1berry/MariaDB-server
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Bug#25721

Browse Source 
"Concurrent ALTER/CREATE SERVER can lead to deadlock"
  Deadlock caused by inconsistant use of mutexes in sql_server.cc
  One mutex has been removed to resolve deadlock.
  Many functions were made private which should not be exported.
  Unused variables and function removed.
This commit is contained in:
acurtis/antony@xiphis.org/ltamd64.xiphis.org 2007-03-23 17:31:27 -07:00
parent 32da2907f8
commit 14ccc65994
5 changed files with 226 additions and 227 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
mysql-test/r/federated_server.result
View File

@ -189,6 +189,31 @@ drop user guest_select@localhost;
drop table federated.t1;
drop server 's1';
# End of 5.1 tests
use test;
create procedure p1 ()
begin
DECLARE v INT DEFAULT 0;
DECLARE e INT DEFAULT 0;
DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET e = e + 1;
WHILE v < 10000 do
CREATE SERVER s
FOREIGN DATA WRAPPER mysql
OPTIONS (USER 'Remote', HOST '192.168.1.106', DATABASE 'test');
ALTER SERVER s OPTIONS (USER 'Remote');
DROP SERVER s;
SET v = v + 1;
END WHILE;
SELECT e > 0;
END//
use test;
call p1();
call p1();
e > 0
1
e > 0
1
drop procedure p1;
drop server if exists s;
DROP TABLE IF EXISTS federated.t1;
DROP DATABASE IF EXISTS federated;
DROP TABLE IF EXISTS federated.t1;

35
mysql-test/t/federated_server.test
View File

@ -234,4 +234,39 @@ drop server 's1';
--echo # End of 5.1 tests
#
# Bug#25721 - deadlock with ALTER/CREATE SERVER
#
connect (other,localhost,root,,);
connection master;
use test;
delimiter //;
create procedure p1 ()
begin
DECLARE v INT DEFAULT 0;
DECLARE e INT DEFAULT 0;
DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET e = e + 1;
WHILE v < 10000 do
CREATE SERVER s
FOREIGN DATA WRAPPER mysql
OPTIONS (USER 'Remote', HOST '192.168.1.106', DATABASE 'test');
ALTER SERVER s OPTIONS (USER 'Remote');
DROP SERVER s;
SET v = v + 1;
END WHILE;
SELECT e > 0;
END//
delimiter ;//
connection other;
use test;
send call p1();
connection master;
call p1();
connection other;
reap;
drop procedure p1;
drop server if exists s;
source include/federated_cleanup.inc;

2
sql/sql_parse.cc
View File

@ -4320,7 +4320,7 @@ create_sp_error:
if ((err_code= drop_server(thd, &lex->server_options)))
{
if (! lex->drop_if_exists && err_code == ER_FOREIGN_SERVER_EXISTS)
if (! lex->drop_if_exists && err_code == ER_FOREIGN_SERVER_DOESNT_EXIST)
{
DBUG_PRINT("info", ("problem dropping server %s",
lex->server_options.server_name));

361
sql/sql_servers.cc
View File

@ -25,14 +25,43 @@
#include "sp_head.h"
#include "sp.h"
HASH servers_cache;
pthread_mutex_t servers_cache_mutex; // To init the hash
uint servers_cache_initialised=FALSE;
/* Version of server table. incremented by servers_load */
static uint servers_version=0;
/*
We only use 1 mutex to guard the data structures - THR_LOCK_servers.
Read locked when only reading data and write-locked for all other access.
