Always initialize trx_t::start_time_micro

This affects the function has_higher_priority() for internal or
recovered transactions.

storage/innobase/include/trx0trx.h

@@ -867,10 +867,11 @@ struct trx_t{
 					when trx->in_rw_trx_list. Initially
 					set to TRX_ID_MAX. */
 
-	time_t		start_time;	/*!< time the trx state last time became
-					TRX_STATE_ACTIVE */
-	ib_uint64_t	start_time_micro;	/*!< start time of transaction in
-					microseconds */
+	/** wall-clock time of the latest transition to TRX_STATE_ACTIVE;
+	used for diagnostic purposes only */
+	time_t		start_time;
+	/** microsecond_interval_timer() of transaction start */
+	ulonglong	start_time_micro;
 	trx_id_t	id;		/*!< transaction id */
 	XID		xid;		/*!< X/Open XA transaction
 					identification to identify a

storage/innobase/lock/lock0lock.cc

@@ -2279,10 +2279,7 @@ If neither of them is wait lock, the first one has higher priority.
 If only one of them is a wait lock, it has lower priority.
 Otherwise, the one with an older transaction has higher priority.
 @returns true if lock1 has higher priority, false otherwise. */
-bool
-has_higher_priority(
-	lock_t *lock1,
-	lock_t *lock2)
+static bool has_higher_priority(lock_t *lock1, lock_t *lock2)
 {
 	if (lock1 == NULL) {
 		return false;

storage/innobase/trx/trx0purge.cc

@@ -146,7 +146,8 @@ trx_purge_sys_create(
 	here only because the query threads code requires it. It is otherwise
 	quite unnecessary. We should get rid of it eventually. */
 	purge_sys->trx->id = 0;
-	purge_sys->trx->start_time = ut_time();
+	purge_sys->trx->start_time = time(NULL);
+	purge_sys->trx->start_time_micro = microsecond_interval_timer();
 	purge_sys->trx->state = TRX_STATE_ACTIVE;
 	purge_sys->trx->op_info = "purge trx";
 

storage/innobase/trx/trx0trx.cc

@@ -570,7 +570,8 @@ trx_resurrect_insert(
 	/* trx_start_low() is not called with resurrect, so need to initialize
 	start time here.*/
 	if (trx->state != TRX_STATE_COMMITTED_IN_MEMORY) {
-		trx->start_time = ut_time();
+		trx->start_time = time(NULL);
+		trx->start_time_micro = microsecond_interval_timer();
 	}
 
 	if (undo->dict_operation) {
@@ -656,7 +657,8 @@ trx_resurrect_update(
 	start time here.*/
 	if (trx->state == TRX_STATE_ACTIVE
 	    || trx->state == TRX_STATE_PREPARED) {
-		trx->start_time = ut_time();
+		trx->start_time = time(NULL);
+		trx->start_time_micro = microsecond_interval_timer();
 	}
 
 	if (undo->dict_operation) {
@@ -907,8 +909,9 @@ trx_start_low(
 
 	trx->start_time = ut_time();
 
-	trx->start_time_micro =
-		trx->mysql_thd ? thd_query_start_micro(trx->mysql_thd) : 0;
+	trx->start_time_micro = trx->mysql_thd
+		? thd_query_start_micro(trx->mysql_thd)
+		: microsecond_interval_timer();
 
 	MONITOR_INC(MONITOR_TRX_ACTIVE);
 }

storage/xtradb/include/trx0trx.h

@@ -917,10 +917,11 @@ struct trx_t{
 					when trx->in_rw_trx_list. Initially
 					set to TRX_ID_MAX. */
 
-	time_t		start_time;	/*!< time the trx state last time became
-					TRX_STATE_ACTIVE */
-	ib_uint64_t	start_time_micro;	/*!< start time of transaction in
-					microseconds */
+	/** wall-clock time of the latest transition to TRX_STATE_ACTIVE;
+	used for diagnostic purposes only */
+	time_t		start_time;
+	/** microsecond_interval_timer() of transaction start */
+	ulonglong	start_time_micro;
 	trx_id_t	id;		/*!< transaction id */
 	XID		xid;		/*!< X/Open XA transaction
 					identification to identify a

storage/xtradb/lock/lock0lock.cc

@@ -2077,10 +2077,7 @@ If neither of them is wait lock, the first one has higher priority.
 If only one of them is a wait lock, it has lower priority.
 Otherwise, the one with an older transaction has higher priority.
 @returns true if lock1 has higher priority, false otherwise. */
-bool
-has_higher_priority(
-	lock_t *lock1,
-	lock_t *lock2)
+static bool has_higher_priority(lock_t *lock1, lock_t *lock2)
 {
 	if (lock1 == NULL) {
 		return false;

storage/xtradb/trx/trx0purge.cc

@@ -146,7 +146,8 @@ trx_purge_sys_create(
 	here only because the query threads code requires it. It is otherwise
 	quite unnecessary. We should get rid of it eventually. */
 	purge_sys->trx->id = 0;
-	purge_sys->trx->start_time = ut_time();
+	purge_sys->trx->start_time = time(NULL);
+	purge_sys->trx->start_time_micro = microsecond_interval_timer();
 	purge_sys->trx->state = TRX_STATE_ACTIVE;
 	purge_sys->trx->op_info = "purge trx";
 

storage/xtradb/trx/trx0trx.cc

@@ -749,7 +749,8 @@ trx_resurrect_insert(
 	/* trx_start_low() is not called with resurrect, so need to initialize
 	start time here.*/
 	if (trx->state != TRX_STATE_COMMITTED_IN_MEMORY) {
-		trx->start_time = ut_time();
+		trx->start_time = time(NULL);
+		trx->start_time_micro = microsecond_interval_timer();
 	}
 
 	if (undo->dict_operation) {
@@ -835,7 +836,8 @@ trx_resurrect_update(
 	start time here.*/
 	if (trx->state == TRX_STATE_ACTIVE
 	    || trx->state == TRX_STATE_PREPARED) {
-		trx->start_time = ut_time();
+		trx->start_time = time(NULL);
+		trx->start_time_micro = microsecond_interval_timer();
 	}
 
 	if (undo->dict_operation) {
@@ -1106,8 +1108,9 @@ trx_start_low(
 
 	trx->start_time = ut_time();
 
-	trx->start_time_micro =
-		trx->mysql_thd ? thd_query_start_micro(trx->mysql_thd) : 0;
+	trx->start_time_micro = trx->mysql_thd
+		? thd_query_start_micro(trx->mysql_thd)
+		: microsecond_interval_timer();
 
 	MONITOR_INC(MONITOR_TRX_ACTIVE);
 }