NAME

       Mail::SpamAssassin::Timeout - safe, reliable timeouts in perl

SYNOPSIS

           # non-timeout code...

           my $t = Mail::SpamAssassin::Timeout->new({ secs => 5, deadline => $when });

           $t->run(sub {
               # code to run with a 5-second timeout...
           });

           if ($t->timed_out()) {
               # do something...
           }

           # more non-timeout code...

DESCRIPTION

       This module provides a safe, reliable and clean API to provide alarm(2)-based timeouts for
       perl code.

       Note that $SIG{ALRM} is used to provide the timeout, so this will not interrupt out-of-
       control regular expression matches.

       Nested timeouts are supported.

PUBLIC METHODS

       my $t = Mail::SpamAssassin::Timeout->new({ ... options ... });
           Constructor.  Options include:

           secs => $seconds
               time interval, in seconds. Optional; if neither "secs" nor "deadline" is
               specified, no timeouts will be applied.

           deadline => $unix_timestamp
               Unix timestamp (seconds since epoch) when a timeout is reached in the latest.
               Optional; if neither secs nor deadline is specified, no timeouts will be applied.
               If both are specified, the shorter interval of the two prevails.

       $t->run($coderef)
           Run a code reference within the currently-defined timeout.

           The timeout is as defined by the secs and deadline parameters to the constructor.

           Returns whatever the subroutine returns, or "undef" on timeout.  If the timer times
           out, "$t-<gt"timed_out()> will return 1.

           Time elapsed is not cumulative; multiple runs of "run" will restart the timeout from
           scratch. On the other hand, nested timers do observe outer timeouts if they are
           shorter, resignalling a timeout to the level which established them, i.e. code running
           under an inner timer can not exceed the time limit established by an outer timer. When
           restarting an outer timer on return, elapsed time of a running code is taken into
           account.

       $t->run_and_catch($coderef)
           Run a code reference, as per "$t-<gt"run()>, but also catching any "die()" calls
           within the code reference.

           Returns "undef" if no "die()" call was executed and $@ was unset, or the value of $@
           if it was set.  (The timeout event doesn't count as a "die()".)

       $t->timed_out()
           Returns 1 if the most recent code executed in "run()" timed out, or "undef" if it did
           not.

       $t->reset()
           If called within a "run()" code reference, causes the current alarm timer to be
           restored to its original setting (useful after our alarm setting was clobbered by some
           underlying module).