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#ifndef QPID_SYS_LINUX_POLLABLECONDITION_CPP
#define QPID_SYS_LINUX_POLLABLECONDITION_CPP
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#include "qpid/sys/PollableCondition.h"
#include "qpid/sys/DispatchHandle.h"
#include "qpid/sys/IOHandle.h"
#include "qpid/sys/posix/PrivatePosix.h"
#include "qpid/Exception.h"
#include <boost/bind.hpp>
#include <unistd.h>
#include <fcntl.h>
namespace qpid {
namespace sys {
class PollableConditionPrivate : public sys::IOHandle {
friend class PollableCondition;
private:
PollableConditionPrivate(const sys::PollableCondition::Callback& cb,
sys::PollableCondition& parent,
const boost::shared_ptr<sys::Poller>& poller);
~PollableConditionPrivate();
void dispatch(sys::DispatchHandle& h);
void set();
void clear();
private:
PollableCondition::Callback cb;
PollableCondition& parent;
boost::shared_ptr<sys::Poller> poller;
int writeFd;
std::auto_ptr<DispatchHandleRef> handle;
};
PollableConditionPrivate::PollableConditionPrivate(
const sys::PollableCondition::Callback& cb,
sys::PollableCondition& parent,
const boost::shared_ptr<sys::Poller>& poller
) : IOHandle(new sys::IOHandlePrivate), cb(cb), parent(parent)
{
int fds[2];
if (::pipe(fds) == -1)
throw ErrnoException(QPID_MSG("Can't create PollableCondition"));
impl->fd = fds[0];
writeFd = fds[1];
if (::fcntl(impl->fd, F_SETFL, O_NONBLOCK) == -1)
throw ErrnoException(QPID_MSG("Can't create PollableCondition"));
if (::fcntl(writeFd, F_SETFL, O_NONBLOCK) == -1)
throw ErrnoException(QPID_MSG("Can't create PollableCondition"));
handle.reset (new DispatchHandleRef(
*this,
boost::bind(&sys::PollableConditionPrivate::dispatch, this, _1),
0, 0));
handle->startWatch(poller);
handle->unwatch();
// Make the read FD readable
static const char dummy=0;
ssize_t n = ::write(writeFd, &dummy, 1);
if (n == -1 && errno != EAGAIN)
throw ErrnoException("Error setting PollableCondition");
}
PollableConditionPrivate::~PollableConditionPrivate() {
handle->stopWatch();
close(writeFd);
}
void PollableConditionPrivate::dispatch(sys::DispatchHandle&) {
cb(parent);
}
void PollableConditionPrivate::set() {
handle->rewatch();
}
void PollableConditionPrivate::clear() {
handle->unwatch();
}
PollableCondition::PollableCondition(const Callback& cb,
const boost::shared_ptr<sys::Poller>& poller
) : impl(new PollableConditionPrivate(cb, *this, poller))
{
}
PollableCondition::~PollableCondition()
{
delete impl;
}
void PollableCondition::set() { impl->set(); }
void PollableCondition::clear() { impl->clear(); }
}} // namespace qpid::sys
#endif /*!QPID_SYS_LINUX_POLLABLECONDITION_CPP*/
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