diff options
Diffstat (limited to 'mysql-test/include/wait_until_count_sessions.inc')
| -rw-r--r-- | mysql-test/include/wait_until_count_sessions.inc | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/mysql-test/include/wait_until_count_sessions.inc b/mysql-test/include/wait_until_count_sessions.inc new file mode 100644 index 00000000..245fb68b --- /dev/null +++ b/mysql-test/include/wait_until_count_sessions.inc @@ -0,0 +1,127 @@ +# 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 +} + |