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/*
* 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);
}
}
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