Make reference counter atomic

Author: xezon

Core/Libraries/Source/WWVegas/WWLib/DbgHelpLoader.cpp

@@ -67,14 +67,15 @@ bool DbgHelpLoader::load()
 		Inst = new (p) DbgHelpLoader();
 	}
 
-	++Inst->m_referenceCount;
+	// Always increment the reference count.
+	const long referenceCount = InterlockedIncrement(&Inst->m_referenceCount);
 
 	// Optimization: return early if it failed before.
 	if (Inst->m_failed)
 		return false;
 
 	// Return early if someone else already loaded it.
-	if (Inst->m_referenceCount > 1)
+	if (referenceCount > 1)
 		return true;
 
 	// Try load dbghelp.dll from the system directory first.
@@ -124,7 +125,7 @@ void DbgHelpLoader::unload()
 	if (Inst == NULL)
 		return;
 
-	if (--Inst->m_referenceCount != 0)
+	if (InterlockedDecrement(&Inst->m_referenceCount) != 0)
 		return;
 
 	freeResources();

Core/Libraries/Source/WWVegas/WWLib/DbgHelpLoader.h

@@ -180,7 +180,7 @@ class DbgHelpLoader
 
 	Processes m_initializedProcesses;
 	HMODULE m_dllModule;
-	int m_referenceCount;
+	Interlocked32 m_referenceCount;
 	bool m_failed;
 	bool m_loadedFromSystem;
 };

Core/Libraries/Source/WWVegas/WWLib/WWCommon.h

@@ -38,6 +38,8 @@ enum
 
 #if defined(_MSC_VER) && _MSC_VER < 1300
 typedef unsigned MemValueType;
+typedef long Interlocked32;
 #else
 typedef unsigned long long MemValueType;
+typedef volatile long Interlocked32;
 #endif