Automatic merge from 5.5

Fixed 2 failing tests by replacing result files

VERSION

 MYSQL_VERSION_MAJOR=10
 MYSQL_VERSION_MINOR=0
 MYSQL_VERSION_PATCH=14
-MYSQL_VERSION_EXTRA=

include/my_cpu.h

+/* Copyright (c) 2013, MariaDB foundation Ab and SkySQL
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02111-1307  USA
+*/
+
+/* instructions for specific cpu's */
+
+/*
+  Macros for adjusting thread priority (hardware multi-threading)
+  The defines are the same ones used by the linux kernel
+*/
+
+#if defined(__powerpc__)
+/* Very low priority */
+#define HMT_very_low() asm volatile("or 31,31,31")
+/* Low priority */
+#define HMT_low() asm volatile("or 1,1,1")
+/* Medium low priority */
+#define HMT_medium_low() asm volatile("or 6,6,6")
+/* Medium priority */
+#define HMT_medium() asm volatile("or 2,2,2")
+/* Medium high priority */
+#define HMT_medium_high() asm volatile("or 5,5,5")
+/* High priority */
+#define HMT_high() asm volatile("or 3,3,3")
+#else
+#define HMT_very_low()
+#define HMT_low()
+#define HMT_medium_low()
+#define HMT_medium()
+#define HMT_medium_high()
+#define HMT_high()
+#endif

mysql-test/r/ctype_upgrade.result

@@ -227,7 +227,7 @@ DROP TABLE mysql050614_xxx_croatian_ci;
 # Checking mysql_upgrade
 #
 # Running mysql_upgrade
-Phase 1/3: Running 'mysql_fix_privilege_tables'...
+Phase 1/4: Checking mysql database
 Processing databases
 mysql
 mysql.column_stats                                 OK
@@ -258,8 +258,9 @@ mysql.time_zone_name                               OK
 mysql.time_zone_transition                         OK
 mysql.time_zone_transition_type                    OK
 mysql.user                                         OK
-Phase 2/3: Fixing table and database names
-Phase 3/3: Checking and upgrading tables
+Phase 2/4: Running 'mysql_fix_privilege_tables'...
+Phase 3/4: Fixing table and database names
+Phase 4/4: Checking and upgrading tables
 Processing databases
 information_schema
 mtr
@@ -281,7 +282,7 @@ test.maria100004_xxx_croatian_ci                   OK
 OK
 # Running mysql_upgrade for the second time
 # This should report OK for all tables
-Phase 1/3: Running 'mysql_fix_privilege_tables'...
+Phase 1/4: Checking mysql database
 Processing databases
 mysql
 mysql.column_stats                                 OK
@@ -312,8 +313,9 @@ mysql.time_zone_name                               OK
 mysql.time_zone_transition                         OK
 mysql.time_zone_transition_type                    OK
 mysql.user                                         OK
-Phase 2/3: Fixing table and database names
-Phase 3/3: Checking and upgrading tables
+Phase 2/4: Running 'mysql_fix_privilege_tables'...
+Phase 3/4: Fixing table and database names
+Phase 4/4: Checking and upgrading tables
 Processing databases
 information_schema
 mtr

mysql-test/r/log_tables_upgrade.result

@@ -11,7 +11,7 @@ Table	Op	Msg_type	Msg_text
 test.bug49823	repair	status	OK
 RENAME TABLE general_log TO renamed_general_log;
 RENAME TABLE test.bug49823 TO general_log;
-Phase 1/3: Running 'mysql_fix_privilege_tables'...
+Phase 1/4: Checking mysql database
 Processing databases
 mysql
 mysql.column_stats                                 OK
@@ -43,8 +43,9 @@ mysql.time_zone_name                               OK
 mysql.time_zone_transition                         OK
 mysql.time_zone_transition_type                    OK
 mysql.user                                         OK
-Phase 2/3: Fixing table and database names
-Phase 3/3: Checking and upgrading tables
+Phase 2/4: Running 'mysql_fix_privilege_tables'...
+Phase 3/4: Fixing table and database names
+Phase 4/4: Checking and upgrading tables
 Processing databases
 information_schema
 mtr

sql/CMakeLists.txt

@@ -32,13 +32,6 @@ SET_SOURCE_FILES_PROPERTIES(${GEN_SOURCES} PROPERTIES GENERATED 1)
 
