WP_Upgrader::create_lock( string $lock_name, int $release_timeout = null ): bool

Source

public static function create_lock( $lock_name, $release_timeout = null ) {
	global $wpdb;
	if ( ! $release_timeout ) {
		$release_timeout = HOUR_IN_SECONDS;
	}
	$lock_option = $lock_name . '.lock';

	// Try to lock.
	$lock_result = $wpdb->query( $wpdb->prepare( "INSERT IGNORE INTO `$wpdb->options` ( `option_name`, `option_value`, `autoload` ) VALUES (%s, %s, 'off') /* LOCK */", $lock_option, time() ) );

	if ( ! $lock_result ) {
		$lock_result = get_option( $lock_option );

		// If a lock couldn't be created, and there isn't a lock, bail.
		if ( ! $lock_result ) {
			return false;
		}

		// Check to see if the lock is still valid. If it is, bail.
		if ( $lock_result > ( time() - $release_timeout ) ) {
			return false;
		}

		// There must exist an expired lock, clear it and re-gain it.
		WP_Upgrader::release_lock( $lock_name );

		return WP_Upgrader::create_lock( $lock_name, $release_timeout );
	}

	// Update the lock, as by this point we've definitely got a lock, just need to fire the actions.
	update_option( $lock_option, time() );

	return true;
}

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