Update CPU statistics on a dedicated thread.

telegram-bot-api/ClientParameters.h

@@ -93,9 +93,14 @@ struct SharedData {
     return 10;
   }
 
-  static td::int32 get_thread_count() {
+  static td::int32 get_statistics_thread_id() {
+    // the thread for CPU usage updating
     return 11;
   }
+
+  static td::int32 get_thread_count() {
+    return 12;
+  }
 };
 
 struct ClientParameters {

telegram-bot-api/telegram-bot-api.cpp

@@ -556,7 +556,9 @@ int main(int argc, char *argv[]) {
         next_cron_time = now;
       }
       next_cron_time += 1.0;
-      ServerCpuStat::update(now);
+      auto guard = sched.get_main_guard();
+      td::Scheduler::instance()->run_on_scheduler(SharedData::get_statistics_thread_id(),
+                                                  [](td::Unit) { ServerCpuStat::update(td::Time::now()); });
     }
 
     if (now >= start_time + 600) {