1 files changed, 130 insertions, 0 deletions
diff --git a/xbmc/SectionLoader.cpp b/xbmc/SectionLoader.cpp
new file mode 100644
index 0000000..5612512
--- /dev/null
+++ b/xbmc/SectionLoader.cpp
@@ -0,0 +1,130 @@
+/*
+ *  Copyright (C) 2005-2018 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.
+ */
+
+#include "SectionLoader.h"
+
+#include "cores/DllLoader/DllLoaderContainer.h"
+#include "utils/GlobalsHandling.h"
+#include "utils/StringUtils.h"
+#include "utils/log.h"
+
+#include <mutex>
+
+#define g_sectionLoader XBMC_GLOBAL_USE(CSectionLoader)
+
+//  delay for unloading dll's
+#define UNLOAD_DELAY 30*1000 // 30 sec.
+
+//Define this to get logging on all calls to load/unload sections/dlls
+//#define LOGALL
+
+CSectionLoader::CSectionLoader(void) = default;
+
+CSectionLoader::~CSectionLoader(void)
+{
+  UnloadAll();
+}
+
+LibraryLoader *CSectionLoader::LoadDLL(const std::string &dllname, bool bDelayUnload /*=true*/, bool bLoadSymbols /*=false*/)
+{
+  std::unique_lock<CCriticalSection> lock(g_sectionLoader.m_critSection);
+
+  if (dllname.empty()) return NULL;
+  // check if it's already loaded, and increase the reference count if so
+  for (int i = 0; i < (int)g_sectionLoader.m_vecLoadedDLLs.size(); ++i)
+  {
+    CDll& dll = g_sectionLoader.m_vecLoadedDLLs[i];
+    if (StringUtils::EqualsNoCase(dll.m_strDllName, dllname))
+    {
+      dll.m_lReferenceCount++;
+      return dll.m_pDll;
+    }
+  }
+
+  // ok, now load the dll
+  CLog::Log(LOGDEBUG, "SECTION:LoadDLL({})", dllname);
+  LibraryLoader* pDll = DllLoaderContainer::LoadModule(dllname.c_str(), NULL, bLoadSymbols);
+  if (!pDll)
+    return NULL;
+
+  CDll newDLL;
+  newDLL.m_strDllName = dllname;
+  newDLL.m_lReferenceCount = 1;
+  newDLL.m_bDelayUnload=bDelayUnload;
+  newDLL.m_pDll=pDll;
+  g_sectionLoader.m_vecLoadedDLLs.push_back(newDLL);
+
+  return newDLL.m_pDll;
+}
+
+void CSectionLoader::UnloadDLL(const std::string &dllname)
+{
+  std::unique_lock<CCriticalSection> lock(g_sectionLoader.m_critSection);
+
+  if (dllname.empty()) return;
+  // check if it's already loaded, and decrease the reference count if so
+  for (int i = 0; i < (int)g_sectionLoader.m_vecLoadedDLLs.size(); ++i)
+  {
+    CDll& dll = g_sectionLoader.m_vecLoadedDLLs[i];
+    if (StringUtils::EqualsNoCase(dll.m_strDllName, dllname))
+    {
+      dll.m_lReferenceCount--;
+      if (0 == dll.m_lReferenceCount)
+      {
+        if (dll.m_bDelayUnload)
+          dll.m_unloadDelayStartTick = std::chrono::steady_clock::now();
+        else
+        {
+          CLog::Log(LOGDEBUG, "SECTION:UnloadDll({})", dllname);
+          if (dll.m_pDll)
+            DllLoaderContainer::ReleaseModule(dll.m_pDll);
+          g_sectionLoader.m_vecLoadedDLLs.erase(g_sectionLoader.m_vecLoadedDLLs.begin() + i);
+        }
+
+        return;
+      }
+    }
+  }
+}
+
+void CSectionLoader::UnloadDelayed()
+{
+  std::unique_lock<CCriticalSection> lock(g_sectionLoader.m_critSection);
+
+  // check if we can unload any unreferenced dlls
+  for (int i = 0; i < (int)g_sectionLoader.m_vecLoadedDLLs.size(); ++i)
+  {
+    CDll& dll = g_sectionLoader.m_vecLoadedDLLs[i];
+    auto now = std::chrono::steady_clock::now();
+    auto duration =
+        std::chrono::duration_cast<std::chrono::milliseconds>(now - dll.m_unloadDelayStartTick);
+    if (dll.m_lReferenceCount == 0 && duration.count() > UNLOAD_DELAY)
+    {
+      CLog::Log(LOGDEBUG, "SECTION:UnloadDelayed(DLL: {})", dll.m_strDllName);
+
+      if (dll.m_pDll)
+        DllLoaderContainer::ReleaseModule(dll.m_pDll);
+      g_sectionLoader.m_vecLoadedDLLs.erase(g_sectionLoader.m_vecLoadedDLLs.begin() + i);
+      return;
+    }
+  }
+}
+
+void CSectionLoader::UnloadAll()
+{
+  // delete the dll's
+  std::unique_lock<CCriticalSection> lock(g_sectionLoader.m_critSection);
+  std::vector<CDll>::iterator it = g_sectionLoader.m_vecLoadedDLLs.begin();
+  while (it != g_sectionLoader.m_vecLoadedDLLs.end())
+  {
+    CDll& dll = *it;
+    if (dll.m_pDll)
+      DllLoaderContainer::ReleaseModule(dll.m_pDll);
+    it = g_sectionLoader.m_vecLoadedDLLs.erase(it);
+  }
+}