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.\" ========================================================================
.\"
.IX Title "Out 3pm"
.TH Out 3pm "2009-05-04" "perl v5.18.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Time::Out \- Easily timeout long running operations
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  use Time::Out qw(timeout) ;
\&
\&  timeout $nb_secs => sub {
\&    # your code goes were and will be interrupted if it runs
\&    # for more than $nb_secs seconds.
\&  } ;
\&  if ($@){
\&    # operation timed\-out
\&  }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\f(CW\*(C`Time::Out\*(C'\fR provides an easy interface to \fI\fIalarm\fI\|(2)\fR based timeouts. 
Nested timeouts are supported.
.SS "\s-1RETURN VALUE\s0"
.IX Subsection "RETURN VALUE"
\&'timeout' returns whatever the code placed inside the block returns:
.PP
.Vb 1
\&  use Time::Out qw(timeout) ;
\&
\&  my $rc = timeout 5 => sub {
\&        return 7 ;
\&  } ;
\&  # $rc == 7
.Ve
.ie n .SH """Time::HiRes"""
.el .SH "\f(CWTime::HiRes\fP"
.IX Header "Time::HiRes"
If \f(CW\*(C`Time::Out\*(C'\fR sees that \f(CW\*(C`Time::HiRes\*(C'\fR has been loaded, it will use 
that 'alarm' function (if available) instead of the default one, allowing 
float timeout values to be used effectively:
.PP
.Vb 2
\&  use Time::Out ;
\&  use Time::HiRes ;
\&
\&  timeout 3.1416 => sub {
\&        # ...
\&  } ;
.Ve
.SH "BUGS"
.IX Header "BUGS"
.IP "Blocking I/O on MSWin32" 4
.IX Item "Blocking I/O on MSWin32"
\&\fI\fIalarm\fI\|(2)\fR doesn't interrupt blocking I/O on MSWin32, so 'timeout' won't
do that either.
.ie n .IP "@_" 4
.el .IP "\f(CW@_\fR" 4
.IX Item "@_"
One drawback to using 'timeout' is that it masks \f(CW@_\fR in the affected code. 
This happens because the affected code is actually wrapped inside another 
subroutine that provides it's own \f(CW@_\fR. You can get around this by 
specifically passing your \f(CW@_\fR (or whatever you want for that matter) to 
\&'timeout' as such:
.Sp
.Vb 1
\&  use Time::Out ;
\&
\&  sub test {
\&    timeout 5, @_ => sub {
\&      print "$_[0]\en" ;
\&    } ;
\&  }
\&
\&  test("hello") ; # will print "hello\en" ;
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
eval, closures, \fI\fIalarm\fI\|(2)\fR, Sys::AlarmCall
.SH "AUTHOR"
.IX Header "AUTHOR"
Patrick LeBoutillier, <patl@cpan.org>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright 2005\-2008 by Patrick LeBoutillier
.PP
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.