io-multiplex/utils.lisp

   1 ;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Indent-tabs-mode: NIL -*-
   2 ;;;
   3 ;;; utils.lisp --- Miscellaneous utilities.
   4 ;;;
   5 ;;; Copyright (C) 2006-2007, Stelian Ionescu  <sionescu@common-lisp.net>
   6 ;;;
   7 ;;; This code is free software; you can redistribute it and/or
   8 ;;; modify it under the terms of the version 2.1 of
   9 ;;; the GNU Lesser General Public License as published by
  10 ;;; the Free Software Foundation, as clarified by the
  11 ;;; preamble found here:
  12 ;;;     http://opensource.franz.com/preamble.html
  13 ;;;
  14 ;;; This program is distributed in the hope that it will be useful,
  15 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;;; GNU General Public License for more details.
  18 ;;;
  19 ;;; You should have received a copy of the GNU Lesser General
  20 ;;; Public License along with this library; if not, write to the
  21 ;;; Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
  22 ;;; Boston, MA 02110-1301, USA
  23
  24 (in-package :io.multiplex)
  25
  26 #-windows
  27 (defun timeout->timeval (timeout tv)
  28   (with-foreign-slots ((nix::sec nix::usec) tv nix::timeval)
  29     (multiple-value-bind (sec usec) (decode-timeout timeout)
  30      (setf nix::sec  sec
  31            nix::usec usec))))
  32
  33 #-windows
  34 (defun timeout->timespec (timeout ts)
  35   (with-foreign-slots ((nix::sec nix::nsec) ts nix::timespec)
  36     (multiple-value-bind (sec usec) (decode-timeout timeout)
  37       (setf nix::sec sec
  38             nix::nsec (* 1000 usec)))))
  39
  40 (defun timeout->milisec (timeout)
  41   (if timeout
  42       (multiple-value-bind (sec usec) (decode-timeout timeout)
  43         (+ (* sec 1000)
  44            (truncate usec 1000)))
  45       -1))
  46
  47 (defmacro flags-case (mask &body clauses)
  48   (once-only (mask)
  49     `(progn ,@(loop :for clause :in clauses
  50                  :collect `(when (logtest ,(let ((flags (first clause)))
  51                                                 (if (listp flags)
  52                                                     `(logior ,@flags)
  53                                                     flags))
  54                                           ,mask)
  55                              ,(second clause))))))
  56
  57 (defmacro ignore-and-print-errors (&body body)
  58   `(handler-case (progn ,@body)
  59      (error (error)
  60        (warn "Caught a ~A: ~A, ignoring it."
  61              (type-of error) error))))