<?php
/**
* WordPress Cron Implementation for hosts, which do not offer CRON or for which
- * the user has not setup a CRON job pointing to this file.
+ * the user has not set up a CRON job pointing to this file.
*
* The HTTP request to this file will not slow down the visitor who happens to
* visit when the cron job is needed to run.
define('DOING_CRON', true);
if ( !defined('ABSPATH') ) {
- /** Setup WordPress environment */
- require_once('./wp-load.php');
+ /** Set up WordPress environment */
+ require_once( dirname( __FILE__ ) . '/wp-load.php' );
+}
+
+/**
+ * Retrieves the cron lock.
+ *
+ * Returns the uncached `doing_cron` transient.
+ *
+ * @ignore
+ * @since 3.3.0
+ *
+ * @return string|false Value of the `doing_cron` transient, 0|false otherwise.
+ */
+function _get_cron_lock() {
+ global $wpdb;
+
+ $value = 0;
+ if ( wp_using_ext_object_cache() ) {
+ /*
+ * Skip local cache and force re-fetch of doing_cron transient
+ * in case another process updated the cache.
+ */
+ $value = wp_cache_get( 'doing_cron', 'transient', true );
+ } else {
+ $row = $wpdb->get_row( $wpdb->prepare( "SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", '_transient_doing_cron' ) );
+ if ( is_object( $row ) )
+ $value = $row->option_value;
+ }
+
+ return $value;
}
if ( false === $crons = _get_cron_array() )
die();
$keys = array_keys( $crons );
-$local_time = time();
+$gmt_time = microtime( true );
-if ( isset($keys[0]) && $keys[0] > $local_time )
+if ( isset($keys[0]) && $keys[0] > $gmt_time )
die();
-foreach ($crons as $timestamp => $cronhooks) {
- if ( $timestamp > $local_time )
+$doing_cron_transient = get_transient( 'doing_cron');
+
+// Use global $doing_wp_cron lock otherwise use the GET lock. If no lock, trying grabbing a new lock.
+if ( empty( $doing_wp_cron ) ) {
+ if ( empty( $_GET[ 'doing_wp_cron' ] ) ) {
+ // Called from external script/job. Try setting a lock.
+ if ( $doing_cron_transient && ( $doing_cron_transient + WP_CRON_LOCK_TIMEOUT > $gmt_time ) )
+ return;
+ $doing_cron_transient = $doing_wp_cron = sprintf( '%.22F', microtime( true ) );
+ set_transient( 'doing_cron', $doing_wp_cron );
+ } else {
+ $doing_wp_cron = $_GET[ 'doing_wp_cron' ];
+ }
+}
+
+// Check lock
+if ( $doing_cron_transient != $doing_wp_cron )
+ return;
+
+foreach ( $crons as $timestamp => $cronhooks ) {
+ if ( $timestamp > $gmt_time )
break;
- foreach ($cronhooks as $hook => $keys) {
+ foreach ( $cronhooks as $hook => $keys ) {
- foreach ($keys as $k => $v) {
+ foreach ( $keys as $k => $v ) {
$schedule = $v['schedule'];
- if ($schedule != false) {
+ if ( $schedule != false ) {
$new_args = array($timestamp, $schedule, $hook, $v['args']);
call_user_func_array('wp_reschedule_event', $new_args);
}
- wp_unschedule_event($timestamp, $hook, $v['args']);
+ wp_unschedule_event( $timestamp, $hook, $v['args'] );
- do_action_ref_array($hook, $v['args']);
+ /**
+ * Fires scheduled events.
+ *
+ * @ignore
+ * @since 2.1.0
+ *
+ * @param string $hook Name of the hook that was scheduled to be fired.
+ * @param array $args The arguments to be passed to the hook.
+ */
+ do_action_ref_array( $hook, $v['args'] );
+
+ // If the hook ran too long and another cron process stole the lock, quit.
+ if ( _get_cron_lock() != $doing_wp_cron )
+ return;
}
}
}
+if ( _get_cron_lock() == $doing_wp_cron )
+ delete_transient( 'doing_cron' );
+
die();