Section: User Contributed Perl Documentation (3)
Updated: 2006-09-29
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Mail::SpamAssassin::Timeout - safe, reliable timeouts in perl  


    # non-timeout code...

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

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

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

    # more non-timeout code...



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.  


my $t = Mail::SpamAssassin::Timeout->new({ ... options ... });
Constructor. Options include:
secs => $seconds
timeout, in seconds. Optional; if not specified, no timeouts will be applied.
Run a code reference within the currently-defined timeout.

The timeout is as defined by the secs parameter 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.

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()".)

Returns 1 if the most recent code executed in "run()" timed out, or "undef" if it did not.
If called within a "run()" code reference, causes the current alarm timer to be reset to its starting value.



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