Update thread-private work count when epoll operations are not complete.

asio/include/asio/detail/impl/epoll_reactor.ipp

@@ -635,7 +635,7 @@ struct epoll_reactor::perform_io_cleanup_on_block_exit
       // No user-initiated operations have completed, so we need to compensate
       // for the work_finished() call that the scheduler will make once this
       // operation returns.
-      reactor_->scheduler_.work_started();
+      reactor_->scheduler_.compensating_work_started();
     }
   }
 

asio/include/asio/detail/impl/scheduler.ipp

@@ -243,6 +243,12 @@ void scheduler::restart()
   stopped_ = false;
 }
 
+void scheduler::compensating_work_started()
+{
+  thread_info_base* this_thread = thread_call_stack::contains(this);
+  ++static_cast<thread_info*>(this_thread)->private_outstanding_work;
+}
+
 void scheduler::post_immediate_completion(
     scheduler::operation* op, bool is_continuation)
 {

asio/include/asio/detail/scheduler.hpp

@@ -79,6 +79,10 @@ public:
     ++outstanding_work_;
   }
 
+  // Used to compensate for a forthcoming work_finished call. Must be called
+  // from within a scheduler-owned thread.
+  ASIO_DECL void compensating_work_started();
+
   // Notify that some work has finished.
   void work_finished()
   {