*/
static HASH servers_cache;
static MEM_ROOT mem;
static rw_lock_t THR_LOCK_servers;
static bool get_server_from_table_to_cache(TABLE *table);
/* insert functions */
static int insert_server(THD *thd, FOREIGN_SERVER *server_options);
static int insert_server_record(TABLE *table, FOREIGN_SERVER *server);
static int insert_server_record_into_cache(FOREIGN_SERVER *server);
static void prepare_server_struct_for_insert(LEX_SERVER_OPTIONS *server_options,
FOREIGN_SERVER *server);
/* drop functions */
static int delete_server_record(TABLE *table,
char *server_name,
int server_name_length);
static int delete_server_record_in_cache(LEX_SERVER_OPTIONS *server_options);
/* update functions */
static void prepare_server_struct_for_update(LEX_SERVER_OPTIONS *server_options,
FOREIGN_SERVER *existing,
FOREIGN_SERVER *altered);
static int update_server(THD *thd, FOREIGN_SERVER *existing,
FOREIGN_SERVER *altered);
static int update_server_record(TABLE *table, FOREIGN_SERVER *server);
static int update_server_record_in_cache(FOREIGN_SERVER *existing,
FOREIGN_SERVER *altered);
/* utility functions */
static void merge_server_struct(FOREIGN_SERVER *from, FOREIGN_SERVER *to);
static byte *servers_cache_get_key(FOREIGN_SERVER *server, uint *length,
my_bool not_used __attribute__((unused)))
{
@ -45,6 +74,7 @@ static byte *servers_cache_get_key(FOREIGN_SERVER *server, uint *length,
DBUG_RETURN((byte*) server->server_name);
}
/*
Initialize structures responsible for servers used in federated
server scheme information for them from the server
@ -64,35 +94,27 @@ static byte *servers_cache_get_key(FOREIGN_SERVER *server, uint *length,
1 Could not initialize servers
*/
my_bool servers_init(bool dont_read_servers_table)
bool servers_init(bool dont_read_servers_table)
{
THD *thd;
my_bool return_val= 0;
bool return_val= FALSE;
DBUG_ENTER("servers_init");
/* init the mutex */
if (pthread_mutex_init(&servers_cache_mutex, MY_MUTEX_INIT_FAST))
DBUG_RETURN(1);
if (my_rwlock_init(&THR_LOCK_servers, NULL))
DBUG_RETURN(1);
DBUG_RETURN(TRUE);
/* initialise our servers cache */
if (hash_init(&servers_cache, system_charset_info, 32, 0, 0,
(hash_get_key) servers_cache_get_key, 0, 0))
{
return_val= 1; /* we failed, out of memory? */
return_val= TRUE; /* we failed, out of memory? */
goto end;
}
/* Initialize the mem root for data */
init_alloc_root(&mem, ACL_ALLOC_BLOCK_SIZE, 0);
/*
at this point, the cache is initialised, let it be known
*/
servers_cache_initialised= TRUE;
if (dont_read_servers_table)
goto end;
@ -100,7 +122,7 @@ my_bool servers_init(bool dont_read_servers_table)
To be able to run this from boot, we allocate a temporary THD
*/
if (!(thd=new THD))
DBUG_RETURN(1);
DBUG_RETURN(TRUE);
thd->thread_stack= (char*) &thd;
thd->store_globals();
/*
@ -130,19 +152,13 @@ end:
TRUE Error
*/
static my_bool servers_load(THD *thd, TABLE_LIST *tables)
static bool servers_load(THD *thd, TABLE_LIST *tables)
{
TABLE *table;
READ_RECORD read_record_info;
my_bool return_val= TRUE;
bool return_val= TRUE;
DBUG_ENTER("servers_load");
if (!servers_cache_initialised)
DBUG_RETURN(0);
/* need to figure out how to utilise this variable */
servers_version++; /* servers updated */
/* first, send all cached rows to sleep with the fishes, oblivion!
I expect this crappy comment replaced */
free_root(&mem, MYF(MY_MARK_BLOCKS_FREE));
@ -156,7 +172,7 @@ static my_bool servers_load(THD *thd, TABLE_LIST *tables)
goto end;
}
return_val=0;
return_val= FALSE;
end:
end_read_record(&read_record_info);
@ -183,10 +199,10 @@ end:
TRUE Failure
*/
my_bool servers_reload(THD *thd)
bool servers_reload(THD *thd)
{
TABLE_LIST tables[1];
my_bool return_val= 1;
bool return_val= TRUE;
DBUG_ENTER("servers_reload");
if (thd->locked_tables)
@ -196,10 +212,9 @@ my_bool servers_reload(THD *thd)
close_thread_tables(thd);
}
/*
To avoid deadlocks we should obtain table locks before
obtaining servers_cache->lock mutex.
