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There may be a lot of read processes running simultaneously
that catch the lock.

=head3 wlock(CODEREF).

You declare that You want to lock mutex for writing. When it is
possible the mutex will be locked and Your callback will be called.

There may be only one write process that catches the lock.

Both callbacks receive a guard to hold the mutex locked.


=head3 rlock_limit(NUMBER)

Get/Set count limit for rlock. If an rlock request is come and this limit
is reached the request will be queued.


=head3 is_locked

lib/AnyEvent/Tools.pm  view on Meta::CPAN

TRUE on the first iteration.

=item 4. last_flag

TRUE on the last iteration.

=back

=head2 async_for(HASREF|ARRAYREF, CALLBACK [, DONE_CALLBACK ]);

Calls Your callbacks for each array or hash element.

The function returns the guard if it is called in non-void
context. Destroy the guard if You want to cancel iterations.

If You process an array using the function, iteration callback
will receive the following arguments:

=over

=item 1. guard