1 files changed, 48 insertions, 0 deletions
diff --git a/storage/innobase/include/os0sync.h b/storage/innobase/include/os0sync.h
index c6672aa73b6..32fd27960f3 100644
--- a/storage/innobase/include/os0sync.h
+++ b/storage/innobase/include/os0sync.h
@@ -416,6 +416,54 @@ clobbered */
 	"Mutexes and rw_locks use InnoDB's own implementation"
 #endif
 
+/** barrier definitions for memory ordering */
+#ifdef HAVE_IB_GCC_ATOMIC_THREAD_FENCE
+# define HAVE_MEMORY_BARRIER
+# define os_rmb	__atomic_thread_fence(__ATOMIC_ACQUIRE)
+# define os_wmb	__atomic_thread_fence(__ATOMIC_RELEASE)
+#ifdef __powerpc__
+# define os_isync  __asm __volatile ("isync":::"memory")
+#else
+#define os_isync do { } while(0)
+#endif
+
+# define IB_MEMORY_BARRIER_STARTUP_MSG \
+	"GCC builtin __atomic_thread_fence() is used for memory barrier"
+
+#elif defined(HAVE_IB_GCC_SYNC_SYNCHRONISE)
+# define HAVE_MEMORY_BARRIER
+# define os_rmb	__sync_synchronize()
+# define os_wmb	__sync_synchronize()
+# define os_isync __sync_synchronize()
+# define IB_MEMORY_BARRIER_STARTUP_MSG \
+	"GCC builtin __sync_synchronize() is used for memory barrier"
+
+#elif defined(HAVE_IB_MACHINE_BARRIER_SOLARIS)
+# define HAVE_MEMORY_BARRIER
+# include <mbarrier.h>
+# define os_rmb	__machine_r_barrier()
+# define os_wmb	__machine_w_barrier()
+# define os_isync os_rmb; os_wmb
+# define IB_MEMORY_BARRIER_STARTUP_MSG \
+	"Soralis memory ordering functions are used for memory barrier"
+
+#elif defined(HAVE_WINDOWS_MM_FENCE)
+# define HAVE_MEMORY_BARRIER
+# include <mmintrin.h>
+# define os_rmb	_mm_lfence()
+# define os_wmb	_mm_sfence()
+# define os_isync os_rmb; os_wmb
+# define IB_MEMORY_BARRIER_STARTUP_MSG \
+	"_mm_lfence() and _mm_sfence() are used for memory barrier"
+
+#else
+# define os_rmb do { } while(0)
+# define os_wmb do { } while(0)
+# define os_isync do { } while(0)
+# define IB_MEMORY_BARRIER_STARTUP_MSG \
+	"Memory barrier is not used"
+#endif
+
 #ifndef UNIV_NONINL
 #include "os0sync.ic"
 #endif