X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=rts%2Fsm%2FMarkWeak.h;h=2647a22eec8b9735adc5a6f790d77408d6bf915f;hb=b0ec2cb2ab74b21ea1f790c062cd213aa9d9ef02;hp=7b3a806857c6a5f9ed064eb2151fab1427d290d4;hpb=e7987f16175f88daa11f06f25d10161a95f84bc4;p=ghc-hetmet.git

diff --git a/rts/sm/MarkWeak.h b/rts/sm/MarkWeak.h
index 7b3a806..2647a22 100644
--- a/rts/sm/MarkWeak.h
+++ b/rts/sm/MarkWeak.h
@@ -11,6 +11,9 @@
  *
  * ---------------------------------------------------------------------------*/
 
+#ifndef SM_MARKWEAK_H
+#define SM_MARKWEAK_H
+
 extern StgWeak *old_weak_ptr_list;
 extern StgTSO *resurrected_threads;
 extern StgTSO *exception_threads;
@@ -19,3 +22,5 @@ void    initWeakForGC          ( void );
 rtsBool traverseWeakPtrList    ( void );
 void    markWeakPtrList        ( void );
 rtsBool traverseBlackholeQueue ( void );
+
+#endif /* SM_MARKWEAK_H */