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Man Pages


Manual Reference Pages  -  FILE::FLOCK::SUBPROCESS (3)

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NAME



 File::Flock::Subprocess - file locking with flock in a subprocess



CONTENTS

SYNOPSIS



 use File::Flock::Subprocess;

 lock($filename);

 lock($filename, shared);

 lock($filename, undef, nonblocking);

 lock($filename, shared, nonblocking);

 unlock($filename);

 lock_rename($oldfilename, $newfilename)

 my $lock = new File::Flock /somefile;

 $lock->unlock();

 $lock->lock_rename(/new/file);

 forget_locks();



DESCRIPTION

This is a wrapper around File::Flock that starts a subprocess and does the locking in the subprocess with File::Flock. The purpose of this is to handle operating systems (eg: Solaris) that do not retain locks across a call to fork().

The sub-process for this is created with fork() when File::Flock::Subprocess is compiled. I’ve tried to minimize the side-effects calling fork() by doing calling it early and by using POSIX::_exit() to quit but it is still worth being aware of. I suggest loading File::Flock::Subprocess early.

Use File::Flock::Forking to automatically detect when this is needed.

Read the docs for File::Flock for details of the API.

ERRATA

Any errors reported by the locking proxy File::Flock::Subprocess starts will be reported as Compilation Failed errors because the proxy is started in a BEGIN{} block.

LICENSE

Copyright (C) 2013 Google, Inc. This module may be used/copied/etc on the same terms as Perl itself.
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perl v5.20.3 FILE::FLOCK::SUBPROCESS (3) 2013-10-15

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