Add compiler barriers to read-side for mutex ordering

[urcu.git] / urcu-static.h

diff --git a/urcu-static.h b/urcu-static.h
index dce15b7122cad8c3c44c3d7881cf97b81c92fb3e..eea39bb0641f8b5d295a46dd4f316761a6e85d21 100644 (file)
--- a/urcu-static.h
+++ b/urcu-static.h
@@ -259,6 +259,7 @@ static inline void _rcu_read_lock(void)
 {
        unsigned long tmp;
 
+       barrier();      /* Ensure the compiler does not reorder us with mutex */
        tmp = rcu_reader.ctr;
        /*
         * rcu_gp_ctr is
@@ -294,6 +295,7 @@ static inline void _rcu_read_unlock(void)
        } else {
                _STORE_SHARED(rcu_reader.ctr, rcu_reader.ctr - RCU_GP_COUNT);
        }
+       barrier();      /* Ensure the compiler does not reorder us with mutex */
 }
 
 #ifdef __cplusplus