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//
// detail/reactor_op_queue.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 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 ASIO_DETAIL_REACTOR_OP_QUEUE_HPP
#define ASIO_DETAIL_REACTOR_OP_QUEUE_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include "asio/detail/hash_map.hpp"
#include "asio/detail/noncopyable.hpp"
#include "asio/detail/op_queue.hpp"
#include "asio/detail/reactor_op.hpp"
#include "asio/error.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
template <typename Descriptor>
class reactor_op_queue
: private noncopyable
{
public:
typedef Descriptor key_type;
struct mapped_type : op_queue<reactor_op>
{
mapped_type() {}
mapped_type(const mapped_type&) {}
void operator=(const mapped_type&) {}
};
typedef typename hash_map<key_type, mapped_type>::value_type value_type;
typedef typename hash_map<key_type, mapped_type>::iterator iterator;
// Constructor.
reactor_op_queue()
: operations_()
{
}
// Obtain iterators to all registered descriptors.
iterator begin() { return operations_.begin(); }
iterator end() { return operations_.end(); }
// 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)
{
std::pair<iterator, bool> entry =
operations_.insert(value_type(descriptor, mapped_type()));
entry.first->second.push(op);
return entry.second;
}
// Cancel all operations associated with the descriptor identified by the
// supplied iterator. Any operations pending for the descriptor will be
// cancelled. 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(iterator i, op_queue<operation>& ops,
const asio::error_code& ec =
asio::error::operation_aborted)
{
if (i != operations_.end())
{
while (reactor_op* op = i->second.front())
{
op->ec_ = ec;
i->second.pop();
ops.push(op);
}
operations_.erase(i);
return true;
}
return false;
}
// Cancel all operations associated with the descriptor. Any operations
// pending for the descriptor will be cancelled. 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 asio::error_code& ec =
asio::error::operation_aborted)
{
return this->cancel_operations(operations_.find(descriptor), ops, ec);
}
// 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 identified by the
// supplied iterator. Returns true if there are still unfinished operations
// queued for the descriptor.
bool perform_operations(iterator i, op_queue<operation>& ops)
{
if (i != operations_.end())
{
while (reactor_op* op = i->second.front())
{
if (op->perform())
{
i->second.pop();
ops.push(op);
}
else
{
return true;
}
}
operations_.erase(i);
}
return false;
}
// 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)
{
return this->perform_operations(operations_.find(descriptor), ops);
}
// Get all operations owned by the queue.
void get_all_operations(op_queue<operation>& ops)
{
iterator i = operations_.begin();
while (i != operations_.end())
{
iterator op_iter = i++;
ops.push(op_iter->second);
operations_.erase(op_iter);
}
}
private:
// The operations that are currently executing asynchronously.
hash_map<key_type, mapped_type> operations_;
};
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_DETAIL_REACTOR_OP_QUEUE_HPP
|
