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/*
Copyright (c) 2007-2011 iMatix Corporation
Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
0MQ is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "own.hpp"
#include "err.hpp"
#include "io_thread.hpp"
zmq::own_t::own_t (class ctx_t *parent_, uint32_t tid_) :
object_t (parent_, tid_),
terminating (false),
sent_seqnum (0),
processed_seqnum (0),
owner (NULL),
term_acks (0)
{
}
zmq::own_t::own_t (io_thread_t *io_thread_, const options_t &options_) :
object_t (io_thread_),
options (options_),
terminating (false),
sent_seqnum (0),
processed_seqnum (0),
owner (NULL),
term_acks (0)
{
}
zmq::own_t::~own_t ()
{
}
void zmq::own_t::set_owner (own_t *owner_)
{
zmq_assert (!owner);
owner = owner_;
}
void zmq::own_t::inc_seqnum ()
{
// This function may be called from a different thread!
sent_seqnum.add (1);
}
void zmq::own_t::process_seqnum ()
{
// Catch up with counter of processed commands.
processed_seqnum++;
// We may have catched up and still have pending terms acks.
check_term_acks ();
}
void zmq::own_t::launch_child (own_t *object_)
{
// Specify the owner of the object.
object_->set_owner (this);
// Plug the object into the I/O thread.
send_plug (object_);
// Take ownership of the object.
send_own (this, object_);
}
void zmq::own_t::launch_sibling (own_t *object_)
{
// At this point it is important that object is plugged in before its
// owner has a chance to terminate it. Thus, 'plug' command is sent before
// the 'own' command. Given that the mailbox preserves ordering of
// commands, 'term' command from the owner cannot make it to the object
// before the already written 'plug' command.
// Specify the owner of the object.
object_->set_owner (owner);
// Plug the object into its I/O thread.
send_plug (object_);
// Make parent own the object.
send_own (owner, object_);
}
void zmq::own_t::process_term_req (own_t *object_)
{
// When shutting down we can ignore termination requests from owned
// objects. The termination request was already sent to the object.
if (terminating)
return;
// If I/O object is well and alive let's ask it to terminate.
owned_t::iterator it = std::find (owned.begin (), owned.end (), object_);
// If not found, we assume that termination request was already sent to
// the object so we can safely ignore the request.
if (it == owned.end ())
return;
owned.erase (it);
register_term_acks (1);
// Note that this object is the root of the (partial shutdown) thus, its
// value of linger is used, rather than the value stored by the children.
send_term (object_, options.linger);
}
void zmq::own_t::process_own (own_t *object_)
{
// If the object is already being shut down, new owned objects are
// immediately asked to terminate. Note that linger is set to zero.
if (terminating) {
register_term_acks (1);
send_term (object_, 0);
return;
}
// Store the reference to the owned object.
owned.insert (object_);
}
void zmq::own_t::terminate ()
{
// If termination is already underway, there's no point
// in starting it anew.
if (terminating)
return;
// As for the root of the ownership tree, there's noone to terminate it,
// so it has to terminate itself.
if (!owner) {
process_term (options.linger);
return;
}
// If I am an owned object, I'll ask my owner to terminate me.
send_term_req (owner, this);
}
void zmq::own_t::process_term (int linger_)
{
// Double termination should never happen.
zmq_assert (!terminating);
// Send termination request to all owned objects.
for (owned_t::iterator it = owned.begin (); it != owned.end (); ++it)
send_term (*it, linger_);
register_term_acks (owned.size ());
owned.clear ();
// Start termination process and check whether by chance we cannot
// terminate immediately.
terminating = true;
check_term_acks ();
}
void zmq::own_t::register_term_acks (int count_)
{
term_acks += count_;
}
void zmq::own_t::unregister_term_ack ()
{
zmq_assert (term_acks > 0);
term_acks--;
// This may be a last ack we are waiting for before termination...
check_term_acks ();
}
void zmq::own_t::process_term_ack ()
{
unregister_term_ack ();
}
void zmq::own_t::check_term_acks ()
{
if (terminating && processed_seqnum == sent_seqnum.get () &&
term_acks == 0) {
// Sanity check. There should be no active children at this point.
zmq_assert (owned.empty ());
// The root object has nobody to confirm the termination to.
// Other nodes will confirm the termination to the owner.
if (owner)
send_term_ack (owner);
// Deallocate the resources.
process_destroy ();
}
}
void zmq::own_t::process_destroy ()
{
delete this;
}
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