Win32::IPC - Base class for Win32 synchronization objects


NAME

Win32::IPC - Base class for Win32 synchronization objects

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VERSION

This document describes version 1.07 of Win32::IPC, released April 16, 2008 as part of Win32-IPC version 1.07.

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SYNOPSIS

    use Win32::Event 1.00 qw(wait_any);
    #Create objects.
    wait_any(@ListOfObjects, $timeout);

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DESCRIPTION

This module is loaded by the other Win32 synchronization modules. You shouldn't need to load it yourself. It supplies the wait functions to those modules.

The synchronization modules are the Win32::ChangeNotify manpage, the Win32::Event manpage, the Win32::Mutex manpage, & the Win32::Semaphore manpage.

In addition, you can use wait_any and wait_all with the Win32::Console manpage and the Win32::Process manpage objects. (However, those modules do not export the wait functions; you must load one of the synchronization modules (or just Win32::IPC)).

Methods

Win32::IPC supplies one method to all synchronization objects.

$obj->wait([$timeout])

Waits for $obj to become signalled. $timeout is the maximum time to wait (in milliseconds). If $timeout is omitted or undef, waits forever. If $timeout is 0, returns immediately.

Returns:

   +1    The object is signalled
   -1    The object is an abandoned mutex
    0    Timed out
  undef  An error occurred (check C<$^E> for details)

Functions

wait_any(@objects, [$timeout])

Waits for at least one of the @objects to become signalled. $timeout is the maximum time to wait (in milliseconds). If $timeout is omitted or undef, waits forever. If $timeout is 0, returns immediately.

The return value indicates which object ended the wait:

   +N    $object[N-1] is signalled
   -N    $object[N-1] is an abandoned mutex
    0    Timed out
  undef  An error occurred (check C<$^E> for details)

If more than one object became signalled, the one with the lowest index is used.

wait_all(@objects, [$timeout])

This is the same as wait_any, but it waits for all the @objects to become signalled. The return value indicates the last object to become signalled, and is negative if at least one of the @objects is an abandoned mutex.

Deprecated Functions and Methods

Win32::IPC still supports the ActiveWare syntax, but its use is deprecated.

INFINITE

Constant value for an infinite timeout. Omit the $timeout argument (or pass undef) instead.

INFINITE is only mildly deprecated. If you have a good use for it, feel free to continue to use it. That is, $object->wait(INFINITE) is pointless, but $object->wait($timeout) (where $timeout may or may not equal INFINITE) may make sense.

WaitForMultipleObjects(\@objects, $wait_all, $timeout)

Warning: WaitForMultipleObjects erases @objects! Use wait_all or wait_any instead.

$obj->Wait($timeout)

Similar to not $obj->wait($timeout).

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INTERNALS

The wait_any and wait_all functions support two kinds of objects. Objects derived from Win32::IPC are expected to consist of a reference to a scalar containing the Win32 HANDLE as an IV.

Other objects (for which UNIVERSAL::isa($object, "Win32::IPC") is false), are expected to implement a get_Win32_IPC_HANDLE method. When called in scalar context with no arguments, this method should return a Win32 HANDLE (as an IV) suitable for passing to the Win32 WaitForMultipleObjects API function.

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DIAGNOSTICS

None.

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CONFIGURATION AND ENVIRONMENT

Win32::IPC requires no configuration files or environment variables.

It runs under 32-bit or 64-bit Microsoft Windows, either natively or under Cygwin.

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DEPENDENCIES

None.

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INCOMPATIBILITIES

Prior to version 1.06, the Win32 IPC modules treated undef values differently. In version 1.06 and later, passing undef as the value of an optional parameter is the same as omitting that parameter. In previous versions, undef was interpreted as either the empty string or 0 (along with a warning about "Use of uninitialized value...").

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BUGS AND LIMITATIONS

No bugs have been reported.

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AUTHOR

Christopher J. Madsen <perl AT cjmweb.net>

Please report any bugs or feature requests to <bug-Win32-IPC AT rt.cpan.org> >, or through the web interface at http://rt.cpan.org/Public/Bug/Report.html

Loosely based on the original module by ActiveWare Internet Corp., http://www.ActiveState.com

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LICENSE AND COPYRIGHT

Copyright 1998-2008 Christopher J. Madsen

Created: 3 Feb 1998 from the ActiveWare version (c) 1995 Microsoft Corporation. All rights reserved. Developed by ActiveWare Internet Corp., http://www.ActiveState.com

  Other modifications (c) 1997 by Gurusamy Sarathy <gsar@cpan.org>

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic.

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DISCLAIMER OF WARRANTY

BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR, OR CORRECTION.

IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENSE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

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 Win32::IPC - Base class for Win32 synchronization objects