mirror/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-03-29 18:35:35 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions1

Speed up connection time:

Browse source 
-Change my_rnd() slightly to make it safer if two threads use it at the same time.
-Avoid some sprintf and strmov in vio.
-Changed thread_count to be automically incremented (instead of under LOCK_thread_count).
-Thread cache now uses LOCK_thread_cache instead of LOCK_thread_count.
-Moved delete thd out from LOCK_thread_count.
-Save some mysql_cond_broadcast(&COND_thread_count) calls.
-Removed call to getsockname() during connect.
-Initialize random generator without locks.

Other things:
-Added thread_safe_decrement32() and thread_safe_increment32()
-Removed sql_rnd_with_mutex() and get_thread_running()

Thanks to Yoshinori Matsunobu for the benchmark of connection speed and to
Domas Mituzas for the inspiration for many of the fixes.
 

include/violite.h:
  Change desc to a string pointer
mysql-test/suite/perfschema/r/all_instances.result:
  Added new mutex
mysys/my_rnd.c:
  Change my_rnd() slightly to make it safer if two threads use it at the same time.
sql/event_scheduler.cc:
  Changed thread_count to be automically incremented
  Moved some safe things out from LOCK_thread_count.
  Simplify deleting of THD for running thread.
sql/mysqld.cc:
  Changed thread_count to be automically incremented
  Thread cache now uses LOCK_thread_cache instead of LOCK_thread_count
  Added delete_running_thd()
  Moved delete thd out from LOCK_thread_count
  More DBUG_ENTER
  Only call  mysql_cond_broadcast(&COND_thread_count) if thread_count is 0
  Removed call to getsockname() (old not anymore needed check)
sql/mysqld.h:
  Removed sql_rnd_with_mutex() (not needed anymore)
  Removed not used function get_thread_running()
  Added thread_safe_decrement32() and thread_safe_increment32()
  Simplified dec_thread_running() and inc_thread_running()
sql/sql_class.cc:
  Removed thd_lock_thread_count() and thd_unlock_thread_count()
  Initialize random generator without locks
sql/sql_insert.cc:
  Changed thread_count to be automically incremented
sql/sql_parse.cc:
  Changed thread_count to be automically incremented
vio/vio.c:
  Don't generate 'desc' with sprintf/strmov. Assign a pointer instead.
  (Good enough as this is just for debugging)
This commit is contained in:
Michael Widenius 2013-03-20 01:46:35 +02:00
parent 8b047ac5c4
commit 615d51b650
10 changed files with 178 additions and 176 deletions

2
include/violite.h
View file

@ -216,7 +216,7 @@ struct st_vio
struct sockaddr_storage remote; /* Remote internet address */
int addrLen; /* Length of remote address */
enum enum_vio_type type; /* Type of connection */
char desc[30]; /* String description */
const char *desc; /* String description */
char *read_buffer; /* buffer for vio_read_buff */
char *read_pos; /* start of unfetched data in the
read buffer */

1
mysql-test/suite/perfschema/r/all_instances.result
View file

@ -64,6 +64,7 @@ wait/synch/mutex/sql/LOCK_server_started
wait/synch/mutex/sql/LOCK_slave_list
wait/synch/mutex/sql/LOCK_stats
wait/synch/mutex/sql/LOCK_status
wait/synch/mutex/sql/LOCK_thread_cache
wait/synch/mutex/sql/LOCK_thread_count
wait/synch/mutex/sql/LOCK_user_conn
wait/synch/mutex/sql/LOCK_user_locks

15
mysys/my_rnd.c
View file

@ -45,11 +45,20 @@ void my_rnd_init(struct my_rnd_struct *rand_st, ulong seed1, ulong seed2)
RETURN VALUE
generated pseudo random number
NOTE:
This is codes so that it can be called by two threads at the same time
with minimum impact.
(As the number is supposed to be random, it doesn't matter much if
rand->seed1 or rand->seed2 are updated with slightly wrong numbers or
if two threads gets the same number.
*/
double my_rnd(struct my_rnd_struct *rand_st)
{
rand_st->seed1=(rand_st->seed1*3+rand_st->seed2) % rand_st->max_value;
rand_st->seed2=(rand_st->seed1+rand_st->seed2+33) % rand_st->max_value;
return (((double) rand_st->seed1)/rand_st->max_value_dbl);
unsigned long seed1;
seed1= (rand_st->seed1*3+rand_st->seed2) % rand_st->max_value;
rand_st->seed2=(seed1+rand_st->seed2+33) % rand_st->max_value;
rand_st->seed1= seed1;
return (((double) seed1)/rand_st->max_value_dbl);
}

