From b8548fd14708c53fa6d58fb8c1e78e1ac657a809 Mon Sep 17 00:00:00 2001
From: Oliver Kowalke <oliver.kowalke@gmx.de>
Date: Sun, 15 Dec 2013 17:44:22 +0100
Subject: [PATCH] main context call scheduler::instance()->run() in yield()

---
 include/boost/fiber/operations.hpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/boost/fiber/operations.hpp b/include/boost/fiber/operations.hpp
index b59ce6fa..7f036890 100644
--- a/include/boost/fiber/operations.hpp
+++ b/include/boost/fiber/operations.hpp
@@ -32,7 +32,12 @@ fibers::fiber::id get_id() BOOST_NOEXCEPT
 
 inline
 void yield()
-{ fibers::detail::scheduler::instance()->yield(); }
+{
+    if ( fibers::detail::scheduler::instance()->active() )
+        fibers::detail::scheduler::instance()->yield();
+    else
+        fibers::detail::scheduler::instance()->run();
+}
 
 inline
 void sleep_until( fibers::clock_type::time_point const& sleep_time)