 ADD_DEFINITIONS(-DMYSQL_SERVER -DHAVE_EVENT_SCHEDULER) 
 
-IF (CMAKE_SYSTEM_NAME MATCHES "Linux" OR
-    CMAKE_SYSTEM_NAME MATCHES "Windows" OR
-    CMAKE_SYSTEM_NAME MATCHES "SunOS" OR
-    HAVE_KQUEUE)
- ADD_DEFINITIONS(-DHAVE_POOL_OF_THREADS) 
-ENDIF()
-
 IF(SSL_DEFINES)
  ADD_DEFINITIONS(${SSL_DEFINES})
 ENDIF()
@@ -105,10 +98,16 @@ SET (SQL_SOURCE
                ${MYSYS_LIBWRAP_SOURCE}
 			   )
   
-IF(WIN32)
-  SET(SQL_SOURCE ${SQL_SOURCE} threadpool_win.cc)
-ELSE()
- SET(SQL_SOURCE ${SQL_SOURCE} threadpool_unix.cc)
+IF (CMAKE_SYSTEM_NAME MATCHES "Linux" OR
+    CMAKE_SYSTEM_NAME MATCHES "Windows" OR
+    CMAKE_SYSTEM_NAME MATCHES "SunOS" OR
+    HAVE_KQUEUE)
+ ADD_DEFINITIONS(-DHAVE_POOL_OF_THREADS) 
+ IF(WIN32)
+   SET(SQL_SOURCE ${SQL_SOURCE} threadpool_win.cc)
+ ELSE()
+   SET(SQL_SOURCE ${SQL_SOURCE} threadpool_unix.cc)
+ ENDIF()
 ENDIF()
 
 MYSQL_ADD_PLUGIN(partition ha_partition.cc STORAGE_ENGINE DEFAULT STATIC_ONLY

storage/innobase/CMakeLists.txt

@@ -123,6 +123,25 @@ IF(NOT CMAKE_CROSSCOMPILING)
   }"
   HAVE_IB_GCC_ATOMIC_BUILTINS_64
   )
+  CHECK_C_SOURCE_RUNS(
+  "#include<stdint.h>
+  int main()
+  {
+    __sync_synchronize();
+    return(0);
+  }"
+  HAVE_IB_GCC_SYNC_SYNCHRONISE
+  )
+  CHECK_C_SOURCE_RUNS(
+  "#include<stdint.h>
+  int main()
+  {
+    __atomic_thread_fence(__ATOMIC_ACQUIRE);
+    __atomic_thread_fence(__ATOMIC_RELEASE);
+    return(0);
+  }"
+  HAVE_IB_GCC_ATOMIC_THREAD_FENCE
+  )
 ENDIF()
 
 IF(HAVE_IB_GCC_ATOMIC_BUILTINS)
@@ -133,6 +152,14 @@ IF(HAVE_IB_GCC_ATOMIC_BUILTINS_64)
  ADD_DEFINITIONS(-DHAVE_IB_GCC_ATOMIC_BUILTINS_64=1)
 ENDIF()
 
+IF(HAVE_IB_GCC_SYNC_SYNCHRONISE)
+ ADD_DEFINITIONS(-DHAVE_IB_GCC_SYNC_SYNCHRONISE=1)
+ENDIF()
+
+IF(HAVE_IB_GCC_ATOMIC_THREAD_FENCE)
+ ADD_DEFINITIONS(-DHAVE_IB_GCC_ATOMIC_THREAD_FENCE=1)
+ENDIF()
+
  # either define HAVE_IB_ATOMIC_PTHREAD_T_GCC or not
 IF(NOT CMAKE_CROSSCOMPILING)
   CHECK_C_SOURCE_RUNS(
@@ -214,10 +241,21 @@ IF(CMAKE_SYSTEM_NAME STREQUAL "SunOS")
       return(0);
     }
   " HAVE_IB_ATOMIC_PTHREAD_T_SOLARIS)
+  CHECK_C_SOURCE_COMPILES(
+  "#include <mbarrier.h>
+  int main() {
+    __machine_r_barrier();
+    __machine_w_barrier();
+    return(0);
+  }"
+  HAVE_IB_MACHINE_BARRIER_SOLARIS)
   ENDIF()
   IF(HAVE_IB_ATOMIC_PTHREAD_T_SOLARIS)
     ADD_DEFINITIONS(-DHAVE_IB_ATOMIC_PTHREAD_T_SOLARIS=1)
   ENDIF()
+  IF(HAVE_IB_MACHINE_BARRIER_SOLARIS)
+    ADD_DEFINITIONS(-DHAVE_IB_MACHINE_BARRIER_SOLARIS=1)
+  ENDIF()
 ENDIF()
 