26
sql/event_scheduler.cc
View file

@ -132,11 +132,11 @@ post_init_event_thread(THD *thd)
return TRUE;
}
thread_safe_increment32(&thread_count, &thread_count_lock);
mysql_mutex_lock(&LOCK_thread_count);
threads.append(thd);
thread_count++;
inc_thread_running();
mysql_mutex_unlock(&LOCK_thread_count);
inc_thread_running();
return FALSE;
}
@ -154,12 +154,8 @@ deinit_event_thread(THD *thd)
{
thd->proc_info= "Clearing";
DBUG_PRINT("exit", ("Event thread finishing"));
mysql_mutex_lock(&LOCK_thread_count);
thread_count--;
dec_thread_running();
delete thd;
mysql_cond_broadcast(&COND_thread_count);
mysql_mutex_unlock(&LOCK_thread_count);
delete_running_thd(thd);
}
@ -436,12 +432,7 @@ Event_scheduler::start()
ret= TRUE;
new_thd->proc_info= "Clearing";
mysql_mutex_lock(&LOCK_thread_count);
thread_count--;
dec_thread_running();
delete new_thd;
mysql_cond_broadcast(&COND_thread_count);
mysql_mutex_unlock(&LOCK_thread_count);
delete_running_thd(new_thd);
}
end:
UNLOCK_DATA();
@ -570,12 +561,7 @@ error:
if (new_thd)
{
new_thd->proc_info= "Clearing";
mysql_mutex_lock(&LOCK_thread_count);
thread_count--;
dec_thread_running();
delete new_thd;
mysql_cond_broadcast(&COND_thread_count);
mysql_mutex_unlock(&LOCK_thread_count);
delete_running_thd(new_thd);
}
delete event_name;
DBUG_RETURN(TRUE);

