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