Rename lock_pool_t to lock_list

Also, replace reverse iteration with forward iteration.

lock_table_has(): Remove a redundant condition.

storage/innobase/include/lock0priv.ic

 /*****************************************************************************
 
 Copyright (c) 2007, 2014, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 2018, MariaDB Corporation.
 
 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
@@ -388,17 +389,10 @@ lock_table_has(
 	const dict_table_t*	table,	/*!< in: table */
 	lock_mode		in_mode)/*!< in: lock mode */
 {
-	if (trx->lock.table_locks.empty()) {
-		return(NULL);
-	}
-
-	typedef lock_pool_t::const_reverse_iterator iterator;
-
-	iterator	end = trx->lock.table_locks.rend();
-
 	/* Look for stronger locks the same trx already has on the table */
 
-	for (iterator it = trx->lock.table_locks.rbegin(); it != end; ++it) {
+	for (lock_list::const_iterator it = trx->lock.table_locks.begin(),
+             end = trx->lock.table_locks.end(); it != end; ++it) {
 
 		const lock_t*	lock = *it;
 

storage/innobase/include/trx0trx.h

@@ -642,7 +642,7 @@ The tranasction must be in the mysql_trx_list. */
 # define assert_trx_nonlocking_or_in_list(trx) ((void)0)
 #endif /* UNIV_DEBUG */
 
-typedef std::vector<ib_lock_t*, ut_allocator<ib_lock_t*> >	lock_pool_t;
+typedef std::vector<ib_lock_t*, ut_allocator<ib_lock_t*> >	lock_list;
 
 /*******************************************************************//**
 Latching protocol for trx_lock_t::que_state.  trx_lock_t::que_state
@@ -726,7 +726,7 @@ struct trx_lock_t {
 					and lock_sys->mutex; removals are
 					protected by lock_sys->mutex */
 
-	lock_pool_t	table_locks;	/*!< All table locks requested by this
+	lock_list	table_locks;	/*!< All table locks requested by this
 					transaction, including AUTOINC locks */
 
 	bool		cancel;		/*!< true if the transaction is being

storage/innobase/lock/lock0lock.cc

@@ -4493,24 +4493,15 @@ lock_trx_table_locks_remove(
 		ut_ad(trx_mutex_own(trx));
 	}
 
-	typedef lock_pool_t::reverse_iterator iterator;
-
-	iterator	end = trx->lock.table_locks.rend();
-
-	for (iterator it = trx->lock.table_locks.rbegin(); it != end; ++it) {
-
+	for (lock_list::iterator it = trx->lock.table_locks.begin(),
+             end = trx->lock.table_locks.end(); it != end; ++it) {
 		const lock_t*	lock = *it;
 
-		if (lock == NULL) {
-			continue;
-		}
-
-		ut_a(trx == lock->trx);
-		ut_a(lock_get_type_low(lock) & LOCK_TABLE);
-		ut_a(lock->un_member.tab_lock.table != NULL);
+		ut_ad(!lock || trx == lock->trx);
+		ut_ad(!lock || lock_get_type_low(lock) & LOCK_TABLE);
+		ut_ad(!lock || lock->un_member.tab_lock.table);
 
 		if (lock == lock_to_remove) {
-
 			*it = NULL;
 
 			if (!trx->lock.cancel) {
@@ -5370,11 +5361,8 @@ lock_trx_table_locks_find(
 
 	trx_mutex_enter(trx);
 
-	typedef lock_pool_t::const_reverse_iterator iterator;
-
-	iterator	end = trx->lock.table_locks.rend();
-
-	for (iterator it = trx->lock.table_locks.rbegin(); it != end; ++it) {
+	for (lock_list::const_iterator it = trx->lock.table_locks.begin(),
+             end = trx->lock.table_locks.end(); it != end; ++it) {
 
 		const lock_t*	lock = *it;
 
@@ -7108,10 +7096,8 @@ lock_trx_has_sys_table_locks(
 
 	lock_mutex_enter();
 
-	typedef lock_pool_t::const_reverse_iterator iterator;
-
-	iterator	end = trx->lock.table_locks.rend();
-	iterator	it = trx->lock.table_locks.rbegin();
+	const lock_list::const_iterator end = trx->lock.table_locks.end();
+	lock_list::const_iterator it = trx->lock.table_locks.begin();
 
 	/* Find a valid mode. Note: ib_vector_size() can be 0. */
 

storage/innobase/trx/trx0trx.cc

@@ -190,7 +190,7 @@ struct TrxFactory {
 		the constructors of the trx_t members. */
 		new(&trx->mod_tables) trx_mod_tables_t();
 
-		new(&trx->lock.table_locks) lock_pool_t();
+		new(&trx->lock.table_locks) lock_list();
 
 		trx_init(trx);
 
@@ -243,7 +243,7 @@ struct TrxFactory {
 
 		ut_ad(trx->read_view == NULL);
 
-		trx->lock.table_locks.~lock_pool_t();
+		trx->lock.table_locks.~lock_list();
 	}
 
 	/** Enforce any invariants here, this is called before the transaction