210
sql/mysqld.cc
View file

@ -465,7 +465,7 @@ ulong delay_key_write_options;
uint protocol_version;
uint lower_case_table_names;
ulong tc_heuristic_recover= 0;
uint volatile thread_count;
int32 thread_count;
int32 thread_running;
ulong thread_created;
ulong back_log, connect_timeout, concurrency, server_id;
@ -489,6 +489,7 @@ ulong executed_events=0;
query_id_t global_query_id;
my_atomic_rwlock_t global_query_id_lock;
my_atomic_rwlock_t thread_running_lock;
my_atomic_rwlock_t thread_count_lock;
my_atomic_rwlock_t statistics_lock;
ulong aborted_threads, aborted_connects;
ulong delayed_insert_timeout, delayed_insert_limit, delayed_queue_size;
@ -663,7 +664,7 @@ SHOW_COMP_OPTION have_openssl;
pthread_key(MEM_ROOT**,THR_MALLOC);
pthread_key(THD*, THR_THD);
mysql_mutex_t LOCK_thread_count;
mysql_mutex_t LOCK_thread_count, LOCK_thread_cache;
mysql_mutex_t
LOCK_status, LOCK_error_log, LOCK_short_uuid_generator,
LOCK_delayed_insert, LOCK_delayed_status, LOCK_delayed_create,
@ -761,7 +762,8 @@ PSI_mutex_key key_BINLOG_LOCK_index, key_BINLOG_LOCK_xid_list,
key_relay_log_info_log_space_lock, key_relay_log_info_run_lock,
key_relay_log_info_sleep_lock,
key_structure_guard_mutex, key_TABLE_SHARE_LOCK_ha_data,
key_LOCK_error_messages, key_LOG_INFO_lock, key_LOCK_thread_count,
key_LOCK_error_messages, key_LOG_INFO_lock,
key_LOCK_thread_count, key_LOCK_thread_cache,
key_PARTITION_LOCK_auto_inc;
PSI_mutex_key key_RELAYLOG_LOCK_index;
@ -832,6 +834,7 @@ static PSI_mutex_info all_server_mutexes[]=
{ &key_LOCK_commit_ordered, "LOCK_commit_ordered", PSI_FLAG_GLOBAL},
{ &key_LOG_INFO_lock, "LOG_INFO::lock", 0},
{ &key_LOCK_thread_count, "LOCK_thread_count", PSI_FLAG_GLOBAL},
{ &key_LOCK_thread_cache, "LOCK_thread_cache", PSI_FLAG_GLOBAL},
{ &key_PARTITION_LOCK_auto_inc, "HA_DATA_PARTITION::LOCK_auto_inc", 0}
};
@ -1472,7 +1475,7 @@ static void close_connections(void)
end_slave();
/* Give threads time to die. */
for (int i= 0; thread_count && i < 100; i++)
for (int i= 0; *(volatile int32*) &thread_count && i < 100; i++)
my_sleep(20000);
/*
@ -1886,6 +1889,7 @@ void clean_up(bool print_message)
sys_var_end();
my_atomic_rwlock_destroy(&global_query_id_lock);
my_atomic_rwlock_destroy(&thread_running_lock);
my_atomic_rwlock_destroy(&thread_count_lock);
my_atomic_rwlock_destroy(&statistics_lock);
mysql_mutex_lock(&LOCK_thread_count);
DBUG_PRINT("quit", ("got thread count lock"));
@ -1929,6 +1933,7 @@ static void clean_up_mutexes()
DBUG_ENTER("clean_up_mutexes");
mysql_rwlock_destroy(&LOCK_grant);
mysql_mutex_destroy(&LOCK_thread_count);
mysql_mutex_destroy(&LOCK_thread_cache);
mysql_mutex_destroy(&LOCK_status);
mysql_mutex_destroy(&LOCK_delayed_insert);
mysql_mutex_destroy(&LOCK_delayed_status);
@ -2455,6 +2460,28 @@ void dec_connection_count(THD *thd)
}
/*
Delete THD and decrement thread counters, including thread_running
*/
void delete_running_thd(THD *thd)
{
mysql_mutex_lock(&LOCK_thread_count);
thd->unlink();
mysql_mutex_unlock(&LOCK_thread_count);
delete thd;
dec_thread_running();
thread_safe_decrement32(&thread_count, &thread_count_lock);
if (!thread_count)
{
mysql_mutex_lock(&LOCK_thread_count);
mysql_cond_broadcast(&COND_thread_count);
mysql_mutex_unlock(&LOCK_thread_count);
}
}
/*
Unlink thd from global list of available connections and free thd
@ -2479,7 +2506,6 @@ void unlink_thd(THD *thd)
mysql_mutex_unlock(&LOCK_status);
mysql_mutex_lock(&LOCK_thread_count);
thread_count--;
thd->unlink();
/*
Used by binlog_reset_master. It would be cleaner to use
@ -2487,13 +2513,11 @@ void unlink_thd(THD *thd)
sync feature has been shut down at this point.
*/
DBUG_EXECUTE_IF("sleep_after_lock_thread_count_before_delete_thd", sleep(5););
/*
We must delete thd inside the lock to ensure that we don't start cleanup
before THD is deleted
*/
delete thd;
mysql_mutex_unlock(&LOCK_thread_count);
delete thd;
thread_safe_decrement32(&thread_count, &thread_count_lock);
DBUG_VOID_RETURN;
}
@ -2505,7 +2529,7 @@ void unlink_thd(THD *thd)
cache_thread()
NOTES
LOCK_thread_count has to be locked
LOCK_thread_cache has to be locked
RETURN
0 Thread was not put in cache
@ -2516,7 +2540,9 @@ void unlink_thd(THD *thd)
