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Code Issues Releases Wiki Activity

RecycleManager.dll: Improved threading code to avoid potential block on refresh

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This commit is contained in:
Birunthan Mohanathas 2012-06-28 11:29:54 +03:00
parent 77ed9e7c92
commit 8a58cb682c
1 changed files with 62 additions and 8 deletions
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70
Plugins/PluginRecycleManager/RecycleManager.cpp
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@ -25,7 +25,6 @@
#include <vector>
#include "../../Library/RawString.h"
#include "../../Library/Export.h" // Rainmeter's exported functions
#include "../../Library/DisableThreadLibraryCalls.h" // contains DllMain entry point
struct MeasureData
{
@ -60,7 +59,28 @@ bool g_IsXP = false;
int g_UpdateCount = 0;
int g_InstanceCount = 0;
HANDLE g_Thread = NULL;
bool g_Thread = false;
bool g_FreeInstanceInThread = false;
CRITICAL_SECTION g_CriticalSection;
BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
{
switch (fdwReason)
{
case DLL_PROCESS_ATTACH:
InitializeCriticalSection(&g_CriticalSection);
// Disable DLL_THREAD_ATTACH and DLL_THREAD_DETACH notification calls
DisableThreadLibraryCalls(hinstDLL);
break;
case DLL_PROCESS_DETACH:
DeleteCriticalSection(&g_CriticalSection);
break;
}
return TRUE;
}
PLUGIN_EXPORT void Initialize(void** data, void* rm)
{
@ -109,7 +129,8 @@ PLUGIN_EXPORT double Update(void* data)
MeasureData* measure = (MeasureData*)data;
++g_UpdateCount;
if (g_UpdateCount > g_InstanceCount && !g_Thread)
if (g_UpdateCount > g_InstanceCount &&
TryEnterCriticalSection(&g_CriticalSection))
{
g_UpdateCount = 0;
@ -218,13 +239,20 @@ PLUGIN_EXPORT double Update(void* data)
}
}
if (changed)
if (changed && !g_Thread)
{
g_UpdateCount = -8;
g_Thread = (HANDLE)_beginthreadex(NULL, 0, QueryRecycleBinThreadProc, NULL, 0, NULL);
HANDLE thread = (HANDLE)_beginthreadex(NULL, 0, QueryRecycleBinThreadProc, NULL, 0, NULL);
if (thread)
{
CloseHandle(thread);
g_Thread = true;
}
}
LeaveCriticalSection(&g_CriticalSection);
}
return measure->count ? g_BinCount : g_BinSize;
}
@ -236,7 +264,17 @@ PLUGIN_EXPORT void Finalize(void* data)
--g_InstanceCount;
if (g_InstanceCount == 0)
{
WaitForSingleObject(g_Thread, INFINITE);
EnterCriticalSection(&g_CriticalSection);
if (g_Thread && !g_FreeInstanceInThread)
{
// Increment ref count of this module so that it will not be unloaded prior to
// thread completion.
DWORD flags = GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS;
HMODULE module;
GetModuleHandleEx(flags, (LPCWSTR)DllMain, &module);
g_FreeInstanceInThread = true;
}
LeaveCriticalSection(&g_CriticalSection);
}
}
@ -266,8 +304,24 @@ unsigned int __stdcall QueryRecycleBinThreadProc(void* pParam)
g_BinCount = (double)rbi.i64NumItems;
g_BinSize = (double)rbi.i64Size;
CloseHandle(g_Thread);
g_Thread = NULL;
EnterCriticalSection(&g_CriticalSection);
HMODULE module = NULL;
if (g_FreeInstanceInThread)
{
DWORD flags = GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS | GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT;
GetModuleHandleEx(flags, (LPCWSTR)DllMain, &module);
g_FreeInstanceInThread = false;
}
g_Thread = false;
LeaveCriticalSection(&g_CriticalSection);
if (module)
{
// Decrement the ref count and possibly unload the module if this is
// the last instance.
FreeLibraryAndExitThread(module, 0);
}
return 0;
}