 
@@ -235,6 +273,7 @@ ENDIF()
 
 IF(MSVC)
   ADD_DEFINITIONS(-DHAVE_WINDOWS_ATOMICS)
+  ADD_DEFINITIONS(-DHAVE_WINDOWS_MM_FENCE)
 ENDIF()
 
 

storage/innobase/include/log0log.h

@@ -147,6 +147,13 @@ lsn_t
 log_get_lsn(void);
 /*=============*/
 /************************************************************//**
+Gets the current lsn.
+@return	current lsn */
+UNIV_INLINE
+lsn_t
+log_get_lsn_nowait(void);
+/*=============*/
+/************************************************************//**
 Gets the last lsn that is fully flushed to disk.
 @return	last flushed lsn */
 UNIV_INLINE

storage/innobase/include/log0log.ic

@@ -434,6 +434,26 @@ log_get_flush_lsn(void)
 	return(lsn);
 }
 
+/************************************************************//**
+Gets the current lsn with a trylock
+@return	current lsn or 0 if false*/
+UNIV_INLINE
+lsn_t
+log_get_lsn_nowait(void)
+/*=============*/
+{
+	lsn_t	lsn;
+
+        if (mutex_enter_nowait(&(log_sys->mutex)))
+          return 0;
+
+	lsn = log_sys->lsn;
+
+	mutex_exit(&(log_sys->mutex));
+
+	return(lsn);
+}
+
 /****************************************************************
 Gets the log group capacity. It is OK to read the value without
 holding log_sys->mutex because it is constant.

storage/innobase/include/os0sync.h

@@ -694,6 +694,54 @@ for synchronization */
 		os_decrement_counter_by_amount(mutex, counter, 1);\
 	} while (0);
 
+/** 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

storage/innobase/include/sync0rw.ic

@@ -199,14 +199,14 @@ rw_lock_lock_word_decr(
 	ulint		amount)		/*!< in: amount to decrement */
 {
 #ifdef INNODB_RW_LOCKS_USE_ATOMICS
-	lint local_lock_word = lock->lock_word;
-	while (local_lock_word > 0) {
+	lint local_lock_word;
+        os_rmb;
+	while ((local_lock_word= lock->lock_word) > 0) {
 		if (os_compare_and_swap_lint(&lock->lock_word,
 					     local_lock_word,
 					     local_lock_word - amount)) {
 			return(TRUE);
 		}
-		local_lock_word = lock->lock_word;
 	}
 	return(FALSE);
 #else /* INNODB_RW_LOCKS_USE_ATOMICS */

storage/innobase/include/sync0sync.ic

@@ -92,6 +92,7 @@ ib_mutex_test_and_set(
 		ut_a(mutex->lock_word == 0);
 
 		mutex->lock_word = 1;
+                os_wmb;
 	}
 
 	return((byte) ret);
@@ -144,6 +145,7 @@ mutex_get_waiters(
 
 	ptr = &(mutex->waiters);
 
+        os_rmb;
 	return(*ptr);		/* Here we assume that the read of a single
 				word from memory is atomic */
 }
@@ -178,6 +180,7 @@ mutex_exit_func(
 	to wake up possible hanging threads if
 	they are missed in mutex_signal_object. */
 
+        os_isync;
 	if (mutex_get_waiters(mutex) != 0) {
 
 		mutex_signal_object(mutex);

storage/innobase/srv/srv0srv.cc

@@ -356,7 +356,12 @@ UNIV_INTERN ibool	srv_use_posix_fallocate = TRUE;
 UNIV_INTERN ulong	srv_replication_delay		= 0;
 
