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# include/wait_until_count_sessions.inc
#
# SUMMARY
#
# Waits until the passed number ($count_sessions) of concurrent sessions or
# a smaller number was observed via
# SHOW STATUS LIKE 'Threads_connected'
# or the operation times out.
# Note:
# 1. We wait for $current_sessions <= $count_sessions because in the use case
# with count_sessions.inc before and wait_until_count_sessions.inc after
# the core of the test it could happen that the disconnects of sessions
# belonging to the preceding test are not finished.
# sessions at test begin($count_sessions) = m + n
# sessions of the previous test which will be soon disconnected = n (n >= 0)
# sessions at test end ($current sessions, assuming the test disconnects
# all additional sessions) = m
# 2. Starting with 5.1 we could also use
# SELECT COUNT(*) FROM information_schema.processlist
# I stay with "SHOW STATUS LIKE 'Threads_connected'" because this
# runs in all versions 5.0+
#
#
# USAGE
#
# let $count_sessions= 3;
# --source include/wait_until_count_sessions.inc
#
# OR typical example of a test which uses more than one session
# Such a test could harm successing tests if there is no server shutdown
# and start between.
#
# If the testing box is slow than the disconnect of sessions belonging to
# the current test might happen when the successing test gets executed.
# This means the successing test might see activities like unexpected
# rows within the general log or the PROCESSLIST.
# Example from bug http://bugs.mysql.com/bug.php?id=40377
# --- bzr_mysql-6.0-rpl/.../r/log_state.result
# +++ bzr_mysql-6.0-rpl/.../r/log_state.reject
# @@ -25,6 +25,7 @@
# event_time user_host ... command_type argument
# TIMESTAMP USER_HOST ... Query create table t1(f1 int)
# TIMESTAMP USER_HOST ... Query select * from mysql.general_log
# +TIMESTAMP USER_HOST ... Quit
# ....
#
# What to do?
# -----------
# <start of test>
# # Determine initial number of connections (set $count_sessions)
# --source include/count_sessions.inc
# ...
# connect (con1,.....)
# ...
# connection default;
# ...
# disconnect con1;
# ...
# # Wait until we have reached the initial number of connections
# # or more than the sleep time above (10 seconds) has passed.
# # $count_sessions
# --source include/wait_until_count_sessions.inc
# <end of test>
#
# Important note about tests with unfortunate (= not cooperative
# to successing tests) architecture:
# connection con1;
# send SELECT ..., sleep(10)
# connection default;
# ...
# disconnect con1;
# <end of test>
# should be fixed by
# connection con1;
# send SELECT ..., sleep(10)
# connection default;
# ...
# connect con1;
# reap;
# connection default;
# disconnect con1;
# <end of test>
# and not only by appending include/wait_until_count_sessions.inc etc.
#
#
# EXAMPLE
#
# backup.test, grant3.test
#
#
# Created:
# 2009-01-14 mleich
# Modified:
# 2009-02-24 mleich Fix Bug#43114 wait_until_count_sessions too restrictive,
# random PB failures
#
let $wait_counter= 100;
if ($wait_timeout)
{
let $wait_counter= `SELECT $wait_timeout * 10`;
}
# Reset $wait_timeout so that its value won't be used on subsequent
# calls, and default will be used instead.
let $wait_timeout= 0;
while ($wait_counter)
{
let $current_sessions= query_get_value(SHOW STATUS LIKE 'Threads_connected', Value, 1);
let $success= `SELECT $current_sessions <= $count_sessions`;
if ($success)
{
let $wait_counter= 0;
}
if (!$success)
{
real_sleep 0.1;
dec $wait_counter;
}
}
if (!$success)
{
--echo # Timeout in wait_until_count_sessions.inc
--echo # Number of sessions expected: <= $count_sessions found: $current_sessions
SHOW PROCESSLIST;
--die Timeout in wait_until_count_sessions.inc
}
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