X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=includes%2FSMP.h;h=49bc336f9985aed40972e3f07e6c20b3508b4f28;hb=dc01512f14cc4710d1f6a7448e642cd11e5e3efe;hp=5d74667f8631a8aa9641712f96c745dad11d52ab;hpb=aee6d6898bdb8294637df4aa0ef824b268c55a01;p=ghc-hetmet.git

diff --git a/includes/SMP.h b/includes/SMP.h
index 5d74667..49bc336 100644
--- a/includes/SMP.h
+++ b/includes/SMP.h
@@ -218,6 +218,17 @@ xchg(StgPtr p, StgWord w)
     return old;
 }
 
+STATIC_INLINE StgWord
+cas(StgVolatilePtr p, StgWord o, StgWord n)
+{
+    StgWord result;
+    result = *p;
+    if (result == o) {
+        *p = n;
+    }
+    return result;
+}
+
 #endif /* !THREADED_RTS */
 
 #endif /* SMP_H */