OS/2 port!

This was mostly, if not entirely, written by "Doodle" and "Caetano":
    doodle@scenergy.dfmk.hu
    daniel@caetano.eng.br

--ryan.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401193

src/events/Makefile.wat

@@ -0,0 +1,24 @@
+#=============================================================================
+#          This is a Watcom makefile to build SDL.DLL for OS/2
+#
+# Makefile for events
+#=============================================================================
+
+object_files=SDL_active.obj SDL_events.obj SDL_expose.obj SDL_keyboard.obj SDL_mouse.obj SDL_quit.obj SDL_resize.obj
+ExtraCFlags=-dUSE_DOSSETPRIORITY
+
+#
+#==============================================================================
+#
+!include ..\..\Watcom.mif
+
+.before
+    set include=$(%os2tk)\h;$(%include);../../include;../timer;../joystick;../video;
+
+all : $(object_files)
+
+clean : .SYMBOLIC
+        @if exist *.obj del *.obj
+        @if exist *.map del *.map
+        @if exist *.res del *.res
+        @if exist *.lst del *.lst

src/events/SDL_events.c

@@ -89,9 +89,28 @@ void SDL_Unlock_EventThread(void)
 	}
 }
 
+#ifdef __OS2__
+/*
+ * We'll increase the priority of GobbleEvents thread, so it will process
+ *  events in time for sure! For this, we need the DosSetPriority() API
+ *  from the os2.h include file.
+ */
+#define INCL_DOSPROCESS
+#include <os2.h>
+#include <time.h>
+#endif
+
 static int SDL_GobbleEvents(void *unused)
 {
 	event_thread = SDL_ThreadID();
+
+#ifdef __OS2__
+#ifdef USE_DOSSETPRIORITY
+	/* Increase thread priority, so it will process events in time for sure! */
+	DosSetPriority(PRTYS_THREAD, PRTYC_REGULAR, +16, 0);
+#endif
+#endif
+
 	while ( SDL_EventQ.active ) {
 		SDL_VideoDevice *video = current_video;
 		SDL_VideoDevice *this  = current_video;

src/events/SDL_resize.c

@@ -45,8 +45,11 @@ int SDL_PrivateResize(int w, int h)
 	SDL_Event events[32];
 
 	/* See if this event would change the video surface */
-	if ( !w || !h ||
-	     ((last_resize.w == w) && (last_resize.h == h)) ) {
+	if ( !w || !h
+#ifndef __OS2__
+            || ((last_resize.w == w) && (last_resize.h == h))
+#endif
+    ) {
 		return(0);
 	}
         last_resize.w = w;

src/events/SDL_sysevents.h

@@ -44,3 +44,7 @@ static char rcsid =
 #ifdef macintosh	/* MacOS 7/8 don't support preemptive multi-tasking */
 #define CANT_THREAD_EVENTS
 #endif
+
+#ifdef __OS2__		/* The OS/2 event loop runs in a separate thread */
+#define MUST_THREAD_EVENTS
+#endif