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