*/
DBUG_PRINT("info", ("locking servers_cache"));
rw_wrlock(&THR_LOCK_servers);
bzero((char*) tables, sizeof(tables));
tables[0].alias= tables[0].table_name= (char*) "servers";
tables[0].db= (char*) "mysql";
@ -212,12 +227,6 @@ my_bool servers_reload(THD *thd)
goto end;
}
DBUG_PRINT("info", ("locking servers_cache"));
VOID(pthread_mutex_lock(&servers_cache_mutex));
//old_servers_cache= servers_cache;
//old_mem=mem;
if ((return_val= servers_load(thd, tables)))
{ // Error. Revert to old list
/* blast, for now, we have no servers, discuss later way to preserve */
@ -226,14 +235,14 @@ my_bool servers_reload(THD *thd)
servers_free();
}
DBUG_PRINT("info", ("unlocking servers_cache"));
VOID(pthread_mutex_unlock(&servers_cache_mutex));
end:
close_thread_tables(thd);
DBUG_PRINT("info", ("unlocking servers_cache"));
rw_unlock(&THR_LOCK_servers);
DBUG_RETURN(return_val);
}
/*
Initialize structures responsible for servers used in federated
server scheme information for them from the server
@ -260,7 +269,8 @@ end:
1 could not insert server struct into global servers cache
*/
my_bool get_server_from_table_to_cache(TABLE *table)
static bool
get_server_from_table_to_cache(TABLE *table)
{
/* alloc a server struct */
char *ptr;
@ -308,69 +318,6 @@ my_bool get_server_from_table_to_cache(TABLE *table)
DBUG_RETURN(FALSE);
}
/*
SYNOPSIS
server_exists_in_table()
THD *thd - thread pointer
LEX_SERVER_OPTIONS *server_options - pointer to Lex->server_options
NOTES
This function takes a LEX_SERVER_OPTIONS struct, which is very much the
same type of structure as a FOREIGN_SERVER, it contains the values parsed
in any one of the [CREATE|DELETE|DROP] SERVER statements. Using the
member "server_name", index_read_idx either founds the record and returns
1, or doesn't find the record, and returns 0
RETURN VALUES
0 record not found
1 record found
*/
my_bool server_exists_in_table(THD *thd, LEX_SERVER_OPTIONS *server_options)
{
int result= 1;
int error= 0;
TABLE_LIST tables;
TABLE *table;
DBUG_ENTER("server_exists");
bzero((char*) &tables, sizeof(tables));
tables.db= (char*) "mysql";
tables.alias= tables.table_name= (char*) "servers";
/* need to open before acquiring THR_LOCK_plugin or it will deadlock */
if (! (table= open_ltable(thd, &tables, TL_WRITE)))
DBUG_RETURN(TRUE);
table->use_all_columns();
rw_wrlock(&THR_LOCK_servers);
VOID(pthread_mutex_lock(&servers_cache_mutex));
/* set the field that's the PK to the value we're looking for */
table->field[0]->store(server_options->server_name,
server_options->server_name_length,
system_charset_info);
if ((error= table->file->index_read_idx(table->record[0], 0,
(byte *)table->field[0]->ptr,
table->key_info[0].key_length,
HA_READ_KEY_EXACT)))
{
if (error != HA_ERR_KEY_NOT_FOUND && error != HA_ERR_END_OF_FILE)
{
table->file->print_error(error, MYF(0));
result= -1;
}
result= 0;
DBUG_PRINT("info",("record for server '%s' not found!",
server_options->server_name));
}
VOID(pthread_mutex_unlock(&servers_cache_mutex));
rw_unlock(&THR_LOCK_servers);
DBUG_RETURN(result);
}
/*
SYNOPSIS
@ -382,15 +329,18 @@ my_bool server_exists_in_table(THD *thd, LEX_SERVER_OPTIONS *server_options)
This function takes a server object that is has all members properly
prepared, ready to be inserted both into the mysql.servers table and
the servers cache.
THR_LOCK_servers must be write locked.
