Index: src/libcfa/concurrency/kernel
===================================================================
--- src/libcfa/concurrency/kernel	(revision 2ac095d3d4c65b28ce001600da53f6e19c8d0ec1)
+++ src/libcfa/concurrency/kernel	(revision b227f6896f9a2f0cc65768eef401bb62ec7dc754)
@@ -28,7 +28,8 @@
 //-----------------------------------------------------------------------------
 // Locks
-bool try_lock( spinlock * DEBUG_CTX_PARAM2 );
-void lock    ( spinlock * DEBUG_CTX_PARAM2 );
-void unlock  ( spinlock * );
+bool try_lock  ( spinlock * DEBUG_CTX_PARAM2 );
+void lock      ( spinlock * DEBUG_CTX_PARAM2 );
+void lock_yield( spinlock * DEBUG_CTX_PARAM2 );
+void unlock    ( spinlock * );
 
 struct signal_once {