Only send Tick messages to live threads (#1639)

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+### Fixed
+- Fixed infinite memory growth issue (#1639)
     
 ## [0.13.3] - 2020-09-18
 ### Added

src/ds/thread_messaging.h

@@ -301,27 +301,28 @@ namespace threading
       task.add_task_after(std::move(msg), ms);
     }
 
+    struct TickMsg
+    {
+      TickMsg(std::chrono::milliseconds elapsed_, Task& task_) :
+        elapsed(elapsed_),
+        task(task_)
+      {}
+
+      std::chrono::milliseconds elapsed;
+      Task& task;
+    };
+
+    static void tick_cb(std::unique_ptr<Tmsg<TickMsg>> msg)
+    {
+      msg->data.task.tick(msg->data.elapsed);
+    }
+
     void tick(std::chrono::milliseconds elapsed)
     {
-      struct TickMsg
+      for (auto i = 0; i < thread_count; ++i)
       {
-        TickMsg(std::chrono::milliseconds elapsed_, Task& task_) :
-          elapsed(elapsed_),
-          task(task_)
-        {}
-
-        std::chrono::milliseconds elapsed;
-        Task& task;
-      };
-
-      for (auto& task : tasks)
-      {
-        auto msg = std::make_unique<Tmsg<TickMsg>>(
-          [](std::unique_ptr<Tmsg<TickMsg>> msg) {
-            msg->data.task.tick(msg->data.elapsed);
-          },
-          elapsed,
-          task);
+        auto& task = tasks[i];
+        auto msg = std::make_unique<Tmsg<TickMsg>>(&tick_cb, elapsed, task);
         task.add_task(msg.release());
       }
     }