From 45af3585db0ae77defb53f6c827110b66f4c850f Mon Sep 17 00:00:00 2001
From: oliver Kowalke <oliver.kowalke@gmail.com>
Date: Fri, 8 Apr 2016 14:02:32 +0200
Subject: [PATCH] migrate context: scheduler must be different

---
 src/context.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/context.cpp b/src/context.cpp
index b33c0e70..bd9ff421 100644
--- a/src/context.cpp
+++ b/src/context.cpp
@@ -533,8 +533,10 @@ void
 context::migrate( context * ctx) noexcept {
     BOOST_ASSERT( nullptr != ctx);
     BOOST_ASSERT( context::active() != ctx);
-    ctx->scheduler_->detach_worker_context( ctx);
-    scheduler_->attach_worker_context( ctx);
+    if ( scheduler_ != ctx->scheduler_) {
+        ctx->scheduler_->detach_worker_context( ctx);
+        scheduler_->attach_worker_context( ctx);
+    }
 }
 
 }}