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//
// detail/reactor_op_queue.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2012 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef BOOST_ASIO_DETAIL_REACTOR_OP_QUEUE_HPP
#define BOOST_ASIO_DETAIL_REACTOR_OP_QUEUE_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/config.hpp>
#include <boost/asio/detail/hash_map.hpp>
#include <boost/asio/detail/noncopyable.hpp>
#include <boost/asio/detail/op_queue.hpp>
#include <boost/asio/detail/reactor_op.hpp>
#include <boost/asio/error.hpp>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
namespace detail {
template <typename Descriptor>
class reactor_op_queue
: private noncopyable
{
public:
// Constructor.
reactor_op_queue()
: operations_()
{
}
// Add a new operation to the queue. Returns true if this is the only
// operation for the given descriptor, in which case the reactor's event
// demultiplexing function call may need to be interrupted and restarted.
bool enqueue_operation(Descriptor descriptor, reactor_op* op)
{
typedef typename operations_map::iterator iterator;
typedef typename operations_map::value_type value_type;
std::pair<iterator, bool> entry =
operations_.insert(value_type(descriptor, operations()));
entry.first->second.op_queue_.push(op);
return entry.second;
}
// Cancel all operations associated with the descriptor. Any operations
// pending for the descriptor will be notified that they have been cancelled
// next time perform_cancellations is called. Returns true if any operations
// were cancelled, in which case the reactor's event demultiplexing function
// may need to be interrupted and restarted.
bool cancel_operations(Descriptor descriptor, op_queue<operation>& ops,
const boost::system::error_code& ec =
boost::asio::error::operation_aborted)
{
typename operations_map::iterator i = operations_.find(descriptor);
if (i != operations_.end())
{
while (reactor_op* op = i->second.op_queue_.front())
{
op->ec_ = ec;
i->second.op_queue_.pop();
ops.push(op);
}
operations_.erase(i);
return true;
}
return false;
}
// Whether there are no operations in the queue.
bool empty() const
{
return operations_.empty();
}
// Determine whether there are any operations associated with the descriptor.
bool has_operation(Descriptor descriptor) const
{
return operations_.find(descriptor) != operations_.end();
}
// Perform the operations corresponding to the descriptor. Returns true if
// there are still unfinished operations queued for the descriptor.
bool perform_operations(Descriptor descriptor, op_queue<operation>& ops)
{
typename operations_map::iterator i = operations_.find(descriptor);
if (i != operations_.end())
{
while (reactor_op* op = i->second.op_queue_.front())
{
if (op->perform())
{
i->second.op_queue_.pop();
ops.push(op);
}
else
{
return true;
}
}
operations_.erase(i);
}
return false;
}
// Fill a descriptor set with the descriptors corresponding to each active
// operation. The op_queue is used only when descriptors fail to be added to
// the descriptor set.
template <typename Descriptor_Set>
void get_descriptors(Descriptor_Set& descriptors, op_queue<operation>& ops)
{
typename operations_map::iterator i = operations_.begin();
while (i != operations_.end())
{
Descriptor descriptor = i->first;
++i;
if (!descriptors.set(descriptor))
{
boost::system::error_code ec(error::fd_set_failure);
cancel_operations(descriptor, ops, ec);
}
}
}
// Perform the operations corresponding to the ready file descriptors
// contained in the given descriptor set.
template <typename Descriptor_Set>
void perform_operations_for_descriptors(
const Descriptor_Set& descriptors, op_queue<operation>& ops)
{
typename operations_map::iterator i = operations_.begin();
while (i != operations_.end())
{
typename operations_map::iterator op_iter = i++;
if (descriptors.is_set(op_iter->first))
{
while (reactor_op* op = op_iter->second.op_queue_.front())
{
if (op->perform())
{
op_iter->second.op_queue_.pop();
ops.push(op);
}
else
{
break;
}
}
if (op_iter->second.op_queue_.empty())
operations_.erase(op_iter);
}
}
}
// Get all operations owned by the queue.
void get_all_operations(op_queue<operation>& ops)
{
typename operations_map::iterator i = operations_.begin();
while (i != operations_.end())
{
typename operations_map::iterator op_iter = i++;
ops.push(op_iter->second.op_queue_);
operations_.erase(op_iter);
}
}
private:
struct operations
{
operations() {}
operations(const operations&) {}
void operator=(const operations&) {}
// The operations waiting on the desccriptor.
op_queue<reactor_op> op_queue_;
};
// The type for a map of operations.
typedef hash_map<Descriptor, operations> operations_map;
// The operations that are currently executing asynchronously.
operations_map operations_;
};
} // namespace detail
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_DETAIL_REACTOR_OP_QUEUE_HPP
|