 /*-------------------------------------------*/
+#ifdef HAVE_MEMORY_BARRIER
+/* No idea to wait long with memory barriers */
+UNIV_INTERN ulong	srv_n_spin_wait_rounds	= 15;
+#else
 UNIV_INTERN ulong	srv_n_spin_wait_rounds	= 30;
+#endif
 UNIV_INTERN ulong	srv_spin_wait_delay	= 6;
 UNIV_INTERN ibool	srv_priority_boost	= TRUE;
 
@@ -1709,9 +1714,10 @@ DECLARE_THREAD(srv_error_monitor_thread)(
 	/* Try to track a strange bug reported by Harald Fuchs and others,
 	where the lsn seems to decrease at times */
 
-	new_lsn = log_get_lsn();
+        /* We have to use nowait to ensure we don't block */
+	new_lsn= log_get_lsn_nowait();
 
-	if (new_lsn < old_lsn) {
+	if (new_lsn && new_lsn < old_lsn) {
 		ut_print_timestamp(stderr);
 		fprintf(stderr,
 			"  InnoDB: Error: old log sequence number " LSN_PF
@@ -1723,7 +1729,8 @@ DECLARE_THREAD(srv_error_monitor_thread)(
 		ut_ad(0);
 	}
 
-	old_lsn = new_lsn;
+        if (new_lsn)
+		old_lsn = new_lsn;
 
 	if (difftime(time(NULL), srv_last_monitor_time) > 60) {
 		/* We referesh InnoDB Monitor values so that averages are

storage/innobase/sync/sync0arr.cc

@@ -758,6 +758,7 @@ sync_arr_cell_can_wake_up(
 
 		lock = static_cast<rw_lock_t*>(cell->wait_object);
 
+                os_rmb;
 		if (lock->lock_word > 0) {
 		/* Either unlocked or only read locked. */
 
@@ -769,6 +770,7 @@ sync_arr_cell_can_wake_up(
 		lock = static_cast<rw_lock_t*>(cell->wait_object);
 
                 /* lock_word == 0 means all readers have left */
+                os_rmb;
 		if (lock->lock_word == 0) {
 
 			return(TRUE);
@@ -777,6 +779,7 @@ sync_arr_cell_can_wake_up(
 		lock = static_cast<rw_lock_t*>(cell->wait_object);
 
                 /* lock_word > 0 means no writer or reserved writer */
+                os_rmb;
 		if (lock->lock_word > 0) {
 
 			return(TRUE);

storage/innobase/sync/sync0rw.cc

@@ -41,6 +41,7 @@ Created 9/11/1995 Heikki Tuuri
 #include "srv0srv.h"
 #include "os0sync.h" /* for INNODB_RW_LOCKS_USE_ATOMICS */
 #include "ha_prototypes.h"
+#include "my_cpu.h"
 
 /*
 	IMPLEMENTATION OF THE RW_LOCK
@@ -375,15 +376,19 @@ rw_lock_s_lock_spin(
 lock_loop:
 
 	/* Spin waiting for the writer field to become free */
+	os_rmb;
+	HMT_low();
 	while (i < SYNC_SPIN_ROUNDS && lock->lock_word <= 0) {
 		if (srv_spin_wait_delay) {
 			ut_delay(ut_rnd_interval(0, srv_spin_wait_delay));
 		}
 
 		i++;
+		os_rmb;
 	}
 
-	if (i == SYNC_SPIN_ROUNDS) {
+	HMT_medium();
+	if (lock->lock_word <= 0) {
 		os_thread_yield();
 	}
 
@@ -472,14 +477,18 @@ rw_lock_x_lock_wait(
 
 	ut_ad(lock->lock_word <= 0);
 
+	os_rmb;
+        HMT_low();
 	while (lock->lock_word < 0) {
 		if (srv_spin_wait_delay) {
 			ut_delay(ut_rnd_interval(0, srv_spin_wait_delay));
 		}
 		if(i < SYNC_SPIN_ROUNDS) {
 			i++;
+			os_rmb;
 			continue;
 		}
+		HMT_medium();
 
