Initial Commit

include/asio/impl/cancellation_signal.ipp

@@ -0,0 +1,96 @@
+//
+// impl/cancellation_signal.ipp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2025 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_IMPL_CANCELLATION_SIGNAL_IPP
+#define ASIO_IMPL_CANCELLATION_SIGNAL_IPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/cancellation_signal.hpp"
+#include "asio/detail/thread_context.hpp"
+#include "asio/detail/thread_info_base.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+
+cancellation_signal::~cancellation_signal()
+{
+  if (handler_)
+  {
+    std::pair<void*, std::size_t> mem = handler_->destroy();
+    detail::thread_info_base::deallocate(
+        detail::thread_info_base::cancellation_signal_tag(),
+        detail::thread_context::top_of_thread_call_stack(),
+        mem.first, mem.second);
+  }
+}
+
+void cancellation_slot::clear()
+{
+  if (handler_ != 0 && *handler_ != 0)
+  {
+    std::pair<void*, std::size_t> mem = (*handler_)->destroy();
+    detail::thread_info_base::deallocate(
+        detail::thread_info_base::cancellation_signal_tag(),
+        detail::thread_context::top_of_thread_call_stack(),
+        mem.first, mem.second);
+    *handler_ = 0;
+  }
+}
+
+std::pair<void*, std::size_t> cancellation_slot::prepare_memory(
+    std::size_t size, std::size_t align)
+{
+  assert(handler_);
+  std::pair<void*, std::size_t> mem;
+  if (*handler_)
+  {
+    mem = (*handler_)->destroy();
+    *handler_ = 0;
+  }
+  if (size > mem.second
+      || reinterpret_cast<std::size_t>(mem.first) % align != 0)
+  {
+    if (mem.first)
+    {
+      detail::thread_info_base::deallocate(
+          detail::thread_info_base::cancellation_signal_tag(),
+          detail::thread_context::top_of_thread_call_stack(),
+          mem.first, mem.second);
+    }
+    mem.first = detail::thread_info_base::allocate(
+        detail::thread_info_base::cancellation_signal_tag(),
+        detail::thread_context::top_of_thread_call_stack(),
+        size, align);
+    mem.second = size;
+  }
+  return mem;
+}
+
+cancellation_slot::auto_delete_helper::~auto_delete_helper()
+{
+  if (mem.first)
+  {
+    detail::thread_info_base::deallocate(
+        detail::thread_info_base::cancellation_signal_tag(),
+        detail::thread_context::top_of_thread_call_stack(),
+        mem.first, mem.second);
+  }
+}
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IMPL_CANCELLATION_SIGNAL_IPP