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/*
Copyright (c) 2007-2009 FastMQ Inc.
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 "ypollset.hpp"
zs::ypollset_t::ypollset_t ()
{
}
void zs::ypollset_t::signal (int signal_)
{
zs_assert (signal_ >= 0 && signal_ < wait_signal);
if (bits.btsr (signal_, wait_signal))
sem.post ();
}
zs::ypollset_t::signals_t zs::ypollset_t::poll ()
{
signals_t result = 0;
while (!result) {
result = bits.izte (signals_t (1) << wait_signal, 0);
if (!result) {
sem.wait ();
result = bits.xchg (0);
}
// If btsr was really atomic, result would never be 0 at this
// point, i.e. no looping would be possible. However, to
// support even CPU architectures without CAS instruction
// we allow btsr to be composed of two independent atomic
// operation (set and reset). In such case looping can occur
// sporadically.
}
return result;
}
zs::ypollset_t::signals_t zs::ypollset_t::check ()
{
return bits.xchg (0);
}
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