summaryrefslogtreecommitdiffstatshomepage
path: root/3rdparty/asio/src/tests/performance/handler_allocator.hpp
diff options
context:
space:
mode:
Diffstat (limited to '3rdparty/asio/src/tests/performance/handler_allocator.hpp')
-rw-r--r--3rdparty/asio/src/tests/performance/handler_allocator.hpp112
1 files changed, 112 insertions, 0 deletions
diff --git a/3rdparty/asio/src/tests/performance/handler_allocator.hpp b/3rdparty/asio/src/tests/performance/handler_allocator.hpp
new file mode 100644
index 00000000000..6c1b98532ab
--- /dev/null
+++ b/3rdparty/asio/src/tests/performance/handler_allocator.hpp
@@ -0,0 +1,112 @@
+//
+// handler_allocator.cpp
+// ~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2024 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 HANDLER_ALLOCATOR_HPP
+#define HANDLER_ALLOCATOR_HPP
+
+#include "asio.hpp"
+#include <boost/aligned_storage.hpp>
+#include <boost/noncopyable.hpp>
+
+// 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_allocator
+ : private boost::noncopyable
+{
+public:
+ handler_allocator()
+ : in_use_(false)
+ {
+ }
+
+ void* allocate(std::size_t size)
+ {
+ if (!in_use_ && size < storage_.size)
+ {
+ in_use_ = true;
+ return storage_.address();
+ }
+
+ 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_;
+};
+
+// Wrapper class template for handler objects to allow handler memory
+// allocation to be customised. Calls to operator() are forwarded to the
+// encapsulated handler.
+template <typename Handler>
+class custom_alloc_handler
+{
+public:
+ custom_alloc_handler(handler_allocator& a, Handler h)
+ : allocator_(a),
+ handler_(h)
+ {
+ }
+
+ template <typename Arg1>
+ void operator()(Arg1 arg1)
+ {
+ handler_(arg1);
+ }
+
+ template <typename Arg1, typename Arg2>
+ void operator()(Arg1 arg1, Arg2 arg2)
+ {
+ handler_(arg1, arg2);
+ }
+
+ friend void* asio_handler_allocate(std::size_t size,
+ custom_alloc_handler<Handler>* this_handler)
+ {
+ return this_handler->allocator_.allocate(size);
+ }
+
+ friend void asio_handler_deallocate(void* pointer, std::size_t /*size*/,
+ custom_alloc_handler<Handler>* this_handler)
+ {
+ this_handler->allocator_.deallocate(pointer);
+ }
+
+private:
+ handler_allocator& allocator_;
+ 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_allocator& a, Handler h)
+{
+ return custom_alloc_handler<Handler>(a, h);
+}
+
+#endif // HANDLER_ALLOCATOR_HPP