RETURN VALUES
0 - no error
other - error code
*/
int insert_server(THD *thd, FOREIGN_SERVER *server)
static int
insert_server(THD *thd, FOREIGN_SERVER *server)
{
int error= 0;
int error= -1;
TABLE_LIST tables;
TABLE *table;
@ -402,13 +352,7 @@ int insert_server(THD *thd, FOREIGN_SERVER *server)
/* need to open before acquiring THR_LOCK_plugin or it will deadlock */
if (! (table= open_ltable(thd, &tables, TL_WRITE)))
DBUG_RETURN(TRUE);
/* lock mutex to make sure no changes happen */
VOID(pthread_mutex_lock(&servers_cache_mutex));
/* lock table */
rw_wrlock(&THR_LOCK_servers);
goto end;
/* insert the server into the table */
if ((error= insert_server_record(table, server)))
@ -419,12 +363,10 @@ int insert_server(THD *thd, FOREIGN_SERVER *server)
goto end;
end:
/* unlock the table */
rw_unlock(&THR_LOCK_servers);
VOID(pthread_mutex_unlock(&servers_cache_mutex));
DBUG_RETURN(error);
}
/*
SYNOPSIS
int insert_server_record_into_cache()
@ -434,13 +376,16 @@ end:
This function takes a FOREIGN_SERVER pointer to an allocated (root mem)
and inserts it into the global servers cache
THR_LOCK_servers must be write locked.
RETURN VALUE
0 - no error
>0 - error code
*/
int insert_server_record_into_cache(FOREIGN_SERVER *server)
static int
insert_server_record_into_cache(FOREIGN_SERVER *server)
{
int error=0;
DBUG_ENTER("insert_server_record_into_cache");
@ -461,6 +406,7 @@ int insert_server_record_into_cache(FOREIGN_SERVER *server)
DBUG_RETURN(error);
}
/*
SYNOPSIS
store_server_fields()
@ -478,7 +424,8 @@ int insert_server_record_into_cache(FOREIGN_SERVER *server)
*/
void store_server_fields(TABLE *table, FOREIGN_SERVER *server)
static void
store_server_fields(TABLE *table, FOREIGN_SERVER *server)
{
table->use_all_columns();
@ -539,6 +486,7 @@ void store_server_fields(TABLE *table, FOREIGN_SERVER *server)
*/
static
int insert_server_record(TABLE *table, FOREIGN_SERVER *server)
{
int error;
@ -606,7 +554,7 @@ int insert_server_record(TABLE *table, FOREIGN_SERVER *server)
int drop_server(THD *thd, LEX_SERVER_OPTIONS *server_options)
{
int error= 0;
int error;
TABLE_LIST tables;
TABLE *table;
@ -618,28 +566,33 @@ int drop_server(THD *thd, LEX_SERVER_OPTIONS *server_options)
tables.db= (char*) "mysql";
tables.alias= tables.table_name= (char*) "servers";
/* need to open before acquiring THR_LOCK_plugin or it will deadlock */
if (! (table= open_ltable(thd, &tables, TL_WRITE)))
DBUG_RETURN(TRUE);
rw_wrlock(&THR_LOCK_servers);
VOID(pthread_mutex_lock(&servers_cache_mutex));
if ((error= delete_server_record(table,
server_options->server_name,
server_options->server_name_length)))
goto end;
/* hit the memory hit first */
if ((error= delete_server_record_in_cache(server_options)))
goto end;
if (! (table= open_ltable(thd, &tables, TL_WRITE)))
{
error= my_errno;
goto end;
}
error= delete_server_record(table,
server_options->server_name,
server_options->server_name_length);
/*
Perform a reload so we don't have a 'hole' in our mem_root
*/
servers_load(thd, &tables);
end:
VOID(pthread_mutex_unlock(&servers_cache_mutex));
rw_unlock(&THR_LOCK_servers);
DBUG_RETURN(error);
}
/*
SYNOPSIS
@ -658,10 +611,10 @@ end:
*/
int delete_server_record_in_cache(LEX_SERVER_OPTIONS *server_options)
static int
delete_server_record_in_cache(LEX_SERVER_OPTIONS *server_options)
{
int error= 0;
int error= ER_FOREIGN_SERVER_DOESNT_EXIST;
FOREIGN_SERVER *server;
DBUG_ENTER("delete_server_record_in_cache");
@ -677,7 +630,7 @@ int delete_server_record_in_cache(LEX_SERVER_OPTIONS *server_options)
DBUG_PRINT("info", ("server_name %s length %d not found!",
server_options->server_name,
server_options->server_name_length));
// what should be done if not found in the cache?
goto end;
}
/*
We succeded in deletion of the server to the table, now delete
@ -687,14 +640,15 @@ int delete_server_record_in_cache(LEX_SERVER_OPTIONS *server_options)
server->server_name,
server->server_name_length));
if (server)
VOID(hash_delete(&servers_cache, (byte*) server));
servers_version++; /* servers updated */
VOID(hash_delete(&servers_cache, (byte*) server));
error= 0;
end:
DBUG_RETURN(error);
}
/*
SYNOPSIS
@ -714,6 +668,8 @@ int delete_server_record_in_cache(LEX_SERVER_OPTIONS *server_options)
table for the particular server via the call to update_server_record,
and in the servers_cache via update_server_record_in_cache.
