summaryrefslogtreecommitdiffstatshomepage
path: root/3rdparty/asio/src/examples/cpp03/allocation/server.cpp
diff options
context:
space:
mode:
Diffstat (limited to '3rdparty/asio/src/examples/cpp03/allocation/server.cpp')
-rw-r--r--3rdparty/asio/src/examples/cpp03/allocation/server.cpp285
1 files changed, 285 insertions, 0 deletions
diff --git a/3rdparty/asio/src/examples/cpp03/allocation/server.cpp b/3rdparty/asio/src/examples/cpp03/allocation/server.cpp
new file mode 100644
index 00000000000..ca69460ff14
--- /dev/null
+++ b/3rdparty/asio/src/examples/cpp03/allocation/server.cpp
@@ -0,0 +1,285 @@
+//
+// server.cpp
+// ~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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)
+//
+
+#include <cstdlib>
+#include <iostream>
+#include <boost/aligned_storage.hpp>
+#include <boost/array.hpp>
+#include <boost/bind/bind.hpp>
+#include <boost/enable_shared_from_this.hpp>
+#include <boost/noncopyable.hpp>
+#include <boost/shared_ptr.hpp>
+#include "asio.hpp"
+
+using asio::ip::tcp;
+
+// Class to manage the memory to be used for handler-based custom allocation.
+// It contains a single block of memory which may be returned for allocation
+// requests. If the memory is in use when an allocation request is made, the
+// allocator delegates allocation to the global heap.
+class handler_memory
+ : private boost::noncopyable
+{
+public:
+ handler_memory()
+ : in_use_(false)
+ {
+ }
+
+ void* allocate(std::size_t size)
+ {
+ if (!in_use_ && size < storage_.size)
+ {
+ in_use_ = true;
+ return storage_.address();
+ }
+ else
+ {
+ return ::operator new(size);
+ }
+ }
+
+ void deallocate(void* pointer)
+ {
+ if (pointer == storage_.address())
+ {
+ in_use_ = false;
+ }
+ else
+ {
+ ::operator delete(pointer);
+ }
+ }
+
+private:
+ // Storage space used for handler-based custom memory allocation.
+ boost::aligned_storage<1024> storage_;
+
+ // Whether the handler-based custom allocation storage has been used.
+ bool in_use_;
+};
+
+// The allocator to be associated with the handler objects. This allocator only
+// needs to satisfy the C++11 minimal allocator requirements, plus rebind when
+// targeting C++03.
+template <typename T>
+class handler_allocator
+{
+public:
+ typedef T value_type;
+
+ explicit handler_allocator(handler_memory& mem)
+ : memory_(mem)
+ {
+ }
+
+ template <typename U>
+ handler_allocator(const handler_allocator<U>& other)
+ : memory_(other.memory_)
+ {
+ }
+
+ template <typename U>
+ struct rebind
+ {
+ typedef handler_allocator<U> other;
+ };
+
+ bool operator==(const handler_allocator& other) const
+ {
+ return &memory_ == &other.memory_;
+ }
+
+ bool operator!=(const handler_allocator& other) const
+ {
+ return &memory_ != &other.memory_;
+ }
+
+ T* allocate(std::size_t n) const
+ {
+ return static_cast<T*>(memory_.allocate(sizeof(T) * n));
+ }
+
+ void deallocate(T* p, std::size_t /*n*/) const
+ {
+ return memory_.deallocate(p);
+ }
+
+//private:
+ // The underlying memory.
+ handler_memory& memory_;
+};
+
+// Wrapper class template for handler objects to allow handler memory
+// allocation to be customised. The allocator_type typedef and get_allocator()
+// member function are used by the asynchronous operations to obtain the
+// allocator. Calls to operator() are forwarded to the encapsulated handler.
