--- Percona-Server-5.1.59/sql/set_var.cc	2011-10-16 22:16:06.000000000 +0800
+++ Percona-Server-5.1.59-debug/sql/set_var.cc	2011-12-23 14:47:13.000000000 +0800
@@ -754,7 +754,14 @@
                                                SYSTEM_TYPE);
 static sys_var_thd_ulong	sys_net_wait_timeout(&vars, "wait_timeout",
 					     &SV::net_wait_timeout);
-
+/* Add For Kill Idle Transaction By P.Linux*/
+static sys_var_thd_ulong	sys_trx_idle_timeout(&vars, "trx_idle_timeout",
+					     &SV::trx_idle_timeout);
+static sys_var_thd_ulong	sys_trx_readonly_idle_timeout(&vars, "trx_readonly_idle_timeout",
+					     &SV::trx_readonly_idle_timeout);
+static sys_var_thd_ulong	sys_trx_changes_idle_timeout(&vars, "trx_changes_idle_timeout",
+					     &SV::trx_changes_idle_timeout);
+/* End */
 /* Condition pushdown to storage engine */
 static sys_var_thd_bool
 sys_engine_condition_pushdown(&vars, "engine_condition_pushdown",
--- Percona-Server-5.1.59/sql/sql_class.h	2011-10-16 22:16:06.000000000 +0800
+++ Percona-Server-5.1.59-debug/sql/sql_class.h	2011-12-23 19:14:48.000000000 +0800
@@ -325,6 +325,11 @@
   ulong net_read_timeout;
   ulong net_retry_count;
   ulong net_wait_timeout;
+  /* Add For Kill Idle Transaction By P.Linux */
+  ulong trx_idle_timeout;
+  ulong trx_readonly_idle_timeout;
+  ulong trx_changes_idle_timeout;
+  /* End */
   ulong net_write_timeout;
   ulong optimizer_prune_level;
   ulong optimizer_search_depth;
@@ -1488,6 +1493,9 @@
 
   uint       last_errno;
 
+  /* Add For Kill Idle Transaction By P.Linux */
+  bool       is_readonly_trx; // This Thread is in a readonly Transaction?
+  /* End */
   /* <> 0 if we are inside of trigger or stored function. */
   uint in_sub_stmt;
   /* TRUE when the current top has SQL_LOG_BIN ON */
--- Percona-Server-5.1.59/sql/sql_class.cc	2011-10-16 22:16:05.000000000 +0800
+++ Percona-Server-5.1.59-debug/sql/sql_class.cc	2011-12-23 19:05:54.000000000 +0800
@@ -707,6 +707,9 @@
 #ifdef ERROR_INJECT_SUPPORT
   error_inject_value= 0UL;
 #endif
+  /* Add For Kill Idle Transaction By P.Linux */
+  is_readonly_trx = TRUE;
+  /* End */
   // Must be reset to handle error with THD's created for init of mysqld
   lex->current_select= 0;
   start_time=(time_t) 0;
--- Percona-Server-5.1.59/sql/sql_parse.cc	2011-10-16 22:16:06.000000000 +0800
+++ Percona-Server-5.1.59-debug/sql/sql_parse.cc	2011-12-23 20:17:42.000000000 +0800
@@ -143,6 +143,7 @@
   thd->options&= ~(ulong) OPTION_BEGIN;
   thd->transaction.all.modified_non_trans_table= FALSE;
   thd->server_status&= ~SERVER_STATUS_IN_TRANS;
+  thd->is_readonly_trx = TRUE;
   xid_cache_delete(&thd->transaction.xid_state);
   thd->transaction.xid_state.xa_state= XA_NOTR;
 
