Win32 UI loop: allow recursion

src/xenia/ui/loop_win.cc

@@ -57,7 +57,7 @@ void Win32Loop::ThreadMain() {
     DispatchMessage(&msg);
 
     // Process queued functions.
-    std::lock_guard<std::mutex> lock(posted_functions_mutex_);
+    std::lock_guard<std::recursive_mutex> lock(posted_functions_mutex_);
     for (auto it = posted_functions_.begin(); it != posted_functions_.end();) {
       (*it).Call();
       it = posted_functions_.erase(it);
@@ -75,7 +75,7 @@ bool Win32Loop::is_on_loop_thread() {
 void Win32Loop::Post(std::function<void()> fn) {
   assert_true(thread_id_ != 0);
   {
-    std::lock_guard<std::mutex> lock(posted_functions_mutex_);
+    std::lock_guard<std::recursive_mutex> lock(posted_functions_mutex_);
     PostedFn posted_fn(fn);
     posted_functions_.push_back(posted_fn);
   }

src/xenia/ui/loop_win.h

@@ -64,7 +64,7 @@ class Win32Loop : public Loop {
   std::mutex pending_timers_mutex_;
   std::list<PendingTimer*> pending_timers_;
 
-  std::mutex posted_functions_mutex_;
+  std::recursive_mutex posted_functions_mutex_;
   std::list<PostedFn> posted_functions_;
 };