From ff1152e55dbfc9ddc9774386767406f6fdcc686a Mon Sep 17 00:00:00 2001
From: drltc <drltc@users.noreply.github.com>
Date: Tue, 9 Dec 2014 16:02:32 -0500
Subject: [PATCH] Add sync_call() for calling a functor in another thread and
 waiting on it

---
 include/fc/thread/thread.hpp | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/fc/thread/thread.hpp b/include/fc/thread/thread.hpp
index 040d877..bb82710 100644
--- a/include/fc/thread/thread.hpp
+++ b/include/fc/thread/thread.hpp
@@ -206,6 +206,22 @@ namespace fc {
       return fc::thread::current().schedule( fc::forward<Functor>(f), t, desc, prio );
    }
 
+  /**
+   * Call f() in thread t and block the current thread until it returns.
+   * 
+   * If t is null, simply execute f in the current thread.
+   */
+  template<typename Functor>
+  auto sync_call( thread* t, Functor&& f, const char* desc FC_TASK_NAME_DEFAULT_ARG, priority prio = priority()) -> decltype(f())
+  {
+     if( t == nullptr )
+         return f();
+
+     typedef decltype(f()) Result;
+     future<Result> r = t->async( f, desc, prio );
+     return r.wait();
+  }
+
 } // end namespace fc
 
 #ifdef _MSC_VER