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asio/include/asio/detail/reactor.hpp

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+//
+// detail/reactor.hpp
+// ~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2020 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_HPP
+#define ASIO_DETAIL_REACTOR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/reactor_fwd.hpp"
+
+#if defined(ASIO_HAS_EPOLL)
+# include "asio/detail/epoll_reactor.hpp"
+#elif defined(ASIO_HAS_KQUEUE)
+# include "asio/detail/kqueue_reactor.hpp"
+#elif defined(ASIO_HAS_DEV_POLL)
+# include "asio/detail/dev_poll_reactor.hpp"
+#elif defined(ASIO_HAS_IOCP) || defined(ASIO_WINDOWS_RUNTIME)
+# include "asio/detail/null_reactor.hpp"
+#else
+# include "asio/detail/select_reactor.hpp"
+#endif
+
+#endif // ASIO_DETAIL_REACTOR_HPP

asio/include/asio/detail/reactor_fwd.hpp

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+//
+// detail/reactor_fwd.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2020 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_FWD_HPP
+#define ASIO_DETAIL_REACTOR_FWD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+namespace asio {
+namespace detail {
+
+#if defined(ASIO_HAS_IOCP) || defined(ASIO_WINDOWS_RUNTIME)
+typedef class null_reactor reactor;
+#elif defined(ASIO_HAS_IOCP)
+typedef class select_reactor reactor;
+#elif defined(ASIO_HAS_EPOLL)
+typedef class epoll_reactor reactor;
+#elif defined(ASIO_HAS_KQUEUE)
+typedef class kqueue_reactor reactor;
+#elif defined(ASIO_HAS_DEV_POLL)
+typedef class dev_poll_reactor reactor;
+#else
+typedef class select_reactor reactor;
+#endif
+
+} // namespace detail
+} // namespace asio
+
+#endif // ASIO_DETAIL_REACTOR_FWD_HPP

asio/include/asio/detail/reactor_op.hpp

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+//
+// detail/reactor_op.hpp
+// ~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2020 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_HPP
+#define ASIO_DETAIL_REACTOR_OP_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/operation.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class reactor_op
+  : public operation
+{
+public:
+  // The error code to be passed to the completion handler.
+  asio::error_code ec_;
+
+  // The number of bytes transferred, to be passed to the completion handler.
+  std::size_t bytes_transferred_;
+
+  // Status returned by perform function. May be used to decide whether it is
+  // worth performing more operations on the descriptor immediately.
+  enum status { not_done, done, done_and_exhausted };
+
+  // Perform the operation. Returns true if it is finished.
+  status perform()
+  {
+    return perform_func_(this);
+  }
+
+protected:
+  typedef status (*perform_func_type)(reactor_op*);
+
+  reactor_op(const asio::error_code& success_ec,
+      perform_func_type perform_func, func_type complete_func)
+    : operation(complete_func),
+      ec_(success_ec),
+      bytes_transferred_(0),
+      perform_func_(perform_func)
+  {
+  }
+
+private:
+  perform_func_type perform_func_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_REACTOR_OP_HPP

asio/include/asio/detail/reactor_op_queue.hpp

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+//
+// detail/reactor_op_queue.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2020 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