 		/* If there is still a reader, then go to sleep.*/
 		rw_lock_stats.rw_x_spin_round_count.add(counter_index, i);
@@ -516,7 +525,9 @@ rw_lock_x_lock_wait(
 		} else {
 			sync_array_free_cell(sync_arr, index);
 		}
+		HMT_low();
 	}
+	HMT_medium();
 	rw_lock_stats.rw_x_spin_round_count.add(counter_index, i);
 }
 
@@ -553,7 +564,8 @@ rw_lock_x_lock_low(
 
 	} else {
 		os_thread_id_t	thread_id = os_thread_get_curr_id();
-
+		if (!pass)
+			os_rmb;
 		/* Decrement failed: relock or failed lock */
 		if (!pass && lock->recursive
 		    && os_thread_eq(lock->writer_thread, thread_id)) {
@@ -632,6 +644,8 @@ rw_lock_x_lock_func(
 		}
 
 		/* Spin waiting for the lock_word to become free */
+		os_rmb;
+		HMT_low();
 		while (i < SYNC_SPIN_ROUNDS
 		       && lock->lock_word <= 0) {
 			if (srv_spin_wait_delay) {
@@ -640,7 +654,9 @@ rw_lock_x_lock_func(
 			}
 
 			i++;
+			os_rmb;
 		}
+		HMT_medium();
 		if (i == SYNC_SPIN_ROUNDS) {
 			os_thread_yield();
 		} else {

storage/innobase/sync/sync0sync.cc

@@ -45,6 +45,7 @@ Created 9/5/1995 Heikki Tuuri
 # include "srv0start.h" /* srv_is_being_started */
 #endif /* UNIV_SYNC_DEBUG */
 #include "ha_prototypes.h"
+#include "my_cpu.h"
 
 /*
 	REASONS FOR IMPLEMENTING THE SPIN LOCK MUTEX
@@ -456,6 +457,8 @@ mutex_set_waiters(
 
 	ptr = &(mutex->waiters);
 
+        os_wmb;
+
 	*ptr = n;		/* Here we assume that the write of a single
 				word in memory is atomic */
 }
@@ -500,13 +503,15 @@ mutex_spin_wait(
 
 spin_loop:
 
+        HMT_low();
 	while (mutex_get_lock_word(mutex) != 0 && i < SYNC_SPIN_ROUNDS) {
 		if (srv_spin_wait_delay) {
 			ut_delay(ut_rnd_interval(0, srv_spin_wait_delay));
 		}
-
+                os_rmb;              // Ensure future reads sees new values
 		i++;
 	}
+        HMT_medium();
 
 	if (i == SYNC_SPIN_ROUNDS) {
 		os_thread_yield();

storage/tokudb/mysql-test/tokudb/t/i_s_tokudb_lock_waits_released.test

 # verify that information_schema.tokudb_locks gets populated with locks, information_schema.tokudb_lock_waits gets
-if (`select @@tokudb_version <= "7.1.6"`)
+if (`select @@tokudb_version <= "7.1.7"`)
 {
-  --skip Race condition in the test in TokuDB 7.1.6 or earlier
+  --skip Race condition in the test in TokuDB 7.1.7 or earlier
 }
 # populated with 1 lock_wait and all transactions are present in information_schema.tokudb_trx for 2 clients
 

storage/tokudb/mysql-test/tokudb/t/i_s_tokudb_locks_released.test

-if (`select @@tokudb_version <= "7.1.6"`)
+if (`select @@tokudb_version <= "7.1.7"`)
 {
-  --skip Race condition in the test in TokuDB 7.1.6 or earlier
+  --skip Race condition in the test in TokuDB 7.1.7 or earlier
 }
 # verify that information_schema.tokudb_locks gets populated with locks for 2 clients
 

storage/xtradb/CMakeLists.txt

@@ -129,6 +129,25 @@ IF(NOT CMAKE_CROSSCOMPILING)
   }"
   HAVE_IB_GCC_ATOMIC_BUILTINS_64
   )
+  CHECK_C_SOURCE_RUNS(
+  "#include<stdint.h>
+  int main()
+  {
+    __sync_synchronize();
+    return(0);
+  }"
+  HAVE_IB_GCC_SYNC_SYNCHRONISE
+  )
+  CHECK_C_SOURCE_RUNS(
+  "#include<stdint.h>
+  int main()
+  {
+    __atomic_thread_fence(__ATOMIC_ACQUIRE);
+    __atomic_thread_fence(__ATOMIC_RELEASE);
+    return(0);
+  }"
+  HAVE_IB_GCC_ATOMIC_THREAD_FENCE
+  )
 ENDIF()
 
