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#ifndef QPID_SYS_WINDOWS_POLLABLECONDITION_CPP
#define QPID_SYS_WINDOWS_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/IOHandle.h"
#include "qpid/sys/windows/AsynchIoResult.h"
#include "qpid/sys/windows/IoHandlePrivate.h"
#include <boost/bind.hpp>
#include <windows.h>
namespace qpid {
namespace sys {
// PollableConditionPrivate will reuse the IocpPoller's ability to queue
// a completion to the IOCP and have it dispatched to the completer callback
// noted in the IOHandlePrivate when the request is queued. The
// AsynchCallbackRequest object is not really used - we already have the
// desired callback for the user of PollableCondition.
class PollableConditionPrivate : private IOHandle {
friend class PollableCondition;
private:
PollableConditionPrivate(const sys::PollableCondition::Callback& cb,
sys::PollableCondition& parent,
const boost::shared_ptr<sys::Poller>& poller);
~PollableConditionPrivate();
void poke();
void dispatch(windows::AsynchIoResult *result);
private:
PollableCondition::Callback cb;
PollableCondition& parent;
boost::shared_ptr<sys::Poller> poller;
LONG isSet;
};
PollableConditionPrivate::PollableConditionPrivate(const sys::PollableCondition::Callback& cb,
sys::PollableCondition& parent,
const boost::shared_ptr<sys::Poller>& poller)
: IOHandle(new sys::IOHandlePrivate(INVALID_SOCKET,
boost::bind(&PollableConditionPrivate::dispatch, this, _1))),
cb(cb), parent(parent), poller(poller), isSet(0)
{
}
PollableConditionPrivate::~PollableConditionPrivate()
{
}
void PollableConditionPrivate::poke()
{
// monitorHandle will queue a completion for the IOCP; when it's handled, a
// poller thread will call back to dispatch() below.
PollerHandle ph(*this);
poller->monitorHandle(ph, Poller::INPUT);
}
void PollableConditionPrivate::dispatch(windows::AsynchIoResult *result)
{
delete result; // Poller::monitorHandle() allocates this
cb(parent);
if (isSet)
poke();
}
/* PollableCondition */
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() {
// Add one to the set count and poke it to provoke a callback
::InterlockedIncrement(&impl->isSet);
impl->poke();
}
void PollableCondition::clear() {
::InterlockedExchange(&impl->isSet, 0);
}
}} // namespace qpid::sys
#endif /*!QPID_SYS_WINDOWS_POLLABLECONDITION_CPP*/
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