1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
# name : status_wait_query_cache_mutex.patch
# introduced : 12
# maintainer : Oleg
#
#!!! notice !!!
# Any small change to this file in the main branch
# should be done or reviewed by the maintainer!
diff -Nur a/patch_info/status_wait_query_cache_mutex.info b/patch_info/status_wait_query_cache_mutex.info
--- a/patch_info/status_wait_query_cache_mutex.info 1970-01-01 03:00:00.000000000 +0300
+++ b/patch_info/status_wait_query_cache_mutex.info 2010-07-21 01:42:09.650424002 +0400
@@ -0,0 +1,7 @@
+File=status_wait_query_cache_mutex.patch
+Name=Add new status - Waiting on query cache mutex
+Version=1.0
+Author=Percona <info@percona.com>
+License=GPL
+Comment=
+2010-07 - First version avaliable
diff -Nur a/sql/sql_cache.cc b/sql/sql_cache.cc
--- a/sql/sql_cache.cc 2010-07-21 01:37:51.190424002 +0400
+++ b/sql/sql_cache.cc 2010-07-22 14:55:17.930424002 +0400
@@ -609,7 +609,13 @@
bool interrupt= FALSE;
DBUG_ENTER("Query_cache::try_lock");
+ THD *thd = current_thd;
+ const char* old_proc_info= thd->proc_info;
+ thd_proc_info(thd,"Waiting on query cache mutex");
pthread_mutex_lock(&structure_guard_mutex);
+ DBUG_EXECUTE_IF("status_wait_query_cache_mutex_sleep", {
+ sleep(5);
+ });
while (1)
{
if (m_cache_lock_status == Query_cache::UNLOCKED)
@@ -657,6 +663,7 @@
}
}
pthread_mutex_unlock(&structure_guard_mutex);
+ thd->proc_info = old_proc_info;
DBUG_RETURN(interrupt);
}
|