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Fix pool_of_threads test case

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This commit is contained in:
Vladislav Vaintroub
2011-12-18 23:03:35 +01:00
parent a5a22e9f64
commit 2e4bde4c0f
4 changed files with 23 additions and 11 deletions
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4
mysql-test/r/pool_of_threads.result
View File

@@ -2084,7 +2084,7 @@ fld6 char(4) latin1_swedish_ci NO #
show full columns from t2 from test like 's%';
Field Type Collation Null Key Default Extra Privileges Comment
show keys from t2;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t2 0 PRIMARY 1 auto A 1199 NULL NULL BTREE
t2 0 fld1 1 fld1 A 1199 NULL NULL BTREE
t2 1 fld3 1 fld3 A NULL NULL NULL BTREE
@@ -2153,7 +2153,7 @@ Warning 1052 Column 'kundentyp' in group statement is ambiguous
drop table t1;
SELECT sleep(5);
SELECT sleep(5);
# -- Success: more than --thread-pool-size normal connections not possible
# -- Success: more than --thread_pool_max_threads normal connections not possible
sleep(5)
0
sleep(5)

3
mysql-test/t/pool_of_threads.cnf
View File

@@ -2,7 +2,8 @@
[mysqld.1]
loose-thread-handling= pool-of-threads
loose-thread_pool_size= 2
loose-thread_pool_size= 1
loose-thread_pool_max_threads= 2
extra-port= @ENV.MASTER_EXTRA_PORT
extra-max-connections=1

6
mysql-test/t/pool_of_threads.test
View File

@@ -13,7 +13,7 @@
# connections on the extra port.
# First set two connections running, and check that extra connection
# on normal port fails due to--thread-pool-size=2
# on normal port fails due to--thread-pool-max_threads=2
connection default;
send SELECT sleep(5);
@@ -32,11 +32,11 @@ connect(con3,localhost,root,,);
let $error = $mysql_errno;
if (!$error)
{
--echo # -- Error: managed to establish more than --thread-pool-size connections
--echo # -- Error: managed to establish more than --thread_pool_max_threads connections
}
if ($error)
{
--echo # -- Success: more than --thread-pool-size normal connections not possible
--echo # -- Success: more than --thread_pool_max_threads normal connections not possible
}
connection default;

15
sql/threadpool_unix.cc
View File

@@ -624,14 +624,22 @@ static pool_event_t * listener(worker_thread_t *current_thread,
/* Creates a new worker thread. thread_mutex must be held when calling this function */
/*
Creates a new worker thread.
thread_mutex must be held when calling this function
NOTE: in rare cases, the number of threads can exceed
threadpool_max_threads, because we need at least 2 threads
per group to prevent deadlocks (one listener + one worker)
*/
static int create_worker(thread_group_t *thread_group)
{
pthread_t thread_id;
int err;
DBUG_ENTER("create_worker");
if (tp_stats.num_worker_threads >= (int)threadpool_max_threads)
if (tp_stats.num_worker_threads >= (int)threadpool_max_threads
&& thread_group->thread_count >= 2)
{
DBUG_PRINT("info",
("Cannot create new thread (maximum allowed threads reached)"));
@@ -667,6 +675,9 @@ static int wake_or_create_thread(thread_group_t *thread_group)
if (thread_group->pending_thread_start_count > 0)
DBUG_RETURN(-1);
if (thread_group->thread_count > thread_group->connection_count)
DBUG_RETURN(-1);
if (thread_group->thread_count < 4)
{
DBUG_RETURN(create_worker(thread_group));