io-multiplex/utils.lisp

   1 ;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp -*-
   2
   3 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
   4 ;   Copyright (C) 2006,2007 by Stelian Ionescu                            ;
   5 ;                                                                         ;
   6 ;   This program is free software; you can redistribute it and/or modify  ;
   7 ;   it under the terms of the GNU General Public License as published by  ;
   8 ;   the Free Software Foundation; either version 2 of the License, or     ;
   9 ;   (at your option) any later version.                                   ;
  10 ;                                                                         ;
  11 ;   This program is distributed in the hope that it will be useful,       ;
  12 ;   but WITHOUT ANY WARRANTY; without even the implied warranty of        ;
  13 ;   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         ;
  14 ;   GNU General Public License for more details.                          ;
  15 ;                                                                         ;
  16 ;   You should have received a copy of the GNU General Public License     ;
  17 ;   along with this program; if not, write to the                         ;
  18 ;   Free Software Foundation, Inc.,                                       ;
  19 ;   51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA              ;
  20 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  21
  22 (in-package :io.multiplex)
  23
  24 (defun timeout->timeval (timeout tv)
  25   (with-foreign-slots ((et:tv-sec et:tv-usec) tv et:timeval)
  26     (multiple-value-bind (sec usec) (decode-timeout timeout)
  27      (setf et:tv-sec  sec
  28            et:tv-usec usec))))
  29
  30
  31 (defun timeout->timespec (timeout ts)
  32   (with-foreign-slots ((et:ts-sec et:ts-nsec) ts et:timespec)
  33     (multiple-value-bind (sec usec) (decode-timeout timeout)
  34       (setf et:ts-sec sec
  35             et:ts-nsec (* 1000 usec)))))
  36
  37
  38 (defmacro flags-case (mask &body clauses)
  39   (let ((newm (gensym "MASK")))
  40     `(let ((,newm ,mask))
  41        (cond ,@(loop :for clause :in clauses
  42                   :collect `((logtest ,(let ((flags (first clause)))
  43                                             (if (listp flags)
  44                                                 `(logand ,@flags)
  45                                                 flags))
  46                                       ,newm)
  47                              ,(second clause)))))))
  48
  49
  50 (defmacro ignore-and-print-errors (&body body)
  51   `(handler-case (progn ,@body)
  52      (error (error)
  53        (warn "Caught a ~A: ~A, ignoring it."
  54              (type-of error) error))))
  55
  56
  57 ;; (defmacro with-restart-on-eintr (&body body)
  58 ;;   `(loop :for exit-p
  59 ;;       :while (not exit-p) :do
  60 ;;       (handler-case
  61 ;;           (progn ,@body)
  62 ;;         (et:unix-error-intr (err)
  63 ;;           (declare (ignore err))
  64 ;;           (setf exit-p t)))))