 IF(HAVE_IB_GCC_ATOMIC_BUILTINS)
@@ -140,6 +159,14 @@ IF(HAVE_IB_GCC_ATOMIC_BUILTINS_64)
  ADD_DEFINITIONS(-DHAVE_IB_GCC_ATOMIC_BUILTINS_64=1)
 ENDIF()
 
+IF(HAVE_IB_GCC_SYNC_SYNCHRONISE)
+ ADD_DEFINITIONS(-DHAVE_IB_GCC_SYNC_SYNCHRONISE=1)
+ENDIF()
+
+IF(HAVE_IB_GCC_ATOMIC_THREAD_FENCE)
+ ADD_DEFINITIONS(-DHAVE_IB_GCC_ATOMIC_THREAD_FENCE=1)
+ENDIF()
+
  # either define HAVE_IB_ATOMIC_PTHREAD_T_GCC or not
 IF(NOT CMAKE_CROSSCOMPILING)
   CHECK_C_SOURCE_RUNS(
@@ -222,10 +249,21 @@ IF(CMAKE_SYSTEM_NAME STREQUAL "SunOS")
       return(0);
     }
   " HAVE_IB_ATOMIC_PTHREAD_T_SOLARIS)
+  CHECK_C_SOURCE_COMPILES(
+  "#include <mbarrier.h>
+  int main() {
+    __machine_r_barrier();
+    __machine_w_barrier();
+    return(0);
+  }"
+  HAVE_IB_MACHINE_BARRIER_SOLARIS)
   ENDIF()
   IF(HAVE_IB_ATOMIC_PTHREAD_T_SOLARIS)
     ADD_DEFINITIONS(-DHAVE_IB_ATOMIC_PTHREAD_T_SOLARIS=1)
   ENDIF()
+  IF(HAVE_IB_MACHINE_BARRIER_SOLARIS)
+    ADD_DEFINITIONS(-DHAVE_IB_MACHINE_BARRIER_SOLARIS=1)
+  ENDIF()
 ENDIF()
 
 
@@ -243,6 +281,7 @@ ENDIF()
 
 IF(MSVC)
   ADD_DEFINITIONS(-DHAVE_WINDOWS_ATOMICS)
+  ADD_DEFINITIONS(-DHAVE_WINDOWS_MM_FENCE)
   SET(XTRADB_OK 1)
 
   # Avoid "unreferenced label" warning in generated file

storage/xtradb/include/log0log.h

@@ -168,6 +168,13 @@ lsn_t
 log_get_lsn(void);
 /*=============*/
 /************************************************************//**
+Gets the current lsn.
+@return	current lsn */
+UNIV_INLINE
+lsn_t
+log_get_lsn_nowait(void);
+/*=============*/
+/************************************************************//**
 Gets the last lsn that is fully flushed to disk.
 @return	last flushed lsn */
 UNIV_INLINE

storage/xtradb/include/log0log.ic

@@ -486,6 +486,26 @@ log_get_flush_lsn(void)
 	return(lsn);
 }
 
+/************************************************************//**
+Gets the current lsn with a trylock
+@return	current lsn or 0 if false*/
+UNIV_INLINE
+lsn_t
+log_get_lsn_nowait(void)
+/*=============*/
+{
+	lsn_t	lsn;
+
+        if (mutex_enter_nowait(&(log_sys->mutex)))
+          return 0;
+
+	lsn = log_sys->lsn;
+
+	mutex_exit(&(log_sys->mutex));
+
+	return(lsn);
+}
+
 /****************************************************************
 Gets the log group capacity. It is OK to read the value without
 holding log_sys->mutex because it is constant.

storage/xtradb/include/os0sync.h

@@ -694,6 +694,54 @@ for synchronization */
 		os_decrement_counter_by_amount(mutex, counter, 1);\
 	} while (0);
 
