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;;;; -*- Mode: Lisp; indent-tabs-mode: nil -*-
;;;
;;; misc.lisp --- Various helper functions.
;;;
;;; Copyright (C) 2006-2007, Stelian Ionescu <stelian.ionescu-zeus@poste.it>
;;;
;;; Permission is hereby granted, free of charge, to any person
;;; obtaining a copy of this software and associated documentation
;;; files (the "Software"), to deal in the Software without
;;; restriction, including without limitation the rights to use, copy,
;;; modify, merge, publish, distribute, sublicense, and/or sell copies
;;; of the Software, and to permit persons to whom the Software is
;;; furnished to do so, subject to the following conditions:
;;;
;;; The above copyright notice and this permission notice shall be
;;; included in all copies or substantial portions of the Software.
;;;
;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
;;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
;;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
;;; NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
;;; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
;;; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
;;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
;;; DEALINGS IN THE SOFTWARE.
(in-package #:osicat-posix)
;;;; Misc
(defun fd-open-p (fd)
(handler-case
(progn (fstat fd) t)
(ebadf () nil)))
(defmacro repeat-upon-condition ((&rest conditions) &body body)
(with-unique-names (block-name)
`(loop :named ,block-name :do
(ignore-some-conditions ,conditions
(return-from ,block-name (progn ,@body))))))
(defmacro repeat-upon-eintr (&body body)
`(repeat-upon-condition (eintr) ,@body))
(defmacro repeat-decreasing-timeout
((timeout-var timeout &optional (block-name nil blockp)) &body body)
(unless (find timeout-var (flatten body))
(warn "You probably want to use ~S inside the body ~A" timeout-var body))
(unless blockp (setf block-name (gensym "BLOCK")))
(with-unique-names (deadline temp-timeout)
`(let* ((,timeout-var ,timeout)
(,deadline (when ,timeout-var
(+ ,timeout-var (get-monotonic-time)))))
(loop :named ,block-name :do
,@body
(when ,deadline
(let ((,temp-timeout (- ,deadline (get-monotonic-time))))
(setf ,timeout-var
(if (plusp ,temp-timeout)
,temp-timeout
0))))))))
(defmacro repeat-upon-condition-decreasing-timeout
(((&rest conditions) timeout-var timeout &optional (block-name nil blockp)) &body body)
(unless blockp (setf block-name (gensym "BLOCK")))
`(repeat-decreasing-timeout (,timeout-var ,timeout ,block-name)
(ignore-some-conditions ,conditions
(return-from ,block-name (progn ,@body)))))
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