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Bug#21554 (sp_cache.cc: violates C++ aliasing rules)

Browse Source 
The problem reported is a compile bug,
reported by the development GCC team with GCC 4.2.

The original issue can no longer be reproduced in MySQL 5.1,
since the configure script no longer define HAVE_ATOMIC_ADD,
which caused the Linux atomic functions to be used (and cause a problem
with an invalid cast).

This patch implements some code cleanup for 5.1 only, which was identified
during the investigation of this issue.

With this patch, statistics maintained in THD::status_var are by definition
owned by the running thread, and do not need to be protected against race
conditions. These statistics are maintained by the status_var_* helpers,
which do not require any lock.
This commit is contained in:
malff/marcsql@weblab.(none)
2007-05-22 13:41:40 -06:00
parent 43894d62f1
commit 782096dbcc
8 changed files with 87 additions and 84 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
sql/sql_parse.cc
View File

@ -721,8 +721,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
case COM_INIT_DB:
{
LEX_STRING tmp;
statistic_increment(thd->status_var.com_stat[SQLCOM_CHANGE_DB],
&LOCK_status);
status_var_increment(thd->status_var.com_stat[SQLCOM_CHANGE_DB]);
thd->convert_string(&tmp, system_charset_info,
packet, packet_length-1, thd->charset());
if (!mysql_change_db(thd, &tmp, FALSE))
@ -757,7 +756,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
break;
}
statistic_increment(thd->status_var.com_other, &LOCK_status);
status_var_increment(thd->status_var.com_other);
thd->enable_slow_log= opt_log_slow_admin_statements;
db.str= thd->alloc(db_len + tbl_len + 2);
db.length= db_len;
@ -773,7 +772,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
}
case COM_CHANGE_USER:
{
statistic_increment(thd->status_var.com_other, &LOCK_status);
status_var_increment(thd->status_var.com_other);
char *user= (char*) packet, *packet_end= packet+ packet_length;
char *passwd= strend(user)+1;
@ -956,8 +955,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
/* used as fields initializator */
lex_start(thd);
statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_FIELDS],
&LOCK_status);
status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_FIELDS]);
bzero((char*) &table_list,sizeof(table_list));
if (thd->copy_db_to(&table_list.db, &dummy))
break;
@ -1023,8 +1021,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
LEX_STRING db, alias;
HA_CREATE_INFO create_info;
statistic_increment(thd->status_var.com_stat[SQLCOM_CREATE_DB],
&LOCK_status);
status_var_increment(thd->status_var.com_stat[SQLCOM_CREATE_DB]);
if (thd->LEX_STRING_make(&db, packet, packet_length -1) ||
thd->LEX_STRING_make(&alias, db.str, db.length) ||
check_db_name(&db))
@ -1043,8 +1040,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
}
case COM_DROP_DB: // QQ: To be removed
{
statistic_increment(thd->status_var.com_stat[SQLCOM_DROP_DB],
&LOCK_status);
status_var_increment(thd->status_var.com_stat[SQLCOM_DROP_DB]);
LEX_STRING db;
if (thd->LEX_STRING_make(&db, packet, packet_length - 1) ||
@ -1073,7 +1069,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
ushort flags;
uint32 slave_server_id;
statistic_increment(thd->status_var.com_other,&LOCK_status);
status_var_increment(thd->status_var.com_other);
thd->enable_slow_log= opt_log_slow_admin_statements;
if (check_global_access(thd, REPL_SLAVE_ACL))
break;
@ -1099,8 +1095,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
case COM_REFRESH:
{
bool not_used;
statistic_increment(thd->status_var.com_stat[SQLCOM_FLUSH],
&LOCK_status);
status_var_increment(thd->status_var.com_stat[SQLCOM_FLUSH]);
ulong options= (ulong) (uchar) packet[0];
if (check_global_access(thd,RELOAD_ACL))
break;
@ -1112,7 +1107,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
#ifndef EMBEDDED_LIBRARY
case COM_SHUTDOWN:
{
statistic_increment(thd->status_var.com_other, &LOCK_status);
status_var_increment(thd->status_var.com_other);
if (check_global_access(thd,SHUTDOWN_ACL))
break; /* purecov: inspected */
/*
@ -1164,8 +1159,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
#endif
general_log_print(thd, command, NullS);
statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_STATUS],
&LOCK_status);
status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_STATUS]);
calc_sum_of_all_status(&current_global_status_var);
if (!(uptime= (ulong) (thd->start_time - server_start_time)))
queries_per_second1000= 0;
@ -1201,12 +1195,11 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
break;
}
case COM_PING:
statistic_increment(thd->status_var.com_other, &LOCK_status);
status_var_increment(thd->status_var.com_other);
send_ok(thd); // Tell client we are alive
break;
case COM_PROCESS_INFO:
statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_PROCESSLIST],
&LOCK_status);
status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_PROCESSLIST]);
if (!thd->security_ctx->priv_user[0] &&
check_global_access(thd, PROCESS_ACL))
break;
@ -1217,15 +1210,14 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
break;
case COM_PROCESS_KILL:
{
statistic_increment(thd->status_var.com_stat[SQLCOM_KILL], &LOCK_status);
status_var_increment(thd->status_var.com_stat[SQLCOM_KILL]);
ulong id=(ulong) uint4korr(packet);
sql_kill(thd,id,false);
break;
}
case COM_SET_OPTION:
{
statistic_increment(thd->status_var.com_stat[SQLCOM_SET_OPTION],
&LOCK_status);
status_var_increment(thd->status_var.com_stat[SQLCOM_SET_OPTION]);
uint opt_command= uint2korr(packet);
switch (opt_command) {
@ -1244,7 +1236,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
break;
}
case COM_DEBUG:
statistic_increment(thd->status_var.com_other, &LOCK_status);
status_var_increment(thd->status_var.com_other);
if (check_global_access(thd, SUPER_ACL))
break; /* purecov: inspected */
mysql_print_status();
@ -1783,8 +1775,7 @@ mysql_execute_command(THD *thd)
#ifdef HAVE_REPLICATION
} /* endif unlikely slave */
#endif
statistic_increment(thd->status_var.com_stat[lex->sql_command],
&LOCK_status);
status_var_increment(thd->status_var.com_stat[lex->sql_command]);
switch (lex->sql_command) {
case SQLCOM_SHOW_EVENTS: