Ticket #17462: 17462.diff

wp-includes/cache.php

@@ -172 +172 @@
  *
  * @since 2.6.0
  */
-function wp_cache_reset() {
+function wp_cache_reset( $group = '', $key = '' ) {
         global $wp_object_cache;
 
-        return $wp_object_cache->reset();
+        return $wp_object_cache->reset( $group, $key );
 }
 
 /**
@@ -390 +390 @@
          *
          * @since 3.0.0
          */
-        function reset() {
-                // Clear out non-global caches since the blog ID has changed.
-                foreach ( array_keys($this->cache) as $group ) {
-                        if ( !in_array($group, $this->global_groups) )
-                                unset($this->cache[$group]);
+        function reset( $group = '', $id = '' ) {
+                if ( ! empty( $group ) ) {
+                        if ( !empty( $id ) ) {
+                                // Clear out a particular key
+                                if ( isset( $this->cache[$group][$id] ) )
+                                        unset( $this->cache[$group][$id] );
+                        } else {
+                                // Clear out a particular group
+                                if ( isset( $this->cache[$group] ) )
+                                        unset( $this->cache[$group] );
+                        }
+                } else {
+                        // Clear out non-global caches since the blog ID has changed.
+                        foreach ( array_keys($this->cache) as $group ) {
+                                if ( !in_array($group, $this->global_groups) )
+                                        unset($this->cache[$group]);
+                        }
                 }
         }
 

wp-includes/cron.php

@@ -204 +204 @@
         * 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 + 60 > $local_time )
                 return;
 
         //sanity check
@@ -227 +227 @@
                         return;
 
                 set_transient( 'doing_cron', $local_time );
+                $lock = $local_time;
 
                 ob_start();
                 wp_redirect( add_query_arg('doing_wp_cron', '', stripslashes($_SERVER['REQUEST_URI'])) );
@@ -241 +242 @@
         }
 
         set_transient( 'doing_cron', $local_time );
+        $lock = $local_time;
 
-        $cron_url = get_option( 'siteurl' ) . '/wp-cron.php?doing_wp_cron';
+        $cron_url = get_option( 'siteurl' ) . '/wp-cron.php?lock=' . $lock;
         wp_remote_post( $cron_url, array('timeout' => 0.01, 'blocking' => false, 'sslverify' => apply_filters('https_local_ssl_verify', true)) );
 }
 

wp-cron.php

@@ -26 +26 @@
         require_once('./wp-load.php');
 }
 
+// Uncached doing_cron transient fetch
+function _get_cron_lock() {
+        global $_wp_using_ext_object_cache, $wpdb;
+
+        $value = 0;
+        if ( $_wp_using_ext_object_cache ) {
+                // Clear the internal cache for the doing_cron transient to force a cache refresh
+                if ( function_exists( 'wp_cache_reset' ) )
+                        wp_cache_reset( 'transient', 'doing_cron' );
+                $value = wp_cache_get( $transient, 'transient' );
+        } 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();
 
+// Use global $lock otherwise GET lock.
+if ( empty( $lock ) ) {
+        if ( empty( $_GET[ 'lock' ] ) )
+                return;
+        $lock = $_GET[ 'lock' ];
+}
+
 $keys = array_keys( $crons );
 $local_time = time();
 
 if ( isset($keys[0]) && $keys[0] > $local_time )
         die();
 
+// Check lock
+if ( get_transient( 'doing_cron') != $lock )
+        return;
+
 foreach ($crons as $timestamp => $cronhooks) {
         if ( $timestamp > $local_time )
                 break;
@@ -53 +83 @@
                         wp_unschedule_event($timestamp, $hook, $v['args']);
 
                         do_action_ref_array($hook, $v['args']);
+
+                        // Has another cron process grabbed the lock?
+                        if ( _get_cron_lock() != $lock )
+                                return;
                 }
         }
 }