[Qt] Use QThreadStorage for thread local

Portable.

2 files changed, 44 insertions, 1 deletions

diff --git a/platform/qt/qt.cmake b/platform/qt/qt.cmake
index b54bf88e8e..958300c6f9 100644
--- a/platform/qt/qt.cmake
+++ b/platform/qt/qt.cmake
@@ -33,7 +33,7 @@ set(MBGL_QT_FILES
     # Thread
     PRIVATE platform/default/mbgl/util/default_thread_pool.cpp
     PRIVATE platform/default/mbgl/util/default_thread_pool.cpp
-    PRIVATE platform/default/thread_local.cpp
+    PRIVATE platform/qt/src/thread_local.cpp
 
     # Platform integration
     PRIVATE platform/qt/src/async_task.cpp
diff --git a/platform/qt/src/thread_local.cpp b/platform/qt/src/thread_local.cpp
new file mode 100644
index 0000000000..ef61461c87
--- /dev/null
+++ b/platform/qt/src/thread_local.cpp
@@ -0,0 +1,43 @@
+#include <mbgl/style/class_dictionary.hpp>
+#include <mbgl/util/run_loop.hpp>
+#include <mbgl/util/thread_local.hpp>
+
+#include <array>
+
+#include <QThreadStorage>
+
+namespace mbgl {
+namespace util {
+
+template <class T>
+class ThreadLocal<T>::Impl {
+public:
+    QThreadStorage<std::array<T*, 1>> local;
+};
+
+template <class T>
+ThreadLocal<T>::ThreadLocal() : impl(std::make_unique<Impl>()) {
+    set(nullptr);
+}
+
+template <class T>
+ThreadLocal<T>::~ThreadLocal() {
+    delete get();
+}
+
+template <class T>
+T* ThreadLocal<T>::get() {
+    return impl->local.localData()[0];
+}
+
+template <class T>
+void ThreadLocal<T>::set(T* ptr) {
+   impl->local.localData()[0] = ptr;
+}
+
+template class ThreadLocal<RunLoop>;
+template class ThreadLocal<int>;
+template class ThreadLocal<style::ClassDictionary>;
+
+} // namespace util
+} // namespace mbgl