THR_LOCK_servers must be write locked.
RETURN VALUE
0 - no error
>0 - error code
@ -722,7 +678,7 @@ int delete_server_record_in_cache(LEX_SERVER_OPTIONS *server_options)
int update_server(THD *thd, FOREIGN_SERVER *existing, FOREIGN_SERVER *altered)
{
int error= 0;
int error;
TABLE *table;
TABLE_LIST tables;
DBUG_ENTER("update_server");
@ -732,19 +688,26 @@ int update_server(THD *thd, FOREIGN_SERVER *existing, FOREIGN_SERVER *altered)
tables.alias= tables.table_name= (char*)"servers";
if (!(table= open_ltable(thd, &tables, TL_WRITE)))
DBUG_RETURN(1);
{
error= my_errno;
goto end;
}
rw_wrlock(&THR_LOCK_servers);
if ((error= update_server_record(table, altered)))
goto end;
update_server_record_in_cache(existing, altered);
error= update_server_record_in_cache(existing, altered);
/*
Perform a reload so we don't have a 'hole' in our mem_root
*/
servers_load(thd, &tables);
end:
rw_unlock(&THR_LOCK_servers);
DBUG_RETURN(error);
}
/*
SYNOPSIS
@ -761,6 +724,8 @@ end:
HASH, then the updated record inserted, in essence replacing the old
record.
THR_LOCK_servers must be write locked.
RETURN VALUE
0 - no error
1 - error
@ -791,13 +756,13 @@ int update_server_record_in_cache(FOREIGN_SERVER *existing,
{
DBUG_PRINT("info", ("had a problem inserting server %s at %lx",
altered->server_name, (long unsigned int) altered));
error= 1;
error= ER_OUT_OF_RESOURCES;
}
servers_version++; /* servers updated */
DBUG_RETURN(error);
}
/*
SYNOPSIS
@ -830,9 +795,9 @@ void merge_server_struct(FOREIGN_SERVER *from, FOREIGN_SERVER *to)
to->password= strdup_root(&mem, from->password);
if (to->port == -1)
to->port= from->port;
if (!to->socket)
if (!to->socket && from->socket)
to->socket= strdup_root(&mem, from->socket);
if (!to->scheme)
if (!to->scheme && from->scheme)
to->scheme= strdup_root(&mem, from->scheme);
if (!to->owner)
to->owner= strdup_root(&mem, from->owner);
@ -840,6 +805,7 @@ void merge_server_struct(FOREIGN_SERVER *from, FOREIGN_SERVER *to)
DBUG_VOID_RETURN;
}
/*
SYNOPSIS
@ -862,7 +828,9 @@ void merge_server_struct(FOREIGN_SERVER *from, FOREIGN_SERVER *to)
*/
int update_server_record(TABLE *table, FOREIGN_SERVER *server)
static int
update_server_record(TABLE *table, FOREIGN_SERVER *server)
{
int error=0;
DBUG_ENTER("update_server_record");
@ -878,10 +846,7 @@ int update_server_record(TABLE *table, FOREIGN_SERVER *server)
HA_READ_KEY_EXACT)))
{
if (error != HA_ERR_KEY_NOT_FOUND && error != HA_ERR_END_OF_FILE)
{
table->file->print_error(error, MYF(0));
error= 1;
}
DBUG_PRINT("info",("server not found!"));
error= ER_FOREIGN_SERVER_DOESNT_EXIST;
}
@ -901,6 +866,7 @@ end:
DBUG_RETURN(error);
}
/*
SYNOPSIS
@ -916,11 +882,11 @@ end:
*/
int delete_server_record(TABLE *table,
char *server_name,
int server_name_length)
static int
delete_server_record(TABLE *table,
char *server_name, int server_name_length)
{
int error= 0;
int error;
DBUG_ENTER("delete_server_record");
table->use_all_columns();
@ -933,10 +899,7 @@ int delete_server_record(TABLE *table,