+template <typename Handler>
+class custom_alloc_handler
+{
+public:
+ typedef handler_allocator<Handler> allocator_type;
+
+ custom_alloc_handler(handler_memory& m, Handler h)
+ : memory_(m),
+ handler_(h)
+ {
+ }
+
+ allocator_type get_allocator() const
+ {
+ return allocator_type(memory_);
+ }
+
+ template <typename Arg1>
+ void operator()(Arg1 arg1)
+ {
+ handler_(arg1);
+ }
+
+ template <typename Arg1, typename Arg2>
+ void operator()(Arg1 arg1, Arg2 arg2)
+ {
+ handler_(arg1, arg2);
+ }
+
+private:
+ handler_memory& memory_;
+ Handler handler_;
+};
+
+// Helper function to wrap a handler object to add custom allocation.
+template <typename Handler>
+inline custom_alloc_handler<Handler> make_custom_alloc_handler(
+ handler_memory& m, Handler h)
+{
+ return custom_alloc_handler<Handler>(m, h);
+}
+
+class session
+ : public boost::enable_shared_from_this<session>
+{
+public:
+ session(asio::io_context& io_context)
+ : socket_(io_context)
+ {
+ }
+
+ tcp::socket& socket()
+ {
+ return socket_;
+ }
+
+ void start()
+ {
+ socket_.async_read_some(asio::buffer(data_),
+ make_custom_alloc_handler(handler_memory_,
+ boost::bind(&session::handle_read,
+ shared_from_this(),
+ asio::placeholders::error,
+ asio::placeholders::bytes_transferred)));
+ }
+
+ void handle_read(const asio::error_code& error,
+ size_t bytes_transferred)
+ {
+ if (!error)
+ {
+ asio::async_write(socket_,
+ asio::buffer(data_, bytes_transferred),
+ make_custom_alloc_handler(handler_memory_,
+ boost::bind(&session::handle_write,
+ shared_from_this(),
+ asio::placeholders::error)));
+ }
+ }
+
+ void handle_write(const asio::error_code& error)
+ {
+ if (!error)
+ {
+ socket_.async_read_some(asio::buffer(data_),
+ make_custom_alloc_handler(handler_memory_,
+ boost::bind(&session::handle_read,
+ shared_from_this(),
+ asio::placeholders::error,
+ asio::placeholders::bytes_transferred)));
+ }
+ }
+
+private:
+ // The socket used to communicate with the client.
+ tcp::socket socket_;
+
+ // Buffer used to store data received from the client.
+ boost::array<char, 1024> data_;
+
+ // The memory to use for handler-based custom memory allocation.
+ handler_memory handler_memory_;
+};
+
+typedef boost::shared_ptr<session> session_ptr;
+
+class server
+{
+public:
+ server(asio::io_context& io_context, short port)
+ : io_context_(io_context),
+ acceptor_(io_context, tcp::endpoint(tcp::v4(), port))
+ {
+ session_ptr new_session(new session(io_context_));
+ acceptor_.async_accept(new_session->socket(),
+ boost::bind(&server::handle_accept, this, new_session,
+ asio::placeholders::error));
+ }
+
+ void handle_accept(session_ptr new_session,
+ const asio::error_code& error)
+ {
+ if (!error)
+ {
+ new_session->start();
+ }
+
+ new_session.reset(new session(io_context_));
+ acceptor_.async_accept(new_session->socket(),
+ boost::bind(&server::handle_accept, this, new_session,
+ asio::placeholders::error));
+ }
+
+private:
+ asio::io_context& io_context_;
+ tcp::acceptor acceptor_;
+};
+
+int main(int argc, char* argv[])
+{
+ try
+ {
+ if (argc != 2)
+ {
+ std::cerr << "Usage: server <port>\n";
+ return 1;
+ }
+
+ asio::io_context io_context;
+
+ using namespace std; // For atoi.
+ server s(io_context, atoi(argv[1]));
+
+ io_context.run();
+ }
+ catch (std::exception& e)
+ {
+ std::cerr << "Exception: " << e.what() << "\n";
+ }
+
+ return 0;
+}