/* $XFree86: xc/lib/GL/mesa/src/drv/radeon/radeon_lock.h,v 1.3 2002/10/30 12:51:55 alanh Exp $ */
/**************************************************************************

Copyright 2000, 2001 ATI Technologies Inc., Ontario, Canada, and
                     VA Linux Systems Inc., Fremont, California.

All Rights Reserved.

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a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
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the following conditions:

The above copyright notice and this permission notice (including the
next paragraph) shall be included in all copies or substantial
portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
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**************************************************************************/

/*
 * Authors:
 *   Kevin E. Martin <martin@valinux.com>
 *   Gareth Hughes <gareth@valinux.com>
 */

#ifndef __RADEON_LOCK_H__
#define __RADEON_LOCK_H__

#ifdef GLX_DIRECT_RENDERING

extern void radeonGetLock( radeonContextPtr rmesa, GLuint flags );

/* Turn DEBUG_LOCKING on to find locking conflicts.
 */
#define DEBUG_LOCKING	0

#if DEBUG_LOCKING
extern char *prevLockFile;
extern int prevLockLine;

#define DEBUG_LOCK()							\
   do {									\
      prevLockFile = (__FILE__);					\
      prevLockLine = (__LINE__);					\
   } while (0)

#define DEBUG_RESET()							\
   do {									\
      prevLockFile = 0;							\
      prevLockLine = 0;							\
   } while (0)

#define DEBUG_CHECK_LOCK()						\
   do {									\
      if ( prevLockFile ) {						\
	 fprintf( stderr,						\
		  "LOCK SET!\n\tPrevious %s:%d\n\tCurrent: %s:%d\n",	\
		  prevLockFile, prevLockLine, __FILE__, __LINE__ );	\
	 exit( 1 );							\
      }									\
   } while (0)

#else

#define DEBUG_LOCK()
#define DEBUG_RESET()
#define DEBUG_CHECK_LOCK()

#endif

/*
 * !!! We may want to separate locks from locks with validation.  This
 * could be used to improve performance for those things commands that
 * do not do any drawing !!!
 */


/* Lock the hardware and validate our state.
 */
#define LOCK_HARDWARE( rmesa )					\
   do {								\
      char __ret = 0;						\
      DEBUG_CHECK_LOCK();					\
      DRM_CAS( rmesa->dri.hwLock, rmesa->dri.hwContext,		\
	       (DRM_LOCK_HELD | rmesa->dri.hwContext), __ret );	\
      if ( __ret )						\
	 radeonGetLock( rmesa, 0 );				\
      DEBUG_LOCK();						\
   } while (0)

/* Unlock the hardware.
 */
#define UNLOCK_HARDWARE( rmesa )					\
   do {									\
      DRM_UNLOCK( rmesa->dri.fd,					\
		  rmesa->dri.hwLock,					\
		  rmesa->dri.hwContext );				\
      DEBUG_RESET();							\
   } while (0)

#endif
#endif /* __RADEON_LOCK_H__ */