static bool cache_thread()
{
mysql_mutex_assert_owner(&LOCK_thread_count);
DBUG_ENTER("cache_thread");
mysql_mutex_assert_owner(&LOCK_thread_cache);
if (cached_thread_count < thread_cache_size &&
! abort_loop && !kill_cached_threads)
{
@ -2534,7 +2560,7 @@ static bool cache_thread()
#endif
while (!abort_loop && ! wake_thread && ! kill_cached_threads)
mysql_cond_wait(&COND_thread_cache, &LOCK_thread_count);
mysql_cond_wait(&COND_thread_cache, &LOCK_thread_cache);
cached_thread_count--;
if (kill_cached_threads)
mysql_cond_signal(&COND_flush_thread_cache);
@ -2569,10 +2595,10 @@ static bool cache_thread()
thd->thr_create_utime= microsecond_interval_timer();
thd->start_utime= thd->thr_create_utime;
threads.append(thd);
return(1);
DBUG_RETURN(1);
}
}
return(0);
DBUG_RETURN(0);
}
@ -2603,17 +2629,26 @@ bool one_thread_per_connection_end(THD *thd, bool put_in_cache)
set_current_thd(0);
if (put_in_cache)
{
mysql_mutex_lock(&LOCK_thread_count);
mysql_mutex_lock(&LOCK_thread_cache);
put_in_cache= cache_thread();
mysql_mutex_unlock(&LOCK_thread_count);
mysql_mutex_unlock(&LOCK_thread_cache);
if (put_in_cache)
DBUG_RETURN(0); // Thread is reused
}
/* It's safe to broadcast outside a lock (COND... is not deleted here) */
DBUG_PRINT("signal", ("Broadcasting COND_thread_count"));
mysql_cond_broadcast(&COND_thread_count);
/*
It's safe to check for thread_count outside of the mutex
as we are only interested to see if it was counted to 0 by the
above unlink_thd() call. We should only signal COND_thread_count if
thread_count is likely to be 0. (false positives are ok)
*/
if (!thread_count)
{
mysql_mutex_lock(&LOCK_thread_count);
DBUG_PRINT("signal", ("Broadcasting COND_thread_count"));
mysql_cond_broadcast(&COND_thread_count);
mysql_mutex_unlock(&LOCK_thread_count);
}
DBUG_LEAVE; // Must match DBUG_ENTER()
my_thread_end();
@ -2624,15 +2659,17 @@ bool one_thread_per_connection_end(THD *thd, bool put_in_cache)
void flush_thread_cache()
{
mysql_mutex_lock(&LOCK_thread_count);
DBUG_ENTER("flush_thread_cache");
mysql_mutex_lock(&LOCK_thread_cache);
kill_cached_threads++;
while (cached_thread_count)
{
mysql_cond_broadcast(&COND_thread_cache);
mysql_cond_wait(&COND_flush_thread_cache, &LOCK_thread_count);
mysql_cond_wait(&COND_flush_thread_cache, &LOCK_thread_cache);
}
kill_cached_threads--;
mysql_mutex_unlock(&LOCK_thread_count);
mysql_mutex_unlock(&LOCK_thread_cache);
DBUG_VOID_RETURN;
}
@ -3973,6 +4010,7 @@ static int init_thread_environment()
{
DBUG_ENTER("init_thread_environment");
mysql_mutex_init(key_LOCK_thread_count, &LOCK_thread_count, MY_MUTEX_INIT_FAST);
mysql_mutex_init(key_LOCK_thread_cache, &LOCK_thread_cache, MY_MUTEX_INIT_FAST);
mysql_mutex_init(key_LOCK_status, &LOCK_status, MY_MUTEX_INIT_FAST);
mysql_mutex_init(key_LOCK_delayed_insert,
&LOCK_delayed_insert, MY_MUTEX_INIT_FAST);
@ -5363,7 +5401,7 @@ static void bootstrap(MYSQL_FILE *file)
thd->max_client_packet_length= thd->net.max_packet;
thd->security_ctx->master_access= ~(ulong)0;
thd->thread_id= thd->variables.pseudo_thread_id= thread_id++;
thread_count++;
thread_count++; // Safe as only one thread running
in_bootstrap= TRUE;
bootstrap_file=file;
@ -5444,54 +5482,69 @@ void handle_connection_in_main_thread(THD *thd)
void create_thread_to_handle_connection(THD *thd)
{
DBUG_ENTER("create_thread_to_handle_connection");
mysql_mutex_assert_owner(&LOCK_thread_count);
/* Check if we can get thread from the cache */
if (cached_thread_count > wake_thread)
{
/* Get thread from cache */
thread_cache.push_back(thd);
wake_thread++;
mysql_cond_signal(&COND_thread_cache);
}
else
{
char error_message_buff[MYSQL_ERRMSG_SIZE];
/* Create new thread to handle connection */
int error;
thread_created++;
threads.append(thd);
DBUG_PRINT("info",(("creating thread %lu"), thd->thread_id));
thd->prior_thr_create_utime= microsecond_interval_timer();
if ((error= mysql_thread_create(key_thread_one_connection,
&thd->real_id, &connection_attrib,
handle_one_connection,
(void*) thd)))
mysql_mutex_lock(&LOCK_thread_cache);
/* Recheck condition when we have the lock */
if (cached_thread_count > wake_thread)
{
/* purecov: begin inspected */
DBUG_PRINT("error",
