From b052d69633128fd9e9f767df86e10674e060fc38 Mon Sep 17 00:00:00 2001
From: Peter Veenstra <qbix79@users.sourceforge.net>
Date: Sat, 2 Oct 2004 11:31:47 +0000
Subject: [PATCH] Changed priority under linux. Only do it when as root or both
 priorties are the same. Set Priority on startup as well. Reversed scale and
 use it on all threads under non-w32. Moved SDL_Quit to another location to
 prevent some sdl exceptions

Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2012
---
 src/gui/sdlmain.cpp | 28 ++++++++++++++++++++--------
 1 file changed, 20 insertions(+), 8 deletions(-)

diff --git a/src/gui/sdlmain.cpp b/src/gui/sdlmain.cpp
index 137f7306..fe478638 100644
--- a/src/gui/sdlmain.cpp
+++ b/src/gui/sdlmain.cpp
@@ -16,7 +16,7 @@
  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */
 
-/* $Id: sdlmain.cpp,v 1.79 2004-09-29 19:14:10 harekiet Exp $ */
+/* $Id: sdlmain.cpp,v 1.80 2004-10-02 11:31:47 qbix79 Exp $ */
 
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
@@ -27,6 +27,7 @@
 #include <stdio.h>
 #include <unistd.h>
 #include <stdarg.h>
+#include <sys/types.h>
 
 #include "SDL.h"
 
@@ -690,7 +691,6 @@ static void GUI_ShutDown(Section * sec) {
 	GFX_Stop();
 	if (sdl.mouse.locked) CaptureMouse();
 	if (sdl.desktop.fullscreen) SwitchFullScreen();
-	SDL_Quit();   //Becareful this should be removed if on the fly renderchanges are allowed
 }
 
 static void KillSwitch(void){
@@ -698,6 +698,15 @@ static void KillSwitch(void){
 }
 
 static void SetPriority(PRIORITY_LEVELS level) {
+
+#if C_SET_PRIORITY
+// Do nothing if priorties are not the same and not root, else the highest 
+// priority can not be set as users can only lower priority (not restore it)
+
+	if((sdl.priority.focus != sdl.priority.nofocus ) && 
+		(getuid()!=0) ) return;
+
+#endif
 	switch (level) {
 #ifdef WIN32
 	case PRIORITY_LEVEL_LOWER:
@@ -713,17 +722,18 @@ static void SetPriority(PRIORITY_LEVELS level) {
 		SetPriorityClass(GetCurrentProcess(),HIGH_PRIORITY_CLASS);
 		break;
 #elif C_SET_PRIORITY
+/* Linux use group as dosbox has mulitple threads under linux */
 	case PRIORITY_LEVEL_LOWER:
-		setpriority (PRIO_PROCESS, 0,PRIO_MIN+(PRIO_TOTAL/3));
+		setpriority (PRIO_PGRP, 0,PRIO_MAX-(PRIO_TOTAL/3));
 		break;
 	case PRIORITY_LEVEL_NORMAL:
-		setpriority (PRIO_PROCESS, 0,PRIO_MIN+(PRIO_TOTAL/2));
+		setpriority (PRIO_PGRP, 0,PRIO_MAX-(PRIO_TOTAL/2));
 		break;
 	case PRIORITY_LEVEL_HIGHER:
-		setpriority (PRIO_PROCESS, 0,PRIO_MIN+((3*PRIO_TOTAL)/5) );
+		setpriority (PRIO_PGRP, 0,PRIO_MAX-((3*PRIO_TOTAL)/5) );
 		break;
 	case PRIORITY_LEVEL_HIGHEST:
-		setpriority (PRIO_PROCESS, 0,PRIO_MIN+((3*PRIO_TOTAL)/4) );
+		setpriority (PRIO_PGRP, 0,PRIO_MAX-((3*PRIO_TOTAL)/4) );
 		break;
 #endif
 	default:
@@ -771,6 +781,7 @@ static void GUI_StartUp(Section * sec) {
 		sdl.priority.focus=PRIORITY_LEVEL_HIGHER;
 		sdl.priority.nofocus=PRIORITY_LEVEL_NORMAL;
 	}
+	SetPriority(sdl.priority.focus); //Assume focus on startup
 	sdl.mouse.locked=false;
 	mouselocked=false; //Global for mapper
 	sdl.mouse.requestlock=false;
@@ -1124,8 +1135,9 @@ int main(int argc, char* argv[]) {
 	catch (int){ 
 		;//nothing pressed killswitch
 	}
-	catch(...){   
-		throw;//dunno what happened. rethrow for sdl to catch
+	catch(...){
+		throw;//dunno what happened. rethrow for sdl to catch 
 	}
+	SDL_Quit();//Let's hope sdl will quit as well when it catches an exception
 	return 0;
 };