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-rw-r--r--linuxthreads/internals.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/linuxthreads/internals.h b/linuxthreads/internals.h
index 8cb9b6837c..3984512e4d 100644
--- a/linuxthreads/internals.h
+++ b/linuxthreads/internals.h
@@ -357,6 +357,13 @@ static inline pthread_descr thread_self (void)
 #endif
 }
 
+/* If MEMORY_BARRIER isn't defined in pt-machine.h, assume the architecture
+   doesn't need a memory barrier instruction (e.g. Intel x86) */
+
+#ifndef MEMORY_BARRIER
+#define 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. */