("Can't create thread to handle request (error %d)",
error));
thread_count--;
thd->killed= KILL_CONNECTION; // Safety
mysql_mutex_unlock(&LOCK_thread_count);
mysql_mutex_lock(&LOCK_connection_count);
(*thd->scheduler->connection_count)--;
mysql_mutex_unlock(&LOCK_connection_count);
statistic_increment(aborted_connects,&LOCK_status);
/* Can't use my_error() since store_globals has not been called. */
my_snprintf(error_message_buff, sizeof(error_message_buff),
ER_THD(thd, ER_CANT_CREATE_THREAD), error);
net_send_error(thd, ER_CANT_CREATE_THREAD, error_message_buff, NULL);
close_connection(thd, ER_OUT_OF_RESOURCES);
mysql_mutex_lock(&LOCK_thread_count);
delete thd;
mysql_mutex_unlock(&LOCK_thread_count);
return;
/* purecov: end */
/* Get thread from cache */
thread_cache.push_back(thd);
wake_thread++;
mysql_cond_signal(&COND_thread_cache);
mysql_mutex_unlock(&LOCK_thread_cache);
DBUG_PRINT("info",("Thread created"));
DBUG_VOID_RETURN;
}
mysql_mutex_unlock(&LOCK_thread_cache);
}
char error_message_buff[MYSQL_ERRMSG_SIZE];
/* Create new thread to handle connection */
int error;
thread_created++;
threads.append(thd);
DBUG_PRINT("info",(("creating thread %lu"), thd->thread_id));
thd->prior_thr_create_utime= microsecond_interval_timer();
if ((error= mysql_thread_create(key_thread_one_connection,
&thd->real_id, &connection_attrib,
handle_one_connection,
(void*) thd)))
{
/* purecov: begin inspected */
DBUG_PRINT("error",
("Can't create thread to handle request (error %d)",
error));
thd->killed= KILL_CONNECTION; // Safety
mysql_mutex_unlock(&LOCK_thread_count);
mysql_mutex_lock(&LOCK_connection_count);
(*thd->scheduler->connection_count)--;
mysql_mutex_unlock(&LOCK_connection_count);
statistic_increment(aborted_connects,&LOCK_status);
/* Can't use my_error() since store_globals has not been called. */
my_snprintf(error_message_buff, sizeof(error_message_buff),
ER_THD(thd, ER_CANT_CREATE_THREAD), error);
net_send_error(thd, ER_CANT_CREATE_THREAD, error_message_buff, NULL);
close_connection(thd, ER_OUT_OF_RESOURCES);
mysql_mutex_lock(&LOCK_thread_count);
thd->unlink();
mysql_mutex_unlock(&LOCK_thread_count);
delete thd;
thread_safe_decrement32(&thread_count, &thread_count_lock);
return;
/* purecov: end */
}
mysql_mutex_unlock(&LOCK_thread_count);
DBUG_PRINT("info",("Thread created"));
DBUG_VOID_RETURN;
}
@ -5538,10 +5591,10 @@ static void create_new_thread(THD *thd)
mysql_mutex_unlock(&LOCK_connection_count);
thread_safe_increment32(&thread_count, &thread_count_lock);
/* Start a new thread to handle connection. */
mysql_mutex_lock(&LOCK_thread_count);
/*
The initialization of thread_id is done in create_embedded_thd() for
the embedded library.
@ -5549,8 +5602,6 @@ static void create_new_thread(THD *thd)
*/
thd->thread_id= thd->variables.pseudo_thread_id= thread_id++;
thread_count++;
MYSQL_CALLBACK(thd->scheduler, add_connection, (thd));
DBUG_VOID_RETURN;
@ -5758,20 +5809,6 @@ void handle_connections_sockets()
}
#endif /* HAVE_LIBWRAP */
{
size_socket dummyLen;
struct sockaddr_storage dummy;
dummyLen = sizeof(dummy);
if ( getsockname(new_sock,(struct sockaddr *)&dummy,
(SOCKET_SIZE_TYPE *)&dummyLen) < 0 )
{
sql_perror("Error on new connection socket");
(void) mysql_socket_shutdown(new_sock, SHUT_RDWR);
(void) closesocket(new_sock);
continue;
}
}
/*
** Don't allow too many connections
*/
@ -7402,6 +7439,7 @@ static int mysql_init_variables(void)
global_query_id= thread_id= 1L;
my_atomic_rwlock_init(&global_query_id_lock);
my_atomic_rwlock_init(&thread_running_lock);
my_atomic_rwlock_init(&thread_count_lock);
my_atomic_rwlock_init(&statistics_lock);
strmov(server_version, MYSQL_SERVER_VERSION);
threads.empty();
@ -8461,12 +8499,8 @@ void refresh_status(THD *thd)
/*
Set max_used_connections to the number of currently open
connections. Lock LOCK_thread_count out of LOCK_status to avoid
deadlocks. Status reset becomes not atomic, but status data is
not exact anyway.
connections. This is not perfect, but status data is not exact anyway.
*/
mysql_mutex_lock(&LOCK_thread_count);
max_used_connections= thread_count-delayed_insert_threads;
mysql_mutex_unlock(&LOCK_thread_count);
}

