| /* |
| * |
| * 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 |