update from main archive 960830
[glibc.git] / autolock.sh
blob88e27332e6b06d20073b5796501c13261f679ba1
1 #! /bin/sh
2 # interlock - wrap program invocation in lock to allow
3 # parallel builds to work.
4 # Written by Tom Tromey <tromey@cygnus.com>, Aug 10 1996
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, or (at your option)
9 # any later version.
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.
16 # You should have received a copy of the GNU General Public License
17 # along with this program; if not, write to the Free Software
18 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 # Usage:
21 # interlock lock-dir-name program args-to-program...
23 dirname="$1"
24 program="$2"
26 shift
27 shift
29 while (mkdir $dirname > /dev/null 2>&1 && exit 1 || exit 0); do
30 # Wait a bit.
31 sleep 1
32 done
34 # Race condition here: if interrupted after the loop but before this
35 # trap, the lock can be left around.
36 trap "rmdir $dirname > /dev/null 2>&1" 1 2 3 15
38 # We have the lock, so run the program.
39 $program ${1+"$@"}
40 ret=$?
42 # Release the lock.
43 rmdir $dirname > /dev/null 2>&1
45 exit $ret