47
sql/mysqld.h
View file

@ -56,6 +56,7 @@ void kill_mysql(void);
void close_connection(THD *thd, uint sql_errno= 0);
void handle_connection_in_main_thread(THD *thd);
void create_thread_to_handle_connection(THD *thd);
void delete_running_thd(THD *thd);
void unlink_thd(THD *thd);
bool one_thread_per_connection_end(THD *thd, bool put_in_cache);
void flush_thread_cache();
@ -89,7 +90,6 @@ extern bool opt_ignore_builtin_innodb;
extern my_bool opt_character_set_client_handshake;
extern bool volatile abort_loop;
extern bool in_bootstrap;
extern uint volatile thread_count;
extern uint connection_count;
extern my_bool opt_safe_user_create;
extern my_bool opt_safe_show_db, opt_local_infile, opt_myisam_use_mmap;
@ -352,7 +352,8 @@ extern mysql_rwlock_t LOCK_system_variables_hash;
extern mysql_cond_t COND_thread_count;
extern mysql_cond_t COND_manager;
extern int32 thread_running;
extern my_atomic_rwlock_t thread_running_lock;
extern int32 thread_count;
extern my_atomic_rwlock_t thread_running_lock, thread_count_lock;
extern char *opt_ssl_ca, *opt_ssl_capath, *opt_ssl_cert, *opt_ssl_cipher,
*opt_ssl_key;
@ -479,42 +480,30 @@ inline void table_case_convert(char * name, uint length)
name, length, name, length);
}
inline ulong sql_rnd_with_mutex()
inline void thread_safe_increment32(int32 *value, my_atomic_rwlock_t *lock)
{
mysql_mutex_lock(&LOCK_thread_count);
ulong tmp=(ulong) (my_rnd(&sql_rand) * 0xffffffff); /* make all bits random */
mysql_mutex_unlock(&LOCK_thread_count);
return tmp;
my_atomic_rwlock_wrlock(lock);
(void) my_atomic_add32(value, 1);
my_atomic_rwlock_wrunlock(lock);
}
inline int32
inline void thread_safe_decrement32(int32 *value, my_atomic_rwlock_t *lock)
{
my_atomic_rwlock_wrlock(lock);
(void) my_atomic_add32(value, -1);
my_atomic_rwlock_wrunlock(lock);
}
inline void
inc_thread_running()
{
int32 num_thread_running;
my_atomic_rwlock_wrlock(&thread_running_lock);
num_thread_running= my_atomic_add32(&thread_running, 1);
my_atomic_rwlock_wrunlock(&thread_running_lock);
return (num_thread_running+1);
thread_safe_increment32(&thread_running, &thread_running_lock);
}
inline int32
inline void
dec_thread_running()
{
int32 num_thread_running;
my_atomic_rwlock_wrlock(&thread_running_lock);
num_thread_running= my_atomic_add32(&thread_running, -1);
my_atomic_rwlock_wrunlock(&thread_running_lock);
return (num_thread_running-1);
}
inline int32
get_thread_running()
{
int32 num_thread_running;
my_atomic_rwlock_wrlock(&thread_running_lock);
num_thread_running= my_atomic_load32(&thread_running);
my_atomic_rwlock_wrunlock(&thread_running_lock);
return num_thread_running;
thread_safe_decrement32(&thread_running, &thread_running_lock);
}
void set_server_version(void);

