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.\" ========================================================================
.\"
.IX Title "File::Flock::Retry 3pm"
.TH File::Flock::Retry 3pm "2017-11-11" "perl v5.26.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
File::Flock::Retry \- Yet another flock module
.SH "VERSION"
.IX Header "VERSION"
This document describes version 0.62 of File::Flock::Retry (from Perl distribution File-Flock-Retry), released on 2017\-07\-01.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& use File::Flock::Retry;
\&
\& # try to acquire exclusive lock. if fail to acquire lock within 60s, die.
\& my $lock = File::Flock::Retry\->lock($file);
\&
\& # explicitly unlock
\& $lock\->release;
\&
\& # automatically unlock if object is DESTROY\-ed.
\& undef $lock;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This is yet another flock module. It is a more lightweight alternative to
File::Flock with some other differences:
.IP "\(bu" 4
\&\s-1OO\s0 interface only
.IP "\(bu" 4
Autoretry (by default for 60s) when trying to acquire lock
.Sp
I prefer this approach to blocking/waiting indefinitely or failing immediately.
.SH "CAVEATS"
.IX Header "CAVEATS"
Not yet tested on Windows. Some filesystems do not support inode?
.SH "METHODS"
.IX Header "METHODS"
.ie n .SS "$lock = File::Flock::Retry\->lock($path, \e%opts)"
.el .SS "\f(CW$lock\fP = File::Flock::Retry\->lock($path, \e%opts)"
.IX Subsection "$lock = File::Flock::Retry->lock($path, %opts)"
Attempt to acquire an exclusive lock on \f(CW$path\fR. \f(CW$path\fR will be created if
not already exists. If \f(CW$path\fR is already locked by another process, will retry
every second for a number of seconds (by default 60). Will die if failed to
acquire lock after all retries.
.PP
Will automatically unlock if \f(CW$lock\fR goes out of scope. Upon unlock, will
remove \f(CW$path\fR if it was created and is still empty (this behavior is the same
as \f(CW\*(C`File::Flock\*(C'\fR).
.PP
Available options:
.IP "\(bu" 4
retries => int (default: 60)
.Sp
Number of retries (equals number of seconds, since retry is done every second).
.IP "\(bu" 4
shared => bool (default: 0)
.Sp
By default, an exclusive lock (\s-1LOCK_EX\s0) is attempted. However, if this option is
set to true, a shared lock (\s-1LOCK_SH\s0) is attempted.
.ie n .SS "$lock\->unlock"
.el .SS "\f(CW$lock\fP\->unlock"
.IX Subsection "$lock->unlock"
Unlock.
.ie n .SS "$lock\->release"
.el .SS "\f(CW$lock\fP\->release"
.IX Subsection "$lock->release"
Synonym for \f(CW\*(C`unlock()\*(C'\fR.
.SH "HOMEPAGE"
.IX Header "HOMEPAGE"
Please visit the project's homepage at <https://metacpan.org/release/File\-Flock\-Retry>.
.SH "SOURCE"
.IX Header "SOURCE"
Source repository is at <https://github.com/perlancar/perl\-File\-Flock\-Retry>.
.SH "BUGS"
.IX Header "BUGS"
Please report any bugs or feature requests on the bugtracker website <https://rt.cpan.org/Public/Dist/Display.html?Name=File\-Flock\-Retry>
.PP
When submitting a bug or request, please include a test-file or a
patch to an existing test-file that illustrates the bug or desired
feature.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
File::Flock
.PP
File::Flock::Tiny which is also tiny, but does not have the autoremove and
autoretry capability which I want. See also:
<https://github.com/trinitum/perl\-File\-Flock\-Tiny/issues/1>
.PP
\&\fIflock()\fR Perl function.
.SH "AUTHOR"
.IX Header "AUTHOR"
perlancar <perlancar@cpan.org>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This software is copyright (c) 2017, 2015, 2014 by perlancar@cpan.org.
.PP
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.