+/** 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

storage/xtradb/include/sync0rw.ic

@@ -256,14 +256,14 @@ rw_lock_lock_word_decr(
 	ulint		amount)		/*!< in: amount to decrement */
 {
 #ifdef INNODB_RW_LOCKS_USE_ATOMICS
-	lint local_lock_word = lock->lock_word;
-	while (local_lock_word > 0) {
+	lint local_lock_word;
+        os_rmb;
+	while ((local_lock_word= lock->lock_word) > 0) {
 		if (os_compare_and_swap_lint(&lock->lock_word,
 					     local_lock_word,
 					     local_lock_word - amount)) {
 			return(TRUE);
 		}
-		local_lock_word = lock->lock_word;
 	}
 	return(FALSE);
 #else /* INNODB_RW_LOCKS_USE_ATOMICS */

storage/xtradb/include/sync0sync.ic

@@ -95,6 +95,7 @@ ib_mutex_test_and_set(
 		ut_a(mutex->lock_word == 0);
 
 		mutex->lock_word = 1;
+                os_wmb;
 	}
 
 	return((byte) ret);
@@ -147,6 +148,7 @@ mutex_get_waiters(
 
 	ptr = &(mutex->waiters);
 
+        os_rmb;
 	return(*ptr);		/* Here we assume that the read of a single
 				word from memory is atomic */
 }
@@ -181,6 +183,7 @@ mutex_exit_func(
 	to wake up possible hanging threads if
 	they are missed in mutex_signal_object. */
 
+        os_isync;
 	if (mutex_get_waiters(mutex) != 0) {
 
 		mutex_signal_object(mutex);

storage/xtradb/srv/srv0srv.cc

@@ -477,7 +477,12 @@ UNIV_INTERN ulong	srv_log_checksum_algorithm =
 	SRV_CHECKSUM_ALGORITHM_INNODB;
 
 /*-------------------------------------------*/
+#ifdef HAVE_MEMORY_BARRIER
+/* No idea to wait long with memory barriers */
+UNIV_INTERN ulong	srv_n_spin_wait_rounds	= 15;
+#else
 UNIV_INTERN ulong	srv_n_spin_wait_rounds	= 30;
+#endif
 UNIV_INTERN ulong	srv_spin_wait_delay	= 6;
 UNIV_INTERN ibool	srv_priority_boost	= TRUE;
 
@@ -2094,9 +2099,10 @@ DECLARE_THREAD(srv_error_monitor_thread)(
 	/* Try to track a strange bug reported by Harald Fuchs and others,
 	where the lsn seems to decrease at times */
 
-	new_lsn = log_get_lsn();
+        /* We have to use nowait to ensure we don't block */
+	new_lsn= log_get_lsn_nowait();
 
-	if (new_lsn < old_lsn) {
+	if (new_lsn && new_lsn < old_lsn) {
 		ut_print_timestamp(stderr);
 		fprintf(stderr,
 			"  InnoDB: Error: old log sequence number " LSN_PF
@@ -2108,7 +2114,8 @@ DECLARE_THREAD(srv_error_monitor_thread)(
 		ut_ad(0);
 	}
 
-	old_lsn = new_lsn;
+        if (new_lsn)
+		old_lsn = new_lsn;
 
 	if (difftime(time(NULL), srv_last_monitor_time) > 60) {
 		/* We referesh InnoDB Monitor values so that averages are

storage/xtradb/sync/sync0arr.cc

@@ -849,6 +849,7 @@ sync_arr_cell_can_wake_up(
 
 		lock = static_cast<rw_lock_t*>(cell->wait_object);
 
+                os_rmb;
 		if (lock->lock_word > 0) {
 		/* Either unlocked or only read locked. */
 
@@ -860,6 +861,7 @@ sync_arr_cell_can_wake_up(
 		lock = static_cast<rw_lock_t*>(cell->wait_object);
 
                 /* lock_word == 0 means all readers have left */
+                os_rmb;
 		if (lock->lock_word == 0) {
 
 			return(TRUE);
@@ -869,6 +871,7 @@ sync_arr_cell_can_wake_up(
 		lock = static_cast<rw_lock_t*>(cell->wait_object);
 
                 /* lock_word > 0 means no writer or reserved writer */
+                os_rmb;
 		if (lock->lock_word > 0) {
 
 			return(TRUE);

storage/xtradb/sync/sync0rw.cc

@@ -41,6 +41,7 @@ Created 9/11/1995 Heikki Tuuri
 #include "srv0srv.h"
 #include "os0sync.h" /* for INNODB_RW_LOCKS_USE_ATOMICS */
 #include "ha_prototypes.h"
+#include "my_cpu.h"
 
