From c32208cbe22a451c7d5a07e730cdaaf5af4ea0ff Mon Sep 17 00:00:00 2001
From: Martin Cerveny <M.Cerveny@computer.org>
Date: Thu, 24 Jan 2013 18:23:41 +0100
Subject: [PATCH] implements EBUSY on Resource.request()

---
 tos/system/SimpleArbiterP.nc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tos/system/SimpleArbiterP.nc b/tos/system/SimpleArbiterP.nc
index 05c7dcec8e..bf7eb4aa26 100644
--- a/tos/system/SimpleArbiterP.nc
+++ b/tos/system/SimpleArbiterP.nc
@@ -76,7 +76,8 @@ implementation {
         post grantedTask();
         return SUCCESS;
       }
-      return call Queue.enqueue(id);
+      if ((state == RES_GRANTING) && (resId == id)) return EBUSY;
+      else return call Queue.enqueue(id);
     }
   }