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Editing: wp-mutex.php

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<?php

if ( ! class_exists( 'WPMutex' ) ) :

class WPMutex {
		/**
		 * Get an exclusive named lock.
		 *
		 * @param string $name
		 * @param integer $timeout
		 * @param bool $network_wide
		 * @return bool
		 */
		static function acquire( $name, $timeout = 0, $network_wide = false ) {
			global $wpdb; /* @var wpdb $wpdb */
			if ( ! $network_wide ) {
				$name = WPMutex::_get_private_name( $name );
			}
			$state = $wpdb->get_var( $wpdb->prepare( 'SELECT GET_LOCK(%s, %d)', $name, $timeout ) );
			return 1 == $state;
		}

/**
		 * Release a named lock.
		 *
		 * @param string $name
		 * @param bool $network_wide
		 * @return bool
		 */
		static function release( $name, $network_wide = false ) {
			global $wpdb; /* @var wpdb $wpdb */
			if ( ! $network_wide ) {
				$name = WPMutex::_get_private_name( $name );
			}
			$released = $wpdb->get_var( $wpdb->prepare( 'SELECT RELEASE_LOCK(%s)', $name ) );
			return 1 == $released;
		}

/**
		 * Given a generic lock name, create a new one that's unique to the current blog.
		 *
		 * @access private
		 *
		 * @param string $name
		 * @return string
		 */
		static function _get_private_name( $name ) {
			global $current_blog;
			if ( function_exists( 'is_multisite' ) && is_multisite() && isset( $current_blog->blog_id ) ) {
				$name .= '-blog-' . $current_blog->blog_id;
			}
			return $name;
		}
	}

endif;

Editing: wp-mutex.php

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