From c04dcc2e7d834218ef2d4194331e383402495ae1 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 10 Apr 2024 20:07:22 +0200
Subject: Adding upstream version 2:20.4+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 xbmc/windowing/wayland/Signals.h | 151 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 151 insertions(+)
 create mode 100644 xbmc/windowing/wayland/Signals.h

(limited to 'xbmc/windowing/wayland/Signals.h')

diff --git a/xbmc/windowing/wayland/Signals.h b/xbmc/windowing/wayland/Signals.h
new file mode 100644
index 0000000..59a1fdf
--- /dev/null
+++ b/xbmc/windowing/wayland/Signals.h
@@ -0,0 +1,151 @@
+/*
+ *  Copyright (C) 2017-2018 Team Kodi
+ *  This file is part of Kodi - https://kodi.tv
+ *
+ *  SPDX-License-Identifier: GPL-2.0-or-later
+ *  See LICENSES/README.md for more information.
+ */
+
+#pragma once
+
+#include "threads/CriticalSection.h"
+
+#include <map>
+#include <memory>
+#include <mutex>
+
+namespace KODI
+{
+
+using RegistrationIdentifierType = int;
+
+class ISignalHandlerData
+{
+protected:
+  ~ISignalHandlerData() = default;
+
+public:
+  virtual void Unregister(RegistrationIdentifierType id) = 0;
+};
+
+class CSignalRegistration
+{
+  std::weak_ptr<ISignalHandlerData> m_list;
+  RegistrationIdentifierType m_registration;
+
+  template<typename ManagedT>
+  friend class CSignalHandlerList;
+
+  CSignalRegistration(std::shared_ptr<ISignalHandlerData> const& list, RegistrationIdentifierType registration)
+  : m_list{list}, m_registration{registration}
+  {
+  }
+
+  CSignalRegistration(CSignalRegistration const& other) = delete;
+  CSignalRegistration& operator=(CSignalRegistration const& other) = delete;
+
+public:
+  CSignalRegistration() noexcept = default;
+
+  CSignalRegistration(CSignalRegistration&& other) noexcept
+  {
+    *this = std::move(other);
+  }
+
+  inline CSignalRegistration& operator=(CSignalRegistration&& other) noexcept
+  {
+    Unregister();
+    std::swap(m_list, other.m_list);
+    m_registration = other.m_registration;
+    return *this;
+  }
+
+  ~CSignalRegistration() noexcept
+  {
+    Unregister();
+  }
+
+  inline void Unregister()
+  {
+    if (auto list = m_list.lock())
+    {
+      list->Unregister(m_registration);
+      list.reset();
+    }
+  }
+};
+
+template<typename ManagedT>
+class CSignalHandlerList
+{
+  /**
+   * Internal storage for handler list
+   *
+   * Extra struct so memory handling with shared_ptr and weak_ptr can be done
+   * on this level
+   */
+  struct Data final : public ISignalHandlerData
+  {
+    CCriticalSection m_handlerCriticalSection;
+    std::map<RegistrationIdentifierType, ManagedT> m_handlers;
+
+    void Unregister(RegistrationIdentifierType id) override
+    {
+      std::unique_lock<CCriticalSection> lock(m_handlerCriticalSection);
+      m_handlers.erase(id);
+    }
+  };
+
+  std::shared_ptr<Data> m_data;
+  RegistrationIdentifierType m_lastRegistrationId{};
+
+  CSignalHandlerList(CSignalHandlerList const& other) = delete;
+  CSignalHandlerList& operator=(CSignalHandlerList const& other) = delete;
+
+public:
+  CSignalHandlerList()
+  : m_data{new Data}
+  {}
+
+  CSignalRegistration Register(ManagedT const& handler)
+  {
+    std::unique_lock<CCriticalSection> lock(m_data->m_handlerCriticalSection);
+    bool inserted{false};
+    while(!inserted)
+    {
+      inserted = m_data->m_handlers.emplace(++m_lastRegistrationId, handler).second;
+    }
+    return {m_data, m_lastRegistrationId};
+  }
+
+  /**
+   * Invoke all registered signal handlers with the provided arguments
+   * when the signal type is a std::function or otherwise implements
+   * operator()
+   */
+  template<typename... ArgsT>
+  void Invoke(ArgsT&&... args)
+  {
+    std::unique_lock<CCriticalSection> lock(m_data->m_handlerCriticalSection);
+    for (auto const& handler : *this)
+    {
+      handler.second(std::forward<ArgsT>(args)...);
+    }
+  }
+
+  auto begin() const { return m_data->m_handlers.cbegin(); }
+
+  auto end() const { return m_data->m_handlers.cend(); }
+
+  /**
+   * Get critical section for accessing the handler list
+   * \note You must lock this yourself if you iterate through the handler
+   * list manually without using \ref Invoke or similar.
+   */
+  CCriticalSection const& CriticalSection() const
+  {
+    return m_data->m_handlerCriticalSection;
+  }
+};
+
+}
-- 
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