[android] Add support for timers on the main thread

Wake up the main thread run loop with a file descriptor event from a
thread that exists for this sole purpose.

1 files changed, 5 insertions, 0 deletions

diff --git a/platform/android/src/run_loop_impl.hpp b/platform/android/src/run_loop_impl.hpp
index cb553d1f8a..121a5127d1 100644
--- a/platform/android/src/run_loop_impl.hpp
+++ b/platform/android/src/run_loop_impl.hpp
@@ -5,6 +5,7 @@
 #include <mbgl/util/atomic.hpp>
 #include <mbgl/util/chrono.hpp>
 #include <mbgl/util/run_loop.hpp>
+#include <mbgl/util/thread.hpp>
 
 #include <list>
 #include <memory>
@@ -15,6 +16,8 @@ struct ALooper;
 namespace mbgl {
 namespace util {
 
+class Alarm;
+
 class RunLoop::Impl {
 public:
     class Runnable {
@@ -50,6 +53,8 @@ private:
     JNIEnv *env = nullptr;
     bool detach = false;
 
+    std::unique_ptr<Thread<Alarm>> alarm;
+
     std::recursive_mutex mtx;
     std::list<Runnable*> runnables;
     std::list<Runnable*>::iterator nextRunnable;