@@ -183,6 +184,7 @@
     if (!thd->locked_tables)
       thd->options&= ~OPTION_TABLE_LOCK;
     thd->server_status&= ~SERVER_STATUS_IN_TRANS;
+	thd->is_readonly_trx = TRUE;
     if (ha_commit(thd))
       error=1;
   }
@@ -212,6 +214,7 @@
   {
     thd->options|= OPTION_BEGIN;
     thd->server_status|= SERVER_STATUS_IN_TRANS;
+	thd->is_readonly_trx = TRUE;
   }
   return error;
 }
@@ -754,6 +757,7 @@
      (Which of course should never happen...)
     */
     thd->server_status&= ~SERVER_STATUS_IN_TRANS;
+	thd->is_readonly_trx = TRUE;
     res= ha_commit(thd);
     thd->options&= ~(OPTION_BEGIN | OPTION_KEEP_LOG);
     thd->transaction.all.modified_non_trans_table= FALSE;
@@ -771,6 +775,7 @@
   case ROLLBACK_AND_CHAIN:
   {
     thd->server_status&= ~SERVER_STATUS_IN_TRANS;
+	thd->is_readonly_trx = TRUE;
     if (ha_rollback(thd))
       res= -1;
     thd->options&= ~(OPTION_BEGIN | OPTION_KEEP_LOG);
@@ -828,8 +833,25 @@
     the client, the connection is closed or "net_wait_timeout"
     number of seconds has passed
   */
-  my_net_set_read_timeout(net, thd->variables.net_wait_timeout);
-
+  /* Add For Kill Idle Transaction By P.Linux */
+  if (thd->active_transaction()) 
+  {
+	if (thd->variables.trx_idle_timeout > 0) 
+	{
+	  my_net_set_read_timeout(net, thd->variables.trx_idle_timeout);
+	} else if (thd->variables.trx_readonly_idle_timeout > 0 && thd->is_readonly_trx) 
+	{
+	  my_net_set_read_timeout(net, thd->variables.trx_readonly_idle_timeout);
+	} else if (thd->variables.trx_changes_idle_timeout > 0 && !thd->is_readonly_trx)
+	{
+	  my_net_set_read_timeout(net, thd->variables.trx_changes_idle_timeout);
+	} else {
+	  my_net_set_read_timeout(net, thd->variables.net_wait_timeout);
+	}
+  } else {
+    my_net_set_read_timeout(net, thd->variables.net_wait_timeout);
+  }
+  /* End */
   /*
     XXX: this code is here only to clear possible errors of init_connect. 
     Consider moving to init_connect() instead.
@@ -2350,7 +2372,21 @@
   status_var_increment(thd->status_var.com_stat[lex->sql_command]);
 
   DBUG_ASSERT(thd->transaction.stmt.modified_non_trans_table == FALSE);
-  
+ 
+  /* Add For Kill Idle Transaction By P.Linux */
+  switch (lex->sql_command) {
+	  case SQLCOM_DELETE_MULTI:
+	  case SQLCOM_UPDATE_MULTI:
+	  case SQLCOM_UPDATE:
+	  case SQLCOM_INSERT: 
+	  case SQLCOM_INSERT_SELECT:
+	  case SQLCOM_DELETE:
+	  case SQLCOM_REPLACE:
+	  case SQLCOM_REPLACE_SELECT:
+		  thd->is_readonly_trx = FALSE;
+		  break;
+  }
+  /* End */
   switch (lex->sql_command) {
 
   case SQLCOM_SHOW_EVENTS:
@@ -4965,6 +5001,7 @@
     thd->transaction.all.modified_non_trans_table= FALSE;
     thd->options= ((thd->options & ~(OPTION_KEEP_LOG)) | OPTION_BEGIN);
     thd->server_status|= SERVER_STATUS_IN_TRANS;
+	thd->is_readonly_trx = TRUE;
     my_ok(thd);
     break;
   case SQLCOM_XA_END:
@@ -5082,6 +5119,7 @@
     thd->options&= ~(OPTION_BEGIN | OPTION_KEEP_LOG);
     thd->transaction.all.modified_non_trans_table= FALSE;
     thd->server_status&= ~SERVER_STATUS_IN_TRANS;
+	thd->is_readonly_trx = TRUE;
     xid_cache_delete(&thd->transaction.xid_state);
     thd->transaction.xid_state.xa_state=XA_NOTR;
     break;