bk commit into 5.0 tree (kroki:1.2135) BUG#15933

[kroki]

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5.0 repository of tomash. When tomash does a push these changes will
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ChangeSet
  1.2135 06/04/12 17:37:57 kroki@stripped +2 -0
  In test for bug#15933 we have to wait for all disconnects to finish to avoid
  a race between updating and checking Max_used_connections.  This is done in
  a loop until either disconnect finished or timeout expired.  In a latter case
  the test will fail.

  mysql-test/t/status.test
    1.15 06/04/12 17:37:51 kroki@stripped +51 -14
    Close extra conections in previous test.
    In test for bug#15933 we have to wait for all disconnects to finish to avoid
    a race between updating and checking Max_used_connections.  This is done in
    a loop until either disconnect finished or timeout expired.  In a latter case
    the test will fail.
    Use con1, con2, con3 instead of con3, con4, con5.

  mysql-test/r/status.result
    1.10 06/04/12 17:37:50 kroki@stripped +5 -5
    Update result to match changes in test case.

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	kroki
# Host:	moonlight.intranet
# Root:	/home/tomash/src/mysql_ab/mysql-5.0-bug15933

--- 1.9/mysql-test/r/status.result	2006-04-07 15:30:31 +04:00
+++ 1.10/mysql-test/r/status.result	2006-04-12 17:37:50 +04:00
@@ -26,20 +26,20 @@
 FLUSH STATUS;
 SHOW STATUS LIKE 'max_used_connections';
 Variable_name	Value
-Max_used_connections	3
+Max_used_connections	1
 SET @save_thread_cache_size=@@thread_cache_size;
 SET GLOBAL thread_cache_size=3;
 SHOW STATUS LIKE 'max_used_connections';
 Variable_name	Value
-Max_used_connections	5
+Max_used_connections	3
 FLUSH STATUS;
 SHOW STATUS LIKE 'max_used_connections';
 Variable_name	Value
-Max_used_connections	4
+Max_used_connections	2
 SHOW STATUS LIKE 'max_used_connections';
 Variable_name	Value
-Max_used_connections	5
+Max_used_connections	3
 SHOW STATUS LIKE 'max_used_connections';
 Variable_name	Value
-Max_used_connections	6
+Max_used_connections	4
 SET GLOBAL thread_cache_size=@save_thread_cache_size;

--- 1.14/mysql-test/t/status.test	2006-04-07 15:30:32 +04:00
+++ 1.15/mysql-test/t/status.test	2006-04-12 17:37:51 +04:00
@@ -36,6 +36,10 @@
 show status like 'Table_lock%';
 drop table t1;
 
+disconnect con2;
+disconnect con1;
+connection default;
+
 # End of 4.1 tests
 
 #
@@ -60,48 +64,81 @@
 #   taking a thread from the cache as well as when creating new threads
 #
 
-# Previous test uses con1, con2.  If we disconnect them, there will be
-# a race on when exactly this will happen, so we better leave them as
-# is.
-connection default;
+# Wait for at most $disconnect_timeout seconds for disconnects to finish.
+let $disconnect_timeout = 10;
 
-# Reset max_used_connections from previous tests.
+# Wait for any previous disconnects to finish.
 FLUSH STATUS;
+--disable_query_log
+--disable_result_log
+eval SET @wait_left = $disconnect_timeout;
+let $max_used_connections = `SHOW STATUS LIKE 'max_used_connections'`;
+eval SET @max_used_connections = SUBSTRING('$max_used_connections', 21)+0;
+let $wait_more = `SELECT @max_used_connections != 1 && @wait_left > 0`;
+while ($wait_more)
+{
+  sleep 1;
+  FLUSH STATUS;
+  SET @wait_left = @wait_left - 1;
+  let $max_used_connections = `SHOW STATUS LIKE 'max_used_connections'`;
+  eval SET @max_used_connections = SUBSTRING('$max_used_connections', 21)+0;
+  let $wait_more = `SELECT @max_used_connections != 1 && @wait_left > 0`;
+}
+--enable_query_log
+--enable_result_log
+
+# Prerequisite.
 SHOW STATUS LIKE 'max_used_connections';
 
 # Save original setting.
 SET @save_thread_cache_size=@@thread_cache_size;
 SET GLOBAL thread_cache_size=3;
 
-connect (con3,localhost,root,,);
-connect (con4,localhost,root,,);
+connect (con1,localhost,root,,);
+connect (con2,localhost,root,,);
 
-connection con3;
-disconnect con4;
+connection con1;
+disconnect con2;
 
 # Check that max_used_connections still reflects maximum value.
 SHOW STATUS LIKE 'max_used_connections';
 
 # Check that after flush max_used_connections equals to current number
-# of connections.
+# of connections.  First wait for previous disconnect to finish.
 FLUSH STATUS;
+--disable_query_log
+--disable_result_log
+eval SET @wait_left = $disconnect_timeout;
+let $max_used_connections = `SHOW STATUS LIKE 'max_used_connections'`;
+eval SET @max_used_connections = SUBSTRING('$max_used_connections', 21)+0;
+let $wait_more = `SELECT @max_used_connections != 2 && @wait_left > 0`;
+while ($wait_more)
+{
+  sleep 1;
+  FLUSH STATUS;
+  SET @wait_left = @wait_left - 1;
+  let $max_used_connections = `SHOW STATUS LIKE 'max_used_connections'`;
+  eval SET @max_used_connections = SUBSTRING('$max_used_connections', 21)+0;
+  let $wait_more = `SELECT @max_used_connections != 2 && @wait_left > 0`;
+}
+--enable_query_log
+--enable_result_log
+# Check that we don't count disconnected thread any longer.
 SHOW STATUS LIKE 'max_used_connections';
 
 # Check that max_used_connections is updated when cached thread is
 # reused...
-connect (con4,localhost,root,,);
+connect (con2,localhost,root,,);
 SHOW STATUS LIKE 'max_used_connections';
 
 # ...and when new thread is created.
-connect (con5,localhost,root,,);
+connect (con3,localhost,root,,);
 SHOW STATUS LIKE 'max_used_connections';
 
 # Restore original setting.
 connection default;
 SET GLOBAL thread_cache_size=@save_thread_cache_size;
 
-disconnect con5;
-disconnect con4;
 disconnect con3;
 disconnect con2;
 disconnect con1;