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/*
Copyright (c) 2007-2010 iMatix Corporation
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the Lesser GNU 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
Lesser GNU General Public License for more details.
You should have received a copy of the Lesser GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "../bindings/c/zmq.h"
#include "fq.hpp"
#include "pipe.hpp"
#include "err.hpp"
zmq::fq_t::fq_t () :
active (0),
current (0)
{
}
zmq::fq_t::~fq_t ()
{
for (pipes_t::size_type i = 0; i != pipes.size (); i++)
pipes [i]->term ();
}
void zmq::fq_t::attach (reader_t *pipe_)
{
pipes.push_back (pipe_);
pipes.swap (active, pipes.size () - 1);
active++;
}
void zmq::fq_t::detach (reader_t *pipe_)
{
// Remove the pipe from the list; adjust number of active pipes
// accordingly.
if (pipes.index (pipe_) < active) {
active--;
if (current == active)
current = 0;
}
pipes.erase (pipe_);
}
void zmq::fq_t::kill (reader_t *pipe_)
{
// Move the pipe to the list of inactive pipes.
active--;
if (current == active)
current = 0;
pipes.swap (pipes.index (pipe_), active);
}
void zmq::fq_t::revive (reader_t *pipe_)
{
// Move the pipe to the list of active pipes.
pipes.swap (pipes.index (pipe_), active);
active++;
}
int zmq::fq_t::recv (zmq_msg_t *msg_, int flags_)
{
// Deallocate old content of the message.
zmq_msg_close (msg_);
// Round-robin over the pipes to get next message.
for (int count = active; count != 0; count--) {
bool fetched = pipes [current]->read (msg_);
current++;
if (current >= active)
current = 0;
if (fetched)
return 0;
}
// No message is available. Initialise the output parameter
// to be a 0-byte message.
zmq_msg_init (msg_);
errno = EAGAIN;
return -1;
}
bool zmq::fq_t::has_in ()
{
// Note that messing with current doesn't break the fairness of fair
// queueing algorithm. If there are no messages available current will
// get back to its original value. Otherwise it'll point to the first
// pipe holding messages, skipping only pipes with no messages available.
for (int count = active; count != 0; count--) {
if (pipes [current]->check_read ())
return true;
current++;
if (current >= active)
current = 0;
}
return false;
}
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