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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 6b115be..17c8e4d 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. */