32
sql/sql_class.cc
View file

@ -349,29 +349,6 @@ void thd_set_thread_stack(THD *thd, char *stack_start)
thd->thread_stack= stack_start;
}
/**
Lock connection data for the set of connections this connection
belongs to
@param thd THD object
*/
void thd_lock_thread_count(THD *)
{
mysql_mutex_lock(&LOCK_thread_count);
}
/**
Lock connection data for the set of connections this connection
belongs to
@param thd THD object
*/
void thd_unlock_thread_count(THD *)
{
mysql_cond_broadcast(&COND_thread_count);
mysql_mutex_unlock(&LOCK_thread_count);
}
/**
Close the socket used by this connection
@ -947,7 +924,14 @@ THD::THD()
protocol_binary.init(this);
tablespace_op=FALSE;
tmp= sql_rnd_with_mutex();
/*
Initialize the random generator. We call my_rnd() without a lock as
it's not really critical if two threads modifies the structure at the
same time. We ensure that we have an unique number foreach thread
by adding the address of the stack.
*/
tmp= (ulong) (my_rnd(&sql_rand) * 0xffffffff);
my_rnd_init(&rand, tmp + (ulong) &rand, tmp + (ulong) ::global_query_id);
substitute_null_with_insert_id = FALSE;
thr_lock_info_init(&lock_info); /* safety: will be reset after start */

8
sql/sql_insert.cc
View file

@ -2038,9 +2038,9 @@ public:
thd.unlink(); // Must be unlinked under lock
my_free(thd.query());
thd.security_ctx->user= thd.security_ctx->host=0;
thread_count--;
delayed_insert_threads--;
mysql_mutex_unlock(&LOCK_thread_count);
thread_safe_decrement32(&thread_count, &thread_count_lock);
mysql_cond_broadcast(&COND_thread_count); /* Tell main we are ready */
}
@ -2175,9 +2175,9 @@ bool delayed_get_table(THD *thd, MDL_request *grl_protection_request,
{
if (!(di= new Delayed_insert()))
goto end_create;
mysql_mutex_lock(&LOCK_thread_count);
thread_count++;
mysql_mutex_unlock(&LOCK_thread_count);
thread_safe_increment32(&thread_count, &thread_count_lock);
/*
Annotating delayed inserts is not supported.
*/

5
sql/sql_parse.cc
View file

@ -645,9 +645,10 @@ end:
delete thd;
#ifndef EMBEDDED_LIBRARY
mysql_mutex_lock(&LOCK_thread_count);
thread_count--;
thread_safe_decrement32(&thread_count, &thread_count_lock);
in_bootstrap= FALSE;
mysql_mutex_lock(&LOCK_thread_count);
mysql_cond_broadcast(&COND_thread_count);
mysql_mutex_unlock(&LOCK_thread_count);
my_thread_end();

8
vio/vio.c
View file

@ -213,9 +213,7 @@ Vio *vio_new(my_socket sd, enum enum_vio_type type, uint flags)
if ((vio = (Vio*) my_malloc(sizeof(*vio),MYF(MY_WME))))
{
vio_init(vio, type, sd, 0, flags);
sprintf(vio->desc,
(vio->type == VIO_TYPE_SOCKET ? "socket (%d)" : "TCP/IP (%d)"),
vio->sd);
vio->desc= (vio->type == VIO_TYPE_SOCKET ? "socket" : "TCP/IP");
#if !defined(__WIN__)
#if !defined(NO_FCNTL_NONBLOCK)
/*
@ -257,7 +255,7 @@ Vio *vio_new_win32pipe(HANDLE hPipe)
if ((vio = (Vio*) my_malloc(sizeof(Vio),MYF(MY_WME))))
{
vio_init(vio, VIO_TYPE_NAMEDPIPE, 0, hPipe, VIO_LOCALHOST);
strmov(vio->desc, "named pipe");
vio->desc= "named pipe";
}
DBUG_RETURN(vio);
}
@ -282,7 +280,7 @@ Vio *vio_new_win32shared_memory(HANDLE handle_file_map, HANDLE handle_map,
vio->event_conn_closed= event_conn_closed;
vio->shared_memory_remain= 0;
vio->shared_memory_pos= handle_map;
strmov(vio->desc, "shared memory");
vio->desc= "shared memory";
}
DBUG_RETURN(vio);
}