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