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11dc0016bb
* src/wc.c (main): Set stdout to line buffered mode
to ensure parallel running instances don't intersperse
their output. This adds 6.5% to the run time in the worst case
of many zero length files, but has neglible impact for
standard sized files.
* tests/misc/wc-parallel: New test for atomic output.
* tests/Makefile.am: Reference it.
* NEWS: Mention the fix
This is similar to commit 710fe413, 20-10-2009,
"md5sum, sha*sum, sum: line-buffer the printed checksums"
38 lines
1.2 KiB
Bash
Executable File
38 lines
1.2 KiB
Bash
Executable File
#!/bin/sh
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# Ensure that wc prints counts atomically
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# so that concurrent processes don't intersperse their output
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# Copyright (C) 2009 Free Software Foundation, Inc.
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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 3 of the License, or
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# (at your option) any later version.
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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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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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. $srcdir/test-lib.sh
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if test "$VERBOSE" = yes; then
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set -x
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md5sum --version
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fi
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(mkdir tmp && cd tmp && seq 2000 | xargs touch)
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# This will output at least 16KiB per process
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# and start 3 processes, with 2 running concurrently,
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# which triggers often on Fedora 11 at least.
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(find tmp tmp tmp -type f | xargs -n2000 -P2 wc) |
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sed -n '/0 0 0 /!p' |
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grep . > /dev/null && fail=1
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Exit $fail
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