79 lines
2.3 KiB
PHP
79 lines
2.3 KiB
PHP
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# include/wait_show_condition.inc
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#
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# SUMMARY
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#
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# Waits until the show statement ($show_statement) has at least within one of
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# the rows of the result set for the field ($field) a value which fulfils
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# a condition ($condition), or the operation times out.
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#
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#
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# USAGE
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#
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# let $show_statement= SHOW PROCESSLIST;
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# let $field= State;
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# let $condition= = 'Updating';
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# --source include/wait_show_condition.inc
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#
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# OR
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#
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# let $wait_timeout= 60; # Override default of 30 seconds with 60.
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# let $show_statement= SHOW PROCESSLIST;
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# let $field= State;
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# let $condition= = 'Updating';
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# --source include/wait_show_condition.inc
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#
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# Please do not use this use routine if you can replace the SHOW statement
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# with a select. In such a case include/wait_condition.inc is recommended.
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#
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# Created: 2009-02-18 mleich
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#
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let $max_run_time= 30;
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if ($wait_timeout)
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{
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let $max_run_time= $wait_timeout;
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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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# The smallest timespan till UNIX_TIMESTAMP() gets incremented is ~0 seconds.
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# We add one second to avoid the case that somebody measures timespans on a
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# real clock with fractions of seconds, detects that n seconds are sufficient,
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# assigns n to this routine and suffers because he sometimes gets n - 1
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# seconds in reality.
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inc $max_run_time;
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let $found= 0;
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let $max_end_time= `SELECT UNIX_TIMESTAMP() + $max_run_time`;
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while (`SELECT UNIX_TIMESTAMP() <= $max_end_time AND $found = 0`)
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{
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# Sleep a bit to avoid too heavy load.
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real_sleep 0.2;
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let $rowno= 1;
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let $process_result= 1;
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while (`SELECT $process_result = 1 AND $found = 0`)
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{
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let $field_value= query_get_value($show_statement, $field, $rowno);
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if (`SELECT '$field_value' $condition`)
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{
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let $found= 1;
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}
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if (`SELECT '$field_value' = 'No such row'`)
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{
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# We are behind the last row of the result set.
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let $process_result= 0;
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}
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inc $rowno;
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}
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}
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if (!$found)
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{
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echo # Timeout in include/wait_show_condition.inc for $wait_condition;
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echo # show_statement : $show_statement;
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echo # field : $field;
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echo # condition : $condition;
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echo # max_run_time : $max_run_time;
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}
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