X-Git-Url: https://scripts.mit.edu/gitweb/autoinstalls/wordpress.git/blobdiff_plain/fa11948979fd6a4ea5705dc613b239699a459db3..refs/tags/wordpress-4.3:/wp-cron.php

diff --git a/wp-cron.php b/wp-cron.php
index da2838cb..15c6676b 100644
--- a/wp-cron.php
+++ b/wp-cron.php
@@ -26,14 +26,25 @@ if ( !defined('ABSPATH') ) {
 	require_once( dirname( __FILE__ ) . '/wp-load.php' );
 }
 
-// Uncached doing_cron transient fetch
+/**
+ * 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 refetch of doing_cron transient in case
-		// another processs updated the 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' ) );
@@ -53,7 +64,9 @@ $gmt_time = microtime( true );
 if ( isset($keys[0]) && $keys[0] > $gmt_time )
 	die();
 
-$doing_cron_transient = get_transient( 'doing_cron');
+
+// The cron lock: a unix timestamp from when the cron was spawned.
+$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 ) ) {
@@ -68,7 +81,10 @@ if ( empty( $doing_wp_cron ) ) {
 	}
 }
 
-// Check lock
+/*
+ * The cron lock (a unix timestamp set when the cron was spawned),
+ * must match $doing_wp_cron (the "key").
+ */
 if ( $doing_cron_transient != $doing_wp_cron )
 	return;
 
@@ -92,10 +108,11 @@ foreach ( $crons as $timestamp => $cronhooks ) {
 			/**
 			 * Fires scheduled events.
 			 *
+			 * @ignore
 			 * @since 2.1.0
 			 *
 			 * @param string $hook Name of the hook that was scheduled to be fired.
-			 * @param array $v['args'] The arguments to be passed to the hook.
+			 * @param array  $args The arguments to be passed to the hook.
 			 */
  			do_action_ref_array( $hook, $v['args'] );