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-rw-r--r--linuxthreads/internals.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/linuxthreads/internals.h b/linuxthreads/internals.h
index 6b115beaa2..17c8e4d4d6 100644
--- a/linuxthreads/internals.h
+++ b/linuxthreads/internals.h
@@ -358,11 +358,15 @@ static inline pthread_descr thread_self (void)
 }
 
 /* If MEMORY_BARRIER isn't defined in pt-machine.h, assume the architecture
-   doesn't need a memory barrier instruction (e.g. Intel x86) */
+   doesn't need a memory barrier instruction (e.g. Intel x86).  Some
+   architectures distinguish between normal/read and write barriers.  */
 
 #ifndef MEMORY_BARRIER
 #define MEMORY_BARRIER()
 #endif
+#ifndef WRITE_MEMORY_BARRIER
+#define WRITE_MEMORY_BARRIER() MEMORY_BARRIER()
+#endif
 
 /* Max number of times we must spin on a spinlock calling sched_yield().
    After MAX_SPIN_COUNT iterations, we put the calling thread to sleep. */