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-rw-r--r--includes/Cmm.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/includes/Cmm.h b/includes/Cmm.h
index 1505b1cb6a..ca8e51af78 100644
--- a/includes/Cmm.h
+++ b/includes/Cmm.h
@@ -1,6 +1,6 @@
/* -----------------------------------------------------------------------------
*
- * (c) The University of Glasgow 2004-2012
+ * (c) The University of Glasgow 2004-2013
*
* This file is included at the top of all .cmm source files (and
* *only* .cmm files). It defines a collection of useful macros for
@@ -583,6 +583,12 @@
#define OVERWRITING_CLOSURE(c) /* nothing */
#endif
+#ifdef THREADED_RTS
+#define prim_write_barrier prim %write_barrier()
+#else
+#define prim_write_barrier /* nothing */
+#endif
+
/* -----------------------------------------------------------------------------
Ticky macros
-------------------------------------------------------------------------- */