- revamp priority changing on windows, add cvar i_allowprioritychange to disallow priority changing entirely, allowing batch scripts to dictate GZDoom's process priority

Author: madame-rachelle

src/common/platform/win32/i_input.cpp

@@ -128,6 +128,7 @@ EXTERN_CVAR(Bool, i_pauseinbackground);
 
 
 CVAR (Bool, k_allowfullscreentoggle, true, CVAR_ARCHIVE|CVAR_GLOBALCONFIG)
+CVAR (Bool, i_allowprioritychange, true, CVAR_ARCHIVE|CVAR_GLOBALCONFIG)
 
 static void I_CheckGUICapture ()
 {
@@ -485,13 +486,16 @@ LRESULT CALLBACK WndProc (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 
 	case WM_ACTIVATEAPP:
 		AppActive = (wParam == TRUE);
-		if (wParam || !i_pauseinbackground)
+		if (!i_pauseinbackground && i_allowprioritychange)
 		{
-			SetPriorityClass (GetCurrentProcess (), INGAME_PRIORITY_CLASS);
-		}
-		else if (!noidle && !(sysCallbacks.NetGame && sysCallbacks.NetGame()))
-		{
-			SetPriorityClass (GetCurrentProcess (), IDLE_PRIORITY_CLASS);
+			if (wParam)
+			{
+				SetPriorityClass (GetCurrentProcess (), INGAME_PRIORITY_CLASS);
+			}
+			else if (!noidle && !(sysCallbacks.NetGame && sysCallbacks.NetGame()))
+			{
+				SetPriorityClass (GetCurrentProcess (), IDLE_PRIORITY_CLASS);
+			}
 		}
 		S_SetSoundPaused (wParam);
 		break;

src/common/platform/win32/i_system.cpp

@@ -244,6 +244,9 @@ void CalculateCPUSpeed()
         // probably never use the performance statistics.
         min_diff = freq.LowPart * 11 / 200;
 
+		// just in case we were launched with a custom priority class, keep it
+		DWORD OldPriorityClass = GetPriorityClass(GetCurrentProcess());
+
 		// Minimize the chance of task switching during the testing by going very
 		// high priority. This is another reason to avoid timing for too long.
 		SetPriorityClass(GetCurrentProcess(), REALTIME_PRIORITY_CLASS);
@@ -258,7 +261,7 @@ void CalculateCPUSpeed()
 		do { QueryPerformanceCounter(&count1); } while ((count1.QuadPart - count2.QuadPart) < min_diff);
 		ClockCalibration.Unclock();
 
-		SetPriorityClass(GetCurrentProcess(), NORMAL_PRIORITY_CLASS);
+		SetPriorityClass(GetCurrentProcess(), OldPriorityClass);
 		SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_NORMAL);
 
 		PerfToSec = double(count1.QuadPart - count2.QuadPart) / (double(ClockCalibration.GetRawCounter()) * freq.QuadPart);