kc3-lang/automake/interlock

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  Commit

• Hash : 4c809afe
  Author :
  Date : 1996-08-11T18:02:21
  

  Better C++ support
  

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• interlock

• #! /bin/sh
  # interlock - wrap program invocation in lock to allow
  #             parallel builds to work.
  # Written by Tom Tromey <tromey@cygnus.com>, Aug 10 1996
  #
  # This program is free software; you can redistribute it and/or modify
  # it under the terms of the GNU General Public License as published by
  # the Free Software Foundation; either version 2, or (at your option)
  # any later version.
  #
  # This program is distributed in the hope that it will be useful,
  # but WITHOUT ANY WARRANTY; without even the implied warranty of
  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  # GNU General Public License for more details.
  #
  # You should have received a copy of the GNU General Public License
  # along with this program; if not, write to the Free Software
  # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  
  # Usage:
  #   interlock lock-dir-name program args-to-program...
  
  dirname="$1"
  program="$2"
  
  shift
  shift
  
  while (mkdir $dirname > /dev/null 2>&1 && exit 1 || exit 0); do
     # Wait a bit.
     sleep 1
  done
  
  # Race condition here: if interrupted after the loop but before this
  # trap, the lock can be left around.
  trap "rmdir $dirname > /dev/null 2>&1" 1 2 3 15
  
  # We have the lock, so run the program.
  $program ${1+"$@"}
  ret=$?
  
  # Release the lock.
  rmdir $dirname > /dev/null 2>&1
  
  exit $ret
  

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