1 | ###########################################################################
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2 | #
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3 | # gflock.pm - an attempt to use flock only on those platforms
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4 | # on which it's supported (i.e. everything but Windows 95/98)
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5 | #
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6 | # A component of the Greenstone digital library software
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7 | # from the New Zealand Digital Library Project at the
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8 | # University of Waikato, New Zealand.
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9 | #
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10 | # Copyright (C) 1999 New Zealand Digital Library Project
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11 | #
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12 | # This program is free software; you can redistribute it and/or modify
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13 | # it under the terms of the GNU General Public License as published by
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14 | # the Free Software Foundation; either version 2 of the License, or
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15 | # (at your option) any later version.
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16 | #
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17 | # This program is distributed in the hope that it will be useful,
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18 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 | # GNU General Public License for more details.
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21 | #
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22 | # You should have received a copy of the GNU General Public License
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23 | # along with this program; if not, write to the Free Software
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24 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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25 | #
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26 | ###########################################################################
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27 |
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28 | package gflock;
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29 |
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30 | use Fcntl ':flock';
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31 | use strict;
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32 |
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33 | # returns true if successful (or if OS is a form of windows other than NT)
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34 | sub lock {
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35 | my ($handle) = @_;
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36 |
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37 | if ($ENV{'GSDLOS'} eq "windows" && !Win32::IsWinNT()) {
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38 | return 1;
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39 | } else {
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40 | return flock($handle, LOCK_EX);
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41 | }
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42 | }
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43 |
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44 | # returns true if successful (or if OS is a form of windows other than NT)
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45 | sub unlock {
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46 | my ($handle) = @_;
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47 |
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48 | if ($ENV{'GSDLOS'} eq "windows" && !Win32::IsWinNT()) {
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49 | return 1;
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50 | } else {
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51 | return flock($handle, LOCK_UN);
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52 | }
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53 | }
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54 |
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55 | 1;
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