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Improve cron locking. Avoid multiple cron processes looping over the same events. fixes #17462

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git-svn-id: https://develop.svn.wordpress.org/trunk@18659 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Ryan Boren
2011-09-09 19:59:44 +00:00
parent d893b9568c
commit 332d6d1351
4 changed files with 71 additions and 17 deletions
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wp-includes/cron.php
+10 -8
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@@ -204,13 +204,13 @@ function spawn_cron( $local_time = 0 ) {
* multiple processes on multiple web servers can run this code concurrently
* try to make this as atomic as possible by setting doing_cron switch
*/
$flag = get_transient('doing_cron');
$lock = get_transient('doing_cron');
if ( $flag > $local_time + 10*60 )
$flag = 0;
if ( $lock > $local_time + 10*60 )
$lock = 0;
// don't run if another process is currently running it or more than once every 60 sec.
if ( $flag + 60 > $local_time )
if ( $lock + WP_CRON_LOCK_TIMEOUT > $local_time )
return;
//sanity check
@@ -226,10 +226,11 @@ function spawn_cron( $local_time = 0 ) {
if ( !empty($_POST) || defined('DOING_AJAX') )
return;
set_transient( 'doing_cron', $local_time );
$doing_wp_cron = $local_time;
set_transient( 'doing_cron', $doing_wp_cron );
ob_start();
wp_redirect( add_query_arg('doing_wp_cron', '', stripslashes($_SERVER['REQUEST_URI'])) );
wp_redirect( add_query_arg('doing_wp_cron', $doing_wp_cron, stripslashes($_SERVER['REQUEST_URI'])) );
echo ' ';
// flush any buffers and send the headers
@@ -240,9 +241,10 @@ function spawn_cron( $local_time = 0 ) {
return;
}
set_transient( 'doing_cron', $local_time );
$doing_wp_cron = $local_time;
set_transient( 'doing_cron', $doing_wp_cron );
$cron_url = get_option( 'siteurl' ) . '/wp-cron.php?doing_wp_cron';
$cron_url = get_option( 'siteurl' ) . '/wp-cron.php?doing_wp_cron=' . $doing_wp_cron;
wp_remote_post( $cron_url, array('timeout' => 0.01, 'blocking' => false, 'sslverify' => apply_filters('https_local_ssl_verify', true)) );
}