 /*
 	IMPLEMENTATION OF THE RW_LOCK
@@ -448,6 +449,8 @@ rw_lock_s_lock_spin(
 					       lock)) {
 
 		/* Spin waiting for the writer field to become free */
+		os_rmb;
+		HMT_low();
 		while (i < SYNC_SPIN_ROUNDS && lock->lock_word <= 0) {
 			if (srv_spin_wait_delay) {
 				ut_delay(ut_rnd_interval(0,
@@ -455,9 +458,11 @@ rw_lock_s_lock_spin(
 			}
 
 			i++;
+			os_rmb;
 		}
 
-		if (i == SYNC_SPIN_ROUNDS) {
+		HMT_medium();
+		if (lock->lock_word <= 0) {
 			os_thread_yield();
 		}
 
@@ -605,14 +610,18 @@ rw_lock_x_lock_wait(
 
 	ut_ad(lock->lock_word <= 0);
 
+	os_rmb;
+        HMT_low();
 	while (lock->lock_word < 0) {
 		if (srv_spin_wait_delay) {
 			ut_delay(ut_rnd_interval(0, srv_spin_wait_delay));
 		}
 		if(i < SYNC_SPIN_ROUNDS) {
 			i++;
+			os_rmb;
 			continue;
 		}
+		HMT_medium();
 
 		/* If there is still a reader, then go to sleep.*/
 		rw_lock_stats.rw_x_spin_round_count.add(counter_index, i);
@@ -660,7 +669,9 @@ rw_lock_x_lock_wait(
 				prio_rw_lock->high_priority_wait_ex_waiter = 0;
 			}
 		}
+		HMT_low();
 	}
+	HMT_medium();
 	rw_lock_stats.rw_x_spin_round_count.add(counter_index, i);
 }
 
@@ -701,7 +712,8 @@ rw_lock_x_lock_low(
 
 	} else {
 		os_thread_id_t	thread_id = os_thread_get_curr_id();
-
+		if (!pass)
+			os_rmb;
 		/* Decrement failed: relock or failed lock */
 		if (!pass && lock->recursive
 		    && os_thread_eq(lock->writer_thread, thread_id)) {
@@ -792,6 +804,8 @@ rw_lock_x_lock_func(
 		}
 
 		/* Spin waiting for the lock_word to become free */
+		os_rmb;
+		HMT_low();
 		while (i < SYNC_SPIN_ROUNDS
 		       && lock->lock_word <= 0) {
 			if (srv_spin_wait_delay) {
@@ -800,7 +814,9 @@ rw_lock_x_lock_func(
 			}
 
 			i++;
+			os_rmb;
 		}
+		HMT_medium();
 		if (i == SYNC_SPIN_ROUNDS) {
 			os_thread_yield();
 		} else {

storage/xtradb/sync/sync0sync.cc

@@ -46,6 +46,7 @@ Created 9/5/1995 Heikki Tuuri
 # include "srv0start.h" /* srv_is_being_started */
 #endif /* UNIV_SYNC_DEBUG */
 #include "ha_prototypes.h"
+#include "my_cpu.h"
 
 /*
 	REASONS FOR IMPLEMENTING THE SPIN LOCK MUTEX
@@ -535,6 +536,8 @@ mutex_set_waiters(
 
 	ptr = &(mutex->waiters);
 
+        os_wmb;
+
 	*ptr = n;		/* Here we assume that the write of a single
 				word in memory is atomic */
 }
@@ -587,13 +590,15 @@ mutex_spin_wait(
 
 spin_loop:
 
+        HMT_low();
 	while (mutex_get_lock_word(mutex) != 0 && i < SYNC_SPIN_ROUNDS) {
 		if (srv_spin_wait_delay) {
 			ut_delay(ut_rnd_interval(0, srv_spin_wait_delay));
 		}
-
+                os_rmb;              // Ensure future reads sees new values
 		i++;
 	}
+        HMT_medium();
 
 	if (i == SYNC_SPIN_ROUNDS) {
 		os_thread_yield();