HA_READ_KEY_EXACT)))
{
if (error != HA_ERR_KEY_NOT_FOUND && error != HA_ERR_END_OF_FILE)
{
table->file->print_error(error, MYF(0));
error= 1;
}
DBUG_PRINT("info",("server not found!"));
error= ER_FOREIGN_SERVER_DOESNT_EXIST;
}
@ -965,28 +928,35 @@ int delete_server_record(TABLE *table,
int create_server(THD *thd, LEX_SERVER_OPTIONS *server_options)
{
int error;
int error= ER_FOREIGN_SERVER_EXISTS;
FOREIGN_SERVER *server;
DBUG_ENTER("create_server");
DBUG_PRINT("info", ("server_options->server_name %s",
server_options->server_name));
rw_wrlock(&THR_LOCK_servers);
/* hit the memory first */
if (hash_search(&servers_cache, (byte*) server_options->server_name,
server_options->server_name_length))
goto end;
server= (FOREIGN_SERVER *)alloc_root(&mem,
sizeof(FOREIGN_SERVER));
if ((error= prepare_server_struct_for_insert(server_options, server)))
goto end;
prepare_server_struct_for_insert(server_options, server);
if ((error= insert_server(thd, server)))
goto end;
error= insert_server(thd, server);
DBUG_PRINT("info", ("error returned %d", error));
end:
rw_unlock(&THR_LOCK_servers);
DBUG_RETURN(error);
}
/*
SYNOPSIS
@ -1003,37 +973,33 @@ end:
int alter_server(THD *thd, LEX_SERVER_OPTIONS *server_options)
{
int error= 0;
int error= ER_FOREIGN_SERVER_DOESNT_EXIST;
FOREIGN_SERVER *altered, *existing;
DBUG_ENTER("alter_server");
DBUG_PRINT("info", ("server_options->server_name %s",
server_options->server_name));
altered= (FOREIGN_SERVER *)alloc_root(&mem,
sizeof(FOREIGN_SERVER));
VOID(pthread_mutex_lock(&servers_cache_mutex));
rw_wrlock(&THR_LOCK_servers);
if (!(existing= (FOREIGN_SERVER *) hash_search(&servers_cache,
(byte*) server_options->server_name,
server_options->server_name_length)))
{
error= ER_FOREIGN_SERVER_DOESNT_EXIST;
goto end;
}
if ((error= prepare_server_struct_for_update(server_options, existing, altered)))
goto end;
if ((error= update_server(thd, existing, altered)))
goto end;
altered= (FOREIGN_SERVER *)alloc_root(&mem,
sizeof(FOREIGN_SERVER));
prepare_server_struct_for_update(server_options, existing, altered);
error= update_server(thd, existing, altered);
end:
DBUG_PRINT("info", ("error returned %d", error));
VOID(pthread_mutex_unlock(&servers_cache_mutex));
rw_unlock(&THR_LOCK_servers);
DBUG_RETURN(error);
}
/*
SYNOPSIS
@ -1044,19 +1010,17 @@ end:
NOTES
RETURN VALUE
0 - no error
none
*/
int prepare_server_struct_for_insert(LEX_SERVER_OPTIONS *server_options,
FOREIGN_SERVER *server)
static void
prepare_server_struct_for_insert(LEX_SERVER_OPTIONS *server_options,
FOREIGN_SERVER *server)
{
int error;
char *unset_ptr= (char*)"";
DBUG_ENTER("prepare_server_struct");
error= 0;
/* these two MUST be set */
server->server_name= strdup_root(&mem, server_options->server_name);
server->server_name_length= server_options->server_name_length;
@ -1086,7 +1050,7 @@ int prepare_server_struct_for_insert(LEX_SERVER_OPTIONS *server_options,
server->owner= server_options->owner ?
