()), resourceOptions);
 
     backend.setMap(&map);
@@ -199,5 +197,6 @@ int main(int argc, char *argv[]) {
                     settings.latitude, settings.longitude, settings.zoom, settings.bearing);
 
     view = nullptr;
+
     return 0;
 }