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view src/video/Xext/extensions/xme.h @ 4158:96ce26f24b01 SDL-1.2

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Date: Sun, 7 Sep 2008 15:17:00 +0200 From: c2woody@gmx.net Subject: [SDL] SDL 1.2 doube free/pointer zeroing missing Hello, this is about a crash/debug breakage for the current SDL 1.2 source tree (today's svn checkout, same problem in 1.2.13 and before as far as relevant). In some places memory is free()d but the associated pointer is not zeroed, leading to for example double free()s. For me this happened because SDL_StopEventThread() was executed twice (during restart of the subsystems), once for the close down in SDL_VideoQuit() and once at the startup, right at the beginning of SDL_StartEventLoop(). Thus the code SDL_DestroyMutex(SDL_EventQ.lock); (see SDL_events.c) was called twice and executed the SDL_free(mutex); twice as well, leading to a crash (msvc 64bit for which it was noticed). I've tried to check all other occurrences of SDL_free and similar code in msvc, see the attached patch (udiff against revision 4082). Non-windows only codepaths have neither been checked nor touched. Comments/ideas welcome. Attached patch: NULLifies some pointers after they have been free()d.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 12 Nov 2008 17:23:40 +0000
parents a10bddfdc40f
children
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/*
 * Copyright 1993-2001 by Xi Graphics, Inc.
 * All Rights Reserved.
 *
 * Please see the LICENSE file accompanying this distribution for licensing 
 * information. 
 *
 * Please send any bug fixes and modifications to src@xig.com.
 *
 * $XiGId: xme.h,v 1.1.1.1 2001/11/19 19:01:10 jon Exp $
 *
 */


#ifndef _XME_H_INCLUDED 
#define _XME_H_INCLUDED

typedef struct {        
  short		        x;
  short		        y;
  unsigned short	w;
  unsigned short	h;
} XiGMiscViewInfo;

typedef struct {        
  unsigned short        width;
  unsigned short        height;
  int                   refresh;
} XiGMiscResolutionInfo;

extern Bool XiGMiscQueryVersion(Display *dpy, int *major, int *minor);
extern int XiGMiscQueryViews(Display *dpy, int screen, 
			     XiGMiscViewInfo **pviews);
extern int XiGMiscQueryResolutions(Display *dpy, int screen, int view, 
			    int *pactive, 
			    XiGMiscResolutionInfo **presolutions);
extern void XiGMiscChangeResolution(Display *dpy, int screen, int view, 
			     int width, int height, int refresh);

/* SDL addition from Ryan: free memory used by xme. */
extern void XiGMiscDestroy(void);

#endif /* _XME_H_INCLUDED */