strdup_root(&mem, server_options->owner) : unset_ptr;
DBUG_RETURN(error);
DBUG_VOID_RETURN;
}
/*
@ -1102,13 +1066,12 @@ int prepare_server_struct_for_insert(LEX_SERVER_OPTIONS *server_options,
*/
int prepare_server_struct_for_update(LEX_SERVER_OPTIONS *server_options,
FOREIGN_SERVER *existing,
FOREIGN_SERVER *altered)
static void
prepare_server_struct_for_update(LEX_SERVER_OPTIONS *server_options,
FOREIGN_SERVER *existing,
FOREIGN_SERVER *altered)
{
int error;
DBUG_ENTER("prepare_server_struct_for_update");
error= 0;
altered->server_name= strdup_root(&mem, server_options->server_name);
altered->server_name_length= server_options->server_name_length;
@ -1159,7 +1122,7 @@ int prepare_server_struct_for_update(LEX_SERVER_OPTIONS *server_options,
(strcmp(server_options->owner, existing->owner))) ?
strdup_root(&mem, server_options->owner) : 0;
DBUG_RETURN(error);
DBUG_VOID_RETURN;
}
/*
@ -1178,17 +1141,15 @@ int prepare_server_struct_for_update(LEX_SERVER_OPTIONS *server_options,
void servers_free(bool end)
{
DBUG_ENTER("servers_free");
if (!servers_cache_initialised)
if (!hash_inited(&servers_cache))
DBUG_VOID_RETURN;
VOID(pthread_mutex_destroy(&servers_cache_mutex));
servers_cache_initialised=0;
rwlock_destroy(&THR_LOCK_servers);
free_root(&mem,MYF(0));
hash_free(&servers_cache);
DBUG_VOID_RETURN;
}
/*
SYNOPSIS
@ -1220,7 +1181,7 @@ FOREIGN_SERVER *get_server_by_name(const char *server_name)
}
DBUG_PRINT("info", ("locking servers_cache"));
VOID(pthread_mutex_lock(&servers_cache_mutex));
rw_rdlock(&THR_LOCK_servers);
if (!(server= (FOREIGN_SERVER *) hash_search(&servers_cache,
(byte*) server_name,
server_name_length)))
@ -1230,7 +1191,7 @@ FOREIGN_SERVER *get_server_by_name(const char *server_name)
server= (FOREIGN_SERVER *) NULL;
}
DBUG_PRINT("info", ("unlocking servers_cache"));
VOID(pthread_mutex_unlock(&servers_cache_mutex));
rw_unlock(&THR_LOCK_servers);
DBUG_RETURN(server);
}

30
sql/sql_servers.h
View File

@ -25,40 +25,18 @@ typedef struct st_federated_server
} FOREIGN_SERVER;
/* cache handlers */
my_bool servers_init(bool dont_read_server_table);
my_bool servers_reload(THD *thd);
my_bool get_server_from_table_to_cache(TABLE *table);
bool servers_init(bool dont_read_server_table);
bool servers_reload(THD *thd);
void servers_free(bool end=0);
/* insert functions */
int create_server(THD *thd, LEX_SERVER_OPTIONS *server_options);
int insert_server(THD *thd, FOREIGN_SERVER *server_options);
int insert_server_record(TABLE *table, FOREIGN_SERVER *server);
int insert_server_record_into_cache(FOREIGN_SERVER *server);
void store_server_fields_for_insert(TABLE *table, FOREIGN_SERVER *server);
void store_server_fields_for_insert(TABLE *table,
FOREIGN_SERVER *existing,
FOREIGN_SERVER *altered);
int prepare_server_struct_for_insert(LEX_SERVER_OPTIONS *server_options,
FOREIGN_SERVER *server);
/* drop functions */
int drop_server(THD *thd, LEX_SERVER_OPTIONS *server_options);
int delete_server_record(TABLE *table,
char *server_name,
int server_name_length);
int delete_server_record_in_cache(LEX_SERVER_OPTIONS *server_options);
/* update functions */
int alter_server(THD *thd, LEX_SERVER_OPTIONS *server_options);
int prepare_server_struct_for_update(LEX_SERVER_OPTIONS *server_options,
FOREIGN_SERVER *existing,
FOREIGN_SERVER *altered);
int update_server(THD *thd, FOREIGN_SERVER *existing, FOREIGN_SERVER *altered);
int update_server_record(TABLE *table, FOREIGN_SERVER *server);
int update_server_record_in_cache(FOREIGN_SERVER *existing,
FOREIGN_SERVER *altered);
/* utility functions */
void merge_server_struct(FOREIGN_SERVER *from, FOREIGN_SERVER *to);
/* lookup functions */
FOREIGN_SERVER *get_server_by_name(const char *server_name);
my_bool server_exists_in_table(THD *thd, char *server_name);