[core] Isolate pthread-based tls implementation

1 files changed, 62 insertions, 0 deletions

diff --git a/platform/default/thread_local.cpp b/platform/default/thread_local.cpp
new file mode 100644
index 0000000000..b754a04b7d
--- /dev/null
+++ b/platform/default/thread_local.cpp
@@ -0,0 +1,62 @@
+#include <mbgl/util/thread_local.hpp>
+
+#include <mbgl/map/backend_scope.hpp>
+#include <mbgl/util/logging.hpp>
+#include <mbgl/util/run_loop.hpp>
+
+#include <stdexcept>
+#include <cassert>
+
+#include <pthread.h>
+
+namespace mbgl {
+namespace util {
+
+template <class T>
+class ThreadLocal<T>::Impl {
+public:
+    pthread_key_t key;
+};
+
+template <class T>
+ThreadLocal<T>::ThreadLocal() : impl(std::make_unique<Impl>()) {
+    int ret = pthread_key_create(&impl->key, [](void *) {});
+
+    if (ret) {
+        throw std::runtime_error("Failed to init local storage key.");
+    }
+}
+
+template <class T>
+ThreadLocal<T>::~ThreadLocal() {
+    delete get();
+
+    if (pthread_key_delete(impl->key)) {
+        Log::Error(Event::General, "Failed to delete local storage key.");
+        assert(false);
+    }
+}
+
+template <class T>
+T* ThreadLocal<T>::get() {
+    auto* ret = reinterpret_cast<T*>(pthread_getspecific(impl->key));
+    if (!ret) {
+        return nullptr;
+    }
+
+    return ret;
+}
+
+template <class T>
+void ThreadLocal<T>::set(T* ptr) {
+    if (pthread_setspecific(impl->key, ptr)) {
+        throw std::runtime_error("Failed to set local storage.");
+    }
+}
+
+template class ThreadLocal<RunLoop>;
+template class ThreadLocal<BackendScope>;
+template class ThreadLocal<int>; // For unit tests
+
+} // namespace util
+} // namespace mbgl